JAVA，NET RSA密钥格式转换

JAVA和NET RSA密钥格式相互转换（公钥，私钥）

做了一个小项目遇到java和.net非对称加密问题，java的公钥和私钥就直接是一个字符串的形式展示的，但是.net是以xml简单包裹形式展示的，这样就会出现秘钥不一致的情况，导致java和.net加密与解密出现障碍，

首先，我们来看一下java端的私钥和公钥的样子：

私钥：

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

公钥：

MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC+lSTeGZH2QN2jz4Cgt8Wqk/8mU+RTpUOUxoOoXlag1RBx1Sx9RPhxBJlprk79p4M/aWW88vSlpCaVefVtXYDR0kpOe+VY1AL9AYWVxUh9JZ4NpmdkOf9nVcSrAEoydm0IhBlA/CzuSqWi5X0KaNwDaLwWb1LR8OXsXoJ8l8mWwwIDAQAB

我们再来看一下.net端的私钥和公钥的样子：
私钥：

<RSAKeyValue><Modulus>vpUk3hmR9kDdo8+AoLfFqpP/JlPkU6VDlMaDqF5WoNUQcdUsfUT4cQSZaa5O/aeDP2llvPL0paQmlXn1bV2A0dJKTnvlWNQC/QGFlcVIfSWeDaZnZDn/Z1XEqwBKMnZtCIQZQPws7kqlouV9CmjcA2i8Fm9S0fDl7F6CfJfJlsM=</Modulus><Exponent>AQAB</Exponent><P>+94gtho2crq+GpiUDyunfpA5SdHWMslL0GtL3epn6D50AziKmsgWrnksFiKSyPy+3lLj/Qgxa8kLXQb1qg/3QQ==</P><Q>wbWcrybn0eaxiPZacZLZXzXO8g12hYoXT1h0DTLvy1rnVUOspNfKZcBZMjPxT4+QEknoTShSnSbJ5sHitfZxAw==</Q><DP>0yVTbPYqoSHWTvuMW+9v2hVUQYNtO2Qvb4kTr/VbqIH6xdx3reyBv0CL6f6P6XihFkaNJMnijIadRR6ZgjkiQQ==</DP><DQ>gPSTa3L+DxmCBQjj6wn01dJvg2p9BaeJnxPmpkbLplhM+tFDpLXXkud7OdWkhu+u3M4A7SSz4tTIwms+rx5x2w==</DQ><InverseQ>4NxLLg6UCAoCpXMgqqZHWMgbMwNNFr9diCWP/tZ5OJmWYHgn7zfqMXa/RNaethjdG1biIkj5h7qm6XDBBqGuxw==</InverseQ><D>r7YEWr1KhLcDYg9jMUqd9QokOSspnTEGoPlx016/EeO/GKSJMynOwSyTYQszisvRxzoecdmyU7GHXVMnQ2Ds7WvbcuNkIRWmxFa4nTkk2zNF6KByvvFwLiW4LQXF6B+uV7+ZNqvfhCoD/j2wki8jfWkuuAaKnTda/axHMi+zRYE=</D></RSAKeyValue>

公钥：

<RSAKeyValue><Modulus>vpUk3hmR9kDdo8+AoLfFqpP/JlPkU6VDlMaDqF5WoNUQcdUsfUT4cQSZaa5O/aeDP2llvPL0paQmlXn1bV2A0dJKTnvlWNQC/QGFlcVIfSWeDaZnZDn/Z1XEqwBKMnZtCIQZQPws7kqlouV9CmjcA2i8Fm9S0fDl7F6CfJfJlsM=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>

一下给出java和.net互相转化代码

---

不多说直接上代码，需要引用开源类库BouncyCastle.Crypto.dll

也可以在这里下载http://downloads.bouncycastle.org/csharp/bccrypto-net-1.7-bin.zip

以下为转化代码

 using System;
 using System.Xml;
 using Org.BouncyCastle.Asn1.Pkcs;
 using Org.BouncyCastle.Asn1.X509;
 using Org.BouncyCastle.Crypto.Parameters;
 using Org.BouncyCastle.Math;
 using Org.BouncyCastle.Pkcs;
 using Org.BouncyCastle.Security;
 using Org.BouncyCastle.X509;
 /// <summary>
 /// RSA密钥格式转换
 /// </summary>
 public class RSAKeyConvert
 {
     /// <summary>
     /// RSA私钥格式转换，java->.net
     /// </summary>
     /// <param name="privateKey">java生成的RSA私钥</param>
     /// <returns></returns>
     public static string RSAPrivateKeyJava2DotNet(string privateKey)
     {
         RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));
         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>",
         Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
         Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
         Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
         Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
         Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),
         Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),
         Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),
          Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));
     }
     /// <summary>
     /// RSA私钥格式转换，.net->java
     /// </summary>
     /// <param name="privateKey">.net生成的私钥</param>
     /// <returns></returns>
     public static string RSAPrivateKeyDotNet2Java(string privateKey)
     {
         XmlDocument doc = new XmlDocument();
         doc.LoadXml(privateKey);
         BigInteger m = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[].InnerText));
         BigInteger exp = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[].InnerText));
         BigInteger d = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[].InnerText));
         BigInteger p = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[].InnerText));
         BigInteger q = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[].InnerText));
         BigInteger dp = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[].InnerText));
         BigInteger dq = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[].InnerText));
         BigInteger qinv = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[].InnerText));
         RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv);
         PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam);
         byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded();
         return Convert.ToBase64String(serializedPrivateBytes);
     }
     /// <summary>
     /// RSA公钥格式转换，java->.net
     /// </summary>
     /// <param name="publicKey">java生成的公钥</param>
     /// <returns></returns>
     public static string RSAPublicKeyJava2DotNet(string publicKey)
     {
         RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
         return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
             Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
             Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
     }
     /// <summary>
     /// RSA公钥格式转换，.net->java
     /// </summary>
     /// <param name="publicKey">.net生成的公钥</param>
     /// <returns></returns>
     public static string RSAPublicKeyDotNet2Java(string publicKey)
     {
         XmlDocument doc = new XmlDocument(); doc.LoadXml(publicKey);
         BigInteger m = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[].InnerText));
         BigInteger p = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[].InnerText));
         RsaKeyParameters pub = new RsaKeyParameters(false, m, p);
         SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);
         byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
         return Convert.ToBase64String(serializedPublicBytes);
     }
 }