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| author | jkim <jkim@FreeBSD.org> | 2012-06-27 16:44:58 +0000 |
|---|---|---|
| committer | jkim <jkim@FreeBSD.org> | 2012-06-27 16:44:58 +0000 |
| commit | 1554498e64df093a519f9074c3412047f398aa17 (patch) | |
| tree | cc5cd6657453d80b7eafb3ba5cc4ef4fd66c176f /crypto/ecdsa/ecs_ossl.c | |
| parent | ae03beb758270fb19d741c93f7bfde88a6635612 (diff) | |
| download | FreeBSD-src-1554498e64df093a519f9074c3412047f398aa17.zip FreeBSD-src-1554498e64df093a519f9074c3412047f398aa17.tar.gz | |
Import OpenSSL 0.9.8x.
Diffstat (limited to 'crypto/ecdsa/ecs_ossl.c')
| -rw-r--r-- | crypto/ecdsa/ecs_ossl.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/crypto/ecdsa/ecs_ossl.c b/crypto/ecdsa/ecs_ossl.c index 551cf50..1bbf328 100644 --- a/crypto/ecdsa/ecs_ossl.c +++ b/crypto/ecdsa/ecs_ossl.c @@ -144,6 +144,14 @@ static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp, } while (BN_is_zero(k)); + /* We do not want timing information to leak the length of k, + * so we compute G*k using an equivalent scalar of fixed + * bit-length. */ + + if (!BN_add(k, k, order)) goto err; + if (BN_num_bits(k) <= BN_num_bits(order)) + if (!BN_add(k, k, order)) goto err; + /* compute r the x-coordinate of generator * k */ if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx)) { |
