Java的：与java.util.Base64 VS android.util.Base64解码的base64字符串时，不同的结果 [英] Java: Different results when decoding base64 string with java.util.Base64 vs android.util.Base64

问题描述

我的工作一个客户机/服务器系统上，我试图做一些基本的加密。当我连接到服务器，我送一个公钥通过套接字转义字符串。我已经验证该字符串的相同的两端，换行和所有即可。

I'm working on a client/server system and I'm trying to do some basic encryption. When I connect to the server, I send a public key as an escaped string across the socket. I've verified that the string is identical on both ends, newlines and all.

在客户端（Android的），我能够使用公共/专用密钥成功地加密和解密的密钥（用于测试目的）。但是，服务器当试图去code从字符串到一个byte []公钥与失败右出了大门：

On the client (Android), I'm able to use the public/private keys to successfully encrypt and decrypt a secret key (for testing purposes). However, the server fails right out of the gate when trying to decode the public key from a String to a byte[], with:

 java.lang.IllegalArgumentException: Illegal base64 character a

这似乎是preposterous，作为A绝对是一个base64字符，如果我理解正确。客户端和服务器使用共享库来处理所有的加密，所以code是几乎相同的。在仅的区别在于编码/解码的base64字符串，因为java.util.Base64是在Android上不可用。

which seems preposterous, as 'a' is absolutely a base64 character, if I understand correctly. The client and server use a shared library to handle all encryption, so the code is nearly identical. The only difference is encoding/decoding base64 Strings, since java.util.Base64 is unavailable on Android.

共享类

public abstract class EasyCrypt {

...

    public PublicKey loadPublicKey(String key64) throws GeneralSecurityException {

        byte[] data = decode(key64); //Calls abstract methods, shown below

        X509EncodedKeySpec spec = new X509EncodedKeySpec(data);
        KeyFactory fact = KeyFactory.getInstance("RSA");
        return fact.generatePublic(spec);
    }

...

}

客户端（Android版）方法

import android.util.Base64;

public class ClientCrypt extends EasyCrypt {
    @Override
    protected byte[] decode(String s) {
        return Base64.decode(s.getBytes(), Base64.DEFAULT); //Works perfectly
    }

    @Override
    protected String encode(byte[] bytes) {
        return Base64.encodeToString(bytes, Base64.DEFAULT);
    }

}

服务器（Linux）的方法

import java.util.Base64;

public class ServerCrypt extends EasyCrypt{
    @Override
    public byte[] decode(String str){
        return Base64.getDecoder().decode(str); //Throws IllegalArgumentException
    }

    @Override
    public String encode(byte[] bytes){
        return Base64.getEncoder().encodeToString(bytes);
    }

}

推荐答案

在Android上，使用 Base64.NO_WRAP 而不是 Base64.DEFAULT

On android, Use Base64.NO_WRAP instead of Base64.DEFAULT

@Override
protected String encode(byte[] bytes) {
    return Base64.encodeToString(bytes, Base64.NO_WRAP);
}

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