java - 使用 AES 和 Cipher 将 java 代码转换为 php

Question

我发现将一段代码从 java 转换为 php 很困难。 我在互联网上搜索了我的java代码示例中编写的每一行代码的含义，但我没有找到任何内容。 我想了解这个特定示例中每一行的作用。

这是我尝试过的。

function my_aes_encrypt($key, $data) {
 if(16 !== strlen($key)) $key = hash('MD5', $key, true);
 $padding = 16 - (strlen($data) % 16);
     $data .= str_repeat(chr($padding), $padding);
     return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $data, MCRYPT_MODE_ECB, str_repeat("\0", 16)));
 }
function my_aes_decrypt($str, $key){ 
     $str = base64_decode($str);
     $str = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $str, MCRYPT_MODE_ECB);
     $block = mcrypt_get_block_size('rijndael_128', 'ecb');
     $pad = ord($str[($len = strlen($str)) - 1]);
     $len = strlen($str);
     $pad = ord($str[$len-1]);
     return substr($str, 0, strlen($str) - $pad);
}

从 Java 转换为 PHP

//provided key 
byte[] keyBinary = DatatypeConverter.parseBase64Binary("r/RloSflFkLj3Pq2gFmdBQ==");  
SecretKey secret = new SecretKeySpec(keyBinary, "AES");    

// encrypted string   
byte[] bytes = DatatypeConverter.parseBase64Binary("IKWpOq9rhTAz/K1ZR0znPA=="); 

// iv 
byte[] iv = DatatypeConverter.parseBase64Binary("yzXzUhr3OAt1A47g7zmYxw==");       
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); 
cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv)); 
String msisdn = new String(cipher.doFinal(bytes), "UTF-8"); 

如果你们能让我知道用 Java 编写的每一行的详细信息，那就太好了。

Answer 1

Java 和 PHP 代码的功能有很大不同。首先，Java 代码仅包含解密部分，而 PHP 部分包含加密和解密部分。与 Java 代码相反，在 PHP-my_aes_decrypt 方法中，似乎使用不安全的 ECB 模式 ( https://crypto.stackexchange.com/questions/20941/why-shouldnt-i-use-ecb-encryption ) 而不是 CBC 模式，因此不涉及 IV。不太重要但仍然不同的是， key 似乎没有经过 Base64 编码，因为它没有在任何地方进行解码。此外，在 PHP 代码中，使用了诸如 mcrypt_encrypt ( http://php.net/manual/de/function.mcrypt-encrypt.php ) 之类的已弃用方法或诸如 MD5 ( https://en.wikipedia.org/wiki/MD5 ) 之类的加密弱算法。

如果我没猜错的话，Java 代码是引用代码，您需要 PHP 对应代码。因此，我专注于 Java 代码，完全忽略不同且过时的 PHP 代码。

在 Java 代码中， key 、数据和 IV 均经过 Base64 编码，然后进行解码，然后使用这些解码数据对加密数据进行解密。

用于解密的可能的 PHP 对应部分可能是:

<?php
$keyBinary = base64_decode('r/RloSflFkLj3Pq2gFmdBQ==');                                 // decode base64-encoded key in a string (internally, PHP strings are byte arrays)
$bytes = base64_decode('IKWpOq9rhTAz/K1ZR0znPA==');                                     // decode base64-encoded encrypted data in a string
$iv = base64_decode('yzXzUhr3OAt1A47g7zmYxw==');                                        // decode base64-encoded IV in a string   
$msisdn = openssl_decrypt($bytes, 'AES-128-CBC', $keyBinary, OPENSSL_RAW_DATA, $iv);    // decrypt data using AES-128, CBC-mode and PKCS7-Padding (default-padding)
                                                                                        // - when OPENSSL_RAW_DATA is specified raw data are returned, otherwise base64-encoded data (= default)
                                                                                        // - when OPENSSL_ZERO_PADDING is specified no padding is used, otherwise PKCS7-padding (= default)
                                                                                        // - The value XXX in AES-XXX-CBC is determined by the length of the key in Bit used in the Java-code,
                                                                                        //   e.g. for a 32 Byte (256 Bit)-key AES-256-CBC has to be used.  
print $msisdn."\n"; // Output: 1234567                                                  // print decrypted data

可以在注释中找到所需的 Java 代码解释:

//provided key 
byte[] keyBinary = DatatypeConverter.parseBase64Binary("r/RloSflFkLj3Pq2gFmdBQ==");     // decode base64-encoded key in a byte-array
SecretKey secret = new SecretKeySpec(keyBinary, "AES");                                 // create AES-key from byte-array (currently 16 Byte = 128 Bit long) 

// encrypted string    
byte[] bytes = DatatypeConverter.parseBase64Binary("IKWpOq9rhTAz/K1ZR0znPA==");         // decode base64-encoded encrypted data in a byte-array

// iv
byte[] iv = DatatypeConverter.parseBase64Binary("yzXzUhr3OAt1A47g7zmYxw==");            // decode base64-encoded IV in a byte-array     
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");                             // create cipher-instance for using AES in CBC-mode with PKCS5-Padding (Java counterpart to PKCS7)
cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv));                      // initialize cipher-instance for decryption with specified AES-key and IV (the latter created from corresponding byte-array) 
String msisdn = new String(cipher.doFinal(bytes), "UTF-8");                             // decrypt data using AES-128 (128 determined by length of used key in Bit), CBC-mode and PKCS5-Padding, 
                                                                                        // and put them in a UTF-8 string
System.out.println(msisdn); // Output: 1234567                                          // print decrypted data

PHP 加密部分可能是:

<?php
$keyBinary = base64_decode('r/RloSflFkLj3Pq2gFmdBQ==');                                 
$msisdn = '1234567';                                                                    // plain text
$iv = openssl_random_pseudo_bytes(16);                                                  // generate random IV
//$iv = base64_decode('yzXzUhr3OAt1A47g7zmYxw==');                                      // use this line for tests with your base64-encoded test-IV yzXzUhr3OAt1A47g7zmYxw==   
$bytes = openssl_encrypt($msisdn, 'AES-128-CBC', $keyBinary, OPENSSL_RAW_DATA, $iv);    // encrypt data using AES-128, CBC-mode and PKCS7-Padding (default-padding) 
$ivBase64 = base64_encode($iv);                                                         // base64-encode IV
$bytesBase64 = base64_encode($bytes);                                                   // base64-encode encrypted data
print $ivBase64."\n".$bytesBase64."\n";                                                 // print base64-encoded IV and encrypted data