C#.NET 国密SM4对称加解密 与JAVA互通
摘自:
https://www.cnblogs.com/runliuv/p/17593661.html
.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：加密的KEY、明文等输入参数都需要string转 byte [] ，要约定好编码，如：UTF8。
2：加密后的输出参数：byte [] ，在传输时需要转为string，要约定好编码，如：16进制字符串。
这里演示的是“SM4/ECB/PKCS5Padding”，CBC的自行探索。
.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 =&nbsC#.NET 国密SM4对称加解密 与JAVA互通
摘自:https://www.cnblogs.com/runliuv/p/17593661.html .NET 环境：.NET6 控制台程序(.net core)。JAVA 环境：JAVA8，带maven 的JAV...
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本文2024-09-16 17:46:37发表“云星空知识”栏目。
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