JAVA RSA私钥加密(签名) 对应 C# RSA私钥加密(签名)-白红宇

JAVA RSA私钥加密(签名) 对应 C# RSA私钥加密(签名)

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发布时间：2019-06-19

本文共 9101 字，大约阅读时间需要 30 分钟。

非对称密钥RSA算法加解密在C#和Java之间交互的问题，这两天看了很多其他人写的文章，碰到了几个问题，最终解决问题。

参考地址：http://xw-z1985.iteye.com/blog/1837376

需求目的：完成c#请求端RSA加密(签名)问题，客户端采用C#开发，服务器端采用Java开发。服务器端给客户端提供私钥，进行数据加密(签名)，客户端加密(签名)后提数据提交给服务器，服务器用公钥对数据解密，进行验证。

解决过程碰到的问题：

1.JAVA 需要的 RSA私钥格式和 C# 需要的 RSA私钥不一致。

JAVA 需要是 PKCS8格式私钥:

C# 需要的是 PKCS1 格式私钥:

2.私钥格式之间的转换问题

转换工具：openssl工具:

转换参考地址： http://blog.csdn.net/hanzengyi/article/details/78029104

java 代码，注意这里的私钥：是Pem私钥文件中去除头（-----BEGIN PRIVATE KEY-----）和尾（-----END PRIVATE KEY-----）以及换行符后的字符串

1 　　　/** 2      * @data: 待加密的字符串 3      * @privateKey: 私钥 4      */ 5     public static String sign(byte[] data, String privateKey) throws Exception { 6  7         byte[] keyBytes = new BASE64Decoder().decodeBuffer(privateKey); 8         PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); 9 10         KeyFactory keyFactory = KeyFactory.getInstance("RSA");11 12         PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);13 14         Signature signature = Signature.getInstance("SHA1withRSA");15         signature.initSign(priKey);16         signature.update(data);17 18         return  byte2hex(signature.sign());19     }

c# 代码，注意这里的私钥：是Pem私钥文件中去除头（-----BEGIN RSA PRIVATE KEY-----）和尾（-----END RSA PRIVATE KEY-----）以及换行符后的字符串

1 　　　　  ///   2 　　　　  /// 签名  3 　　　　  /// 
  4 　　　　  /// 待加密的字符串  5 　　　　  /// 私钥  6  　　　　 /// 
       7 　　　　　public static string Sign(string data, string privateKey)  8         {  9             RSACryptoServiceProvider rsaCsp = LoadCertificate(privateKey); 10             byte[] dataBytes = Encoding.UTF8.GetBytes(data); 11             byte[] signatureBytes = rsaCsp.SignData(dataBytes, "SHA1"); 12             return Hex_2To16(signatureBytes); 13         } 14  15         private static RSACryptoServiceProvider LoadCertificate(string privateKey) 16         { 17             byte[] res = res = Convert.FromBase64String(privateKey); 18             try 19             { 20                 RSACryptoServiceProvider rsa = DecodeRSAPrivateKey(res); 21                 return rsa; 22             } 23             catch (Exception ex) 24             { 25             } 26             return null; 27         } 28  29         private static RSACryptoServiceProvider DecodeRSAPrivateKey(byte[] privkey) 30         { 31             byte[] MODULUS, E, D, P, Q, DP, DQ, IQ; 32  33             // --------- Set up stream to decode the asn.1 encoded RSA private key ------ 34             MemoryStream mem = new MemoryStream(privkey); 35             BinaryReader binr = new BinaryReader(mem);  //wrap Memory Stream with BinaryReader for easy reading 36             byte bt = 0; 37             ushort twobytes = 0; 38             int elems = 0; 39             try 40             { 41                 twobytes = binr.ReadUInt16(); 42                 if (twobytes == 0x8130) //data read as little endian order (actual data order for Sequence is 30 81) 43                     binr.ReadByte();    //advance 1 byte 44                 else if (twobytes == 0x8230) 45                     binr.ReadInt16();    //advance 2 bytes 46                 else 47                     return null; 48  49                 twobytes = binr.ReadUInt16(); 50                 if (twobytes != 0x0102) //version number 51                     return null; 52                 bt = binr.ReadByte(); 53                 if (bt != 0x00) 54                     return null; 55  56  57                 //------ all private key components are Integer sequences ---- 58                 elems = GetIntegerSize(binr); 59                 MODULUS = binr.ReadBytes(elems); 60  61                 elems = GetIntegerSize(binr); 62                 E = binr.ReadBytes(elems); 63  64                 elems = GetIntegerSize(binr); 65                 D = binr.ReadBytes(elems); 66  67                 elems = GetIntegerSize(binr); 68                 P = binr.ReadBytes(elems); 69  70                 elems = GetIntegerSize(binr); 71                 Q = binr.ReadBytes(elems); 72  73                 elems = GetIntegerSize(binr); 74                 DP = binr.ReadBytes(elems); 75  76                 elems = GetIntegerSize(binr); 77                 DQ = binr.ReadBytes(elems); 78  79                 elems = GetIntegerSize(binr); 80                 IQ = binr.ReadBytes(elems); 81  82  83                 // ------- create RSACryptoServiceProvider instance and initialize with public key ----- 84                 CspParameters CspParameters = new CspParameters(); 85                 CspParameters.Flags = CspProviderFlags.UseMachineKeyStore; 86                 RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(1024, CspParameters); 87                 RSAParameters RSAparams = new RSAParameters(); 88                 RSAparams.Modulus = MODULUS; 89                 RSAparams.Exponent = E; 90                 RSAparams.D = D; 91                 RSAparams.P = P; 92                 RSAparams.Q = Q; 93                 RSAparams.DP = DP; 94                 RSAparams.DQ = DQ; 95                 RSAparams.InverseQ = IQ; 96                 RSA.ImportParameters(RSAparams); 97                 return RSA; 98             } 99             catch (Exception ex)100             {101                 return null;102             }103             finally104             {105                 binr.Close();106             }107         }108 109         private static int GetIntegerSize(BinaryReader binr)110         {111             byte bt = 0;112             byte lowbyte = 0x00;113             byte highbyte = 0x00;114             int count = 0;115             bt = binr.ReadByte();116             if (bt != 0x02)        //expect integer117                 return 0;118             bt = binr.ReadByte();119 120             if (bt == 0x81)121                 count = binr.ReadByte();    // data size in next byte122             else123                 if (bt == 0x82)124             {125                 highbyte = binr.ReadByte();    // data size in next 2 bytes126                 lowbyte = binr.ReadByte();127                 byte[] modint = { lowbyte, highbyte, 0x00, 0x00 };128                 count = BitConverter.ToInt32(modint, 0);129             }130             else131             {132                 count = bt;        // we already have the data size133             }134 135             while (binr.ReadByte() == 0x00)136             {    //remove high order zeros in data137                 count -= 1;138             }139             binr.BaseStream.Seek(-1, SeekOrigin.Current);        //last ReadByte wasn't a removed zero, so back up a byte140             return count;141         }142 143 144         /// 145         /// 2进制转16进制146         /// 
147         public static String Hex_2To16(Byte[] bytes)148         {149             String hexString = String.Empty;150             Int32 iLength = 65535;151             if (bytes != null)152             {153                 StringBuilder strB = new StringBuilder();154 155                 if (bytes.Length < iLength)156                 {157                     iLength = bytes.Length;158                 }159 160                 for (int i = 0; i < iLength; i++)161                 {162                     strB.Append(bytes[i].ToString("X2"));163                 }164                 hexString = strB.ToString();165             }166             return hexString;167         }

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