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| author | Werner Koch <wk@gnupg.org> | 2013-07-26 20:15:53 +0200 |
|---|---|---|
| committer | Werner Koch <wk@gnupg.org> | 2013-07-26 20:15:53 +0200 |
| commit | 1cfa79aabc5d0fd8d124901054475e90ab7d9cde (patch) | |
| tree | 9a8b1dbaced1e915ba782ad3b290f15ac2e6045b /cipher/pubkey-internal.h | |
| parent | b72d312ad11887fc416aa821786f6bdb663c0f4a (diff) | |
| download | libgcrypt-1cfa79aabc5d0fd8d124901054475e90ab7d9cde.tar.gz | |
Implement deterministic DSA as specified by rfc-6979.
* cipher/dsa.c (dsa_sign): Move opaque mpi extraction to sign.
(sign): Add args FLAGS and HASHALGO. Implement deterministic DSA.
Add code path for R==0 to comply with the standard.
(dsa_verify): Left fill opaque mpi based hash values.
* cipher/dsa-common.c (int2octets, bits2octets): New.
(_gcry_dsa_gen_rfc6979_k): New.
* tests/dsa-rfc6979.c: New.
* tests/Makefile.am (TESTS): Add dsa-rfc6979.
--
This patch also fixes a recent patch (37d0a1e) which allows to pass
the hash in a (hash) element.
Support for deterministic ECDSA will come soon.
Signed-off-by: Werner Koch <wk@gnupg.org>
Diffstat (limited to 'cipher/pubkey-internal.h')
| -rw-r--r-- | cipher/pubkey-internal.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/cipher/pubkey-internal.h b/cipher/pubkey-internal.h index ae7e77b0..9147cb2d 100644 --- a/cipher/pubkey-internal.h +++ b/cipher/pubkey-internal.h @@ -22,6 +22,12 @@ /*-- dsa-common.h --*/ gcry_mpi_t _gcry_dsa_gen_k (gcry_mpi_t q, int security_level); +gpg_err_code_t _gcry_dsa_gen_rfc6979_k (gcry_mpi_t *r_k, + gcry_mpi_t dsa_q, gcry_mpi_t dsa_x, + const unsigned char *h1, + unsigned int h1len, + int halgo, + unsigned int extraloops); /*-- ecc.c --*/ |