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.EccCurve.DecodePoint(publicKey);
ECPoint c1 = cipher.InitEnc(sm2, userKey);
cipher.Encrypt(source);
byte[] c3 = new byte[32];
cipher.Dofinal(c3);
String sc1 = Encoding.Default.GetString(Hex.Encode(c1.GetEncoded()));
String sc2 = Encoding.Default.GetString(Hex.Encode(source));
String sc3 = Encoding.Default.GetString(Hex.Encode(c3));
return((sc1 + sc2 + sc3).ToUpper());
}
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.Default.GetString(Hex.Encode(encryptedData));
byte[] c1Bytes = Hex.Decode(Encoding.Default.GetBytes(data.Substring(0, 130)));
int c2Len = encryptedData.Length - 97;
byte[] c2 = Hex.Decode(Encoding.Default.GetBytes(data.Substring(130, 2 * c2Len)));
byte[] c3 = Hex.Decode(Encoding.Default.GetBytes(data.Substring(130 + 2 * c2Len, 64)));
SM2 sm2 = SM2.Instance;
BigInteger userD = new BigInteger(1, privateKey);
ECPoint c1 = sm2.EccCurve.DecodePoint(c1Bytes);
Cipher cipher = new Cipher();
cipher.InitDec(userD, c1);
cipher.Decrypt(c2);
cipher.Dofinal(c3);
return(c2);
}
public static Tuple <string, string> GenerateKeyPair()
{
SM2 sm2 = SM2.Instance;
AsymmetricCipherKeyPair key = sm2.EccKeyPairGenerator.GenerateKeyPair();
ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters)key.Private;
ECPublicKeyParameters ecpub = (ECPublicKeyParameters)key.Public;
var privateKey = ecpriv.D;
var publicKey = ecpub.Q;
return(new Tuple <string, string>(
Encoding.Default.GetString(Hex.Encode(publicKey.GetEncoded())).ToUpper(),
Encoding.Default.GetString(Hex.Encode(privateKey.ToByteArray())).ToUpper()));
}
public virtual ECPoint InitEnc(SM2 sm2, ECPoint userKey)
{
AsymmetricCipherKeyPair key = sm2.EccKeyPairGenerator.GenerateKeyPair();
ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters)key.Private;
ECPublicKeyParameters ecpub = (ECPublicKeyParameters)key.Public;
BigInteger k = ecpriv.D;
ECPoint c1 = ecpub.Q;
p2 = userKey.Multiply(k);
Reset();
return(c1);
}
