RSA1024 bit private key encryption

RSA public key and private key pairs generated

 1 /// <summary>
 2         /// RSA生成公钥和私钥
 3         /// </summary>
 4         /// <returns></returns>
 5         public static string[] GenerateKeys()
 6         {
 7             try
 8             {
 9                 string[] sKeys = new String[2];
10                 RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024);
11                 sKeys[0] = rsa.ToXmlString(true);// private key 
12 is                  sKeys [ . 1 ] = rsa.ToXmlString ( to false ); // public key 
13 is                  return sKeys;
 14              }
 15              the catch (Exception)
 16              {
 . 17                  return  null ;
 18 is              }
 . 19          }

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RSA private key format conversion

 1 public class RSAKeyConvert
 2     {
 3         /// <summary>
 4         /// RSA私钥格式转换，java->.net
 5         /// </summary>
 6         /// <param name="privateKey">java生成的RSA私钥</param>
 7         /// <returns></returns>
 8         public static string RSAPrivateKeyJava2DotNet(string privateKey)
 9         {
10             RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));
11 
12             return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
13                 Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
14                 Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
15                 Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
16                 Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
17                 Convert.ToBase64String (privateKeyParam.DP.ToByteArrayUnsigned ()),
 18 is                  Convert.ToBase64String (privateKeyParam.DQ.ToByteArrayUnsigned ()),
 . 19                  Convert.ToBase64String (privateKeyParam.QInv.ToByteArrayUnsigned ()),
 20 is                  Convert.ToBase64String (privateKeyParam.Exponent. ToByteArrayUnsigned ()));
 21 is          }
 22 is  
23 is          ///  <Summary> 
24          /// the RSA private key format conversion, .NET -> Java
 25          ///  </ Summary> 
26 is          ///  <param name = "privateKey" > .NET generated private key </ param> 
27          ///  <Returns> </ Returns>
28         public static string RSAPrivateKeyDotNet2Java(string privateKey)
29         {
30             XmlDocument doc = new XmlDocument();
31             doc.LoadXml(privateKey);
32             BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
33             BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
34             BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText));
35             BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText));
36             BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText));
37             BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText));
38             BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText));
39             BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText));
40 
41             RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv);
42 
43             PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam);
44             byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded();
45             return Convert.ToBase64String(serializedPrivateBytes);
46         }
47 
48         /// <summary>
49         /// RSA公钥格式转换，java->.net
50         /// </summary>
51         /// <param name="publicKey">java生成的公钥</param>
52         /// <returns></returns>
53         public static string RSAPublicKeyJava2DotNet(string publicKey)
54         {
55             RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
56             return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
57                 Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
58                 Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
59         }
60 
61         /// <summary>
62         /// RSA公钥格式转换，.net->java
63         /// </summary>
64         /// <param name="publicKey">.net生成的公钥</param>
65         /// <returns></returns>
66         public static string RSAPublicKeyDotNet2Java(string publicKey)
67         {
68             XmlDocument doc = new XmlDocument();
69             doc.LoadXml(publicKey);
70             BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
71             BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
72             RsaKeyParameters pub = new RsaKeyParameters(false, m, p);
73 
74             SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);
75             byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
76             return Convert.ToBase64String(serializedPublicBytes);
77         }
78     }

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A private key to encrypt data

. 1  ///  <Summary> 
2          /// for RSA encryption with a private key to the data  
 . 3          ///  </ Summary>   
. 4          ///  <param name = "xmlPrivateKey"> private </ param>   
. 5          ///  < param name = "strEncryptString"> data to be encrypted </ param>   
. 6          ///  <Returns> data (the Base64) encrypted </ Returns>   
. 7          public  static  String RSAEncryptByPrivateKey ( String xmlPrivateKey, String strEncryptString)
 . 8          {
 . 9              // load private   
10             = PrivateRsa the RSACryptoServiceProvider new new the RSACryptoServiceProvider ( 1024 );
 . 11              privateRsa.FromXmlString (xmlPrivateKey);
 12 is  
13 is              // conversion key   
14              AsymmetricCipherKeyPair KeyPair = DotNetUtilities.GetKeyPair (privateRsa);
 15  
16              IBufferedCipher C = CipherUtilities.GetCipher ( " the RSA / an ECB / PKCS1Padding " ); // the same parameters in Java cryptographic parameters
 17              // first parameter to true to indicate encryption, decryption, false; second parameter key 
18 is              c.Init ( true , keyPair.Private);
 19  
20             byte[] DataToEncrypt = Encoding.UTF8.GetBytes(strEncryptString);
21             byte[] outBytes = c.DoFinal(DataToEncrypt);//加密  
22             string strBase64 = Convert.ToBase64String(outBytes);
23 
24             return strBase64;
25         }

View Code

Need to reference BouncyCastle.Crypto.dll

RSA1024 bit private key encryption

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