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* seskey.c (encode_md_value): Print an error message if a wrong

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digest algorithm is used with DSA.  Changed all callers to cope
with a NULL return.  Problem noted by Imad R. Faiad.
This commit is contained in:
Werner Koch 2002-04-18 19:38:34 +00:00
parent 30c8d23aff
commit aedeefcc5f
4 changed files with 30 additions and 6 deletions
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14
g10/sig-check.c
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@ -291,6 +291,8 @@ do_check( PKT_public_key *pk, PKT_signature *sig, MD_HANDLE digest,
result = encode_md_value( pk->pubkey_algo, digest, sig->digest_algo,
mpi_get_nbits(pk->pkey[0]), 0 );
if (!result)
return G10ERR_GENERAL;
ctx.sig = sig;
ctx.md = digest;
rc = pubkey_verify( pk->pubkey_algo, result, sig->data, pk->pkey,
@ -302,10 +304,14 @@ do_check( PKT_public_key *pk, PKT_signature *sig, MD_HANDLE digest,
* the hash right. There is no problem with DSA however */
result = encode_md_value( pk->pubkey_algo, digest, sig->digest_algo,
mpi_get_nbits(pk->pkey[0]), (sig->version < 5) );
ctx.sig = sig;
ctx.md = digest;
rc = pubkey_verify( pk->pubkey_algo, result, sig->data, pk->pkey,
cmp_help, &ctx );
if (!result)
rc = G10ERR_GENERAL;
else {
ctx.sig = sig;
ctx.md = digest;
rc = pubkey_verify( pk->pubkey_algo, result, sig->data, pk->pkey,
cmp_help, &ctx );
}
}
if( !rc && sig->flags.unknown_critical ) {