ecc: Add support for GOST R 34.10-2001/-2012 signatures

* src/cipher.h: define PUBKEY_FLAG_GOST
* cipher/ecc-curves.c: Add GOST2001-test and GOST2012-test curves
  defined in standards. Typical applications would use either those
  curves, or curves defined in RFC 4357 (will be added later).
* cipher/ecc.c (sign_gost, verify_gost): New.
  (ecc_sign, ecc_verify): use sign_gost/verify_gost if PUBKEY_FLAG_GOST
  is set.
  (ecc_names): add "gost" for gost signatures.
* cipher/pubkey-util.c (_gcry_pk_util_parse_flaglist,
  _gcry_pk_util_preparse_sigval): set PUBKEY_FLAG_GOST if gost flag
  is present in s-exp.
* tests/benchmark.c (ecc_bench): also benchmark GOST signatures.
* tests/basic.c (check_pubkey): add two public keys from
  GOST R 34.10-2012 standard.
  (check_pubkey_sign_ecdsa): add two data sets to check gost signatures.
* tests/curves.c: correct N_CURVES as we now have 2 more curves.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

Removed some comments from the new curve definitions in ecc-curves.c
to avoid line wrapping.  Eventually we will develop a precompiler to
avoid parsing those hex strings. -wk

1 files changed, 7 insertions, 0 deletions

diff --git a/cipher/pubkey-util.c b/cipher/pubkey-util.c
index 0b90054f..0db5840b 100644
--- a/cipher/pubkey-util.c
+++ b/cipher/pubkey-util.c
@@ -79,6 +79,11 @@ _gcry_pk_util_parse_flaglist (gcry_sexp_t list,
         {
           flags |= PUBKEY_FLAG_ECDSA;
         }
+      else if (n == 4 && !memcmp (s, "gost", 4))
+        {
+          encoding = PUBKEY_ENC_RAW;
+          flags |= PUBKEY_FLAG_GOST;
+        }
       else if (n == 3 && !memcmp (s, "raw", 3)
                && encoding == PUBKEY_ENC_UNKNOWN)
         {
@@ -347,6 +352,8 @@ _gcry_pk_util_preparse_sigval (gcry_sexp_t s_sig, const char **algo_names,
     {
       if (!strcmp (name, "eddsa"))
         *r_eccflags = PUBKEY_FLAG_EDDSA;
+      if (!strcmp (name, "gost"))
+        *r_eccflags = PUBKEY_FLAG_GOST;
     }
 
   *r_parms = l2;