RSA加密：Java和Android的区别 [英] RSA Encryption: Difference between Java and Android

问题描述

我使用RSA加密的用户名和密码在Android和解密他们在服务器上（的Tomcat 6，JAVA 1.6）。 Android的加密：

I am using RSA to encrypt username and password on Android and decrypt them on server (tomcat 6, java 1.6). Android Encryption:

    PublicKey pubKey = readPublicKeyFromFile(mod, ex);
    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.ENCRYPT_MODE, pubKey);
    byte[] cipherData = cipher.doFinal(data);
    return cipherData;

Java的Tomcat的解密：

Java Tomcat Decryption:

    PrivateKey pubKey = readPrivateKeyFromFile(mod, ex);
    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.DECRYPT_MODE, pubKey);
    byte[] cipherData = cipher.doFinal(data);
    return cipherData;

如果我用的是android的部分外的Andr​​oid（只是在main方法），它工作正常。但不是我的Andr​​oid（仿真器）内。在德服务器端出现以下错误：

If I use the android part OUTSIDE android (Just in a main method) it works fine. But not inside my android (Emulator). On de server side I get the following error:

javax.crypto.BadPaddingException: Blocktype mismatch: 0
    at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:311)
    at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:255)
    at com.sun.crypto.provider.RSACipher.a(DashoA13*..)
    at com.sun.crypto.provider.RSACipher.engineDoFinal(DashoA13*..)
    at javax.crypto.Cipher.doFinal(DashoA13*..)

我把mod和前因为BigIntegers常数，所以我不把它们写在一个文件中。 我知道有java1.6和java 1.5加密之间的差异，因此两者都与Java 1.6编译。

I keep the mod and ex as BigIntegers constants so I don't write them in to a file. I know that there are difference between java1.6 and java 1.5 encryption, so both are compiled with java 1.6.

一些调试信息：

在调试Android中我可以看到PUBKEY包含系数和指数的十六进制。如果我调试的主要方法（再次同code）我可以看到PUBKEY包含系数和指数以十进制。

During debug in android I can see that pubKey contains modulus and exponent in hexadecimal. And if I debug in a main method (again the same code) I can see that pubKey contains modulus and exponent in decimal.

我是什么做错了吗？

感谢

推荐答案

Im做RSA加密的安卓2.2+和解密在一个Tomcat 6 Java 1.6的服务器。

Im doing RSA Encrypt in Android 2.2+ and decrypt on a tomcat 6 java 1.6 server.

我得到这个确切的问题，看完所有的地方，部分归功于@Femi的答案，我碰到我需要的东西。

I was getting this exact problem, reading all over the place and in part thanks to @Femi 's answer I came across what I needed.

解决的办法是使用如下因素的init的密码：

The solution was to use the folowing init for the Cipher:

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

该工程从Android和BlackBerry智能手机做加密。我知道它已经四个月有人问，但以防万一别人穿过这个问题。

This works doing encryption from both Android and BlackBerry smartphones. I know its been four months since the question was asked, but just in case someone else goes through this problem.

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