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mbed TLS ChangeLog (Sorted per branch, date)
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= mbed TLS 2.3.x branch released 2016-xx-xx

Features
   * Added hardware entropy selftest to verify that the hardware entropy source
     is functioning correctly.
   * Added a script to print build environment info for diagnostic use in test
     scripts, which is also now called by all.sh.

Bugfix
   * Fix for platform time abstraction to avoid dependency issues where a build
     may need time but not the standard C library abstraction, and added
     configuration consistency checks to check_config.h
   * Fix dependency issue in Makefile to allow parallel builds.
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   * Fix incorrect handling of block lengths in crypt_and_hash sample program,
     when GCM is used. #441
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   * Fix for key exchanges based on ECDH-RSA or ECDH-ECDSA which weren't
     enabled unless others were also present. Found by David Fernandez. #428
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Changes
   * Extended test coverage of special cases, and added new timing test suite.
   * Removed self-tests from the basic-built-test.sh script, and added all
     missing self-tests to the test suites, to ensure self-tests are only
     executed once.
   * Added support for 3 and 4 byte lengths to mbedtls_asn1_write_len().
   * Added support for a Yotta specific configuration file -
     through the symbol YOTTA_CFG_MBEDTLS_TARGET_CONFIG_FILE.
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   * Added optimization for code space for X.509/OID based on configured
     features. (contributed by Aviv Palivoda)
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= mbed TLS 2.3.0 branch released 2016-06-28
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Security
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   * Fix missing padding length check in mbedtls_rsa_rsaes_pkcs1_v15_decrypt
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     required by PKCS1 v2.2
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   * Fix potential integer overflow to buffer overflow in
     mbedtls_rsa_rsaes_pkcs1_v15_encrypt and mbedtls_rsa_rsaes_oaep_encrypt
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     (not triggerable remotely in (D)TLS).
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   * Fix a potential integer underflow to buffer overread in 
Janos Follath's avatar
Janos Follath committed
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     mbedtls_rsa_rsaes_oaep_decrypt. It is not triggerable remotely in
     SSL/TLS.
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Features
   * Support for platform abstraction of the standard C library time()
     function.

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Bugfix
   * Fix bug in mbedtls_mpi_add_mpi() that caused wrong results when the three
     arguments where the same (in-place doubling). Found and fixed by Janos
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     Follath. #309
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   * Fix potential build failures related to the 'apidoc' target, introduced
     in the previous patch release. Found by Robert Scheck. #390 #391
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   * Fix issue in Makefile that prevented building using armar. #386
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   * Fix memory leak that occured only when ECJPAKE was enabled and ECDHE and
     ECDSA was disabled in config.h . The leak didn't occur by default.
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   * Fix an issue that caused valid certificates to be rejected whenever an
     expired or not yet valid certificate was parsed before a valid certificate
     in the trusted certificate list.
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   * Fix bug in mbedtls_x509_crt_parse that caused trailing extra data in the 
     buffer after DER certificates to be included in the raw representation.
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   * Fix issue that caused a hang when generating RSA keys of odd bitlength
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   * Fix bug in mbedtls_rsa_rsaes_pkcs1_v15_encrypt that made null pointer
     dereference possible.
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   * Fix issue that caused a crash if invalid curves were passed to
     mbedtls_ssl_conf_curves. #373
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   * Fix issue in ssl_fork_server which was preventing it from functioning. #429
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   * Fix memory leaks in test framework
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   * Fix test in ssl-opt.sh that does not run properly with valgrind
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   * Fix unchecked calls to mmbedtls_md_setup(). Fix by Brian Murray. #502
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Changes
   * On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5,
     don't use the optimized assembly for bignum multiplication. This removes
     the need to pass -fomit-frame-pointer to avoid a build error with -O0.
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   * Disabled SSLv3 in the default configuration.
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   * Optimized mbedtls_mpi_zeroize() for MPI integer size. (Fix by Alexey
     Skalozub).
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   * Fix non-compliance server extension handling. Extensions for SSLv3 are now
     ignored, as required by RFC6101.
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= mbed TLS 2.2.1 released 2016-01-05
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Security
   * Fix potential double free when mbedtls_asn1_store_named_data() fails to
     allocate memory. Only used for certificate generation, not triggerable
     remotely in SSL/TLS. Found by Rafał Przywara. #367
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   * Disable MD5 handshake signatures in TLS 1.2 by default to prevent the
     SLOTH attack on TLS 1.2 server authentication (other attacks from the
     SLOTH paper do not apply to any version of mbed TLS or PolarSSL).
     https://www.mitls.org/pages/attacks/SLOTH
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Bugfix
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   * Fix over-restrictive length limit in GCM. Found by Andreas-N. #362
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   * Fix bug in certificate validation that caused valid chains to be rejected
     when the first intermediate certificate has pathLenConstraint=0. Found by
     Nicholas Wilson. Introduced in mbed TLS 2.2.0. #280
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   * Removed potential leak in mbedtls_rsa_rsassa_pkcs1_v15_sign(), found by
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     JayaraghavendranK. #372
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   * Fix suboptimal handling of unexpected records that caused interop issues
     with some peers over unreliable links. Avoid dropping an entire DTLS
     datagram if a single record in a datagram is unexpected, instead only
     drop the record and look at subsequent records (if any are present) in
     the same datagram. Found by jeannotlapin. #345
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= mbed TLS 2.2.0 released 2015-11-04
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Security
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   * Fix potential double free if mbedtls_ssl_conf_psk() is called more than
     once and some allocation fails. Cannot be forced remotely. Found by Guido
     Vranken, Intelworks.
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   * Fix potential heap corruption on Windows when
     mbedtls_x509_crt_parse_path() is passed a path longer than 2GB. Cannot be
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     triggered remotely. Found by Guido Vranken, Intelworks.
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   * Fix potential buffer overflow in some asn1_write_xxx() functions.
     Cannot be triggered remotely unless you create X.509 certificates based
     on untrusted input or write keys of untrusted origin. Found by Guido
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     Vranken, Intelworks.
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   * The X509 max_pathlen constraint was not enforced on intermediate
     certificates. Found by Nicholas Wilson, fix and tests provided by
     Janos Follath. #280 and #319

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Features
   * Experimental support for EC J-PAKE as defined in Thread 1.0.0.
     Disabled by default as the specification might still change.
   * Added a key extraction callback to accees the master secret and key
     block. (Potential uses include EAP-TLS and Thread.)
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Bugfix
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   * Self-signed certificates were not excluded from pathlen counting,
     resulting in some valid X.509 being incorrectly rejected. Found and fix
     provided by Janos Follath. #319
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   * Fix build error with configurations where ECDHE-PSK is the only key
     exchange. Found and fix provided by Chris Hammond. #270
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   * Fix build error with configurations where RSA, RSA-PSK, ECDH-RSA or
     ECHD-ECDSA if the only key exchange. Multiple reports. #310
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   * Fixed a bug causing some handshakes to fail due to some non-fatal alerts
     not being properly ignored. Found by mancha and Kasom Koht-arsa, #308
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   * mbedtls_x509_crt_verify(_with_profile)() now also checks the key type and
     size/curve against the profile. Before that, there was no way to set a
     minimum key size for end-entity certificates with RSA keys. Found by
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     Matthew Page of Scannex Electronics Ltd.
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   * Fix failures in MPI on Sparc(64) due to use of bad assembly code.
     Found by Kurt Danielson. #292
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   * Fix typo in name of the extKeyUsage OID. Found by inestlerode, #314
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   * Fix bug in ASN.1 encoding of booleans that caused generated CA
     certificates to be rejected by some applications, including OS X
     Keychain. Found and fixed by Jonathan Leroy, Inikup.
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Changes
   * Improved performance of mbedtls_ecp_muladd() when one of the scalars is 1
     or -1.
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= mbed TLS 2.1.2 released 2015-10-06

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Security
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   * Added fix for CVE-2015-5291 to prevent heap corruption due to buffer
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     overflow of the hostname or session ticket. Found by Guido Vranken,
     Intelworks.
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   * Fix potential double-free if mbedtls_ssl_set_hs_psk() is called more than
     once in the same handhake and mbedtls_ssl_conf_psk() was used.
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     Found and patch provided by Guido Vranken, Intelworks. Cannot be forced
     remotely.
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   * Fix stack buffer overflow in pkcs12 decryption (used by
     mbedtls_pk_parse_key(file)() when the password is > 129 bytes.
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     Found by Guido Vranken, Intelworks. Not triggerable remotely.
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   * Fix potential buffer overflow in mbedtls_mpi_read_string().
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     Found by Guido Vranken, Intelworks. Not exploitable remotely in the context
     of TLS, but might be in other uses. On 32 bit machines, requires reading a
     string of close to or larger than 1GB to exploit; on 64 bit machines, would
     require reading a string of close to or larger than 2^62 bytes.
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   * Fix potential random memory allocation in mbedtls_pem_read_buffer()
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     on crafted PEM input data. Found and fix provided by Guido Vranken,
     Intelworks. Not triggerable remotely in TLS. Triggerable remotely if you
     accept PEM data from an untrusted source.
   * Fix possible heap buffer overflow in base64_encoded() when the input
     buffer is 512MB or larger on 32-bit platforms. Found by Guido Vranken,
     Intelworks. Not trigerrable remotely in TLS.
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   * Fix potential double-free if mbedtls_conf_psk() is called repeatedly on
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     the same mbedtls_ssl_config object and memory allocation fails. Found by
     Guido Vranken, Intelworks. Cannot be forced remotely.
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   * Fix potential heap buffer overflow in servers that perform client
     authentication against a crafted CA cert. Cannot be triggered remotely
     unless you allow third parties to pick trust CAs for client auth.
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     Found by Guido Vranken, Intelworks.
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Bugfix
   * Fix compile error in net.c with musl libc. Found and patch provided by
     zhasha (#278).
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   * Fix macroization of 'inline' keyword when building as C++. (#279)
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Changes
   * Added checking of hostname length in mbedtls_ssl_set_hostname() to ensure
     domain names are compliant with RFC 1035.
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   * Fixed paths for check_config.h in example config files. (Found by bachp)
     (#291)
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= mbed TLS 2.1.1 released 2015-09-17
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Security
   * Add countermeasure against Lenstra's RSA-CRT attack for PKCS#1 v1.5
     signatures. (Found by Florian Weimer, Red Hat.)
     https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/
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   * Fix possible client-side NULL pointer dereference (read) when the client
     tries to continue the handshake after it failed (a misuse of the API).
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     (Found and patch provided by Fabian Foerg, Gotham Digital Science using
     afl-fuzz.)
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Bugfix
   * Fix warning when using a 64bit platform. (found by embedthis) (#275)
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   * Fix off-by-one error in parsing Supported Point Format extension that
     caused some handshakes to fail.

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Changes
   * Made X509 profile pointer const in mbedtls_ssl_conf_cert_profile() to allow
     use of mbedtls_x509_crt_profile_next. (found by NWilson)
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   * When a client initiates a reconnect from the same port as a live
     connection, if cookie verification is available
     (MBEDTLS_SSL_DTLS_HELLO_VERIFY defined in config.h, and usable cookie
     callbacks set with mbedtls_ssl_conf_dtls_cookies()), this will be
     detected and mbedtls_ssl_read() will return
     MBEDTLS_ERR_SSL_CLIENT_RECONNECT - it is then possible to start a new
     handshake with the same context. (See RFC 6347 section 4.2.8.)
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= mbed TLS 2.1.0 released 2015-09-04
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Features
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   * Added support for yotta as a build system.
   * Primary open source license changed to Apache 2.0 license.
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Bugfix
   * Fix segfault in the benchmark program when benchmarking DHM.
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   * Fix build error with CMake and pre-4.5 versions of GCC (found by Hugo
     Leisink).
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   * Fix bug when parsing a ServerHello without extensions (found by David
     Sears).
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   * Fix bug in CMake lists that caused libmbedcrypto.a not to be installed
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     (found by Benoit Lecocq).
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   * Fix bug in Makefile that caused libmbedcrypto and libmbedx509 not to be
     installed (found by Rawi666).
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   * Fix compile error with armcc 5 with --gnu option.
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   * Fix bug in Makefile that caused programs not to be installed correctly
     (found by robotanarchy) (#232).
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   * Fix bug in Makefile that prevented from installing without building the
     tests (found by robotanarchy) (#232).
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   * Fix missing -static-libgcc when building shared libraries for Windows
     with make.
   * Fix link error when building shared libraries for Windows with make.
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   * Fix error when loading libmbedtls.so.
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   * Fix bug in mbedtls_ssl_conf_default() that caused the default preset to
     be always used (found by dcb314) (#235)
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   * Fix bug in mbedtls_rsa_public() and mbedtls_rsa_private() that could
     result trying to unlock an unlocked mutex on invalid input (found by
     Fredrik Axelsson) (#257)
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   * Fix -Wshadow warnings (found by hnrkp) (#240)
   * Fix memory corruption on client with overlong PSK identity, around
     SSL_MAX_CONTENT_LEN or higher - not triggerrable remotely (found by
     Aleksandrs Saveljevs) (#238)
   * Fix unused function warning when using MBEDTLS_MDx_ALT or
     MBEDTLS_SHAxxx_ALT (found by Henrik) (#239)
   * Fix memory corruption in pkey programs (found by yankuncheng) (#210)
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Changes
   * The PEM parser now accepts a trailing space at end of lines (#226).
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   * It is now possible to #include a user-provided configuration file at the
     end of the default config.h by defining MBEDTLS_USER_CONFIG_FILE on the
     compiler's command line.
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   * When verifying a certificate chain, if an intermediate certificate is
     trusted, no later cert is checked. (suggested by hannes-landeholm)
     (#220).
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   * Prepend a "thread identifier" to debug messages (issue pointed out by
     Hugo Leisink) (#210).
   * Add mbedtls_ssl_get_max_frag_len() to query the current maximum fragment
     length.
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= mbed TLS 2.0.0 released 2015-07-13
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Features
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   * Support for DTLS 1.0 and 1.2 (RFC 6347).
   * Ability to override core functions from MDx, SHAx, AES and DES modules
     with custom implementation (eg hardware accelerated), complementing the
     ability to override the whole module.
   * New server-side implementation of session tickets that rotate keys to
     preserve forward secrecy, and allows sharing across multiple contexts.
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   * Added a concept of X.509 cerificate verification profile that controls
     which algorithms and key sizes (curves for ECDSA) are acceptable.
   * Expanded configurability of security parameters in the SSL module with
     mbedtls_ssl_conf_dhm_min_bitlen() and mbedtls_ssl_conf_sig_hashes().
   * Introduced a concept of presets for SSL security-relevant configuration
     parameters.
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API Changes
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   * The library has been split into libmbedcrypto, libmbedx509, libmbedtls.
     You now need to link to all of them if you use TLS for example.
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   * All public identifiers moved to the mbedtls_* or MBEDTLS_* namespace.
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     Some names have been further changed to make them more consistent.
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     Migration helpers scripts/rename.pl and include/mbedlts/compat-1.3.h are
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     provided. Full list of renamings in scripts/data_files/rename-1.3-2.0.txt
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   * Renamings of fields inside structures, not covered by the previous list:
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     mbedtls_cipher_info_t.key_length -> key_bitlen
     mbedtls_cipher_context_t.key_length -> key_bitlen
     mbedtls_ecp_curve_info.size -> bit_size
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   * Headers are now found in the 'mbedtls' directory (previously 'polarssl').
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   * The following _init() functions that could return errors have
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     been split into an _init() that returns void and another function that
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     should generally be the first function called on this context after init:
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     mbedtls_ssl_init() -> mbedtls_ssl_setup()
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     mbedtls_ccm_init() -> mbedtls_ccm_setkey()
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     mbedtls_gcm_init() -> mbedtls_gcm_setkey()
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     mbedtls_hmac_drbg_init() -> mbedtls_hmac_drbg_seed(_buf)()
     mbedtls_ctr_drbg_init()  -> mbedtls_ctr_drbg_seed()
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     Note that for mbedtls_ssl_setup(), you need to be done setting up the
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     ssl_config structure before calling it.
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   * Most ssl_set_xxx() functions (all except ssl_set_bio(), ssl_set_hostname(),
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     ssl_set_session() and ssl_set_client_transport_id(), plus
     ssl_legacy_renegotiation()) have been renamed to mbedtls_ssl_conf_xxx()
     (see rename.pl and compat-1.3.h above) and their first argument's type
     changed from ssl_context to ssl_config.
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   * ssl_set_bio() changed signature (contexts merged, order switched, one
     additional callback for read-with-timeout).
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   * The following functions have been introduced and must be used in callback
     implementations (SNI, PSK) instead of their *conf counterparts:
     mbedtls_ssl_set_hs_own_cert()
     mbedtls_ssl_set_hs_ca_chain()
     mbedtls_ssl_set_hs_psk()
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   * mbedtls_ssl_conf_ca_chain() lost its last argument (peer_cn), now set
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     using mbedtls_ssl_set_hostname().
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   * mbedtls_ssl_conf_session_cache() changed prototype (only one context
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     pointer, parameters reordered).
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   * On server, mbedtls_ssl_conf_session_tickets_cb() must now be used in
     place of mbedtls_ssl_conf_session_tickets() to enable session tickets.
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   * The SSL debug callback gained two new arguments (file name, line number).
   * Debug modes were removed.
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   * mbedtls_ssl_conf_truncated_hmac() now returns void.
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   * mbedtls_memory_buffer_alloc_init() now returns void.
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   * X.509 verification flags are now an uint32_t. Affect the signature of:
     mbedtls_ssl_get_verify_result()
     mbedtls_x509_ctr_verify_info()
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     mbedtls_x509_crt_verify() (flags, f_vrfy -> needs to be updated)
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     mbedtls_ssl_conf_verify() (f_vrfy -> needs to be updated)
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   * The following functions changed prototype to avoid an in-out length
     parameter:
     mbedtls_base64_encode()
     mbedtls_base64_decode()
     mbedtls_mpi_write_string()
     mbedtls_dhm_calc_secret()
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   * In the NET module, all "int" and "int *" arguments for file descriptors
     changed type to "mbedtls_net_context *".
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   * net_accept() gained new arguments for the size of the client_ip buffer.
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   * In the threading layer, mbedtls_mutex_init() and mbedtls_mutex_free() now
     return void.
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   * ecdsa_write_signature() gained an addtional md_alg argument and
     ecdsa_write_signature_det() was deprecated.
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   * pk_sign() no longer accepts md_alg == POLARSSL_MD_NONE with ECDSA.
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   * Last argument of x509_crt_check_key_usage() and
     mbedtls_x509write_crt_set_key_usage() changed from int to unsigned.
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   * test_ca_list (from certs.h) is renamed to test_cas_pem and is only
     available if POLARSSL_PEM_PARSE_C is defined (it never worked without).
   * Test certificates in certs.c are no longer guaranteed to be nul-terminated
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     strings; use the new *_len variables instead of strlen().
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   * Functions mbedtls_x509_xxx_parse(), mbedtls_pk_parse_key(),
     mbedtls_pk_parse_public_key() and mbedtls_dhm_parse_dhm() now expect the
     length parameter to include the terminating null byte for PEM input.
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   * Signature of mpi_mul_mpi() changed to make the last argument unsigned
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   * calloc() is now used instead of malloc() everywhere. API of platform
     layer and the memory_buffer_alloc module changed accordingly.
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     (Thanks to Mansour Moufid for helping with the replacement.)
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   * Change SSL_DISABLE_RENEGOTIATION config.h flag to SSL_RENEGOTIATION
     (support for renegotiation now needs explicit enabling in config.h).
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   * Split MBEDTLS_HAVE_TIME into MBEDTLS_HAVE_TIME and MBEDTLS_HAVE_TIME_DATE
     in config.h
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   * net_connect() and net_bind() have a new 'proto' argument to choose
     between TCP and UDP, using the macros NET_PROTO_TCP or NET_PROTO_UDP.
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     Their 'port' argument type is changed to a string.
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   * Some constness fixes

Removals
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   * Removed mbedtls_ecp_group_read_string(). Only named groups are supported.
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   * Removed mbedtls_ecp_sub() and mbedtls_ecp_add(), use
     mbedtls_ecp_muladd().
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   * Removed individual mdX_hmac, shaX_hmac, mdX_file and shaX_file functions
     (use generic functions from md.h)
   * Removed mbedtls_timing_msleep(). Use mbedtls_net_usleep() or a custom
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     waiting function.
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   * Removed test DHM parameters from the test certs module.
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   * Removed the PBKDF2 module (use PKCS5).
   * Removed POLARSSL_ERROR_STRERROR_BC (use mbedtls_strerror()).
   * Removed compat-1.2.h (helper for migrating from 1.2 to 1.3).
   * Removed openssl.h (very partial OpenSSL compatibility layer).
   * Configuration options POLARSSL_HAVE_LONGLONG was removed (now always on).
   * Configuration options POLARSSL_HAVE_INT8 and POLARSSL_HAVE_INT16 have
     been removed (compiler is required to support 32-bit operations).
   * Configuration option POLARSSL_HAVE_IPV6 was removed (always enabled).
   * Removed test program o_p_test, the script compat.sh does more.
   * Removed test program ssl_test, superseded by ssl-opt.sh.
   * Removed helper script active-config.pl
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New deprecations
   * md_init_ctx() is deprecated in favour of md_setup(), that adds a third
     argument (allowing memory savings if HMAC is not used)
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Semi-API changes (technically public, morally private)
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   * Renamed a few headers to include _internal in the name. Those headers are
     not supposed to be included by users.
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   * Changed md_info_t into an opaque structure (use md_get_xxx() accessors).
   * Changed pk_info_t into an opaque structure.
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   * Changed cipher_base_t into an opaque structure.
   * Removed sig_oid2 and rename sig_oid1 to sig_oid in x509_crt and x509_crl.
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   * x509_crt.key_usage changed from unsigned char to unsigned int.
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   * Removed r and s from ecdsa_context
   * Removed mode from des_context and des3_context
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Default behavior changes
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   * The default minimum TLS version is now TLS 1.0.
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   * RC4 is now blacklisted by default in the SSL/TLS layer, and excluded from the
     default ciphersuite list returned by ssl_list_ciphersuites()
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   * Support for receiving SSLv2 ClientHello is now disabled by default at
     compile time.
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   * The default authmode for SSL/TLS clients is now REQUIRED.
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   * Support for RSA_ALT contexts in the PK layer is now optional. Since is is
     enabled in the default configuration, this is only noticeable if using a
     custom config.h
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   * Default DHM parameters server-side upgraded from 1024 to 2048 bits.
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   * A minimum RSA key size of 2048 bits is now enforced during ceritificate
     chain verification.
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   * Negotiation of truncated HMAC is now disabled by default on server too.
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   * The following functions are now case-sensitive:
     mbedtls_cipher_info_from_string()
     mbedtls_ecp_curve_info_from_name()
     mbedtls_md_info_from_string()
     mbedtls_ssl_ciphersuite_from_string()
     mbedtls_version_check_feature()
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Requirement changes
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   * The minimum MSVC version required is now 2010 (better C99 support).
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   * The NET layer now unconditionnaly relies on getaddrinfo() and select().
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   * Compiler is required to support C99 types such as long long and uint32_t.
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API changes from the 1.4 preview branch
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   * ssl_set_bio_timeout() was removed, split into mbedtls_ssl_set_bio() with
     new prototype, and mbedtls_ssl_set_read_timeout().
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   * The following functions now return void:
     mbedtls_ssl_conf_transport()
     mbedtls_ssl_conf_max_version()
     mbedtls_ssl_conf_min_version()
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   * DTLS no longer hard-depends on TIMING_C, but uses a callback interface
     instead, see mbedtls_ssl_set_timer_cb(), with the Timing module providing
     an example implementation, see mbedtls_timing_delay_context and
     mbedtls_timing_set/get_delay().
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   * With UDP sockets, it is no longer necessary to call net_bind() again
     after a successful net_accept().
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453 454 455
Changes
   * mbedtls_ctr_drbg_random() and mbedtls_hmac_drbg_random() are now
     thread-safe if MBEDTLS_THREADING_C is enabled.
456 457
   * Reduced ROM fooprint of SHA-256 and added an option to reduce it even
     more (at the expense of performance) MBEDTLS_SHA256_SMALLER.
458

459 460 461
= mbed TLS 1.3 branch

Security
462
   * With authmode set to SSL_VERIFY_OPTIONAL, verification of keyUsage and
463 464
     extendedKeyUsage on the leaf certificate was lost (results not accessible
     via ssl_get_verify_results()).
465 466
   * Add countermeasure against "Lucky 13 strikes back" cache-based attack,
     https://dl.acm.org/citation.cfm?id=2714625
467 468

Features
469 470
   * Improve ECC performance by using more efficient doubling formulas
     (contributed by Peter Dettman).
471
   * Add x509_crt_verify_info() to display certificate verification results.
472
   * Add support for reading DH parameters with privateValueLength included
473
     (contributed by Daniel Kahn Gillmor).
474 475
   * Add support for bit strings in X.509 names (request by Fredrik Axelsson).
   * Add support for id-at-uniqueIdentifier in X.509 names.
476 477 478 479
   * Add support for overriding snprintf() (except on Windows) and exit() in
     the platform layer.
   * Add an option to use macros instead of function pointers in the platform
     layer (helps get rid of unwanted references).
480 481
   * Improved Makefiles for Windows targets by fixing library targets and making
     cross-compilation easier (thanks to Alon Bar-Lev).
482 483 484 485 486 487
   * The benchmark program also prints heap usage for public-key primitives
     if POLARSSL_MEMORY_BUFFER_ALLOC_C and POLARSSL_MEMORY_DEBUG are defined.
   * New script ecc-heap.sh helps measuring the impact of ECC parameters on
     speed and RAM (heap only for now) usage.
   * New script memory.sh helps measuring the ROM and RAM requirements of two
     reduced configurations (PSK-CCM and NSA suite B).
488
   * Add config flag POLARSSL_DEPRECATED_WARNING (off by default) to produce
489
     warnings on use of deprecated functions (with GCC and Clang only).
490
   * Add config flag POLARSSL_DEPRECATED_REMOVED (off by default) to produce
491
     errors on use of deprecated functions.
492 493

Bugfix
494
   * Fix compile errors with PLATFORM_NO_STD_FUNCTIONS.
495
   * Fix compile error with PLATFORM_EXIT_ALT (thanks to Rafał Przywara).
496 497
   * Fix bug in entropy.c when THREADING_C is also enabled that caused
     entropy_free() to crash (thanks to Rafał Przywara).
498 499
   * Fix memory leak when gcm_setkey() and ccm_setkey() are used more than
     once on the same context.
500 501
   * Fix bug in ssl_mail_client when password is longer that username (found
     by Bruno Pape).
502 503
   * Fix undefined behaviour (memcmp( NULL, NULL, 0 );) in X.509 modules
     (detected by Clang's 3.6 UBSan).
504 505
   * mpi_size() and mpi_msb() would segfault when called on an mpi that is
     initialized but not set (found by pravic).
506 507
   * Fix detection of support for getrandom() on Linux (reported by syzzer) by
     doing it at runtime (using uname) rather that compile time.
508
   * Fix handling of symlinks by "make install" (found by Gaël PORTAY).
509 510 511
   * Fix potential NULL pointer dereference (not trigerrable remotely) when
     ssl_write() is called before the handshake is finished (introduced in
     1.3.10) (first reported by Martin Blumenstingl).
512 513
   * Fix bug in pk_parse_key() that caused some valid private EC keys to be
     rejected.
514
   * Fix bug in Via Padlock support (found by Nikos Mavrogiannopoulos).
515
   * Fix thread safety bug in RSA operations (found by Fredrik Axelsson).
516 517
   * Fix hardclock() (only used in the benchmarking program) with some
     versions of mingw64 (found by kxjhlele).
518
   * Fix warnings from mingw64 in timing.c (found by kxjklele).
519 520
   * Fix potential unintended sign extension in asn1_get_len() on 64-bit
     platforms.
521
   * Fix potential memory leak in ssl_set_psk() (found by Mansour Moufid).
522 523 524
   * Fix compile error when POLARSSL_SSL_DISABLE_RENEGOTATION and
     POLARSSL_SSL_SSESSION_TICKETS where both enabled in config.h (introduced
     in 1.3.10).
525
   * Add missing extern "C" guard in aesni.h (reported by amir zamani).
526 527
   * Add missing dependency on SHA-256 in some x509 programs (reported by
     Gergely Budai).
528 529
   * Fix bug related to ssl_set_curves(): the client didn't check that the
     curve picked by the server was actually allowed.
530 531

Changes
532 533 534
   * Remove bias in mpi_gen_prime (contributed by Pascal Junod).
   * Remove potential sources of timing variations (some contributed by Pascal
     Junod).
535
   * Options POLARSSL_HAVE_INT8 and POLARSSL_HAVE_INT16 are deprecated.
536
   * Enabling POLARSSL_NET_C without POLARSSL_HAVE_IPV6 is deprecated.
537
   * compat-1.2.h and openssl.h are deprecated.
538
   * Adjusting/overriding CFLAGS and LDFLAGS with the make build system is now
539 540
     more flexible (warning: OFLAGS is not used any more) (see the README)
     (contributed by Alon Bar-Lev).
541
   * ssl_set_own_cert() no longer calls pk_check_pair() since the
542
     performance impact was bad for some users (this was introduced in 1.3.10).
543 544
   * Move from SHA-1 to SHA-256 in example programs using signatures
     (suggested by Thorsten Mühlfelder).
545 546 547 548
   * Remove some unneeded inclusions of header files from the standard library
     "minimize" others (eg use stddef.h if only size_t is needed).
   * Change #include lines in test files to use double quotes instead of angle
     brackets for uniformity with the rest of the code.
549
   * Remove dependency on sscanf() in X.509 parsing modules.
550

551
= mbed TLS 1.3.10 released 2015-02-09
552 553
Security
   * NULL pointer dereference in the buffer-based allocator when the buffer is
554
     full and polarssl_free() is called (found by Mark Hasemeyer)
555 556
     (only possible if POLARSSL_MEMORY_BUFFER_ALLOC_C is enabled, which it is
     not by default).
557
   * Fix remotely-triggerable uninitialised pointer dereference caused by
558
     crafted X.509 certificate (TLS server is not affected if it doesn't ask for a
559
     client certificate) (found using Codenomicon Defensics).
560
   * Fix remotely-triggerable memory leak caused by crafted X.509 certificates
561 562 563 564
     (TLS server is not affected if it doesn't ask for a client certificate)
     (found using Codenomicon Defensics).
   * Fix potential stack overflow while parsing crafted X.509 certificates
     (TLS server is not affected if it doesn't ask for a client certificate)
565
     (found using Codenomicon Defensics).
566 567 568
   * Fix timing difference that could theoretically lead to a
     Bleichenbacher-style attack in the RSA and RSA-PSK key exchanges
     (reported by Sebastian Schinzel).
569

570
Features
571 572 573
   * Add support for FALLBACK_SCSV (draft-ietf-tls-downgrade-scsv).
   * Add support for Extended Master Secret (draft-ietf-tls-session-hash).
   * Add support for Encrypt-then-MAC (RFC 7366).
574
   * Add function pk_check_pair() to test if public and private keys match.
575
   * Add x509_crl_parse_der().
576 577
   * Add compile-time option POLARSSL_X509_MAX_INTERMEDIATE_CA to limit the
     length of an X.509 verification chain.
578
   * Support for renegotiation can now be disabled at compile-time
579
   * Support for 1/n-1 record splitting, a countermeasure against BEAST.
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580
   * Certificate selection based on signature hash, preferring SHA-1 over SHA-2
581
     for pre-1.2 clients when multiple certificates are available.
582 583
   * Add support for getrandom() syscall on recent Linux kernels with Glibc or
     a compatible enough libc (eg uClibc).
584
   * Add ssl_set_arc4_support() to make it easier to disable RC4 at runtime
585
     while using the default ciphersuite list.
586 587
   * Added new error codes and debug messages about selection of
     ciphersuite/certificate.
588

589 590 591
Bugfix
   * Stack buffer overflow if ctr_drbg_update() is called with too large
     add_len (found by Jean-Philippe Aumasson) (not triggerable remotely).
592 593
   * Possible buffer overflow of length at most POLARSSL_MEMORY_ALIGN_MULTIPLE
     if memory_buffer_alloc_init() was called with buf not aligned and len not
594 595
     a multiple of POLARSSL_MEMORY_ALIGN_MULTIPLE (not triggerable remotely).
   * User set CFLAGS were ignored by Cmake with gcc (introduced in 1.3.9, found
596
     by Julian Ospald).
597
   * Fix potential undefined behaviour in Camellia.
598 599
   * Fix potential failure in ECDSA signatures when POLARSSL_ECP_MAX_BITS is a
     multiple of 8 (found by Gergely Budai).
600 601
   * Fix unchecked return code in x509_crt_parse_path() on Windows (found by
     Peter Vaskovic).
602
   * Fix assembly selection for MIPS64 (thanks to James Cowgill).
603 604
   * ssl_get_verify_result() now works even if the handshake was aborted due
     to a failed verification (found by Fredrik Axelsson).
605 606 607 608
   * Skip writing and parsing signature_algorithm extension if none of the
     key exchanges enabled needs certificates. This fixes a possible interop
     issue with some servers when a zero-length extension was sent. (Reported
     by Peter Dettman.)
609 610
   * On a 0-length input, base64_encode() did not correctly set output length
     (found by Hendrik van den Boogaard).
611

612 613 614
Changes
   * Use deterministic nonces for AEAD ciphers in TLS by default (possible to
     switch back to random with POLARSSL_SSL_AEAD_RANDOM_IV in config.h).
615
   * Blind RSA private operations even when POLARSSL_RSA_NO_CRT is defined.
616
   * ssl_set_own_cert() now returns an error on key-certificate mismatch.
617
   * Forbid repeated extensions in X.509 certificates.
618
   * debug_print_buf() now prints a text view in addition to hexadecimal.
619 620
   * A specific error is now returned when there are ciphersuites in common
     but none of them is usable due to external factors such as no certificate
621
     with a suitable (extended)KeyUsage or curve or no PSK set.
622
   * It is now possible to disable negotiation of truncated HMAC server-side
623
     at runtime with ssl_set_truncated_hmac().
624 625
   * Example programs for SSL client and server now disable SSLv3 by default.
   * Example programs for SSL client and server now disable RC4 by default.
626
   * Use platform.h in all test suites and programs.
627

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= PolarSSL 1.3.9 released 2014-10-20
629 630 631
Security
   * Lowest common hash was selected from signature_algorithms extension in
     TLS 1.2 (found by Darren Bane) (introduced in 1.3.8).
632
   * Remotely-triggerable memory leak when parsing some X.509 certificates
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     (server is not affected if it doesn't ask for a client certificate)
     (found using Codenomicon Defensics).
635
   * Remotely-triggerable memory leak when parsing crafted ClientHello
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     (not affected if ECC support was compiled out) (found using Codenomicon
     Defensics).
638

639 640
Bugfix
   * Support escaping of commas in x509_string_to_names()
641
   * Fix compile error in ssl_pthread_server (found by Julian Ospald).
642
   * Fix net_accept() regarding non-blocking sockets (found by Luca Pesce).
643
   * Don't print uninitialised buffer in ssl_mail_client (found by Marc Abel).
644
   * Fix warnings from Clang's scan-build (contributed by Alfred Klomp).
645 646
   * Fix compile error in timing.c when POLARSSL_NET_C and POLARSSL_SELFTEST
     are defined but not POLARSSL_HAVE_TIME (found by Stephane Di Vito).
647
   * Remove non-existent file from VS projects (found by Peter Vaskovic).
648 649
   * ssl_read() could return non-application data records on server while
     renegotation was pending, and on client when a HelloRequest was received.
650 651
   * Server-initiated renegotiation would fail with non-blocking I/O if the
     write callback returned WANT_WRITE when requesting renegotiation.
652 653
   * ssl_close_notify() could send more than one message in some circumstances
     with non-blocking I/O.
654
   * Fix compiler warnings on iOS (found by Sander Niemeijer).
655
   * x509_crt_parse() did not increase total_failed on PEM error
656
   * Fix compile error with armcc in mpi_is_prime()
657 658
   * Fix potential bad read in parsing ServerHello (found by Adrien
     Vialletelle).
659

660 661 662
Changes
   * Ciphersuites using SHA-256 or SHA-384 now require TLS 1.x (there is no
     standard defining how to use SHA-2 with SSL 3.0).
663 664
   * Ciphersuites using RSA-PSK key exchange new require TLS 1.x (the spec is
     ambiguous on how to encode some packets with SSL 3.0).
665 666
   * Made buffer size in pk_write_(pub)key_pem() more dynamic, eg smaller if
     RSA is disabled, larger if POLARSSL_MPI_MAX_SIZE is larger.
667 668
   * ssl_read() now returns POLARSSL_ERR_NET_WANT_READ rather than
     POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE on harmless alerts.
669 670
   * POLARSSL_MPI_MAX_SIZE now defaults to 1024 in order to allow 8192 bits
     RSA keys.
671
   * Accept spaces at end of line or end of buffer in base64_decode().
672 673
   * X.509 certificates with more than one AttributeTypeAndValue per
     RelativeDistinguishedName are not accepted any more.
674

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= PolarSSL 1.3.8 released 2014-07-11
676 677 678 679 680
Security
   * Fix length checking for AEAD ciphersuites (found by Codenomicon).
     It was possible to crash the server (and client) using crafted messages
     when a GCM suite was chosen.

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681 682 683
Features
   * Add CCM module and cipher mode to Cipher Layer
   * Support for CCM and CCM_8 ciphersuites
684 685
   * Support for parsing and verifying RSASSA-PSS signatures in the X.509
     modules (certificates, CRLs and CSRs).
686
   * Blowfish in the cipher layer now supports variable length keys.
687 688
   * Add example config.h for PSK with CCM, optimized for low RAM usage.
   * Optimize for RAM usage in example config.h for NSA Suite B profile.
689 690
   * Add POLARSSL_REMOVE_ARC4_CIPHERSUITES to allow removing RC4 ciphersuites
     from the default list (inactive by default).
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691 692
   * Add server-side enforcement of sent renegotiation requests
     (ssl_set_renegotiation_enforced())
693 694
   * Add SSL_CIPHERSUITES config.h flag to allow specifying a list of
     ciphersuites to use and save some memory if the list is small.
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696 697 698
Changes
   * Add LINK_WITH_PTHREAD option in CMake for explicit linking that is
     required on some platforms (e.g. OpenBSD)
699 700
   * Migrate zeroizing of data to polarssl_zeroize() instead of memset()
     against unwanted compiler optimizations
701
   * md_list() now returns hashes strongest first
702 703
   * Selection of hash for signing ServerKeyExchange in TLS 1.2 now picks
     strongest offered by client.
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   * All public contexts have _init() and _free() functions now for simpler
     usage pattern
706

707 708
Bugfix
   * Fix in debug_print_msg()
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709
   * Enforce alignment in the buffer allocator even if buffer is not aligned
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710
   * Remove less-than-zero checks on unsigned numbers
711 712
   * Stricter check on SSL ClientHello internal sizes compared to actual packet
     size (found by TrustInSoft)
713 714 715 716
   * Fix WSAStartup() return value check (found by Peter Vaskovic)
   * Other minor issues (found by Peter Vaskovic)
   * Fix symlink command for cross compiling with CMake (found by Andre
     Heinecke)
717
   * Fix DER output of gen_key app (found by Gergely Budai)
718
   * Very small records were incorrectly rejected when truncated HMAC was in
719 720
     use with some ciphersuites and versions (RC4 in all versions, CBC with
     versions < TLS 1.1).
721 722 723 724
   * Very large records using more than 224 bytes of padding were incorrectly
     rejected with CBC-based ciphersuites and TLS >= 1.1
   * Very large records using less padding could cause a buffer overread of up
     to 32 bytes with CBC-based ciphersuites and TLS >= 1.1
725 726
   * Restore ability to use a v1 cert as a CA if trusted locally. (This had
     been removed in 1.3.6.)
727 728 729
   * Restore ability to locally trust a self-signed cert that is not a proper
     CA for use as an end entity certificate. (This had been removed in
     1.3.6.)
730
   * Fix preprocessor checks for bn_mul PPC asm (found by Barry K. Nathan).
731 732
   * Use \n\t rather than semicolons for bn_mul asm, since some assemblers
     interpret semicolons as comment delimiters (found by Barry K. Nathan).
733 734
   * Fix off-by-one error in parsing Supported Point Format extension that
     caused some handshakes to fail.
735 736 737
   * Fix possible miscomputation of the premaster secret with DHE-PSK key
     exchange that caused some handshakes to fail with other implementations.
     (Failure rate <= 1/255 with common DHM moduli.)
738
   * Disable broken Sparc64 bn_mul assembly (found by Florian Obser).
739 740
   * Fix base64_decode() to return and check length correctly (in case of
     tight buffers)
741 742
   * Fix mpi_write_string() to write "00" as hex output for empty MPI (found
     by Hui Dong)
743

744
= PolarSSL 1.3.7 released on 2014-05-02
745
Features
746 747
   * debug_set_log_mode() added to determine raw or full logging
   * debug_set_threshold() added to ignore messages over threshold level
748 749
   * version_check_feature() added to check for compile-time options at
     run-time
750

751 752 753
Changes
   * POLARSSL_CONFIG_OPTIONS has been removed. All values are individually
     checked and filled in the relevant module headers
754
   * Debug module only outputs full lines instead of parts
755
   * Better support for the different Attribute Types from IETF PKIX (RFC 5280)
756
   * AES-NI now compiles with "old" assemblers too
757
   * Ciphersuites based on RC4 now have the lowest priority by default
758

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759 760 761
Bugfix
   * Only iterate over actual certificates in ssl_write_certificate_request()
     (found by Matthew Page)
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762 763
   * Typos in platform.c and pkcs11.c (found by Daniel Phillips and Steffan
     Karger)
764
   * cert_write app should use subject of issuer certificate as issuer of cert
765 766
   * Fix false reject in padding check in ssl_decrypt_buf() for CBC
     ciphersuites, for full SSL frames of data.
767 768
   * Improve interoperability by not writing extension length in ClientHello /
     ServerHello when no extensions are present (found by Matthew Page)
769
   * rsa_check_pubkey() now allows an E up to N
770
   * On OpenBSD, use arc4random_buf() instead of rand() to prevent warnings
771 772
   * mpi_fill_random() was creating numbers larger than requested on
     big-endian platform when size was not an integer number of limbs
773
   * Fix dependencies issues in X.509 test suite.
774
   * Some parts of ssl_tls.c were compiled even when the module was disabled.
775
   * Fix detection of DragonflyBSD in net.c (found by Markus Pfeiffer)
776 777
   * Fix detection of Clang on some Apple platforms with CMake
     (found by Barry K. Nathan)
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= PolarSSL 1.3.6 released on 2014-04-11
780

781 782
Features
   * Support for the ALPN SSL extension
783
   * Add option 'use_dev_random' to gen_key application
784
   * Enable verification of the keyUsage extension for CA and leaf
785
     certificates (POLARSSL_X509_CHECK_KEY_USAGE)
786 787
   * Enable verification of the extendedKeyUsage extension
     (POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
788

789 790
Changes
   * x509_crt_info() now prints information about parsed extensions as well
791 792
   * pk_verify() now returns a specific error code when the signature is valid
     but shorter than the supplied length.
793
   * Use UTC time to check certificate validity.
794
   * Reject certificates with times not in UTC, per RFC 5280.
795

796 797 798
Security
   * Avoid potential timing leak in ecdsa_sign() by blinding modular division.
     (Found by Watson Ladd.)
799 800 801 802
   * The notAfter date of some certificates was no longer checked since 1.3.5.
     This affects certificates in the user-supplied chain except the top
     certificate. If the user-supplied chain contains only one certificates,
     it is not affected (ie, its notAfter date is properly checked).
803 804
   * Prevent potential NULL pointer dereference in ssl_read_record() (found by
     TrustInSoft)
805

806 807
Bugfix
   * The length of various ClientKeyExchange messages was not properly checked.
808
   * Some example server programs were not sending the close_notify alert.
809 810
   * Potential memory leak in mpi_exp_mod() when error occurs during
     calculation of RR.
811
   * Fixed malloc/free default #define in platform.c (found by Gergely Budai).
812 813
   * Fixed type which made POLARSSL_ENTROPY_FORCE_SHA256 uneffective (found by
     Gergely Budai).
814 815
   * Fix #include path in ecdsa.h which wasn't accepted by some compilers.
     (found by Gergely Budai)
816 817
   * Fix compile errors when POLARSSL_ERROR_STRERROR_BC is undefined (found by
     Shuo Chen).
818 819
   * oid_get_numeric_string() used to truncate the output without returning an
     error if the output buffer was just 1 byte too small.
820
   * dhm_parse_dhm() (hence dhm_parse_dhmfile()) did not set dhm->len.
821 822
   * Calling pk_debug() on an RSA-alt key would segfault.
   * pk_get_size() and pk_get_len() were off by a factor 8 for RSA-alt keys.
823 824
   * Potential buffer overwrite in pem_write_buffer() because of low length
     indication (found by Thijs Alkemade)
825 826
   * EC curves constants, which should be only in ROM since 1.3.3, were also
     stored in RAM due to missing 'const's (found by Gergely Budai).
827

828
= PolarSSL 1.3.5 released on 2014-03-26
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Features
   * HMAC-DRBG as a separate module
831
   * Option to set the Curve preference order (disabled by default)
832
   * Single Platform compatilibity layer (for memory / printf / fprintf)
833
   * Ability to provide alternate timing implementation
834 835
   * Ability to force the entropy module to use SHA-256 as its basis
     (POLARSSL_ENTROPY_FORCE_SHA256)
836 837
   * Testing script ssl-opt.sh added for testing 'live' ssl option
     interoperability against OpenSSL and PolarSSL
838
   * Support for reading EC keys that use SpecifiedECDomain in some cases.
839
   * Entropy module now supports seed writing and reading
840 841 842

Changes
   * Deprecated the Memory layer
843 844
   * entropy_add_source(), entropy_update_manual() and entropy_gather()
     now thread-safe if POLARSSL_THREADING_C defined
845
   * Improvements to the CMake build system, contributed by Julian Ospald.
846 847
   * Work around a bug of the version of Clang shipped by Apple with Mavericks
     that prevented bignum.c from compiling. (Reported by Rafael Baptista.)
848 849
   * Revamped the compat.sh interoperatibility script to include support for
     testing against GnuTLS
850
   * Deprecated ssl_set_own_cert_rsa() and ssl_set_own_cert_rsa_alt()
851
   * Improvements to tests/Makefile, contributed by Oden Eriksson.
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853 854
Security
   * Forbid change of server certificate during renegotiation to prevent
855
     "triple handshake" attack when authentication mode is 'optional' (the
856
     attack was already impossible when authentication is required).
857
   * Check notBefore timestamp of certificates and CRLs from the future.
858
   * Forbid sequence number wrapping
859
   * Fixed possible buffer overflow with overlong PSK
860 861
   * Possible remotely-triggered out-of-bounds memory access fixed (found by
     TrustInSoft)
862

863 864 865
Bugfix
   * ecp_gen_keypair() does more tries to prevent failure because of
     statistics
866
   * Fixed bug in RSA PKCS#1 v1.5 "reversed" operations
867
   * Fixed testing with out-of-source builds using cmake
868
   * Fixed version-major intolerance in server
869
   * Fixed CMake symlinking on out-of-source builds
870
   * Fixed dependency issues in test suite
871
   * Programs rsa_sign_pss and rsa_verify_pss were not using PSS since 1.3.0
872 873
   * Bignum's MIPS-32 assembly was used on MIPS-64, causing chaos. (Found by
     Alex Wilson.)
874 875
   * ssl_cache was creating entries when max_entries=0 if TIMING_C was enabled.
   * m_sleep() was sleeping twice too long on most Unix platforms.
876
   * Fixed bug with session tickets and non-blocking I/O in the unlikely case
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     send() would return an EAGAIN error when sending the ticket.
878
   * ssl_cache was leaking memory when reusing a timed out entry containing a
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     client certificate.
880
   * ssl_srv was leaking memory when client presented a timed out ticket
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     containing a client certificate
882 883
   * ssl_init() was leaving a dirty pointer in ssl_context if malloc of
     out_ctr failed
884 885
   * ssl_handshake_init() was leaving dirty pointers in subcontexts if malloc
     of one of them failed
886
   * Fix typo in rsa_copy() that impacted PKCS#1 v2 contexts
887
   * x509_get_current_time() uses localtime_r() to prevent thread issues
888

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889
= PolarSSL 1.3.4 released on 2014-01-27
890
Features
891
   * Support for the Koblitz curves: secp192k1, secp224k1, secp256k1
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892
   * Support for RIPEMD-160
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893
   * Support for AES CFB8 mode
894
   * Support for deterministic ECDSA (RFC 6979)
895 896 897 898

Bugfix
   * Potential memory leak in bignum_selftest()
   * Replaced expired test certificate
899
   * ssl_mail_client now terminates lines with CRLF, instead of LF
900 901
   * net module handles timeouts on blocking sockets better (found by Tilman
     Sauerbeck)
902 903 904
   * Assembly format fixes in bn_mul.h

Security
905 906
   * Missing MPI_CHK calls added around unguarded mpi calls (found by
     TrustInSoft)
907

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908
= PolarSSL 1.3.3 released on 2013-12-31
909 910
Features
   * EC key generation support in gen_key app
911 912
   * Support for adhering to client ciphersuite order preference
     (POLARSSL_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
913
   * Support for Curve25519
914
   * Support for ECDH-RSA and ECDH-ECDSA key exchanges and ciphersuites
915
   * Support for IPv6 in the NET module
916
   * AES-NI support for AES, AES-GCM and AES key scheduling
917
   * SSL Pthread-based server example added (ssl_pthread_server)
918

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Changes
   * gen_prime() speedup
   * Speedup of ECP multiplication operation
   * Relaxed some SHA2 ciphersuite's version requirements
923
   * Dropped use of readdir_r() instead of readdir() with threading support
924
   * More constant-time checks in the RSA module
925
   * Split off curves from ecp.c into ecp_curves.c
926
   * Curves are now stored fully in ROM
927
   * Memory usage optimizations in ECP module
928
   * Removed POLARSSL_THREADING_DUMMY
929

930
Bugfix
931
   * Fixed bug in mpi_set_bit() on platforms where t_uint is wider than int
932
   * Fixed X.509 hostname comparison (with non-regular characters)
933
   * SSL now gracefully handles missing RNG
934 935
   * Missing defines / cases for RSA_PSK key exchange
   * crypt_and_hash app checks MAC before final decryption
936
   * Potential memory leak in ssl_ticket_keys_init()
937
   * Memory leak in benchmark application
938
   * Fixed x509_crt_parse_path() bug on Windows platforms
939 940
   * Added missing MPI_CHK() around some statements in mpi_div_mpi() (found by
     TrustInSoft)
941 942
   * Fixed potential overflow in certificate size verification in
     ssl_write_certificate() (found by TrustInSoft)
943

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Security
   * Possible remotely-triggered out-of-bounds memory access fixed (found by
     TrustInSoft)

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948
= PolarSSL 1.3.2 released on 2013-11-04
949 950
Features
   * PK tests added to test framework
951
   * Added optional optimization for NIST MODP curves (POLARSSL_ECP_NIST_OPTIM)
952
   * Support for Camellia-GCM mode and ciphersuites
953

954 955
Changes
   * Padding checks in cipher layer are now constant-time
956
   * Value comparisons in SSL layer are now constant-time
957
   * Support for serialNumber, postalAddress and postalCode in X509 names
958
   * SSL Renegotiation was refactored
959

960
Bugfix
961
   * More stringent checks in cipher layer
962
   * Server does not send out extensions not advertised by client
963
   * Prevent possible alignment warnings on casting from char * to 'aligned *'
964
   * Misc fixes and additions to dependency checks
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965
   * Const correctness
966
   * cert_write with selfsign should use issuer_name as subject_name
967
   * Fix ECDSA corner case: missing reduction mod N (found by DualTachyon)
968
   * Defines to handle UEFI environment under MSVC
969
   * Server-side initiated renegotiations send HelloRequest
970

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971
= PolarSSL 1.3.1 released on 2013-10-15
972 973
Features
   * Support for Brainpool curves and TLS ciphersuites (RFC 7027)
974
   * Support for ECDHE-PSK key-exchange and ciphersuites
975
   * Support for RSA-PSK key-exchange and ciphersuites
976

977 978
Changes
   * RSA blinding locks for a smaller amount of time
979
   * TLS compression only allocates working buffer once
980
   * Introduced POLARSSL_HAVE_READDIR_R for systems without it
981
   * config.h is more script-friendly
982 983 984 985 986

Bugfix
   * Missing MSVC defines added
   * Compile errors with POLARSSL_RSA_NO_CRT
   * Header files with 'polarssl/'
987
   * Const correctness
988
   * Possible naming collision in dhm_context
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989
   * Better support for MSVC
990
   * threading_set_alt() name
991
   * Added missing x509write_crt_set_version()
992

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993
= PolarSSL 1.3.0 released on 2013-10-01
994 995 996 997 998
Features
   * Elliptic Curve Cryptography module added
   * Elliptic Curve Diffie Hellman module added
   * Ephemeral Elliptic Curve Diffie Hellman support for SSL/TLS
    (ECDHE-based ciphersuites)
999 1000
   * Ephemeral Elliptic Curve Digital Signature Algorithm support for SSL/TLS
    (ECDSA-based ciphersuites)
1001
   * Ability to specify allowed ciphersuites based on the protocol version.
1002
   * PSK and DHE-PSK based ciphersuites added
1003 1004
   * Memory allocation abstraction layer added
   * Buffer-based memory allocator added (no malloc() / free() / HEAP usage)
1005
   * Threading abstraction layer added (dummy / pthread / alternate)
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1006
   * Public Key abstraction layer added
1007 1008 1009 1010
   * Parsing Elliptic Curve keys
   * Parsing Elliptic Curve certificates
   * Support for max_fragment_length extension (RFC 6066)
   * Support for truncated_hmac extension (RFC 6066)
1011 1012
   * Support for zeros-and-length (ANSI X.923) padding, one-and-zeros
     (ISO/IEC 7816-4) padding and zero padding in the cipher layer
1013
   * Support for session tickets (RFC 5077)
1014 1015
   * Certificate Request (CSR) generation with extensions (key_usage,
     ns_cert_type)
1016 1017
   * X509 Certificate writing with extensions (basic_constraints,
     issuer_key_identifier, etc)
1018
   * Optional blinding for RSA, DHM and EC
1019 1020
   * Support for multiple active certificate / key pairs in SSL servers for
   	 the same host (Not to be confused with SNI!)
1021

1022
Changes
1023 1024
   * Ability to enable / disable SSL v3 / TLS 1.0 / TLS 1.1 / TLS 1.2
     individually
1025 1026
   * Introduced separate SSL Ciphersuites module that is based on
     Cipher and MD information
1027 1028
   * Internals for SSL module adapted to have separate IV pointer that is
     dynamically set (Better support for hardware acceleration)
1029 1030
   * Moved all OID functionality to a separate module. RSA function
     prototypes for the RSA sign and verify functions changed as a result
1031
   * Split up the GCM module into a starts/update/finish cycle
1032 1033
   * Client and server now filter sent and accepted ciphersuites on minimum
     and maximum protocol version
1034
   * Ability to disable server_name extension (RFC 6066)
1035 1036
   * Renamed error_strerror() to the less conflicting polarssl_strerror()
     (Ability to keep old as well with POLARSSL_ERROR_STRERROR_BC)
1037
   * SHA2 renamed to SHA256, SHA4 renamed to SHA512 and functions accordingly
1038
   * All RSA operations require a random generator for blinding purposes
1039 1040
   * X509 core refactored
   * x509_crt_verify() now case insensitive for cn (RFC 6125 6.4)
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1041
   * Also compiles / runs without time-based functions (!POLARSSL_HAVE_TIME)
1042 1043
   * Support faulty X509 v1 certificates with extensions
     (POLARSSL_X509_ALLOW_EXTENSIONS_NON_V3)
1044

1045
Bugfix
1046
   * Fixed parse error in ssl_parse_certificate_request()
1047
   * zlib compression/decompression skipped on empty blocks
1048
   * Support for AIX header locations in net.c module
1049
   * Fixed file descriptor leaks
1050

1051 1052 1053 1054
Security
   * RSA blinding on CRT operations to counter timing attacks
     (found by Cyril Arnaud and Pierre-Alain Fouque)

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= Version 1.2.14 released 2015-05-??

Security
   * Fix potential invalid memory read in the server, that allows a client to
     crash it remotely (found by Caj Larsson).
   * Fix potential invalid memory read in certificate parsing, that allows a
     client to crash the server remotely if client authentication is enabled
     (found using Codenomicon Defensics).
   * Add countermeasure against "Lucky 13 strikes back" cache-based attack,
     https://dl.acm.org/citation.cfm?id=2714625

Bugfix
   * Fix bug in Via Padlock support (found by Nikos Mavrogiannopoulos).
   * Fix hardclock() (only used in the benchmarking program) with some
     versions of mingw64 (found by kxjhlele).
   * Fix warnings from mingw64 in timing.c (found by kxjklele).
   * Fix potential unintended sign extension in asn1_get_len() on 64-bit
     platforms (found with Coverity Scan).

= Version 1.2.13 released 2015-02-16
Note: Although PolarSSL has been renamed to mbed TLS, no changes reflecting
      this will be made in the 1.2 branch at this point.

Security
   * Fix remotely-triggerable uninitialised pointer dereference caused by
     crafted X.509 certificate (TLS server is not affected if it doesn't ask
     for a client certificate) (found using Codenomicon Defensics).
   * Fix remotely-triggerable memory leak caused by crafted X.509 certificates
     (TLS server is not affected if it doesn't ask for a client certificate)
     (found using Codenomicon Defensics).
   * Fix potential stack overflow while parsing crafted X.509 certificates
     (TLS server is not affected if it doesn't ask for a client certificate)
     found using Codenomicon Defensics).
   * Fix buffer overread of size 1 when parsing crafted X.509 certificates
     (TLS server is not affected if it doesn't ask for a client certificate).

Bugfix
   * Fix potential undefined behaviour in Camellia.
   * Fix memory leaks in PKCS#5 and PKCS#12.
   * Stack buffer overflow if ctr_drbg_update() is called with too large
     add_len (found by Jean-Philippe Aumasson) (not triggerable remotely).
   * Fix bug in MPI/bignum on s390/s390x (reported by Dan Horák) (introduced
     in 1.2.12).
   * Fix unchecked return code in x509_crt_parse_path() on Windows (found by
     Peter Vaskovic).
   * Fix assembly selection for MIPS64 (thanks to James Cowgill).
   * ssl_get_verify_result() now works even if the handshake was aborted due
     to a failed verification (found by Fredrik Axelsson).
   * Skip writing and parsing signature_algorithm extension if none of the
     key exchanges enabled needs certificates. This fixes a possible interop
     issue with some servers when a zero-length extension was sent. (Reported
     by Peter Dettman.)
   * On a 0-length input, base64_encode() did not correctly set output length
     (found by Hendrik van den Boogaard).

Changes
   * Blind RSA private operations even when POLARSSL_RSA_NO_CRT is defined.
   * Forbid repeated extensions in X.509 certificates.
   * Add compile-time option POLARSSL_X509_MAX_INTERMEDIATE_CA to limit the
     length of an X.509 verification chain (default = 8).
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= Version 1.2.12 released 2014-10-24

Security
   * Remotely-triggerable memory leak when parsing some X.509 certificates
     (server is not affected if it doesn't ask for a client certificate).
     (Found using Codenomicon Defensics.)

Bugfix
   * Fix potential bad read in parsing ServerHello (found by Adrien
     Vialletelle).
   * ssl_close_notify() could send more than one message in some circumstances
     with non-blocking I/O.
   * x509_crt_parse() did not increase total_failed on PEM error
   * Fix compiler warnings on iOS (found by Sander Niemeijer).
   * Don't print uninitialised buffer in ssl_mail_client (found by Marc Abel).
   * Fix net_accept() regarding non-blocking sockets (found by Luca Pesce).
   * ssl_read() could return non-application data records on server while
     renegotation was pending, and on client when a HelloRequest was received.
   * Fix warnings from Clang's scan-build (contributed by Alfred Klomp).

Changes
   * X.509 certificates with more than one AttributeTypeAndValue per
     RelativeDistinguishedName are not accepted any more.
   * ssl_read() now returns POLARSSL_ERR_NET_WANT_READ rather than
     POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE on harmless alerts.
   * Accept spaces at end of line or end of buffer in base64_decode().

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