/// <summary>
/// 签名验证算法
/// 利用签名者的公钥和传过来的r，s来验证签名是否合法
/// </summary>
/// <param name="sm2">sm2对象</param>
/// <param name="ppk">签名者的公钥16进制字符串</param>
/// <param name="Z">签名算法产生的16进制字符串 Z</param>
/// <param name="r">签名算法生成的 R</param>
/// <param name="s">签名算法生成的 S</param>
/// <returns></returns>
public bool Signature_Check(SM2 sm2, string ppk, string Z, string r, string s)
{
ECPoint test_p = null;
//test_p = sm2.userKey;
//MessageBox.Show(ppk);
byte[] key = strToToHexByte(ppk);
test_p = sm2.ecc_curve.DecodePoint(key);
Com.Itrus.Crypto.SM2.SM2Result sm2Ret = new Com.Itrus.Crypto.SM2.SM2Result();//实例化一个SM2Result的对象sm2Ret
SM3Digest sm3 = new SM3Digest();
byte[] z = strToToHexByte(Z);
sm3.BlockUpdate(z, 0, z.Length);
byte[] md = new byte[32];
sm3.DoFinal(md, 0);
sm2Ret.r = new BigInteger(r, 16);
sm2Ret.s = new BigInteger(s, 16);
sm2.Sm2Verify(md, test_p, sm2Ret.r, sm2Ret.s, sm2Ret); //调用Sm2Verify方法，得到R
if (sm2Ret.r.Equals(sm2Ret.R)) //如果r==R
{
return(true); //System.Console.Out.WriteLine("\n签名结果验证通过！r == R\n");
}
else//r!=R
{
return(false);//System.Console.Out.WriteLine("\n签名结果验证失败！r != R\n");
}
}
/// <summary>
/// 数字签名算法
/// 利用自己的公私钥生成rs并存入文件
/// </summary>
/// <param name="sm2">sm2对象</param>
/// <param name="pripk">自己的私钥文件夹</param>
/// <param name="ppk">自己的公钥文件路径</param>
/// <param name="ida">用户名</param>
public string Test_sm2_sign(SM2 sm2, string pripk, string ppk, string ida)
{
BigInteger test_d = null;
ECPoint test_p = null;
byte[] key = null;
//读取私钥
Readprikey(out test_d, pripk);
//读取公钥
ReadpublicKey(out key, ppk);
test_p = sm2.ecc_curve.DecodePoint(key);
Com.Itrus.Crypto.SM2.SM2Result sm2Ret = new Com.Itrus.Crypto.SM2.SM2Result();//实例化一个SM2Result的对象sm2Ret
SM3Digest sm3 = new SM3Digest();
byte[] z = sm2.Sm2GetZ(Encoding.Default.GetBytes(ida), test_p);//调用Sm2GetZ方法求a的Z的字节数组
sm3.BlockUpdate(z, 0, z.Length);
byte[] md = new byte[32];
sm3.DoFinal(md, 0);
sm2.Sm2Sign(md, test_d, test_p, sm2Ret); //生成rs
Writers(sm2Ret.r, sm2Ret.s, ida + "rs" + ".txt"); //写入rs文件
return(byteToHexStr(z));
}
