md: add variable length output interface
authorJussi Kivilinna <jussi.kivilinna@iki.fi>
Sun, 25 Oct 2015 12:50:41 +0000 (14:50 +0200)
committerJussi Kivilinna <jussi.kivilinna@iki.fi>
Wed, 28 Oct 2015 18:12:22 +0000 (20:12 +0200)
commit577dc2b63ceca6a8a716256d034ea4e7414f65fa
treef66c541c2b1c5d2593c450241ec662f9711b6669
parentcee2e122ec6c1886957a8d47498eb63a6a921725
md: add variable length output interface

* cipher/crc.c (_gcry_digest_spec_crc32)
(_gcry_digest_spec_crc32_rfc1510, _gcry_digest_spec_crc24_rfc2440): Set
'extract' NULL.
* cipher/gostr3411-94.c (_gcry_digest_spec_gost3411_94)
(_gcry_digest_spec_gost3411_cp): Ditto.
* cipher/keccak.c (_gcry_digest_spec_sha3_224)
(_gcry_digest_spec_sha3_256, _gcry_digest_spec_sha3_384)
(_gcry_digest_spec_sha3_512): Ditto.
* cipher/md2.c (_gcry_digest_spec_md2): Ditto.
* cipher/md4.c (_gcry_digest_spec_md4): Ditto.
* cipher/md5.c (_gcry_digest_spec_md5): Ditto.
* cipher/rmd160.c (_gcry_digest_spec_rmd160): Ditto.
* cipher/sha1.c (_gcry_digest_spec_sha1): Ditto.
* cipher/sha256.c (_gcry_digest_spec_sha224)
(_gcry_digest_spec_sha256): Ditto.
* cipher/sha512.c (_gcry_digest_spec_sha384)
(_gcry_digest_spec_sha512): Ditto.
* cipher/stribog.c (_gcry_digest_spec_stribog_256)
(_gcry_digest_spec_stribog_512): Ditto.
* cipher/tiger.c (_gcry_digest_spec_tiger)
(_gcry_digest_spec_tiger1, _gcry_digest_spec_tiger2): Ditto.
* cipher/whirlpool.c (_gcry_digest_spec_whirlpool): Ditto.
* cipher/md.c (md_enable): Do not allow combination of HMAC and
'expandable-output function'.
(md_final): Check if spec->read is NULL before calling.
(md_read): Ditto.
(md_extract, _gcry_md_extract): New.
* doc/gcrypt.texi: Add SHA3 algorithms and gcry_md_extract.
* src/cipher-proto.h (gcry_md_extract_t): New.
(gcry_md_spec_t): Add 'extract'.
* src/gcrypt-int.g (_gcry_md_extract): New.
* src/gcrypt.h.in (gcry_md_extract): New.
* src/libgcrypt.def: Add gcry_md_extract.
* src/libgcrypt.vers: Add gcry_md_extract.
* src/visibility.c (gcry_md_extract): New.
* src/visibility.h (gcry_md_extract): New.
--

Patch adds new interface for reading output from 'expandable-output
function' MD algorithms that can give variable length output (ie.
SHAKE algorithms from FIPS-202). New function to read output is

 gpg_error_t gcry_md_extract(gcry_md_hd_t md, int algo,
     void *buffer, size_t length);

Function implicitly finalizes algorithm so that no new input can
be given. Subsequents calls of the function return more output
bytes from the algorithm.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
22 files changed:
cipher/crc.c
cipher/gostr3411-94.c
cipher/keccak.c
cipher/md.c
cipher/md2.c
cipher/md4.c
cipher/md5.c
cipher/rmd160.c
cipher/sha1.c
cipher/sha256.c
cipher/sha512.c
cipher/stribog.c
cipher/tiger.c
cipher/whirlpool.c
doc/gcrypt.texi
src/cipher-proto.h
src/gcrypt-int.h
src/gcrypt.h.in
src/libgcrypt.def
src/libgcrypt.vers
src/visibility.c
src/visibility.h