C#.NET 国密SM2 加密解密 与JAVA互通 ver:20230805
.NET 环境：.NET6 控制台程序(.net core)。
JAVA 环境：JAVA8，带maven 的JAVA控制台程序。
简要解析：
1.最好要到对方源码(DEMO+JAR包也可以)，可以用IDEA反编译（Ctrl+鼠标左键），看它过程逻辑和加密结果格式。
2.加密结果顺序：早期是 C1C2C3，后期是C1C3C2 ，双方得约定好。
3.加密结果：BASE64字符串或16进制字符串 ，双方得约定好。
4. .NET BC库SM2加密结果会带04，如果JAVA 那边报 Invalid point encoding 错误，删除加密结果前的04。如果对方要的是BASE64的加密结果，我们可以先转16进制字符串，裁掉04，再转BASE64。
string newCipherText = Hex.ToHexString(bysm2keyEncrypted);
if (newCipherText.StartsWith("04"))
{
newCipherText = newCipherText.Substring(2);
}
5. .NET BC库解密，密文前要加 “04”，否则会报 Invalid point encoding XX 。如果加密结果是BASE64的，先把BASE64转16进制字符串，再判断是否04开头。
如果JAVA源码，固定截取的头2位，那么就不用判断是否04开头了，直接写死：javaSM2 = "04" + javaSM2;
生成一组国密公私钥：
私钥：FAB8BBE670FAE338C9E9382B9FB6485225C11A3ECB84C938F10F20A93B6215F0
公钥：049EF573019D9A03B16B0BE44FC8A5B4E8E098F56034C97B312282DD0B4810AFC3CC759673ED0FC9B9DC7E6FA38F0E2B121E02654BF37EA6B63FAF2A0D6013EADF
本例是：C1C3C2。
//GmUtil.Sm2Encrypt 对应 C1C3C2
// GmUtil.Sm2EncryptOld ：C1C2C3
.NET 代码：
GmUtil 工具类，需要nuget下载 Portable.BouncyCastle 1.9.0 版本：
using Org.BouncyCastle.Asn1; using Org.BouncyCastle.Asn1.GM; using Org.BouncyCastle.Asn1.X9; using Org.BouncyCastle.Crypto; using Org.BouncyCastle.Crypto.Digests; using Org.BouncyCastle.Crypto.Engines; using Org.BouncyCastle.Crypto.Generators; using Org.BouncyCastle.Crypto.Parameters; using Org.BouncyCastle.Math; using Org.BouncyCastle.Security; using Org.BouncyCastle.Utilities; using Org.BouncyCastle.Utilities.Encoders; using Org.BouncyCastle.X509; using System; using System.Collections.Generic; using System.IO; namespace CommonUtils { /** * need lib: * BouncyCastle.Crypto.dll（http://www.bouncycastle.org/csharp/index.html） * 用BC的注意点： * 这个版本的BC对SM3withSM2的结果为asn1格式的r和s，如果需要直接拼接的r||s需要自己转换。下面rsAsn1ToPlainByteArray、rsPlainByteArrayToAsn1就在干这事。 * 这个版本的BC对SM2的结果为C1||C2||C3，据说为旧标准，新标准为C1||C3||C2，用新标准的需要自己转换。下面（被注释掉的）changeC1C2C3ToC1C3C2、changeC1C3C2ToC1C2C3就在干这事。java版的高版本有加上C1C3C2，csharp版没准以后也会加，但目前还没有，java版的目前可以初始化时“ SM2Engine sm2Engine = new SM2Engine(SM2Engine.Mode.C1C3C2);”。 * * 按要求国密算法仅允许使用加密机，本demo国密算法仅供学习使用，请不要用于生产用途。 */ public class GmUtil { //private static readonly ILog log = LogManager.GetLogger(typeof(GmUtil)); private static X9ECParameters x9ECParameters = GMNamedCurves.GetByName("sm2p256v1"); private static ECDomainParameters ecDomainParameters = new ECDomainParameters(x9ECParameters.Curve, x9ECParameters.G, x9ECParameters.N); /** * * @param msg * @param userId * @param privateKey * @return r||s，直接拼接byte数组的rs */ public static byte[] SignSm3WithSm2(byte[] msg, byte[] userId, AsymmetricKeyParameter privateKey) { return RsAsn1ToPlainByteArray(SignSm3WithSm2Asn1Rs(msg, userId, privateKey)); } /** * @param msg * @param userId * @param privateKey * @return rs in <b>asn1 format</b> */ public static byte[] SignSm3WithSm2Asn1Rs(byte[] msg, byte[] userId, AsymmetricKeyParameter privateKey) { try { ISigner signer = SignerUtilities.GetSigner("SM3withSM2"); signer.Init(true, new ParametersWithID(privateKey, userId)); signer.BlockUpdate(msg, 0, msg.Length); byte[] sig = signer.GenerateSignature(); return sig; } catch (Exception e) { //log.Error("SignSm3WithSm2Asn1Rs error: " + e.Message, e); return null; } } /** * * @param msg * @param userId * @param rs r||s，直接拼接byte数组的rs * @param publicKey * @return */ public static bool VerifySm3WithSm2(byte[] msg, byte[] userId, byte[] rs, AsymmetricKeyParameter publicKey) { if (rs == null || msg == null || userId == null) return false; if (rs.Length != RS_LEN * 2) return false; return VerifySm3WithSm2Asn1Rs(msg, userId, RsPlainByteArrayToAsn1(rs), publicKey); } /** * * @param msg * @param userId * @param rs in <b>asn1 format</b> * @param publicKey * @return */ public static bool VerifySm3WithSm2Asn1Rs(byte[] msg, byte[] userId, byte[] sign, AsymmetricKeyParameter publicKey) { try { ISigner signer = SignerUtilities.GetSigner("SM3withSM2"); signer.Init(false, new ParametersWithID(publicKey, userId)); signer.BlockUpdate(msg, 0, msg.Length); return signer.VerifySignature(sign); } catch (Exception e) { //log.Error("VerifySm3WithSm2Asn1Rs error: " + e.Message, e); return false; } } /** * bc加解密使用旧标c1||c2||c3，此方法在加密后调用，将结果转化为c1||c3||c2 * @param c1c2c3 * @return */ private static byte[] ChangeC1C2C3ToC1C3C2(byte[] c1c2c3) { int c1Len = (x9ECParameters.Curve.FieldSize + 7) / 8 * 2 + 1; //sm2p256v1的这个固定65。可看GMNamedCurves、ECCurve代码。 const int c3Len = 32; //new SM3Digest().getDigestSize(); byte[] result = new byte[c1c2c3.Length]; Buffer.BlockCopy(c1c2c3, 0, result, 0, c1Len); //c1 Buffer.BlockCopy(c1c2c3, c1c2c3.Length - c3Len, result, c1Len, c3Len); //c3 Buffer.BlockCopy(c1c2c3, c1Len, result, c1Len + c3Len, c1c2c3.Length - c1Len - c3Len); //c2 return result; } /** * bc加解密使用旧标c1||c3||c2，此方法在解密前调用，将密文转化为c1||c2||c3再去解密 * @param c1c3c2 * @return */ private static byte[] ChangeC1C3C2ToC1C2C3(byte[] c1c3c2) { int c1Len = (x9ECParameters.Curve.FieldSize + 7) / 8 * 2 + 1; //sm2p256v1的这个固定65。可看GMNamedCurves、ECCurve代码。 const int c3Len = 32; //new SM3Digest().GetDigestSize(); byte[] result = new byte[c1c3c2.Length]; Buffer.BlockCopy(c1c3c2, 0, result, 0, c1Len); //c1: 0->65 Buffer.BlockCopy(c1c3c2, c1Len + c3Len, result, c1Len, c1c3c2.Length - c1Len - c3Len); //c2 Buffer.BlockCopy(c1c3c2, c1Len, result, c1c3c2.Length - c3Len, c3Len); //c3 return result; } /** * c1||c3||c2 * @param data * @param key * @return */ public static byte[] Sm2Decrypt(byte[] data, AsymmetricKeyParameter key) { return Sm2DecryptOld(ChangeC1C3C2ToC1C2C3(data), key); } /** * c1||c3||c2 * @param data * @param key * @return */ public static byte[] Sm2Encrypt(byte[] data, AsymmetricKeyParameter key) { return ChangeC1C2C3ToC1C3C2(Sm2EncryptOld(data, key)); } /** * c1||c2||c3 * @param data * @param key * @return */ public static byte[] Sm2EncryptOld(byte[] data, AsymmetricKeyParameter pubkey) { try { SM2Engine sm2Engine = new SM2Engine(); sm2Engine.Init(true, new ParametersWithRandom(pubkey, new SecureRandom())); return sm2Engine.ProcessBlock(data, 0, data.Length); } catch (Exception e) { //log.Error("Sm2EncryptOld error: " + e.Message, e); return null; } } /** * c1||c2||c3 * @param data * @param key * @return */ public static byte[] Sm2DecryptOld(byte[] data, AsymmetricKeyParameter key) { try { SM2Engine sm2Engine = new SM2Engine(); sm2Engine.Init(false, key); return sm2Engine.ProcessBlock(data, 0, data.Length); } catch (Exception e) { //log.Error("Sm2DecryptOld error: " + e.Message, e); return null; } } /** * @param bytes * @return */ public static byte[] Sm3(byte[] bytes) { try { SM3Digest digest = new SM3Digest(); digest.BlockUpdate(bytes, 0, bytes.Length); byte[] result = DigestUtilities.DoFinal(digest); return result; } catch (Exception e) { //log.Error("Sm3 error: " + e.Message, e); return null; } } private const int RS_LEN = 32; private static byte[] BigIntToFixexLengthBytes(BigInteger rOrS) { // for sm2p256v1, n is 00fffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123, // r and s are the result of mod n, so they should be less than n and have length<=32 byte[] rs = rOrS.ToByteArray(); if (rs.Length == RS_LEN) return rs; else if (rs.Length == RS_LEN + 1 && rs[0] == 0) return Arrays.CopyOfRange(rs, 1, RS_LEN + 1); else if (rs.Length < RS_LEN) { byte[] result = new byte[RS_LEN]; Arrays.Fill(result, (byte)0); Buffer.BlockCopy(rs, 0, result, RS_LEN - rs.Length, rs.Length); return result; } else { throw new ArgumentException("err rs: " + Hex.ToHexString(rs)); } } /** * BC的SM3withSM2签名得到的结果的rs是asn1格式的，这个方法转化成直接拼接r||s * @param rsDer rs in asn1 format * @return sign result in plain byte array */ private static byte[] RsAsn1ToPlainByteArray(byte[] rsDer) { Asn1Sequence seq = Asn1Sequence.GetInstance(rsDer); byte[] r = BigIntToFixexLengthBytes(DerInteger.GetInstance(seq[0]).Value); byte[] s = BigIntToFixexLengthBytes(DerInteger.GetInstance(seq[1]).Value); byte[] result = new byte[RS_LEN * 2]; Buffer.BlockCopy(r, 0, result, 0, r.Length); Buffer.BlockCopy(s, 0, result, RS_LEN, s.Length); return result; } /** * BC的SM3withSM2验签需要的rs是asn1格式的，这个方法将直接拼接r||s的字节数组转化成asn1格式 * @param sign in plain byte array * @return rs result in asn1 format */ private static byte[] RsPlainByteArrayToAsn1(byte[] sign) { if (sign.Length != RS_LEN * 2) throw new ArgumentException("err rs. "); BigInteger r = new BigInteger(1, Arrays.CopyOfRange(sign, 0, RS_LEN)); BigInteger s = new BigInteger(1, Arrays.CopyOfRange(sign, RS_LEN, RS_LEN * 2)); Asn1EncodableVector v = new Asn1EncodableVector(); v.Add(new DerInteger(r)); v.Add(new DerInteger(s)); try { return new DerSequence(v).GetEncoded("DER"); } catch (IOException e) { //log.Error("RsPlainByteArrayToAsn1 error: " + e.Message, e); return null; } } public static AsymmetricCipherKeyPair GenerateKeyPair() { try { ECKeyPairGenerator kpGen = new ECKeyPairGenerator(); kpGen.Init(new ECKeyGenerationParameters(ecDomainParameters, new SecureRandom())); return kpGen.GenerateKeyPair(); } catch (Exception e) { //log.Error("generateKeyPair error: " + e.Message, e); return null; } } public static ECPrivateKeyParameters GetPrivatekeyFromD(BigInteger d) { return new ECPrivateKeyParameters(d, ecDomainParameters); } public static ECPublicKeyParameters GetPublickeyFromXY(BigInteger x, BigInteger y) { return new ECPublicKeyParameters(x9ECParameters.Curve.CreatePoint(x, y), ecDomainParameters); } public static AsymmetricKeyParameter GetPublickeyFromX509File(FileInfo file) { FileStream fileStream = null; try { //file.DirectoryName + "\\" + file.Name fileStream = new FileStream(file.FullName, FileMode.Open, FileAccess.Read); X509Certificate certificate = new X509CertificateParser().ReadCertificate(fileStream); return certificate.GetPublicKey(); } catch (Exception e) { //log.Error(file.Name + "读取失败，异常：" + e); } finally { if (fileStream != null) fileStream.Close(); } return null; } public class Sm2Cert { public AsymmetricKeyParameter privateKey; public AsymmetricKeyParameter publicKey; public String certId; } private static byte[] ToByteArray(int i) { byte[] byteArray = new byte[4]; byteArray[0] = (byte)(i >> 24); byteArray[1] = (byte)((i & 0xFFFFFF) >> 16); byteArray[2] = (byte)((i & 0xFFFF) >> 8); byteArray[3] = (byte)(i & 0xFF); return byteArray; } /** * 字节数组拼接 * * @param params * @return */ private static byte[] Join(params byte[][] byteArrays) { List<byte> byteSource = new List<byte>(); for (int i = 0; i < byteArrays.Length; i++) { byteSource.AddRange(byteArrays[i]); } byte[] data = byteSource.ToArray(); return data; } /** * 密钥派生函数 * * @param Z * @param klen * 生成klen字节数长度的密钥 * @return */ private static byte[] KDF(byte[] Z, int klen) { int ct = 1; int end = (int)Math.Ceiling(klen * 1.0 / 32); List<byte> byteSource = new List<byte>(); try { for (int i = 1; i < end; i++) { byteSource.AddRange(GmUtil.Sm3(Join(Z, ToByteArray(ct)))); ct++; } byte[] last = GmUtil.Sm3(Join(Z, ToByteArray(ct))); if (klen % 32 == 0) { byteSource.AddRange(last); } else byteSource.AddRange(Arrays.CopyOfRange(last, 0, klen % 32)); return byteSource.ToArray(); } catch (Exception e) { //log.Error("KDF error: " + e.Message, e); } return null; } public static byte[] Sm4DecryptCBC(byte[] keyBytes, byte[] cipher, byte[] iv, String algo) { if (keyBytes.Length != 16) throw new ArgumentException("err key length"); if (cipher.Length % 16 != 0 && algo.Contains("NoPadding")) throw new ArgumentException("err data length"); try { KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes); IBufferedCipher c = CipherUtilities.GetCipher(algo); if (iv == null) iv = ZeroIv(algo); c.Init(false, new ParametersWithIV(key, iv)); return c.DoFinal(cipher); } catch (Exception e) { //log.Error("Sm4DecryptCBC error: " + e.Message, e); return null; } } public static byte[] Sm4EncryptCBC(byte[] keyBytes, byte[] plain, byte[] iv, String algo) { if (keyBytes.Length != 16) throw new ArgumentException("err key length"); if (plain.Length % 16 != 0 && algo.Contains("NoPadding")) throw new ArgumentException("err data length"); try { KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes); IBufferedCipher c = CipherUtilities.GetCipher(algo); if (iv == null) iv = ZeroIv(algo); c.Init(true, new ParametersWithIV(key, iv)); return c.DoFinal(plain); } catch (Exception e) { //log.Error("Sm4EncryptCBC error: " + e.Message, e); return null; } } public static byte[] Sm4EncryptECB(byte[] keyBytes, byte[] plain, string algo) { if (keyBytes.Length != 16) throw new ArgumentException("err key length"); //NoPadding 的情况下需要校验数据长度是16的倍数. if (plain.Length % 16 != 0 && algo.Contains("NoPadding")) throw new ArgumentException("err data length"); try { KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes); IBufferedCipher c = CipherUtilities.GetCipher(algo); c.Init(true, key); return c.DoFinal(plain); } catch (Exception e) { //log.Error("Sm4EncryptECB error: " + e.Message, e); return null; } } public static byte[] Sm4DecryptECB(byte[] keyBytes, byte[] cipher, string algo) { if (keyBytes.Length != 16) throw new ArgumentException("err key length"); if (cipher.Length % 16 != 0 && algo.Contains("NoPadding")) throw new ArgumentException("err data length"); try { KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes); IBufferedCipher c = CipherUtilities.GetCipher(algo); c.Init(false, key); return c.DoFinal(cipher); } catch (Exception e) { //log.Error("Sm4DecryptECB error: " + e.Message, e); return null; } } public const String SM4_ECB_NOPADDING = "SM4/ECB/NoPadding"; public const String SM4_CBC_NOPADDING = "SM4/CBC/NoPadding"; public const String SM4_CBC_PKCS7PADDING = "SM4/CBC/PKCS7Padding"; /** * cfca官网CSP沙箱导出的sm2文件 * @param pem 二进制原文 * @param pwd 密码 * @return */ public static Sm2Cert readSm2File(byte[] pem, String pwd) { Sm2Cert sm2Cert = new Sm2Cert(); try { Asn1Sequence asn1Sequence = (Asn1Sequence)Asn1Object.FromByteArray(pem); // ASN1Integer asn1Integer = (ASN1Integer) asn1Sequence.getObjectAt(0); //version=1 Asn1Sequence priSeq = (Asn1Sequence)asn1Sequence[1];//private key Asn1Sequence pubSeq = (Asn1Sequence)asn1Sequence[2];//public key and x509 cert // ASN1ObjectIdentifier sm2DataOid = (ASN1ObjectIdentifier) priSeq.getObjectAt(0); // ASN1ObjectIdentifier sm4AlgOid = (ASN1ObjectIdentifier) priSeq.getObjectAt(1); Asn1OctetString priKeyAsn1 = (Asn1OctetString)priSeq[2]; byte[] key = KDF(System.Text.Encoding.UTF8.GetBytes(pwd), 32); byte[] priKeyD = Sm4DecryptCBC(Arrays.CopyOfRange(key, 16, 32), priKeyAsn1.GetOctets(), Arrays.CopyOfRange(key, 0, 16), SM4_CBC_PKCS7PADDING); sm2Cert.privateKey = GetPrivatekeyFromD(new BigInteger(1, priKeyD)); // log.Info(Hex.toHexString(priKeyD)); // ASN1ObjectIdentifier sm2DataOidPub = (ASN1ObjectIdentifier) pubSeq.getObjectAt(0); Asn1OctetString pubKeyX509 = (Asn1OctetString)pubSeq[1]; X509Certificate x509 = (X509Certificate)new X509CertificateParser().ReadCertificate(pubKeyX509.GetOctets()); sm2Cert.publicKey = x509.GetPublicKey(); sm2Cert.certId = x509.SerialNumber.ToString(10); //这里转10进账，有啥其他进制要求的自己改改 return sm2Cert; } catch (Exception e) { //log.Error("readSm2File error: " + e.Message, e); return null; } } /** * * @param cert * @return */ public static Sm2Cert ReadSm2X509Cert(byte[] cert) { Sm2Cert sm2Cert = new Sm2Cert(); try { X509Certificate x509 = new X509CertificateParser().ReadCertificate(cert); sm2Cert.publicKey = x509.GetPublicKey(); sm2Cert.certId = x509.SerialNumber.ToString(10); //这里转10进账，有啥其他进制要求的自己改改 return sm2Cert; } catch (Exception e) { //log.Error("ReadSm2X509Cert error: " + e.Message, e); return null; } } public static byte[] ZeroIv(String algo) { try { IBufferedCipher cipher = CipherUtilities.GetCipher(algo); int blockSize = cipher.GetBlockSize(); byte[] iv = new byte[blockSize]; Arrays.Fill(iv, (byte)0); return iv; } catch (Exception e) { //log.Error("ZeroIv error: " + e.Message, e); return null; } } public static void Main2(string[] s) { // 随便看看 //log.Info("GMNamedCurves: "); foreach (string e in GMNamedCurves.Names) { //log.Info(e); } //log.Info("sm2p256v1 n:" + x9ECParameters.N); //log.Info("sm2p256v1 nHex:" + Hex.ToHexString(x9ECParameters.N.ToByteArray())); // 生成公私钥对 --------------------- AsymmetricCipherKeyPair kp = GmUtil.GenerateKeyPair(); //log.Info("private key d: " + ((ECPrivateKeyParameters)kp.Private).D); //log.Info("public key q:" + ((ECPublicKeyParameters)kp.Public).Q); //{x, y, zs...} //签名验签 byte[] msg = System.Text.Encoding.UTF8.GetBytes("message digest"); byte[] userId = System.Text.Encoding.UTF8.GetBytes("userId"); byte[] sig = SignSm3WithSm2(msg, userId, kp.Private); //log.Info("testSignSm3WithSm2: " + Hex.ToHexString(sig)); //log.Info("testVerifySm3WithSm2: " + VerifySm3WithSm2(msg, userId, sig, kp.Public)); // 由d生成私钥 --------------------- BigInteger d = new BigInteger("097b5230ef27c7df0fa768289d13ad4e8a96266f0fcb8de40d5942af4293a54a", 16); ECPrivateKeyParameters bcecPrivateKey = GetPrivatekeyFromD(d); //log.Info("testGetFromD: " + bcecPrivateKey.D.ToString(16)); //公钥X坐标PublicKeyXHex: 59cf9940ea0809a97b1cbffbb3e9d96d0fe842c1335418280bfc51dd4e08a5d4 //公钥Y坐标PublicKeyYHex: 9a7f77c578644050e09a9adc4245d1e6eba97554bc8ffd4fe15a78f37f891ff8 AsymmetricKeyParameter publicKey = GetPublickeyFromX509File(new FileInfo("d:/certs/69629141652.cer")); //log.Info(publicKey); AsymmetricKeyParameter publicKey1 = GetPublickeyFromXY(new BigInteger("59cf9940ea0809a97b1cbffbb3e9d96d0fe842c1335418280bfc51dd4e08a5d4", 16), new BigInteger("9a7f77c578644050e09a9adc4245d1e6eba97554bc8ffd4fe15a78f37f891ff8", 16)); //log.Info("testReadFromX509File: " + ((ECPublicKeyParameters)publicKey).Q); //log.Info("testGetFromXY: " + ((ECPublicKeyParameters)publicKey1).Q); //log.Info("testPubKey: " + publicKey.Equals(publicKey1)); //log.Info("testPubKey: " + ((ECPublicKeyParameters)publicKey).Q.Equals(((ECPublicKeyParameters)publicKey1).Q)); // sm2 encrypt and decrypt test --------------------- AsymmetricCipherKeyPair kp2 = GenerateKeyPair(); AsymmetricKeyParameter publicKey2 = kp2.Public; AsymmetricKeyParameter privateKey2 = kp2.Private; byte[] bs = Sm2Encrypt(System.Text.Encoding.UTF8.GetBytes("s"), publicKey2); //log.Info("testSm2Enc dec: " + Hex.ToHexString(bs)); bs = Sm2Decrypt(bs, privateKey2); //log.Info("testSm2Enc dec: " + System.Text.Encoding.UTF8.GetString(bs)); // sm4 encrypt and decrypt test --------------------- //0123456789abcdeffedcba9876543210 + 0123456789abcdeffedcba9876543210 -> 681edf34d206965e86b3e94f536e4246 byte[] plain = Hex.Decode("0123456789abcdeffedcba98765432100123456789abcdeffedcba98765432100123456789abcdeffedcba9876543210"); byte[] key = Hex.Decode("0123456789abcdeffedcba9876543210"); byte[] cipher = Hex.Decode("595298c7c6fd271f0402f804c33d3f66"); bs = Sm4EncryptECB(key, plain, GmUtil.SM4_ECB_NOPADDING); //log.Info("testSm4EncEcb: " + Hex.ToHexString(bs)); ; bs = Sm4DecryptECB(key, bs, GmUtil.SM4_ECB_NOPADDING); //log.Info("testSm4DecEcb: " + Hex.ToHexString(bs)); //读.sm2文件 String sm2 = "MIIDHQIBATBHBgoqgRzPVQYBBAIBBgcqgRzPVQFoBDDW5/I9kZhObxXE9Vh1CzHdZhIhxn+3byBU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\nVfY6"; bs = Convert.FromBase64String(sm2); String pwd = "cfca1234"; GmUtil.Sm2Cert sm2Cert = GmUtil.readSm2File(bs, pwd); //log.Info("testReadSm2File, pubkey: " + ((ECPublicKeyParameters)sm2Cert.publicKey).Q.ToString()); //log.Info("testReadSm2File, prikey: " + Hex.ToHexString(((ECPrivateKeyParameters)sm2Cert.privateKey).D.ToByteArray())); //log.Info("testReadSm2File, certId: " + sm2Cert.certId); bs = Sm2Encrypt(System.Text.Encoding.UTF8.GetBytes("s"), ((ECPublicKeyParameters)sm2Cert.publicKey)); //log.Info("testSm2Enc dec: " + Hex.ToHexString(bs)); bs = Sm2Decrypt(bs, ((ECPrivateKeyParameters)sm2Cert.privateKey)); //log.Info("testSm2Enc dec: " + System.Text.Encoding.UTF8.GetString(bs)); msg = System.Text.Encoding.UTF8.GetBytes("message digest"); userId = System.Text.Encoding.UTF8.GetBytes("userId"); sig = SignSm3WithSm2(msg, userId, ((ECPrivateKeyParameters)sm2Cert.privateKey)); //log.Info("testSignSm3WithSm2: " + Hex.ToHexString(sig)); //log.Info("testVerifySm3WithSm2: " + VerifySm3WithSm2(msg, userId, sig, ((ECPublicKeyParameters)sm2Cert.publicKey))); } } }
.NET使用：
using CommonUtils; using Org.BouncyCastle.Crypto; using Org.BouncyCastle.Math; using Org.BouncyCastle.Utilities.Encoders; using System.Text; void TestSM2Enc() { String privateKeyHex = "FAB8BBE670FAE338C9E9382B9FB6485225C11A3ECB84C938F10F20A93B6215F0"; //完整公钥128位“9EF573019D9A03B16B0BE44FC8A5B4E8E098F56034C97B312282DD0B4810AFC3CC759673ED0FC9B9DC7E6FA38F0E2B121E02654BF37EA6B63FAF2A0D6013EADF” //完整公钥130位，比128位开头多了04“049EF573019D9A03B16B0BE44FC8A5B4E8E098F56034C97B312282DD0B4810AFC3CC759673ED0FC9B9DC7E6FA38F0E2B121E02654BF37EA6B63FAF2A0D6013EADF” string pubKeyHex = "049EF573019D9A03B16B0BE44FC8A5B4E8E098F56034C97B312282DD0B4810AFC3CC759673ED0FC9B9DC7E6FA38F0E2B121E02654BF37EA6B63FAF2A0D6013EADF"; //如果是130位公钥，.NET 使用的话，把开头的04截取掉。 if (pubKeyHex.Length == 130) { pubKeyHex = pubKeyHex.Substring(2, 128); } //公钥X，前64位 String x = pubKeyHex.Substring(0, 64); //公钥Y，后64位 String y = pubKeyHex.Substring(64); //获取公钥对象 AsymmetricKeyParameter publicKey1 = GmUtil.GetPublickeyFromXY(new BigInteger(x, 16), new BigInteger(y, 16)); String content = "1234泰酷拉NET"; Console.WriteLine("待处理字符串：" + content); //Sm2Encrypt 对应 C1C3C2 // Sm2EncryptOld ：C1C2C3 byte[] digestByte = GmUtil.Sm2Encrypt(Encoding.UTF8.GetBytes(content), publicKey1); string strSM2 = Hex.ToHexString(digestByte); Console.WriteLine("SM2加密后：" + strSM2); // 4. .NET BC库SM2加密结果会带04，如果JAVA 那边报 Invalid point encoding 错误，删除加密结果前的04。如果对方要的是BASE64的加密结果，我们可以先转16进制字符串，裁掉04，再转BASE64。 string newCipherText = Hex.ToHexString(digestByte); if (newCipherText.StartsWith("04")) { newCipherText = newCipherText.Substring(2); } Console.WriteLine("截取04后，加密结果：" + newCipherText); //.NET 自加自解 BigInteger d = new BigInteger(privateKeyHex, 16); //先拿到私钥对象，用ECPrivateKeyParameters 或 AsymmetricKeyParameter 都可以 //ECPrivateKeyParameters bcecPrivateKey = CommonUtils.GmUtil.GetPrivatekeyFromD(d); AsymmetricKeyParameter bcecPrivateKey = CommonUtils.GmUtil.GetPrivatekeyFromD(d); byte[] byToDecrypt = Hex.Decode(strSM2); byte[] byDecrypted = GmUtil.Sm2Decrypt(byToDecrypt, bcecPrivateKey); String strDecrypted = Encoding.UTF8.GetString(byDecrypted); Console.WriteLine("SM2解密后：" + strDecrypted); //JAVA 结果，.NET来解 string javaSM2 = "04a7aaa9fd91aea6f99787ef431e19cb9feecc5bfb97fb445ce529c78c04676f1792e06b3a2814d1bda80bd3f63e530c149fc03911f1b81007dc86cef2c03f30c7fecc8b256272f881a8f2f4e71351c45d5bb27e8531f1e2ea6d55150c88f5026b8783ccef867a510a313178cfd26177"; //.NET BC库解密，密文前要加 “04”，否则会报 Invalid point encoding XX //如果加密结果是BASE64的，把BASE64转16进制字符串，再判断是否04开头。 //如果对方源码，固定截取的头2位，那么就不用判断是否04开头了，直接写死：javaSM2 = "04" + javaSM2; if (!javaSM2.StartsWith("04")) { javaSM2 = "04" + javaSM2; } Console.WriteLine("javaSM2加密结果：" + javaSM2); byToDecrypt = Hex.Decode(javaSM2); byDecrypted = GmUtil.Sm2Decrypt(byToDecrypt, bcecPrivateKey); strDecrypted = Encoding.UTF8.GetString(byDecrypted); Console.WriteLine("java SM2解密后：" + strDecrypted); }
java代码：
maven 引用 ：
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.8.1</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.70</version>
</dependency>
JAVA调用：
package org.example; import cn.hutool.crypto.SmUtil; import cn.hutool.crypto.asymmetric.KeyType; import cn.hutool.crypto.asymmetric.SM2; import org.bouncycastle.crypto.engines.SM2Engine; import org.bouncycastle.util.encoders.Hex; static void testSM2Enc() { //sm2 加密模式:C1C3C2 //私钥 String privateKeyHex = "FAB8BBE670FAE338C9E9382B9FB6485225C11A3ECB84C938F10F20A93B6215F0"; //完整公钥“9EF573019D9A03B16B0BE44FC8A5B4E8E098F56034C97B312282DD0B4810AFC3CC759673ED0FC9B9DC7E6FA38F0E2B121E02654BF37EA6B63FAF2A0D6013EADF” //公钥X String x = "9EF573019D9A03B16B0BE44FC8A5B4E8E098F56034C97B312282DD0B4810AFC3"; //公钥Y String y = "CC759673ED0FC9B9DC7E6FA38F0E2B121E02654BF37EA6B63FAF2A0D6013EADF"; String content = "1234泰酷拉JJ"; System.out.println("待处理字符串：" + content); SM2 sm2 = new SM2(privateKeyHex, x, y); //默认是:C1C3C2 sm2.setMode(SM2Engine.Mode.C1C3C2); //公钥加密 byte[] byRst = sm2.encrypt(content.getBytes(), KeyType.PublicKey); String strRst = Hex.toHexString(byRst); System.out.println("加密后：" + strRst); byte[] byToDecrypt = Hex.decode(strRst); byte[] byDecrypted = sm2.decrypt(byToDecrypt, KeyType.PrivateKey); String strDecrypted = new String(byDecrypted); System.out.println("解密后：" + strDecrypted); }
end.