CipherInputStream / CipherOutputStream的最后一个块不完整，即使使用填充AES / CBC / PKCS5Padding [英] last block incomplete with CipherInputStream/CipherOutputStream, even with padding AES/CBC/PKCS5Padding

问题描述

实际上，我从互联网和stackoverflow中搜索了很多，

Actually, I searched lot from internet and in stackoverflow too for this,

最初我没有在加密和解密中使用填充，

Initially I don't used padding in my encryption and decryption,

但最后我从这里得到解决方案

But Finally I got solution from here

https://stackoverflow.com/a/10775577/1115788

，我更新了我的代码，填充为AES / CBC / PKCS5Padding
和相同的错误即将到来，最后一个块不解密...

and I updated my code with padding as AES/CBC/PKCS5Padding and the same error is coming, and last block is not decrypted...

我在过去两天正在处理这个问题，但找不到解决方案

I'm working on this for last two day, but no solution found

我的密码：

package mani.droid.browsedropbox;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class Crypter {

    Cipher encipher;
    Cipher decipher;
CipherInputStream cis;
CipherOutputStream cos;
FileInputStream fis;
byte[] ivbytes = new byte[]{(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e',                                                                                          (byte)'f', (byte)'g', (byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m',     (byte)'n', (byte)'o', (byte)'p'};
    IvParameterSpec iv = new IvParameterSpec(ivbytes);

public boolean enCrypt(String key, InputStream is, OutputStream os)
{
    try {
        byte[] encoded = new BigInteger(key, 16).toByteArray();
        SecretKey seckey = new SecretKeySpec(encoded, "AES");
        encipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
        encipher.init(Cipher.ENCRYPT_MODE, seckey, iv);
        cis = new CipherInputStream(is, encipher);
        copyByte(cis, os);
        return true;
    } 
    catch (InvalidKeyException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (InvalidAlgorithmParameterException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return false;
}

public boolean deCrypt(String key, InputStream is, OutputStream os)
{
    try {
        byte[] encoded = new BigInteger(key, 16).toByteArray();
        SecretKey seckey = new SecretKeySpec(encoded, "AES");
        encipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
        encipher.init(Cipher.DECRYPT_MODE, seckey, iv);
        cos = new CipherOutputStream(os, encipher);
        copyByte(is, cos);
        //cos.close();
        return true;
    } 
    catch (InvalidKeyException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (InvalidAlgorithmParameterException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return false;
}

public void copyByte(InputStream is, OutputStream os) throws IOException
{
    byte[] buf = new byte[8192];
    int numbytes;
    while((numbytes = is.read(buf)) != -1)
    {
        os.write(buf, 0, numbytes);
        os.flush();
    }
    os.close();
    is.close();
}
}

推荐答案

我得到了我自己的问题的答案，尝试和错误
实际上这里冲突是我设置填充在 encipher = Cipher.getInstance（AES / CBC / PKCS7Padding）;

Finally I got answer for my own question, with trial and error Actually here Conflict is I set Padding in encipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

并设置一些值.....，

and Set IV with some values.....,

最后我只有答案只替换算法

Finally I got Answer only just replaced the Algorithm

从：

AES / CBC / PKCS7Paddinng

AES/CBC/PKCS7Paddinng

To：

AES / CFB8 / NoPadding

AES/CFB8/NoPadding

，它的工作就像魅力....所以我建议这个答案为其他人谁挣扎着这个问题，如果你解决了你的问题在这里提到别人...

and its worked like charm...., So I suggest this answer for others who struggling with this problem, if you solved you problem, mention here for others...

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