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Add ecdsa_{read,write}_signature()

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Manuel Pégourié-Gonnard 2013-08-08 13:30:57 +02:00
parent 5a8a62ce1c
commit b694b4896c
6 changed files with 206 additions and 3 deletions
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60
tests/suites/test_suite_ecdsa.function
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@ -76,3 +76,63 @@ void ecdsa_prim_test_vectors( int id, char *d_str, char *xQ_str, char *yQ_str,
mpi_free( &r_check ); mpi_free( &s_check );
}
/* END_CASE */
/* BEGIN_CASE */
void ecdsa_write_read_random( int id )
{
ecdsa_context ctx;
rnd_pseudo_info rnd_info;
unsigned char hash[66];
unsigned char sig[200];
size_t sig_len, i;
ecdsa_init( &ctx );
memset( &rnd_info, 0x00, sizeof( rnd_pseudo_info ) );
memset( hash, 0, sizeof( hash ) );
memset( sig, 0x2a, sizeof( sig ) );
/* prepare material for signature */
TEST_ASSERT( rnd_pseudo_rand( &rnd_info, hash, sizeof( hash ) ) == 0 );
/* generate signing key */
TEST_ASSERT( ecp_use_known_dp( &ctx.grp, id ) == 0 );
TEST_ASSERT( ecp_gen_keypair( &ctx.grp, &ctx.d, &ctx.Q,
&rnd_pseudo_rand, &rnd_info ) == 0 );
/* generate and write signature, then read and verify it */
TEST_ASSERT( ecdsa_write_signature( &ctx, hash, sizeof( hash ),
sig, &sig_len, &rnd_pseudo_rand, &rnd_info ) == 0 );
TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
sig, sig_len ) == 0 );
/* check we didn't write past the announced length */
for( i = sig_len; i < sizeof( sig ); i++ )
TEST_ASSERT( sig[i] == 0x2a );
/* try verification with invalid length */
TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
sig, sig_len - 1 ) != 0 );
TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
sig, sig_len + 1 ) != 0 );
/* try invalid sequence tag */
sig[0]++;
TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
sig, sig_len ) != 0 );
sig[0]--;
/* try modifying r */
sig[10]++;
TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
sig, sig_len ) != 0 );
sig[10]--;
/* try modifying s */
sig[sig_len - 1]++;
TEST_ASSERT( ecdsa_read_signature( &ctx, hash, sizeof( hash ),
sig, sig_len ) != 0 );
sig[sig_len - 1]--;
ecdsa_free( &ctx );
}
/* END_CASE */