<?php 
 
function aes_decode($message, $encodingaeskey = '', $appid = '') { 
 $key = base64_decode($encodingaeskey . '='); 
 
 $ciphertext_dec = base64_decode($message); 
 $iv = substr($key, 0, 16); 
 
 $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, ''); 
 mcrypt_generic_init($module, $key, $iv); 
 $decrypted = mdecrypt_generic($module, $ciphertext_dec); 
 mcrypt_generic_deinit($module); 
 mcrypt_module_close($module); 
 
 $pad = ord(substr($decrypted, -1)); 
 if ($pad < 1 || $pad > 32) { 
 $pad = 0; 
 } 

<?php 
 
function aes_decode($message, $encodingaeskey = '', $appid = '') { 
 $key = base64_decode($encodingaeskey . '='); 
 
 $ciphertext_dec = base64_decode($message); 
 $iv = substr($key, 0, 16); 
 
 /* mcrypt对称解密代码在PHP7.1已经被抛弃了，所以使用下面的openssl来代替 
 $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, ''); 
 mcrypt_generic_init($module, $key, $iv); 
 $decrypted = mdecrypt_generic($module, $ciphertext_dec); 
 mcrypt_generic_deinit($module); 
 mcrypt_module_close($module); 
 */ 
 $decrypted = openssl_decrypt($ciphertext_dec, 'AES-256-CBC', $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv); 
 
 $pad = ord(substr($decrypted, -1)); 
 if ($pad < 1 || $pad > 32) { 
 $pad = 0; 
 } 

<?php 
function aes_encode($message, $encodingaeskey = '', $appid = '') { 
 $key = base64_decode($encodingaeskey . '='); 
 $text = random(16) . pack("N", strlen($message)) . $message . $appid; 
 $iv = substr($key, 0, 16); 
 
 $block_size = 32; 
 $text_length = strlen($text); 
 $amount_to_pad = $block_size - ($text_length % $block_size); 
 if ($amount_to_pad == 0) { 
 $amount_to_pad = $block_size; 
 } 
 $pad_chr = chr($amount_to_pad); 
 $tmp = ''; 
 for ($index = 0; $index < $amount_to_pad; $index++) { 
 $tmp .= $pad_chr; 
 } 
 $text = $text . $tmp; 
 $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC); 
 $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, ''); 
 mcrypt_generic_init($module, $key, $iv); 
 $encrypted = mcrypt_generic($module, $text); 
 mcrypt_generic_deinit($module); 
 mcrypt_module_close($module); 
 
 $encrypt_msg = base64_encode($encrypted); 
 return $encrypt_msg; 
} 

<?php 
function aes_encode($message, $encodingaeskey = '', $appid = '') { 
 $key = base64_decode($encodingaeskey . '='); 
 $text = random(16) . pack("N", strlen($message)) . $message . $appid; 
 $iv = substr($key, 0, 16); 
 
 $block_size = 32; 
 $text_length = strlen($text); 
 $amount_to_pad = $block_size - ($text_length % $block_size); 
 if ($amount_to_pad == 0) { 
 $amount_to_pad = $block_size; 
 } 
 $pad_chr = chr($amount_to_pad); 
 $tmp = ''; 
 for ($index = 0; $index < $amount_to_pad; $index++) { 
 $tmp .= $pad_chr; 
 } 
 $text = $text . $tmp; 
 /* mcrypt对称加密代码在PHP7.1已经被抛弃了，所以使用下面的openssl来代替 
 $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC); 
 $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, ''); 
 mcrypt_generic_init($module, $key, $iv); 
 $encrypted = mcrypt_generic($module, $text); 
 mcrypt_generic_deinit($module); 
 mcrypt_module_close($module); 
 */ 
 
 $encrypted = openssl_encrypt($text, 'AES-256-CBC', $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv); 
 $encrypt_msg = base64_encode($encrypted); 
 return $encrypt_msg; 
}