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); }
/// <summary> /// Generates signature. /// </summary> /// <param name="privateKey"></param> /// <param name="message"></param> /// <returns></returns> public BigInteger[] SignMessage(BigInteger privateKey, BigInteger e) { BigInteger r = 0; BigInteger s = 0; while (r == 0 || s == 0) { BigInteger k = ECCMath.RandomIntegerBelow(ECCurve.n); ECPoint point = ECCMath.ScalarMult(k, ECCurve.G); r = ECCMath.MathMod(point.X, ECCurve.n); s = ECCMath.MathMod((e + r * privateKey) * ECCMath.InverseMod(k, ECCurve.n), ECCurve.n); } BigInteger[] bigInteger = new BigInteger[3]; bigInteger[0] = r; bigInteger[1] = s; return(bigInteger); }
public ECKey(ECCurve eCCurve = null) { Curve = eCCurve; /* * BigInteger P = BigInteger.Parse("00fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger A = BigInteger.Parse("0000", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger B = BigInteger.Parse("0007", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger Gx = BigInteger.Parse("0079be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger Gy = BigInteger.Parse("00483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger N = BigInteger.Parse("00fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", System.Globalization.NumberStyles.AllowHexSpecifier); * var H = 1; */ //SM2 /* * BigInteger P = BigInteger.Parse("00FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger A = BigInteger.Parse("00FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger B = BigInteger.Parse("0028E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger Gx = BigInteger.Parse("0032C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger Gy = BigInteger.Parse("00BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger N = BigInteger.Parse("00FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123", System.Globalization.NumberStyles.AllowHexSpecifier); * var H = 1; * * * * //512bit * BigInteger P = BigInteger.Parse("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger A = BigInteger.Parse("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger B = BigInteger.Parse("0051953EB9618E1C9A1F929A21A0B68540EEA2DA725B99B315F3B8B489918EF109E156193951EC7E937B1652C0BD3BB1BF073573DF883D2C34F1EF451FD46B503F00", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger Gx = BigInteger.Parse("00C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger Gy = BigInteger.Parse("011839296A789A3BC0045C8A5FB42C7D1BD998F54449579B446817AFBD17273E662C97EE72995EF42640C550B9013FAD0761353C7086A272C24088BE94769FD16650", System.Globalization.NumberStyles.AllowHexSpecifier); * BigInteger N = BigInteger.Parse("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386409", System.Globalization.NumberStyles.AllowHexSpecifier); * var H = 1; * * * Curve = new ECCurve(P, A, B, new ECPoint(Gx,Gy), N, H);*/ PrivateKey = ECCMath.RandomIntegerBelow(ECCurve.n - 2); PublicKey = ECCMath.ScalarMult(PrivateKey, ECCurve.G); }
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 bool VerifySignature(ECPoint publicKey, BigInteger e, BigInteger[] signature) { if (!ECCMath.RangeBetween(signature[0], BigInteger.One, ECCurve.n - 1)) { return(false); } if (!ECCMath.RangeBetween(signature[1], BigInteger.One, ECCurve.n - 1)) { return(false); } BigInteger w = ECCMath.InverseMod(signature[1], ECCurve.n); BigInteger u1 = ECCMath.MathMod((e * w), ECCurve.n); BigInteger u2 = ECCMath.MathMod((signature[0] * w), ECCurve.n); ECPoint point = ECCMath.PointAdd(ECCMath.ScalarMult(u1, ECCurve.G), ECCMath.ScalarMult(u2, publicKey)); //if (ECCMath.IsInfinityPoint(point)) // return false; return(ECCMath.MathMod(signature[0], ECCurve.n) == ECCMath.MathMod(point.X, ECCurve.n)); }
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 bool VerifySignature_SM2(ECPoint publicKey, BigInteger e, BigInteger[] signature) { if (!ECCMath.RangeBetween(signature[0], BigInteger.One, ECCurve.n - 1)) { return(false); } if (!ECCMath.RangeBetween(signature[1], BigInteger.One, ECCurve.n - 1)) { return(false); } BigInteger t = ECCMath.MathMod((signature[0] + signature[1]), ECCurve.n); if (t.IsZero) { return(false); } ECPoint point = ECCMath.PointAdd(ECCMath.ScalarMult(signature[1], ECCurve.G), ECCMath.ScalarMult(t, publicKey)); BigInteger R = ECCMath.MathMod((e + point.X), ECCurve.n); return(R == signature[0]); }
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); }