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我一直试图使用AES-128 CBC解密一个字符串，该字符串最初使用JAVA AES加密进行了加密。在java中使用PKCS7填充。我试图使用类似的PHP代码进行加密和解密。但我得到不同的结果。Java中的AES 128加密解密PHP中的
我的Java代码
import java.security.MessageDigest;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import android.util.Base64;
/**
* @author vipin.cb , [email protected] <br>
* Sep 27, 2013, 5:18:34 PM <br>
* Package:- <b>com.veebow.util</b> <br>
* Project:- <b>Veebow</b>
* <p>
*/
public class AESCrypt {
private final Cipher cipher;
private final SecretKeySpec key;
private AlgorithmParameterSpec spec;
public static final String SEED_16_CHARACTER = "U1MjU1M0FDOUZ.Qz";
public AESCrypt() throws Exception {
// hash password with SHA-256 and crop the output to 128-bit for key
MessageDigest digest = MessageDigest.getInstance("SHA-256");
digest.update(SEED_16_CHARACTER.getBytes("UTF-8"));
byte[] keyBytes = new byte[32];
System.arraycopy(digest.digest(), 0, keyBytes, 0, keyBytes.length);
cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
key = new SecretKeySpec(keyBytes, "AES");
spec = getIV();
}
public AlgorithmParameterSpec getIV() {
byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
IvParameterSpec ivParameterSpec;
ivParameterSpec = new IvParameterSpec(iv);
return ivParameterSpec;
}
public String encrypt(String plainText) throws Exception {
cipher.init(Cipher.ENCRYPT_MODE, key, spec);
byte[] encrypted = cipher.doFinal(plainText.getBytes("UTF-8"));
String encryptedText = new String(Base64.encode(encrypted,
Base64.DEFAULT), "UTF-8");
return encryptedText;
}
public String decrypt(String cryptedText) throws Exception {
cipher.init(Cipher.DECRYPT_MODE, key, spec);
byte[] bytes = Base64.decode(cryptedText, Base64.DEFAULT);
byte[] decrypted = cipher.doFinal(bytes);
String decryptedText = new String(decrypted, "UTF-8");
return decryptedText;
}
}
，我使用了相当于PHP代码。
<?php
class MCrypt {
private $iv = '0000000000000000'; #Same as in JAVA
private $key = 'U1MjU1M0FDOUZ.Qz'; #Same as in JAVA
function __construct() {
$this->key = hash('sha256', $this->key, true);
}
function encrypt($str) {
$iv = $this->iv;
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
mcrypt_generic_init($td, $this->key, $iv);
$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$pad = $block - (strlen($str) % $block);
$str .= str_repeat(chr($pad), $pad);
$encrypted = mcrypt_generic($td, $str);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return base64_encode($encrypted);
}
function decrypt($code) {
$iv = $this->iv;
$td = mcrypt_module_open('rijndael-128', '', 'cbc', '');
mcrypt_generic_init($td, $this->key, $iv);
$str = mdecrypt_generic($td, base64_decode($code));
$block = mcrypt_get_block_size('rijndael-128', 'cbc');
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $str;
//return $this->strippadding($str);
}
/*
For PKCS7 padding
*/
private function addpadding($string, $blocksize = 16) {
$len = strlen($string);
$pad = $blocksize - ($len % $blocksize);
$string .= str_repeat(chr($pad), $pad);
return $string;
}
private function strippadding($string) {
$slast = ord(substr($string, -1));
$slastc = chr($slast);
$pcheck = substr($string, -$slast);
if (preg_match("/$slastc{" . $slast . "}/", $string)) {
$string = substr($string, 0, strlen($string) - $slast);
return $string;
} else {
return false;
}
}
}
$encryption = new MCrypt();
echo $encryption->encrypt('123456') . "<br/>";
echo $encryption->decrypt('tpyxISJ83dqEs3uw8bN/+w==');
在Java
明文= 123456
密文= tpyxISJ83dqEs3uw8bN/+ W ==
在PHP
明文= 123456
密文= IErqfTCktrnmWndOpq3pnQ ==
当我尝试使用PHP解密对Java加密文本“tpyxISJ83dqEs3uw8bN/+ w ==”进行解密时，我是ge如果我删除了填充，则为空数组。没有删除填充，我得到“::::::::::”
我认为在PHP和Java中使用的IV字节有一些错误 任何人都可以帮助我解决这个问题。我尝试了很多组合。仍然没有结果。我对Java概念非常陌生。
------解决方案-------
我已经根据owlstead给出的意见修改我的PHP类。可能有更好的办法。我在这里发布它，以便有人可能会在未来发现它有帮助，并且欢迎您的意见以进一步改进。
<?php
class MCrypt {
private $hex_iv = '00000000000000000000000000000000'; # converted Java byte code in to HEX and placed it here
private $key = 'U1MjU1M0FDOUZ.Qz'; #Same as in JAVA
function __construct() {
$this->key = hash('sha256', $this->key, true);
//echo $this->key.'<br/>';
}
function encrypt($str) {
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$pad = $block - (strlen($str) % $block);
$str .= str_repeat(chr($pad), $pad);
$encrypted = mcrypt_generic($td, $str);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return base64_encode($encrypted);
}
function decrypt($code) {
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
$str = mdecrypt_generic($td, base64_decode($code));
$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $this->strippadding($str);
}
/*
For PKCS7 padding
*/
private function addpadding($string, $blocksize = 16) {
$len = strlen($string);
$pad = $blocksize - ($len % $blocksize);
$string .= str_repeat(chr($pad), $pad);
return $string;
}
private function strippadding($string) {
$slast = ord(substr($string, -1));
$slastc = chr($slast);
$pcheck = substr($string, -$slast);
if (preg_match("/$slastc{" . $slast . "}/", $string)) {
$string = substr($string, 0, strlen($string) - $slast);
return $string;
} else {
return false;
}
}
function hexToStr($hex)
{
$string='';
for ($i=0; $i < strlen($hex)-1; $i+=2)
{
$string .= chr(hexdec($hex[$i].$hex[$i+1]));
}
return $string;
}
}
$encryption = new MCrypt();
echo $encryption->encrypt('123456') . "<br/>";
echo $encryption->decrypt('tpyxISJ83dqEs3uw8bN/+w==');
谢谢。这正是我所期待的。在我的钥匙中修正了一个错字，然后马上放弃！ – ssdscott
@ssdscott我很高兴它帮助你，甚至在发布2年后:) – shanavascet