GitLab

- better error codes
- rm now-useless include

Also fix a const-corectness issue.

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.

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)

The error code POLARSSL_ERR_X509_PASSWORD_MISMATCH is now properly
returned in case of an encryption failure in the padding. The
POLARSSL_ERR_X509_PASSWORD_REQUIRED error code is only returned for PEM
formatted private keys as for DER formatted ones it is impossible to
distinguish if a DER blob is PKCS#8 encrypted or not.
(cherry picked from commit 1fd4321b)

Conflicts:
	include/polarssl/error.h
	scripts/generate_errors.pl

old PBKDF2 module.
(cherry picked from commit 19bd297d)

Conflicts:
	include/polarssl/error.h
	scripts/generate_errors.pl

PKCS#8 encrypted key file support has been added to x509parse_key() with
support for some PCKS#12 PBE functions (pbeWithSHAAnd128BitRC4,
pbeWithSHAAnd3-KeyTripleDES-CBC and pbeWithSHAAnd2-KeyTripleDES-CBC)
(cherry picked from commit cf6e95d9)

Conflicts:
	scripts/generate_errors.pl

After header and footer are read, pem_read_buffer() is able to determine
the length of input data used. This allows calling functions to skip
this PEM bit if an error occurs during its parsing.
(cherry picked from commit 9255e830)

(cherry picked from commit eae09db9)

Conflicts:
	library/gcm.c