java与.net平台之间进行RSA加密验证


		 
RSA加密算法虽然不分平台，标准都是一样的，但是各个平台的实现方式都不尽相同，下面来我来说说
java与.net平台之间该如何进行RSA加密验证，
即java端加密-》.net端验证和.net端加密-》java端验证。
我对RSA算法也只是停留在应用的层面，所以我就以应用的角度来说说这个过程。
首先，我们来看一下java端的私钥和公钥的样子：
私钥：
MIICeQIBADANBgkqhkiG9w0BAQEFAASCAmMwggJfAgEAAoGBAL6VJN4ZkfZA3aPPgKC3xaqT/yZT5FOlQ5TGg6heVqDVEHHVLH1E+HEEmWmuTv2ngz9pZbzy9KWkJpV59W1dgNHSSk575VjUAv0BhZXFSH0lng2mZ2Q5/2dVxKsASjJ2bQiEGUD8LO5KpaLlfQpo3ANovBZvUtHw5exegnyXyZbDAgMBAAECgYEAr7YEWr1KhLcDYg9jMUqd9QokOSspnTEGoPlx016/EeO/GKSJMynOwSyTYQszisvRxzoecdmyU7GHXVMnQ2Ds7WvbcuNkIRWmxFa4nTkk2zNF6KByvvFwLiW4LQXF6B+uV7+ZNqvfhCoD/j2wki8jfWkuuAaKnTda/axHMi+zRYECQQD73iC2GjZyur4amJQPK6d+kDlJ0dYyyUvQa0vd6mfoPnQDOIqayBaueSwWIpLI/L7eUuP9CDFryQtdBvWqD/dBAkEAwbWcrybn0eaxiPZacZLZXzXO8g12hYoXT1h0DTLvy1rnVUOspNfKZcBZMjPxT4+QEknoTShSnSbJ5sHitfZxAwJBANMlU2z2KqEh1k77jFvvb9oVVEGDbTtkL2+JE6/1W6iB+sXcd63sgb9Ai+n+j+l4oRZGjSTJ4oyGnUUemYI5IkECQQCA9JNrcv4PGYIFCOPrCfTV0m+Dan0Fp4mfE+amRsumWEz60UOktdeS53s51aSG767czgDtJLPi1MjCaz6vHnHbAkEA4NxLLg6UCAoCpXMgqqZHWMgbMwNNFr9diCWP/tZ5OJmWYHgn7zfqMXa/RNaethjdG1biIkj5h7qm6XDBBqGuxw==

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>
所以，只要将一边的公钥和私钥转换成另一边的即可。
我的做法是将java端的公钥和私钥转换成.net端的公钥和私钥。
咱们先看私钥的转换：
// --- Returns XML encoded RSA private key string suitable for .NET
    // CryptoServiceProvider.FromXmlString(true) ------
    // --- Leading zero bytes (most significant) must be removed for XML
    // encoding for .NET; otherwise format error ---
    private String getRSAPrivateKeyAsNetFormat(byte[] encodedPrivkey) {
        try {
            StringBuffer buff = new StringBuffer(1024);
            PKCS8EncodedKeySpec pvkKeySpec = new PKCS8EncodedKeySpec(
                    encodedPrivkey);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            RSAPrivateCrtKey pvkKey = (RSAPrivateCrtKey) keyFactory
                    .generatePrivate(pvkKeySpec);
            buff.append("<RSAKeyValue>");
            buff.append("<Modulus>"
                    + b64encode(removeMSZero(pvkKey.getModulus().toByteArray()))
                    + "</Modulus>");
            buff.append("<Exponent>"
                    + b64encode(removeMSZero(pvkKey.getPublicExponent()
                            .toByteArray())) + "</Exponent>");
            buff.append("<P>"
                    + b64encode(removeMSZero(pvkKey.getPrimeP().toByteArray()))
                    + "</P>");
            buff.append("<Q>"
                    + b64encode(removeMSZero(pvkKey.getPrimeQ().toByteArray()))
                    + "</Q>");
            buff.append("<DP>"
                    + b64encode(removeMSZero(pvkKey.getPrimeExponentP()
                            .toByteArray())) + "</DP>");
            buff.append("<DQ>"
                    + b64encode(removeMSZero(pvkKey.getPrimeExponentQ()
                            .toByteArray())) + "</DQ>");
            buff.append("<InverseQ>"
                    + b64encode(removeMSZero(pvkKey.getCrtCoefficient()
                            .toByteArray())) + "</InverseQ>");
            buff.append("<D>"
                    + b64encode(removeMSZero(pvkKey.getPrivateExponent()
                            .toByteArray())) + "</D>");

补充：综合编程 , 安全编程 ,