C#.NET 国密SM4加密解密 CBC ECB 2种模式

注意点：

1。加密时，明文转 byte[] 时，不要用 Encoding.Default，一定要指定编码，如：UTF-8。解密时，解出的 byte[] 转 string 同样要指定相同的编码。

2。algorithm，算法，双方要保持一致。

3。SM4有一个小问题：字符串的长度需要满足是16的倍数（>=1）,所以要padding.

nuget引用了三方库：Portable.BouncyCastle，1.9.0 版本。

基础工具类GmUtil.cs：

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); //c1Buffer.BlockCopy(c1c2c3, c1c2c3.Length - c3Len, result, c1Len, c3Len); //c3Buffer.BlockCopy(c1c2c3, c1Len, result, c1Len + c3Len, c1c2c3.Length - c1Len - c3Len); //c2return 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->65Buffer.BlockCopy(c1c3c2, c1Len + c3Len, result, c1Len, c1c3c2.Length - c1Len - c3Len); //c2Buffer.BlockCopy(c1c3c2, c1Len, result, c1c3c2.Length - c3Len, c3Len); //c3return 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<=32byte[] 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.NamefileStream = 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);}elsebyteSource.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) 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) 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");if (plain.Length % 16 != 0) 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) 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=1Asn1Sequence priSeq = (Asn1Sequence)asn1Sequence[1];//private keyAsn1Sequence 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: 9a7f77c578644050e09a9adc4245d1e6eba97554bc8ffd4fe15a78f37f891ff8AsymmetricKeyParameter 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 -> 681edf34d206965e86b3e94f536e4246byte[] 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)));}}
}

使用加解密：

using CommonUtils;
using Org.BouncyCastle.Utilities.Encoders;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace 国密SM4加密
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){}string _Key = "9814548961710661";//密钥长度必须为16字节。 string _Iv = "0000000000000000";/// <summary>/// SM4 ECB 加密/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnSm4EcbEncrypt_Click(object sender, EventArgs e){string algo = "SM4/ECB/NoPadding";byte[] keyBytes = Encoding.UTF8.GetBytes(_Key);//SM4有一个小问题：字符串的长度需要满足是16的倍数（>=1）,所以要padding.//加密前需要paddingbyte[] plain = MyPadding(Encoding.UTF8.GetBytes(txt明文.Text), 1);byte[] byRst = GmUtil.Sm4EncryptECB(keyBytes, plain, algo);string result2 = Encoding.UTF8.GetString(Hex.Encode(byRst));txt密文.Text = result2;}/// <summary>/// SM4 ECB 解密/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnSm4EcbDecrypt_Click(object sender, EventArgs e){string algo = "SM4/ECB/NoPadding";byte[] keyBytes = Encoding.UTF8.GetBytes(_Key);byte[] plain = Hex.Decode(txt密文.Text);byte[] byRst = GmUtil.Sm4DecryptECB(keyBytes, plain, algo);//解密后需要移除paddingbyte[] plain2 = MyPadding(byRst, 0);string result2 = Encoding.UTF8.GetString(plain2);txt解密后明文.Text = result2;}/// <summary>/// 补足 16 进制字符串的 0 字符，返回不带 0x 的16进制字符串/// </summary>/// <param name="input"></param>/// <param name="mode">1表示加密，0表示解密</param>/// <returns></returns>private static byte[] MyPadding(byte[] input, int mode){if (input == null){return null;}byte[] ret = (byte[])null;if (mode == 1){int p = 16 - input.Length % 16;ret = new byte[input.Length + p];Array.Copy(input, 0, ret, 0, input.Length);for (int i = 0; i < p; i++){ret[input.Length + i] = (byte)p;}}else{int p = input[input.Length - 1];ret = new byte[input.Length - p];Array.Copy(input, 0, ret, 0, input.Length - p);}return ret;}/// <summary>/// SM4 CBC 加密/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnSm4CbcEncrypt_Click(object sender, EventArgs e){//algorithmstring algo = "SM4/CBC/PKCS7Padding";             //algo = "SM4/CBC/NoPadding";byte[] keyBytes = Encoding.UTF8.GetBytes(_Key);byte[] ivBytes = Encoding.UTF8.GetBytes(_Iv);//加密前需要paddingbyte[] plain = MyPadding(Encoding.UTF8.GetBytes(txt明文.Text), 1);byte[] byRst = GmUtil.Sm4EncryptCBC(keyBytes, plain, ivBytes, algo);string result2 = Encoding.UTF8.GetString(Hex.Encode(byRst));txt密文.Text = result2;}/// <summary>/// SM4 CBC 解密/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnSm4CbcDecrypt_Click(object sender, EventArgs e){string algo = "SM4/CBC/PKCS7Padding";//algo = "SM4/CBC/NoPadding";byte[] keyBytes = Encoding.UTF8.GetBytes(_Key);byte[] ivBytes = Encoding.UTF8.GetBytes(_Iv);byte[] plain = Hex.Decode(txt密文.Text);byte[] byRst = GmUtil.Sm4DecryptCBC(keyBytes, plain, ivBytes, algo);//解密后需要移除paddingbyte[] plain2 = MyPadding(byRst, 0);string result2 = Encoding.UTF8.GetString(plain2);txt解密后明文.Text = result2;}}
}

MyPadding(byte[] input, int mode) 是补充和移除16位的方法。

SM4/ECB/NoPadding + MyPadding() 方法相当于 JAVA BC 库里的 SM4/ECB/PKCS5Padding。

使用 SM4/ECB/PKCS5Padding 时就不需要MyPadding() 方法了。并且去除 “//if (cipher.Length % 16 != 0) throw new ArgumentException("err data length");” 这个限制。

C#.NET 国密SM4加密解密 CBC ECB 2种模式相关推荐

国密SM4加解密SM2签名验签COM组件DLL
提供给第三方软件,调用COM组件DLL方式进行实现,如delphi.PB等. 基于C#编写的COM组件DLL,可实现SM2签名验签,SM4加解密,100%适用于黑龙江省国家医保接口中进行应用. 功能包 ...
基于Java的（SM2_SM3_SM4）国密算法, 加密解密工具类及测试demo
编写本文的同时借鉴了多位同学写的demo, 最后发现这位同学写的最详细, 放上该作者的链接, 原版链接: https://download.csdn.net/download/ererfei/9474 ...
使用Bouncy Castle（pom版本：bcprov-jdk15on 1.59）中SM4 加密解密算法 ECB
SM4 加密算法加密 SM4算法是一种分组密码算法.其分组长度为128bit,密钥长度也为128bit. 加密算法与密钥扩展算法均采用32轮非线性迭代结构,以字(32位)为单位进行加密运算,每一次迭 ...
C#国密SM4 CBC加密解密
** C#国密SM4 CBC加密解密在你得项目nuget引用程序集:KYSharp.SM 安装 2.0 版本,里面才有sm4的加密 ** static void Main(string[] args ...
国密SM4，layui前端和.net core后台加密解密 .net加密解密
提示:文章写完后,目录可以自动生成,如何生成可参考右边的帮助文档文章目录前言一.本文做用?? 二.SM4介绍三.使用步骤 1.前台实现加密 2.后台实现解密四总结前言第一次分享,我是个 ...
vue中如何使用SM4国密来加密？
最近做一个项目,登录接口的账号密码两个参数后端规定的是用国密SM4来加密,以前从来没用过这个方法,也百度了一下,但文章了了无几,而且基本内容都是一样的,因为这种加密方式大部分都是java用来加密的,百 ...
[crypto]-52-python3中rsa(签名验签加密解密)aes(ecb cbc ctr)hmac的使用,以及unittest测试用
环境: 在ubuntu14.04下,记得安装:sudo pip3 install pycrypto 代码示例1: =========================== import base64 f ...
一文搞懂国密SM加密（VIP典藏版）
目录一.前言加密概述对称算法(分组密码算法):AES/DES/3DES/SM4/SM4 非对称算法(公钥密码算法):RSA/DSA/ECC/SM2 摘要算法(杂凑算法):MD5/SHA-I/SM ...
一个关于国密SM4的故事
一个关于国密SM4的故事我的名字叫SM4,我还有三位兄长,分别是大哥SM1, 二哥SM2, 和三哥SM3.说起我的名字,故事要回到2006年的时候,我出生的时候并不是叫SM4的,而是叫做SMS4.只 ...

C#.NET 国密SM4加密解密 CBC ECB 2种模式

C#.NET 国密SM4加密解密 CBC ECB 2种模式相关推荐

最新文章

热门文章