java - android和php之间的非对称加密

Question

以下非对称函数用于在android中加密和解密..它工作得很好。然而，当我使用下面的函数加密并使用 php 或另一个函数解密(这与使用 eclipse 非常相似).. 我得到 null .. 错误的填充异常 .. 我无法弄清楚问题 .. 因为我正在对结果进行编码..为什么只有当我在android或eclipse中加密和解密时它才起作用..但在php和android之间或简单地在两个java程序之间不起作用..但在eclipse和android上..

Android 程序:

public  String encryptAsymmetric(String input, Key key) throws GeneralSecurityException, IOException {
    byte[] crypted = null;
    try{

        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        crypted = cipher.doFinal(input.getBytes());
    }catch(Exception e){
        System.out.println(e.toString());
    }//Base64.encodeBase64(crypted)

    return new String(Base64.encode(crypted, Base64.DEFAULT));
}
public  String decryptAsymmetric(String input, Key key){
    byte[] output = null;
    try{

        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, key);//Base64.decodeBase64(input.getBytes())
        output = cipher.doFinal(Base64.decode(input.getBytes(), Base64.DEFAULT));
    }catch(Exception e){
        System.out.println(e.toString());
    }
    return new String(output);
}

Eclipse(以及 Java 程序):

public static String encryptAsymmetric(String input, Key key){
      byte[] crypted = null;

      try{

          Cipher cipher = Cipher.getInstance("RSA");
          cipher.init(Cipher.ENCRYPT_MODE, key);
          crypted = cipher.doFinal(input.getBytes());
        }catch(Exception e){
            System.out.println(e.toString());
        }//Base64.encodeBase64(crypted)
        return new String(Base64.getEncoder().encode(crypted));
    }
public static String decryptAsymmetric(String input, Key key){
    byte[] output = null;
    try{

      Cipher cipher = Cipher.getInstance("RSA");
      cipher.init(Cipher.DECRYPT_MODE, key);//Base64.decodeBase64(input.getBytes())
      output = cipher.doFinal(Base64.getDecoder().decode(input.getBytes()));
    }catch(Exception e){
      System.out.println(e.toString());
    }
    return new String(output);
}

Answer 1

正如 @James 在评论中提到的，input.getBytes 和 getInstance 不可移植。我通过添加 UTf-8 并编写了 RSA/ECB/PKCS1Padding 而不是 RSA 来更改代码，它解决了我的问题。

 public  String encryptAsymmetric(String input, Key key) throws GeneralSecurityException, IOException {
    byte[] crypted = null;
    try{
        byte[] bytes = input.getBytes("UTF-8");
        //String text = new String(bytes, "UTF-8");
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        crypted = cipher.doFinal(bytes);
    }catch(Exception e){
        System.out.println(e.toString());
    }//Base64.encodeBase64(crypted)

    return new String(Base64.encode(crypted, Base64.DEFAULT));
}
public  String decryptAsymmetric(String input, Key key){
    byte[] output = null;
    try{

        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.DECRYPT_MODE, key);//Base64.decodeBase64(input.getBytes())
        output = cipher.doFinal(Base64.decode(input.getBytes("UTf-8"), Base64.DEFAULT));
    }catch(Exception e){
        System.out.println(e.toString());
    }
    return new String(output);
}