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.ASCII.GetString(Hex.Encode(encryptedData));
byte[] c1Bytes = Hex.Decode(Encoding.ASCII.GetBytes(data.Substring(0, 130)));
int c2Len = encryptedData.Length - 97;
byte[] c2 = Hex.Decode(Encoding.ASCII.GetBytes(data.Substring(130, 2 * c2Len)));
byte[] c3 = Hex.Decode(Encoding.ASCII.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);
}
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.ASCII.GetString(Hex.Encode(c1.GetEncoded()));
String sc2 = Encoding.ASCII.GetString(Hex.Encode(source));
String sc3 = Encoding.ASCII.GetString(Hex.Encode(c3));
return((sc1 + sc2 + sc3).ToUpper());
}
public static void GenerateKeyPair()
{
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;
System.Console.Out.WriteLine("公钥: " + Encoding.ASCII.GetString(Hex.Encode(publicKey.GetEncoded())).ToUpper());
System.Console.Out.WriteLine("私钥: " + Encoding.ASCII.GetString(Hex.Encode(privateKey.ToByteArray())).ToUpper());
}
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);
}