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| public class EncryptionUtils { static string _AES_SECRET_KEY = "9FCA07E906FB465EAF42558CB1A2F3E3"; public static string AesEncrypt(string plaintext) { if (plaintext == null) return null; byte[] keyBytes = Encoding.UTF8.GetBytes(_AES_SECRET_KEY); using (System.Security.Cryptography.Aes aes = System.Security.Cryptography.Aes.Create()) { aes.Key = keyBytes; aes.GenerateIV(); System.Security.Cryptography.ICryptoTransform encryptor = aes.CreateEncryptor(); byte[] plaintextBytes = Encoding.UTF8.GetBytes(plaintext); byte[] ciphertextBytes = encryptor.TransformFinalBlock(plaintextBytes, 0, plaintextBytes.Length); byte[] combinedBytes = new byte[aes.IV.Length + ciphertextBytes.Length]; Array.Copy(aes.IV, 0, combinedBytes, 0, aes.IV.Length); Array.Copy(ciphertextBytes, 0, combinedBytes, aes.IV.Length, ciphertextBytes.Length); return Convert.ToBase64String(combinedBytes); } }
public static string AesDecrypt(string ciphertext) { if(ciphertext == null) return null; byte[] keyBytes = Encoding.UTF8.GetBytes(_AES_SECRET_KEY); byte[] combinedBytes = Convert.FromBase64String(ciphertext); byte[] ivBytes = new byte[16]; byte[] ciphertextBytes = new byte[combinedBytes.Length - ivBytes.Length]; Array.Copy(combinedBytes, ivBytes, ivBytes.Length); Array.Copy(combinedBytes, ivBytes.Length, ciphertextBytes, 0, ciphertextBytes.Length); using (System.Security.Cryptography.Aes aes = System.Security.Cryptography.Aes.Create()) { aes.Key = keyBytes; aes.IV = ivBytes; System.Security.Cryptography.ICryptoTransform decryptor = aes.CreateDecryptor(); byte[] plaintextBytes = decryptor.TransformFinalBlock(ciphertextBytes, 0, ciphertextBytes.Length); return Encoding.UTF8.GetString(plaintextBytes); } }
public static string SM2Encrypt(string publickey, string sourceData) { string ciphertext = SM2CryptoUtils.Encrypt(publickey, sourceData); return ciphertext; }
private class SM2CryptoUtils { #region 获取公钥私钥 public static SM2Model GetKey() { SM2 sm2 = SM2.Instance; AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.GenerateKeyPair(); ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters)key.Private; ECPublicKeyParameters ecpub = (ECPublicKeyParameters)key.Public; BigInteger privateKey = ecpriv.D; ECPoint publicKey = ecpub.Q; SM2Model sM2Model = new SM2Model(); sM2Model.PrivateKey = Encoding.UTF8.GetString(Hex.Encode(privateKey.ToByteArray())).ToUpper(); sM2Model.PublicKey = Encoding.UTF8.GetString(Hex.Encode(publicKey.GetEncoded())).ToUpper(); return sM2Model; } #endregion
#region 加密 public static string Encrypt(string publickey, string sourceData) { var data = Encrypt(Hex.Decode(publickey), Encoding.UTF8.GetBytes(sourceData)); return data; }
public static String Encrypt(byte[] publicKey, byte[] data) { if (null == publicKey || publicKey.Length == 0) { return null; } if (data == null || data.Length == 0) { return null; }
byte[] source = new byte[data.Length]; Array.Copy(data, 0, source, 0, data.Length);
Cipher cipher = new Cipher(); SM2 sm2 = SM2.Instance;
ECPoint userKey = sm2.ecc_curve.DecodePoint(publicKey);
ECPoint c1 = cipher.Init_enc(sm2, userKey); cipher.Encrypt(source);
byte[] c3 = new byte[32]; cipher.Dofinal(c3);
String sc1 = Encoding.UTF8.GetString(Hex.Encode(c1.GetEncoded())); String sc2 = Encoding.UTF8.GetString(Hex.Encode(source)); String sc3 = Encoding.UTF8.GetString(Hex.Encode(c3));
return (sc1 + sc3 + sc2).ToUpper(); } #endregion
#region 解密
public static string Decrypt(string privateKey, string encryptedData) { var data = Encoding.UTF8.GetString(Decrypt(Hex.Decode(privateKey), Hex.Decode(encryptedData))); return data; } public static byte[] Decrypt(byte[] privateKey, byte[] encryptedData) { if (null == privateKey || privateKey.Length == 0) { return null; } if (encryptedData == null || encryptedData.Length == 0) { return null; }
String data = Encoding.UTF8.GetString(Hex.Encode(encryptedData));
byte[] c1Bytes = Hex.Decode(Encoding.UTF8.GetBytes(data.Substring(0, 130))); int c2Len = encryptedData.Length - 97; byte[] c2 = Hex.Decode(Encoding.UTF8.GetBytes(data.Substring(130, 2 * c2Len))); byte[] c3 = Hex.Decode(Encoding.UTF8.GetBytes(data.Substring(130 + 2 * c2Len, 64)));
SM2 sm2 = SM2.Instance; BigInteger userD = new BigInteger(1, privateKey);
ECPoint c1 = sm2.ecc_curve.DecodePoint(c1Bytes); Cipher cipher = new Cipher(); cipher.Init_dec(userD, c1); cipher.Decrypt(c2); cipher.Dofinal(c3);
return c2; } #endregion
private class Cipher { private int ct; private ECPoint p2; private SM3Digest sm3keybase; private SM3Digest sm3c3; private byte[] key; private byte keyOff;
public Cipher() { this.ct = 1; this.key = new byte[32]; this.keyOff = 0; }
public static byte[] byteConvert32Bytes(BigInteger n) { byte[] tmpd = null; if (n == null) { return null; }
if (n.ToByteArray().Length == 33) { tmpd = new byte[32]; Array.Copy(n.ToByteArray(), 1, tmpd, 0, 32); } else if (n.ToByteArray().Length == 32) { tmpd = n.ToByteArray(); } else { tmpd = new byte[32]; for (int i = 0; i < 32 - n.ToByteArray().Length; i++) { tmpd[i] = 0; } Array.Copy(n.ToByteArray(), 0, tmpd, 32 - n.ToByteArray().Length, n.ToByteArray().Length); } return tmpd; }
private void Reset() { this.sm3keybase = new SM3Digest(); this.sm3c3 = new SM3Digest();
byte[] p = byteConvert32Bytes(p2.Normalize().XCoord.ToBigInteger()); this.sm3keybase.BlockUpdate(p, 0, p.Length); this.sm3c3.BlockUpdate(p, 0, p.Length);
p = byteConvert32Bytes(p2.Normalize().YCoord.ToBigInteger()); this.sm3keybase.BlockUpdate(p, 0, p.Length); this.ct = 1; NextKey(); }
private void NextKey() { SM3Digest sm3keycur = new SM3Digest(this.sm3keybase); sm3keycur.Update((byte)(ct >> 24 & 0xff)); sm3keycur.Update((byte)(ct >> 16 & 0xff)); sm3keycur.Update((byte)(ct >> 8 & 0xff)); sm3keycur.Update((byte)(ct & 0xff)); sm3keycur.DoFinal(key, 0); this.keyOff = 0; this.ct++; }
public ECPoint Init_enc(SM2 sm2, ECPoint userKey) { AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.GenerateKeyPair(); ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters)key.Private; ECPublicKeyParameters ecpub = (ECPublicKeyParameters)key.Public; BigInteger k = ecpriv.D; ECPoint c1 = ecpub.Q; this.p2 = userKey.Multiply(k); Reset(); return c1; }
public void Encrypt(byte[] data) { this.sm3c3.BlockUpdate(data, 0, data.Length); for (int i = 0; i < data.Length; i++) { if (keyOff == key.Length) { NextKey(); } data[i] ^= key[keyOff++]; } }
public void Init_dec(BigInteger userD, ECPoint c1) { this.p2 = c1.Multiply(userD); Reset(); }
public void Decrypt(byte[] data) { for (int i = 0; i < data.Length; i++) { if (keyOff == key.Length) { NextKey(); } data[i] ^= key[keyOff++]; }
this.sm3c3.BlockUpdate(data, 0, data.Length); }
public void Dofinal(byte[] c3) { byte[] p = byteConvert32Bytes(p2.Normalize().YCoord.ToBigInteger()); this.sm3c3.BlockUpdate(p, 0, p.Length); this.sm3c3.DoFinal(c3, 0); Reset(); } } private class SM2 { public static SM2 Instance { get { return new SM2(); }
} public static SM2 InstanceTest { get { return new SM2(); }
}
public static readonly string[] sm2_param = { "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF", "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC", "28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93", "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123", "32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7", "BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0" };
public string[] ecc_param = sm2_param;
public readonly BigInteger ecc_p; public readonly BigInteger ecc_a; public readonly BigInteger ecc_b; public readonly BigInteger ecc_n; public readonly BigInteger ecc_gx; public readonly BigInteger ecc_gy;
public readonly ECCurve ecc_curve; public readonly ECPoint ecc_point_g;
public readonly ECDomainParameters ecc_bc_spec;
public readonly ECKeyPairGenerator ecc_key_pair_generator;
private SM2() { ecc_param = sm2_param;
ECFieldElement ecc_gx_fieldelement; ECFieldElement ecc_gy_fieldelement;
ecc_p = new BigInteger(ecc_param[0], 16); ecc_a = new BigInteger(ecc_param[1], 16); ecc_b = new BigInteger(ecc_param[2], 16); ecc_n = new BigInteger(ecc_param[3], 16); ecc_gx = new BigInteger(ecc_param[4], 16); ecc_gy = new BigInteger(ecc_param[5], 16);
ecc_gx_fieldelement = new FpFieldElement(ecc_p, ecc_gx); ecc_gy_fieldelement = new FpFieldElement(ecc_p, ecc_gy);
ecc_curve = new FpCurve(ecc_p, ecc_a, ecc_b); ecc_point_g = new FpPoint(ecc_curve, ecc_gx_fieldelement, ecc_gy_fieldelement);
ecc_bc_spec = new ECDomainParameters(ecc_curve, ecc_point_g, ecc_n);
ECKeyGenerationParameters ecc_ecgenparam; ecc_ecgenparam = new ECKeyGenerationParameters(ecc_bc_spec, new SecureRandom());
ecc_key_pair_generator = new ECKeyPairGenerator(); ecc_key_pair_generator.Init(ecc_ecgenparam); }
public virtual byte[] Sm2GetZ(byte[] userId, ECPoint userKey) { SM3Digest sm3 = new SM3Digest(); byte[] p; int len = userId.Length * 8; sm3.Update((byte)(len >> 8 & 0x00ff)); sm3.Update((byte)(len & 0x00ff));
sm3.BlockUpdate(userId, 0, userId.Length);
p = ecc_a.ToByteArray(); sm3.BlockUpdate(p, 0, p.Length); p = ecc_b.ToByteArray(); sm3.BlockUpdate(p, 0, p.Length); p = ecc_gx.ToByteArray(); sm3.BlockUpdate(p, 0, p.Length); p = ecc_gy.ToByteArray(); sm3.BlockUpdate(p, 0, p.Length);
p = userKey.AffineXCoord.ToBigInteger().ToByteArray(); sm3.BlockUpdate(p, 0, p.Length); p = userKey.AffineYCoord.ToBigInteger().ToByteArray(); sm3.BlockUpdate(p, 0, p.Length);
byte[] md = new byte[sm3.GetDigestSize()]; sm3.DoFinal(md, 0);
return md; } } public class SM2Model { public string PublicKey { get; set; } public string PrivateKey { get; set; } } } }
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