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The SHA4 name was not clear with regards to the new SHA-3 standard. So
SHA2 and SHA4 have been renamed to better represent what they are:
SHA256 and SHA512 modules.

Ability to keep old function error_strerror() as well with
POLARSSL_ERROR_STRERROR_BC. Also works with
POLARSSL_ERROR_STRERROR_DUMMY.

capabilities

and maximum protocol version

A generic function for retrieving the AlgorithmIdentifier structure with
its parameters and adapted X509, PKCS#5 and PKCS#12 to use them.

More fixes based on the compiler directives -Wcast-qual -Wwrite-strings
-Wmissing-prototypes -Wmissing-declarations. Not everything with regards
to -Wcast-qual has been fixed as some have unwanted consequences for the
rest of the code.

(cherry picked from commit da7fdbd5)

(cherry picked from commit 602c31be)

(cherry picked from commit db7ea6f1)

The 3-key and 2-key Triple DES PBE functions have been replaced with a
single pkcs12_pbe() function that handles both situations (and more).

In addition this allows for some PASSWORD_MISMATCH checking
(cherry picked from commit 14a222ce)

(cherry picked from commit 2be71faa)

POLARSSL_ERR_X509_PASSWORD_MISMATCH is returned instead of
POLARSSL_ERR_PEM_PASSWORD_MISMATCH and
POLARSSL_ERR_X509_PASSWORD_REQUIRED instead of
POLARSSL_ERR_PEM_PASSWORD_REQUIRED

Rationale: For PKCS#8 encrypted keys the same are returned
(cherry picked from commit b495d3a2)

(cherry picked from commit 1fc7dfe2)

(cherry picked from commit ff3a4b01)