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GOST R 34.10 sign

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orignal 2017-03-09 20:13:21 -05:00
parent 7f71d5dbd8
commit 439c2d445c
1 changed files with 20 additions and 0 deletions
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20
Signature.cpp
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@ -532,6 +532,26 @@ namespace crypto
return EC_POINT_get_affine_coordinates_GFp (m_Group, p, x, y, nullptr);
}
void Sign (const BIGNUM * priv, const BIGNUM * digest, BIGNUM * r, BIGNUM * s)
{
BN_CTX * ctx = BN_CTX_new ();
BN_CTX_start (ctx);
BIGNUM * q = BN_CTX_get (ctx);
EC_GROUP_get_order(m_Group, q, ctx);
BIGNUM * k = BN_CTX_get (ctx);
BN_rand_range (k, q); // 0 < k < q
EC_POINT * C = MulP (k); // C = k*P
GetXY (C, r, nullptr); // r = Cx
EC_POINT_free (C);
BN_mod_mul (s, r, priv, q, ctx); // (r*priv)%q
BIGNUM * tmp = BN_CTX_get (ctx);
BN_mod_mul (tmp, k, digest, q, ctx); // (k*digest)%q
BN_mod_add (s, s, tmp, q, ctx); // (r*priv+k*digest)%q
BN_CTX_end (ctx);
BN_CTX_free (ctx);
}
private:
EC_GROUP * m_Group;