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SMCryptoUtils/EasyGmUtils.cs
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460
SMCryptoUtils/EasyGmUtils.cs
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using System;
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using Org.BouncyCastle.Utilities.Encoders;
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using Org.BouncyCastle.Asn1;
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using Org.BouncyCastle.Asn1.GM;
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using Org.BouncyCastle.Asn1.X9;
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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Digests;
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using Org.BouncyCastle.Crypto.Engines;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Math;
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using Org.BouncyCastle.Security;
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using Org.BouncyCastle.Utilities;
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using System.IO;
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using System.Runtime.InteropServices;
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namespace SMCryptoUtils
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{
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[ClassInterface(ClassInterfaceType.None)]
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public class EasyGmUtils:IEasyGmUtils
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{
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private static X9ECParameters x9ECParameters = GMNamedCurves.GetByName("sm2p256v1");
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private static ECDomainParameters ecDomainParameters = new ECDomainParameters(x9ECParameters.Curve, x9ECParameters.G, x9ECParameters.N);
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/**
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*
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* @param msg
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* @param userId
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* @param privateKey
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* @return r||s，直接拼接byte数组的rs
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*/
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public byte[] signSm3WithSm2(byte[] msg, byte[] userId, byte[] privateKeyBytes)
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{
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ECPrivateKeyParameters privateKeyParameters = getPrivatekeyFromD(new BigInteger(1, privateKeyBytes));
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return rsAsn1ToPlainByteArray(signSm3WithSm2Asn1Rs(msg, userId, privateKeyParameters));
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}
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/**
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* @param msg
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* @param userId
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* @param privateKey
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* @return rs in <b>asn1 format</b>
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*/
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public byte[] signSm3WithSm2Asn1Rs(byte[] msg, byte[] userId, AsymmetricKeyParameter privateKey)
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{
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try
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{
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ISigner signer = SignerUtilities.InitSigner("SM3withSM2", true, privateKey, new SecureRandom());
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signer.BlockUpdate(msg, 0, msg.Length);
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byte[] sig = signer.GenerateSignature();
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return sig;
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}
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catch (Exception e)
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{
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//log.Error("SignSm3WithSm2Asn1Rs error: " + e.Message, e);
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return null;
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}
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}
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/**
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*
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* @param msg
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* @param userId
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* @param rs r||s，直接拼接byte数组的rs
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* @param publicKey
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* @return
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*/
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public bool verifySm3WithSm2(byte[] msg, byte[] userId, byte[] rs, byte[] publicKeyBytes)
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{
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if (rs == null || msg == null || userId == null) return false;
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if (rs.Length != RS_LEN * 2) return false;
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if (publicKeyBytes.Length != 64 && publicKeyBytes.Length != 65) throw new ArgumentException("err key length");
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BigInteger x, y;
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if (publicKeyBytes.Length > 64)
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{
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x = fromUnsignedByteArray(publicKeyBytes, 1, 32);
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y = fromUnsignedByteArray(publicKeyBytes, 33, 32);
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}
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else
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{
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x = fromUnsignedByteArray(publicKeyBytes, 0, 32);
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y = fromUnsignedByteArray(publicKeyBytes, 32, 32);
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}
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ECPublicKeyParameters publicKey = getPublickeyFromXY(x, y);
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return verifySm3WithSm2Asn1Rs(msg, userId, rsPlainByteArrayToAsn1(rs), publicKey);
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}
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public BigInteger fromUnsignedByteArray(byte[] var0, int var1, int var2)
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{
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byte[] var3 = var0;
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if (var1 != 0 || var2 != var0.Length)
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{
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var3 = new byte[var2];
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Array.Copy(var0, var1, var3, 0, var2);
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}
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return new BigInteger(1, var3);
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}
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/**
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*
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* @param msg
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* @param userId
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* @param rs in <b>asn1 format</b>
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* @param publicKey
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* @return
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*/
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public bool verifySm3WithSm2Asn1Rs(byte[] msg, byte[] userId, byte[] sign, AsymmetricKeyParameter publicKey)
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{
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try
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{
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ISigner signer = SignerUtilities.GetSigner("SM3withSM2");
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signer.Init(false, publicKey);
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signer.BlockUpdate(msg, 0, msg.Length);
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return signer.VerifySignature(sign);
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}
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catch (Exception e)
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{
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//log.Error("VerifySm3WithSm2Asn1Rs error: " + e.Message, e);
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return false;
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}
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}
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/**
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* 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
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* @param c1c2c3
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* @return
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*/
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private static byte[] changeC1C2C3ToC1C3C2(byte[] c1c2c3)
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{
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int c1Len = (x9ECParameters.Curve.FieldSize + 7) / 8 * 2 + 1; //sm2p256v1的这个固定65。可看GMNamedCurves、ECCurve代码。
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const int c3Len = 32; //new SM3Digest().getDigestSize();
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byte[] result = new byte[c1c2c3.Length];
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Buffer.BlockCopy(c1c2c3, 0, result, 0, c1Len); //c1
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Buffer.BlockCopy(c1c2c3, c1c2c3.Length - c3Len, result, c1Len, c3Len); //c3
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Buffer.BlockCopy(c1c2c3, c1Len, result, c1Len + c3Len, c1c2c3.Length - c1Len - c3Len); //c2
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return result;
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}
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/**
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* 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
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* @param c1c3c2
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* @return
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*/
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private static byte[] changeC1C3C2ToC1C2C3(byte[] c1c3c2)
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{
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int c1Len = (x9ECParameters.Curve.FieldSize + 7) / 8 * 2 + 1; //sm2p256v1的这个固定65。可看GMNamedCurves、ECCurve代码。
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const int c3Len = 32; //new SM3Digest().GetDigestSize();
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byte[] result = new byte[c1c3c2.Length];
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Buffer.BlockCopy(c1c3c2, 0, result, 0, c1Len); //c1: 0->65
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Buffer.BlockCopy(c1c3c2, c1Len + c3Len, result, c1Len, c1c3c2.Length - c1Len - c3Len); //c2
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Buffer.BlockCopy(c1c3c2, c1Len, result, c1c3c2.Length - c3Len, c3Len); //c3
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return result;
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}
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/**
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* c1||c3||c2
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* @param data
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* @param key
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* @return
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*/
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public byte[] sm2Decrypt(byte[] data, AsymmetricKeyParameter key)
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{
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return sm2DecryptOld(changeC1C3C2ToC1C2C3(data), key);
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}
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/**
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* c1||c3||c2
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* @param data
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* @param key
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* @return
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*/
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public byte[] sm2Encrypt(byte[] data, AsymmetricKeyParameter key)
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{
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return changeC1C2C3ToC1C3C2(sm2EncryptOld(data, key));
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}
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/**
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* c1||c2||c3
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* @param data
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* @param key
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* @return
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*/
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public byte[] sm2EncryptOld(byte[] data, AsymmetricKeyParameter pubkey)
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{
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try
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{
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SM2Engine sm2Engine = new SM2Engine();
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sm2Engine.Init(true, new ParametersWithRandom(pubkey, new SecureRandom()));
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return sm2Engine.ProcessBlock(data, 0, data.Length);
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}
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catch (Exception e)
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{
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//log.Error("Sm2EncryptOld error: " + e.Message, e);
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return null;
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}
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}
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/**
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* c1||c2||c3
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* @param data
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* @param key
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* @return
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*/
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public byte[] sm2DecryptOld(byte[] data, AsymmetricKeyParameter key)
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{
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try
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{
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SM2Engine sm2Engine = new SM2Engine();
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sm2Engine.Init(false, key);
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return sm2Engine.ProcessBlock(data, 0, data.Length);
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}
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catch (Exception e)
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{
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//log.Error("Sm2DecryptOld error: " + e.Message, e);
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return null;
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}
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}
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/**
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* @param bytes
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* @return
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*/
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public byte[] sm3(byte[] bytes)
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{
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try
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{
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SM3Digest digest = new SM3Digest();
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digest.BlockUpdate(bytes, 0, bytes.Length);
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byte[] result = DigestUtilities.DoFinal(digest);
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return result;
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}
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catch (Exception e)
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{
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//log.Error("Sm3 error: " + e.Message, e);
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return null;
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}
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}
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private const int RS_LEN = 32;
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private static byte[] bigIntToFixexLengthBytes(BigInteger rOrS)
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{
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// for sm2p256v1, n is 00fffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123,
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// r and s are the result of mod n, so they should be less than n and have length<=32
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byte[] rs = rOrS.ToByteArray();
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if (rs.Length == RS_LEN) return rs;
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else if (rs.Length == RS_LEN + 1 && rs[0] == 0) return Arrays.CopyOfRange(rs, 1, RS_LEN + 1);
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else if (rs.Length < RS_LEN)
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{
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byte[] result = new byte[RS_LEN];
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Arrays.Fill(result, (byte)0);
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Buffer.BlockCopy(rs, 0, result, RS_LEN - rs.Length, rs.Length);
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return result;
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}
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else
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{
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throw new ArgumentException("err rs: " + Hex.ToHexString(rs));
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}
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}
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/**
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* 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
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* @param rsDer rs in asn1 format
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* @return sign result in plain byte array
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*/
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private static byte[] rsAsn1ToPlainByteArray(byte[] rsDer)
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{
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Asn1Sequence seq = Asn1Sequence.GetInstance(rsDer);
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byte[] r = bigIntToFixexLengthBytes(DerInteger.GetInstance(seq[0]).Value);
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byte[] s = bigIntToFixexLengthBytes(DerInteger.GetInstance(seq[1]).Value);
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byte[] result = new byte[RS_LEN * 2];
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Buffer.BlockCopy(r, 0, result, 0, r.Length);
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Buffer.BlockCopy(s, 0, result, RS_LEN, s.Length);
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return result;
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}
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/**
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* 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
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* @param sign in plain byte array
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* @return rs result in asn1 format
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*/
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private static byte[] rsPlainByteArrayToAsn1(byte[] sign)
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{
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if (sign.Length != RS_LEN * 2) throw new ArgumentException("err rs. ");
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BigInteger r = new BigInteger(1, Arrays.CopyOfRange(sign, 0, RS_LEN));
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BigInteger s = new BigInteger(1, Arrays.CopyOfRange(sign, RS_LEN, RS_LEN * 2));
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Asn1EncodableVector v = new Asn1EncodableVector();
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v.Add(new DerInteger(r));
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v.Add(new DerInteger(s));
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try
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{
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return new DerSequence(v).GetEncoded("DER");
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}
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catch (IOException e)
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{
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//log.Error("RsPlainByteArrayToAsn1 error: " + e.Message, e);
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return null;
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}
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}
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public byte[] sm4DecryptCBC(byte[] keyBytes, byte[] cipher, byte[] iv, String algo)
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{
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if (keyBytes.Length != 16) throw new ArgumentException("err key length");
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if (cipher.Length % 16 != 0) throw new ArgumentException("err data length");
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try
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{
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KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes);
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IBufferedCipher c = CipherUtilities.GetCipher(algo);
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if (iv == null) iv = zeroIv(algo);
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c.Init(false, new ParametersWithIV(key, iv));
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return c.DoFinal(cipher);
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}
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catch (Exception e)
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{
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//log.Error("Sm4DecryptCBC error: " + e.Message, e);
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return null;
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}
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}
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public byte[] sm4EncryptCBC(byte[] keyBytes, byte[] plain, byte[] iv, String algo)
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{
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if (keyBytes.Length != 16) throw new ArgumentException("err key length");
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if (plain.Length % 16 != 0) throw new ArgumentException("err data length");
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try
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{
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KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes);
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IBufferedCipher c = CipherUtilities.GetCipher(algo);
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if (iv == null) iv = zeroIv(algo);
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c.Init(true, new ParametersWithIV(key, iv));
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return c.DoFinal(plain);
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}
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catch (Exception e)
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{
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//log.Error("Sm4EncryptCBC error: " + e.Message, e);
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return null;
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}
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}
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public byte[] sm4EncryptECB(byte[] keyBytes, byte[] plain, string algo)
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{
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if (keyBytes.Length != 16) throw new ArgumentException("err key length");
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if (plain.Length % 16 != 0) throw new ArgumentException("err data length");
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try
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{
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KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes);
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IBufferedCipher c = CipherUtilities.GetCipher(algo);
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c.Init(true, key);
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return c.DoFinal(plain);
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}
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catch (Exception e)
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{
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//log.Error("Sm4EncryptECB error: " + e.Message, e);
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return null;
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}
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}
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public byte[] sm4DecryptECB(byte[] keyBytes, byte[] cipher, string algo)
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{
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if (keyBytes.Length != 16) throw new ArgumentException("err key length");
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if (cipher.Length % 16 != 0) throw new ArgumentException("err data length");
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try
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{
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KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes);
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IBufferedCipher c = CipherUtilities.GetCipher(algo);
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c.Init(false, key);
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return c.DoFinal(cipher);
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}
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catch (Exception e)
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{
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//log.Error("Sm4DecryptECB error: " + e.Message, e);
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return null;
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}
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}
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public ECPrivateKeyParameters getPrivatekeyFromD(BigInteger d)
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{
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return new ECPrivateKeyParameters(d, ecDomainParameters);
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}
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public ECPublicKeyParameters getPublickeyFromXY(BigInteger x, BigInteger y)
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{
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return new ECPublicKeyParameters(x9ECParameters.Curve.CreatePoint(x, y), ecDomainParameters);
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}
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public byte[] sm4Encrypt(byte[] keyBytes, byte[] plain)
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{
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if (keyBytes.Length != 16) throw new ArgumentException("err key length");
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// if (plain.length % 16 != 0) throw new RuntimeException("err data length");
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try
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{
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KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes);
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IBufferedCipher c = CipherUtilities.GetCipher("SM4/ECB/PKCS7Padding");
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c.Init(true, key);
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return c.DoFinal(plain);
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}
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catch (Exception e)
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{
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return null;
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}
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}
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public byte[] sm4Decrypt(byte[] keyBytes, byte[] cipher)
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{
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// if (keyBytes.length != 16) throw new RuntimeException("err key length");
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if (cipher.Length % 16 != 0) throw new ArgumentException("err data length");
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try
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{
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KeyParameter key = ParameterUtilities.CreateKeyParameter("SM4", keyBytes);
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IBufferedCipher c = CipherUtilities.GetCipher("SM4/ECB/PKCS7Padding");
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c.Init(false, key);
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return c.DoFinal(cipher);
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}
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catch (Exception e)
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{
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return null;
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}
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}
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public const String SM4_ECB_NOPADDING = "SM4/ECB/NoPadding";
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public const String SM4_CBC_NOPADDING = "SM4/CBC/NoPadding";
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public const String SM4_CBC_PKCS7PADDING = "SM4/CBC/PKCS7Padding";
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public byte[] zeroIv(String algo)
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{
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try
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{
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IBufferedCipher cipher = CipherUtilities.GetCipher(algo);
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int blockSize = cipher.GetBlockSize();
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byte[] iv = new byte[blockSize];
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Arrays.Fill(iv, (byte)0);
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return iv;
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}
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catch (Exception e)
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{
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//log.Error("ZeroIv error: " + e.Message, e);
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return null;
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}
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}
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}
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}
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