起因是对接一个接口他们只能提供java deom c#的没有，百度了一天不能适配，只能看java 还原的C#。

代码

public class SM2CryptoUtil{public SM2CryptoUtil(string pubkey, string privkey, Mode mode = Mode.C1C2C3, bool isPkcs8 = false){if (pubkey != null)this.pubkey = pubkey;if (privkey != null)this.privkey = privkey;this.mode = mode;}string pubkey;string privkey;Mode mode;ICipherParameters _privateKeyParameters;ICipherParameters PrivateKeyParameters{get{try{var r = _privateKeyParameters;if (r == null) r = _privateKeyParameters =new ECPrivateKeyParameters(new BigInteger(privkey, 16),new ECDomainParameters(GMNamedCurves.GetByName("SM2P256V1")));return r;}catch (Exception ex){return null;}}}ICipherParameters _publicKeyParameters;ICipherParameters PublicKeyParameters{get{try{var r = _publicKeyParameters;if (r == null){//截取64字节有效的SM2公钥（如果公钥首个字节为0x04）if (pubkey.Length > 128){pubkey = pubkey.Substring(pubkey.Length - 128);}//将公钥拆分为x,y分量（各32字节）String stringX = pubkey.Substring(0, 64);String stringY = pubkey.Substring(stringX.Length);//将公钥x、y分量转换为BigInteger类型BigInteger x = new BigInteger(stringX, 16);BigInteger y = new BigInteger(stringY, 16);//通过公钥x、y分量创建椭圆曲线公钥规范var x9ec = GMNamedCurves.GetByName("SM2P256V1");r = _publicKeyParameters = new ECPublicKeyParameters(x9ec.Curve.CreatePoint(x,y),new ECDomainParameters(x9ec));}return r;}catch (Exception ex){return null;;}}}public byte[] Decrypt(byte[] data){try{if (mode == Mode.C1C3C2)data = C132ToC123(data);var sm2 = new SM2Engine();sm2.Init(false, this.PrivateKeyParameters);return sm2.ProcessBlock(data, 0, data.Length);}catch (Exception ex) {return null;}}public byte[] Encrypt(byte[] data){try{//  var sm2 = new SM2Engine(new SM3Digest());var sm2 = new SM2Engine();sm2.Init(true, new ParametersWithRandom(this.PublicKeyParameters));data = sm2.ProcessBlock(data, 0, data.Length);if (mode == Mode.C1C3C2) data = C123ToC132(data);return data;}catch (Exception ex) {return null;}}static byte[] C123ToC132(byte[] c1c2c3){var gn = GMNamedCurves.GetByName("SM2P256V1");int c1Len = (gn.Curve.FieldSize + 7) / 8 * 2 + 1;int c3Len = 32;byte[] result = new byte[c1c2c3.Length];Array.Copy(c1c2c3, 0, result, 0, c1Len); //c1Array.Copy(c1c2c3, c1c2c3.Length - c3Len, result, c1Len, c3Len); //c3Array.Copy(c1c2c3, c1Len, result, c1Len + c3Len, c1c2c3.Length - c1Len - c3Len); //c2return result;}static byte[] C132ToC123(byte[] c1c3c2){var gn = GMNamedCurves.GetByName("SM2P256V1");int c1Len = (gn.Curve.FieldSize + 7) / 8 * 2 + 1;int c3Len = 32;byte[] result = new byte[c1c3c2.Length];Array.Copy(c1c3c2, 0, result, 0, c1Len); //c1: 0->65Array.Copy(c1c3c2, c1Len + c3Len, result, c1Len, c1c3c2.Length - c1Len - c3Len); //c2Array.Copy(c1c3c2, c1Len, result, c1c3c2.Length - c3Len, c3Len); //c3return result;}public enum Mode{C1C2C3, C1C3C2}}

调用方式

//实例化string pukey="";string PRKEY="";var handle = new SM2CryptoUtil(pukey, PRKEY, SM2CryptoUtil.Mode.C1C3C2);
//加密
string str="";
var Encryptdata = handle.Encrypt(System.Text.Encoding.UTF8.GetBytes(str));
string datac = Hex.ToHexString(Encryptdata);
//解密
string str="";
var original = handle.Decrypt(Hex.Decode(str));
string data = System.Text.Encoding.Default.GetString(original);

如果不能用请留言
苦逼呀！！！

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