public static string Encrypt(string publicKey_x, string publicKey_y, string data)
{
publicKey_x = xTool.ConvertTool.RemoveSpace(publicKey_x);
publicKey_y = xTool.ConvertTool.RemoveSpace(publicKey_y);
data = xTool.ConvertTool.RemoveSpace(data);
if (data.Length % 2 != 0)
{
throw new Exception("Invalid Data");
}
ECDSABase ecdsa = new ECDSABase(new ECCurve("SM2"));
string c1, c2, c3, t;
c1 = c2 = c3 = t = "";
string x2, y2;
x2 = y2 = "";
//publicKey_x = "435B39CCA8F3B508C1488AFC67BE491A0F7BA07E581A0E4849A5CF70628A7E0A";
//publicKey_y = "75DDBA78F15FEECB4C7895E2C1CDF5FE01DEBB2CDBADF45399CCF77BBA076A42";
BigInteger x = BigInteger.Parse("00" + publicKey_x, System.Globalization.NumberStyles.AllowHexSpecifier);
BigInteger y = BigInteger.Parse("00" + publicKey_y, System.Globalization.NumberStyles.AllowHexSpecifier);
ECPoint pubkey = new ECPoint(x, y);
bool isContinue = true;
while (isContinue)
{
//BigInteger k = BigInteger.Parse("004C62EEFD6ECFC2B95B92FD6C3D9575148AFA17425546D49018E5388D49DD7B4F", System.Globalization.NumberStyles.AllowHexSpecifier);
//data = "656E6372797074696F6E207374616E64617264";
BigInteger k = ECCMath.RandomIntegerBelow(ECCurve.n);
ECPoint point1 = ECCMath.ScalarMult(k, ECCurve.G);
c1 = Util.ToHexString(point1.X, ECCurve.BitLength) + Util.ToHexString(point1.Y, ECCurve.BitLength);
ECPoint S = ECCMath.ScalarMult(ECCurve.h, pubkey);
if (ECCMath.IsInfinityPoint(S))
{
throw new Exception("S is Infinity Point");
}
ECPoint point2 = ECCMath.ScalarMult(k, pubkey);
x2 = Util.ToHexString(point2.X, ECCurve.BitLength);
y2 = Util.ToHexString(point2.Y, ECCurve.BitLength);
t = KDF(x2 + y2, data.Length * 4);
for (int i = 0; i < t.Length; i++)
{
if (t.Substring(i, 1) != "0")
{
isContinue = false;
break;
}
}
}
c2 = XOR(data, t);
c3 = ALG.GuoMi.SM3(x2 + data + y2);
return(c1 + c3 + c2);
}
public static bool Verify(string publicKey_x, string publicKey_y, string m_hash, string rs_r, string rs_s, string curve = "")
{
publicKey_x = xTool.ConvertTool.RemoveSpace(publicKey_x);
publicKey_y = xTool.ConvertTool.RemoveSpace(publicKey_y);
m_hash = xTool.ConvertTool.RemoveSpace(m_hash);
rs_r = xTool.ConvertTool.RemoveSpace(rs_r);
rs_s = xTool.ConvertTool.RemoveSpace(rs_s);
ECDSABase ecdsa = new ECDSABase(new ECCurve(curve));
BigInteger[] res = new BigInteger[2];
int Length = ECCurve.BitLength / 4;
res[0] = BigInteger.Parse("00" + rs_r, System.Globalization.NumberStyles.AllowHexSpecifier);
res[1] = BigInteger.Parse("00" + rs_s, System.Globalization.NumberStyles.AllowHexSpecifier);
BigInteger x = BigInteger.Parse("00" + publicKey_x, System.Globalization.NumberStyles.AllowHexSpecifier);
BigInteger y = BigInteger.Parse("00" + publicKey_y, System.Globalization.NumberStyles.AllowHexSpecifier);
ECPoint pubKey = new ECPoint(x, y);
bool b = ecdsa.VerifySignature(pubKey,
BigInteger.Parse("00" + m_hash, System.Globalization.NumberStyles.AllowHexSpecifier),
res);
return(b);
}
public static bool Verify(string publicKey_x, string publicKey_y, string data, string rs_r, string rs_s, string id = "")
{
publicKey_x = xTool.ConvertTool.RemoveSpace(publicKey_x);
publicKey_y = xTool.ConvertTool.RemoveSpace(publicKey_y);
data = xTool.ConvertTool.RemoveSpace(data);
rs_r = xTool.ConvertTool.RemoveSpace(rs_r);
rs_s = xTool.ConvertTool.RemoveSpace(rs_s);
id = xTool.ConvertTool.RemoveSpace(id);
if (data.Length % 2 != 0)
{
throw new Exception("Invalid Data");
}
if (id.Length % 2 != 0)
{
throw new Exception("Invalid ID");
}
ECDSABase ecdsa = new ECDSABase(new ECCurve("SM2"));
if (id == "" || id == null)
{
id = "31323334353637383132333435363738";
}
int idLen = id.Length * 4;
string idlen_string = idLen.ToString("X");
while (idlen_string.Length < 4)
{
idlen_string = "0" + idlen_string;
}
string tmp = idlen_string + id + Util.ToHexString(ECCurve.a, ECCurve.BitLength) + Util.ToHexString(ECCurve.b, ECCurve.BitLength) +
Util.ToHexString(ECCurve.G.X, ECCurve.BitLength) + Util.ToHexString(ECCurve.G.Y, ECCurve.BitLength) + publicKey_x + publicKey_y;
string Za = ALG.GuoMi.SM3(tmp);
string e = ALG.GuoMi.SM3(Za + data);
BigInteger[] res = new BigInteger[2];
int Length = ECCurve.BitLength / 4;
res[0] = BigInteger.Parse("00" + rs_r, System.Globalization.NumberStyles.AllowHexSpecifier);
res[1] = BigInteger.Parse("00" + rs_s, System.Globalization.NumberStyles.AllowHexSpecifier);
BigInteger x = BigInteger.Parse("00" + publicKey_x, System.Globalization.NumberStyles.AllowHexSpecifier);
BigInteger y = BigInteger.Parse("00" + publicKey_y, System.Globalization.NumberStyles.AllowHexSpecifier);
ECPoint pubKey = new ECPoint(x, y);
bool b = ecdsa.VerifySignature_SM2(pubKey,
BigInteger.Parse("00" + e, System.Globalization.NumberStyles.AllowHexSpecifier),
res);
return(b);
}
public static string[] GenerateKeyPair(string curve = "")
{
ECDSABase ecdsa = new ECDSABase(new ECCurve(curve));
ECKey key = ecdsa.GenerateKeyPair();
string[] keyPair = new string[3];
keyPair[0] = Util.ToHexString(key.PrivateKey, ECCurve.BitLength);
keyPair[1] = Util.ToHexString(key.PublicKey.X, ECCurve.BitLength);
keyPair[2] = Util.ToHexString(key.PublicKey.Y, ECCurve.BitLength);
return(keyPair);
}
public static string[] Sign(string privateKey, string m_hash, string curve = "")
{
privateKey = xTool.ConvertTool.RemoveSpace(privateKey);
m_hash = xTool.ConvertTool.RemoveSpace(m_hash);
ECDSABase ecdsa = new ECDSABase(new ECCurve(curve));
BigInteger[] res = ecdsa.SignMessage(BigInteger.Parse("00" + privateKey, System.Globalization.NumberStyles.AllowHexSpecifier),
BigInteger.Parse("00" + m_hash, System.Globalization.NumberStyles.AllowHexSpecifier));
string[] tmp = new string[2];
tmp[0] = Util.ToHexString(res[0], ECCurve.BitLength);
tmp[1] = Util.ToHexString(res[1], ECCurve.BitLength);
return(tmp);
}
public static string[] Sign(string privateKey, string data, string id = "")
{
privateKey = xTool.ConvertTool.RemoveSpace(privateKey);
data = xTool.ConvertTool.RemoveSpace(data);
id = xTool.ConvertTool.RemoveSpace(id);
if (data.Length % 2 != 0)
{
throw new Exception("Invalid Data");
}
if (id.Length % 2 != 0)
{
throw new Exception("Invalid ID");
}
ECDSABase ecdsa = new ECDSABase(new ECCurve("SM2"));
if (id == "" || id == null)
{
id = "31323334353637383132333435363738";
}
int idLen = id.Length * 4;
string [] pubkey = Util.GetPublicKey(privateKey, "SM2");
string idlen_string = idLen.ToString("X");
while (idlen_string.Length < 4)
{
idlen_string = "0" + idlen_string;
}
string tmp = idlen_string + id + Util.ToHexString(ECCurve.a, ECCurve.BitLength) + Util.ToHexString(ECCurve.b, ECCurve.BitLength) +
Util.ToHexString(ECCurve.G.X, ECCurve.BitLength) + Util.ToHexString(ECCurve.G.Y, ECCurve.BitLength) + pubkey[0] + pubkey[1];
string Za = ALG.GuoMi.SM3(tmp);
string e = ALG.GuoMi.SM3(Za + data);
BigInteger[] res = ecdsa.SignMessage_SM2(BigInteger.Parse("00" + privateKey, System.Globalization.NumberStyles.AllowHexSpecifier),
BigInteger.Parse("00" + e, System.Globalization.NumberStyles.AllowHexSpecifier));
string[] sign_rs = new string[2];
sign_rs[0] = Util.ToHexString(res[0], ECCurve.BitLength);
sign_rs[1] = Util.ToHexString(res[1], ECCurve.BitLength);
return(sign_rs);
}
public static string[] GetPublicKey(string privatekey, string curve = "")
{
privatekey = xTool.ConvertTool.RemoveSpace(privatekey);
ECDSABase ecdsa = new ECDSABase(new ECCurve(curve));
BigInteger PrivateKey = BigInteger.Parse("00" + privatekey, System.Globalization.NumberStyles.AllowHexSpecifier);
if (!ECCMath.RangeBetween(PrivateKey, 1, ECCurve.n - 1))
{
throw new Exception("Invalid Private Key");
}
var PublicKey = ECCMath.ScalarMult(PrivateKey, ECCurve.G);
string[] key = new string[2];
key[0] = Util.ToHexString(PublicKey.X, ECCurve.BitLength);
key[1] = Util.ToHexString(PublicKey.Y, ECCurve.BitLength);
return(key);
}
public static bool VerifyPublickey(string pub_x, string pub_y, string curve = "")
{
pub_x = xTool.ConvertTool.RemoveSpace(pub_x);
pub_y = xTool.ConvertTool.RemoveSpace(pub_y);
ECDSABase ecdsa = new ECDSABase(new ECCurve(curve));
BigInteger x = BigInteger.Parse("00" + pub_x, System.Globalization.NumberStyles.AllowHexSpecifier);
BigInteger y = BigInteger.Parse("00" + pub_y, System.Globalization.NumberStyles.AllowHexSpecifier);
ECPoint p = new ECPoint(x, y);
if (ECCMath.IsInfinityPoint(p))
{
return(false);
}
if (!ECCMath.RangeBetween(x, BigInteger.One, ECCurve.p - 1))
{
return(false);
}
if (!ECCMath.RangeBetween(y, BigInteger.One, ECCurve.p - 1))
{
return(false);
}
if (!ECCMath.IsOnCurve(p))
{
return(false);
}
ECPoint O = ECCMath.ScalarMult(ECCurve.n, p);
if (!ECCMath.IsInfinityPoint(O))
{
return(false);
}
//throw new Exception("O is NOT Infinity Point");
return(true);
}
public static string Decrypt(string privateKey, string data)
{
privateKey = xTool.ConvertTool.RemoveSpace(privateKey);
data = xTool.ConvertTool.RemoveSpace(data);
if (data.Length % 2 != 0)
{
throw new Exception("Invalid Cipher");
}
if (data.Length < 96 * 2)
{
throw new Exception("Invalid Cipher");
}
ECDSABase ecdsa = new ECDSABase(new ECCurve("SM2"));
string c1, c2, c3, t;
c1 = data.Substring(0, 128);
c3 = data.Substring(128, 64);
c2 = data.Substring(128 + 64);
t = "";
string x2, y2;
x2 = y2 = "";
bool isZero = true;
BigInteger x = BigInteger.Parse("00" + c1.Substring(0, 64), System.Globalization.NumberStyles.AllowHexSpecifier);
BigInteger y = BigInteger.Parse("00" + c1.Substring(64), System.Globalization.NumberStyles.AllowHexSpecifier);
ECPoint C1 = new ECPoint(x, y);
if (!ECCMath.IsOnCurve(C1))
{
throw new Exception("SM2 Decrypt Failed, C1 Not On Curve");
}
ECPoint S = ECCMath.ScalarMult(ECCurve.h, C1);
if (ECCMath.IsInfinityPoint(S))
{
throw new Exception("S is Infinity Point");
}
BigInteger prikey = BigInteger.Parse("00" + privateKey, System.Globalization.NumberStyles.AllowHexSpecifier);
ECPoint point2 = ECCMath.ScalarMult(prikey, C1);
x2 = Util.ToHexString(point2.X, ECCurve.BitLength);
y2 = Util.ToHexString(point2.Y, ECCurve.BitLength);
t = KDF(x2 + y2, c2.Length * 4);
for (int i = 0; i < t.Length; i++)
{
if (t.Substring(i, 1) == "0")
{
continue;
}
else
{
isZero = false;
break;
}
}
if (isZero)
{
throw new Exception("t = 0");
}
string plaindata = XOR(c2, t);
string u = ALG.GuoMi.SM3(x2 + plaindata + y2);
if (!u.Equals(c3, StringComparison.OrdinalIgnoreCase))
{
throw new Exception("SM2 Decrypt Failed, u != C3");
}
return(plaindata);
}
