Java的Andr​​oid的错误＆QUOT;对于RSA块QUOT太多的数据; [英] Java Android Error "too much data for RSA block"

问题描述

一个在我的Andr​​oid项目（RSA加密/解密）的错误。
加密传递OK，但是当我试图解密加密的文本，yhere是一个错误：为RSA块的数据太多

如何解决这个问题呢？

code：

 公共字符串解密（字符串文本）抛出异常
{
    尝试{
        Log.i（Crypto.java:Decrypt，文本）;
        RSAPrivateKey privateKey =（RSAPrivateKey）kp.getPrivate（）;
        密码加密= Cipher.getInstance（RSA / ECB / NoPadding）;
            cipher.init（Cipher.DECRYPT_MODE，privateKey）;
            字节[] =的CipherData cipher.doFinal（text.getBytes（））; //＆LT; ----错误：RSA块数据太多
            字节[] = decryptedBytes cipher.doFinal（的CipherData）;
            字符串解密=新的String（decryptedBytes）;            Log.i（解密，解密）;        返回解密;
    }赶上（例外五）{
        的System.out.println（e.getMessage（））;
    }
    返回null;
}
 

解决方案

您的问题是，你需要连接code /解code密文（只文本在code）如果您想使用文本重新presentation运送它（字符串你的情况）。

试着查找基地64编码在这个网站，应该有很多关于它的信息。恩code解密之前加密和德code之后。你也应该指定您的明文特定的字符编码​​。

最后，你应该可能与对称密码进行加密，并使用RSA加密对称密钥。否则，你可能会耗尽的RSA计算之内的空间，因为公共密钥无法加密比模量（密钥大小）更大的数据。

A have an error in my Android project (RSA encryption/decryption). The encryption passes OK, but when I trying to decrypt encrypted text, yhere are an error: "too much data for RSA block".

How to solve this problem?

code:

public String Decrypt(String text) throws Exception
{
    try{
        Log.i("Crypto.java:Decrypt", text);
        RSAPrivateKey privateKey = (RSAPrivateKey)kp.getPrivate();
        Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            byte[] cipherData = cipher.doFinal(text.getBytes());// <----ERROR: too much data for RSA block
            byte[] decryptedBytes = cipher.doFinal(cipherData);
            String decrypted = new String(decryptedBytes);

            Log.i("Decrypted", decrypted);

        return decrypted;
    }catch(Exception e){
        System.out.println(e.getMessage());
    }
    return null;
}

解决方案

Your issue is that you need to encode/decode the ciphertext (just text in your code) if you want to transport it using a textual representation (String in your case).

Try and look up base 64 encoding on this site, there should be a lot of information about it. Encode after encryption and decode before decryption. You should also specify a specific character encoding for your plaintext.

Finally, you should probably encrypt with a symmetric cipher, and encrypt the symmetric key using RSA. Otherwise you may run out of space within the RSA calculation, because a public key cannot encrypt data larger than its modulus (key size).

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