/// <summary>
/// Signature
/// </summary>
/// <param name="data"></param>
/// <param name="userId"></param>
/// <param name="publicKey"></param>
/// <returns></returns>
public static byte[] Signature2(byte[] data, byte[] userId, byte[] publicKey)
{
if (publicKey is null || publicKey.Length == 0)
{
return(null);
}
if (data is null || data.Length == 0)
{
return(null);
}
SM2Core sm2 = SM2Core.Instance;
BigInteger userD = new BigInteger(Hex.Decode(publicKey));
ECPoint userKey = sm2.ecc_point_g.Multiply(userD);
SM2Core.SM2_SM3Digest sm3 = new SM2Core.SM2_SM3Digest();
byte[] z = sm2.Sm2GetZ(userId, userKey);
sm3.BlockUpdate(z, 0, z.Length);
sm3.BlockUpdate(data, 0, data.Length);
byte[] md = new byte[32];
sm3.DoFinal(md, 0);
SM2Result sm2Result = new SM2Result();
sm2.Sm2Sign(md, userD, userKey, sm2Result);
DerInteger d_r = new DerInteger(sm2Result.r);
DerInteger d_s = new DerInteger(sm2Result.s);
Asn1EncodableVector v2 = new Asn1EncodableVector();
v2.Add(d_r);
v2.Add(d_s);
DerSequence sign = new DerSequence(v2);
byte[] signdata = sign.GetEncoded();
return(signdata);
}
/// <summary>
/// Verify<br />
/// </summary>
/// <param name="userId"></param>
/// <param name="privateKey"></param>
/// <param name="sourceData"></param>
/// <param name="signData"></param>
/// <returns></returns>
public static bool Verify2(byte[] userId, byte[] privateKey, byte[] sourceData, byte[] signData)
{
if (privateKey is null || privateKey.Length == 0)
{
return(false);
}
if (sourceData is null || sourceData.Length == 0)
{
return(false);
}
SM2Core sm2 = SM2Core.Instance;
ECPoint userKey = sm2.ecc_curve.DecodePoint(Hex.Encode(privateKey));
SM2Core.SM2_SM3Digest sm3 = new SM2Core.SM2_SM3Digest();
byte[] z = sm2.Sm2GetZ(userId, userKey);
sm3.BlockUpdate(z, 0, z.Length);
sm3.BlockUpdate(sourceData, 0, sourceData.Length);
byte[] md = new byte[32];
sm3.DoFinal(md, 0);
MemoryInputStream bis = new MemoryInputStream(signData);
Asn1InputStream dis = new Asn1InputStream(bis);
Asn1Object derObj = dis.ReadObject();
var e = (Asn1Sequence)derObj;
DerInteger r = (DerInteger)e[0];
DerInteger s = (DerInteger)e[1];
SM2Result sm2Result = new SM2Result();
sm2Result.r = r.PositiveValue;
sm2Result.s = s.PositiveValue;
sm2.Sm2Verify(md, userKey, sm2Result.r, sm2Result.s, sm2Result);
return(sm2Result.r.Equals(sm2Result.R));
}