使用RSA的Android加密方法中的无效密码字节

Question

当我们试图在Android中加密数据并在WCF服务中解密数据时，我们面临着一个问题。用于加密数据的Android代码如下：

try{
String strModulus = "tr82UfeGetV7yBKcOPjFTWs7pHqqr/5YKKWMUZ/HG4HnCmWrZsOhuR1FBnMZ/g2YiosoSlu0zd7Ukz9lX7wv2RLfWXfMvZYGpAAvfYWwzbyQ2i1q+tKE/thgKNscoSRellDD+uJcYn1H4hnaudVyYJH9miVhOKhKlExMzw8an6U=";
String strExponent = "AQAB";
byte[] modulusBytes = Base64.decode(strModulus, Base64.DEFAULT);
byte[] exponentBytes = Base64.decode(strExponent, Base64.DEFAULT);

BigInteger modulus = new BigInteger(1, modulusBytes );               
BigInteger exponent = new BigInteger(1, exponentBytes);

RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, exponent);
KeyFactory fact = KeyFactory.getInstance("RSA/ECB/PKCS1Padding");
PublicKey pubKey = fact.generatePublic(rsaPubKey);    

Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);   

byte[] plainBytes = new String("Manchester United").getBytes("UTF-8");
byte[] cipherData = cipher.doFinal(plainBytes); 
encryptedString = Base64.encodeToString(cipherData, Base64.DEFAULT);
}
catch(Exception e){
Log.e("Error", e.toString());
}

return encryptedString;

Java中的相同代码：

try{
        String strModulus = "tr82UfeGetV7yBKcOPjFTWs7pHqqr/5YKKWMUZHG4HnCmWrZsOhuR1FBnMZ/g2YiosoSlu0zd7Ukz9lX7wv2RLfWXfMvZYGpAAvfYWwzbyQ2i1q+tKE/thgKNscoSRellDD+uJcYn1H4hnaudVyYJH9miVhOKhKlExMzw8an6U=";
        String strExponent = "AQAB";
        byte[] modulusBytes = DatatypeConverter.parseBase64Binary("tr82UfeGetV7yBKcOPjFTWs7pHqqr/5YKKWMUZ/HG4HnCmWrZsOhuR1FBnMZ/g2YiosoSlu0zd7Ukz9lX7wv2RLfWXfMvZYGpAAvfYWwzbyQ2i1q+tKE/thgKNscoSRellDD+uJcYn1H4hnaudVyYJH9miVhOKhKlExMzw8an6U=");
        byte[] exponentBytes = DatatypeConverter.parseBase64Binary("AQAB");

        BigInteger modulus = new BigInteger(1, modulusBytes );
        BigInteger exponent = new BigInteger(1, exponentBytes);

        RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, exponent);
        KeyFactory fact = KeyFactory.getInstance("RSA");
        PublicKey pubKey = fact.generatePublic(rsaPubKey);

        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);

        byte[] plainBytes = new String("Manchester United").getBytes("UTF-8");
        byte[] cipherData = cipher.doFinal(plainBytes);
        //String encryptedString = Base64.encodeToString(cipherData, Base64.NO_PADDING);
        String encryptedString = DatatypeConverter.printBase64Binary(cipherData);
        String encryptedData = encryptedString;
    }
    catch(Exception e){
    }       
}

周转基金服务：

公共字符串解密(){ const int PROVIDER_RSA_FULL = 1；const string CONTAINER_NAME = "Tracker"；CspParameters cspParams；cspParams =新CspParameters(PROVIDER_RSA_FULL)；cspParams.KeyContainerName = CONTAINER_NAME；RSACryptoServiceProvider rsa1 =新RSACryptoServiceProvider(cspParams)；CONTAINER_NAME字符串data2Decrypt = "LyVNDhkdJ5jNgwZDiVZ1R0lmd10AQgqNDFHh2vJB1676eg8wj0MOdTyChAGrvEjha0uXg+f/aNBAc4+/LFbCgsA1e+O3wnXr27sXznGJ9G15avZzQHG4JWUS42MXBahAkcJ80pcihTbL9edfQCkEuj9RzQ/zFJyDEMssfd/EPDM="；byte[] encyrptedBytes = Convert.FromBase64String(data2Decrypt)；byte[] plain =rsa1.DecUpt(encyrptedBytes，false)；string decryptedString =Systemt.ext.Encoding.UTF8.GetString(平原)；}

原始数据：‘曼彻斯特联队’

奇怪的是，如果我用Java代码加密字符串，它可以在WCF服务端解密，但是，如果使用上述Android代码加密，则解密将提供错误：“要解密的数据超过此128字节模数的最大值”。

在调试过程中，我意识到安卓和Java的byte[] cipherData是不同的。所有以前的值碰巧是同步的。这会在Java和Android中生成不同的加密字符串。

我的问题是为什么会发生这种事？有愚蠢的错误吗？有办法解决这个问题吗？或者在Android中可以做些什么来获得“密码数据”，对吗？

任何帮助都将不胜感激。

Answer 1

您在Android上使用的是不同的填充。在Android上也使用完全相同的填充：

Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");