AES是分組密鑰，算法輸入128位數(shù)據(jù)，密鑰長(zhǎng)度也是128位。用Nr表示對(duì)一個(gè)數(shù)據(jù)分組加密的輪數(shù)（加密輪數(shù)與密鑰長(zhǎng)度的關(guān)系如表1所列）。每一輪都需要一個(gè)與輸入分組具有相同長(zhǎng)度的擴(kuò)展密鑰Expandedkey(i)的參與。

分享一個(gè)標(biāo)準(zhǔn)PHP的AES加密算法類，其中mcrypt_get_block_size('rijndael-128', 'ecb');，如果在不明白原理的情況下比較容易搞錯(cuò)，可以通過mcrypt_list_algorithms函數(shù)查看你需要的加密算法標(biāo)識(shí)。

<?php
/**
?* AES128加解密類
?* @author dy
?*
?*/
defined('InEjbuy') or exit('Access Invalid!');
class Aes{
??? //密鑰
??? private $_secrect_key;
??? public function __construct(){
??????? $this->_secrect_key = 'MYgGnQE2jDFADSFFDSEWsdD';
??? }
??? /**
???? * 加密方法
???? * @param string $str
???? * @return string
???? */
??? public function encrypt($str){
??????? //AES, 128 ECB模式加密數(shù)據(jù)
??????? $screct_key = $this->_secrect_key;
??????? $screct_key = base64_decode($screct_key);
??????? $str = trim($str);
??????? $str = $this->addPKCS7Padding($str);
??????? $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,MCRYPT_MODE_ECB),MCRYPT_RAND);
??????? $encrypt_str =? mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_ECB, $iv);
??????? return base64_encode($encrypt_str);
??? }
??? /**
???? * 解密方法
???? * @param string $str
???? * @return string
???? */
??? public function decrypt($str){
??????? //AES, 128 ECB模式加密數(shù)據(jù)
??????? $screct_key = $this->_secrect_key;
??????? $str = base64_decode($str);
??????? $screct_key = base64_decode($screct_key);
??????? $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,MCRYPT_MODE_ECB),MCRYPT_RAND);
??????? $encrypt_str =? mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_ECB, $iv);
??????? $encrypt_str = trim($encrypt_str);
??????? $encrypt_str = $this->stripPKSC7Padding($encrypt_str);
??????? return $encrypt_str;
??? }
??? /**
???? * 填充算法
???? * @param string $source
???? * @return string
???? */
??? function addPKCS7Padding($source){
??????? $source = trim($source);
??????? $block = mcrypt_get_block_size('rijndael-128', 'ecb');
??????? $pad = $block - (strlen($source) % $block);
??????? if ($pad <= $block) {
??????????? $char = chr($pad);
??????????? $source .= str_repeat($char, $pad);
??????? }
??????? return $source;
??? }
??? /**
???? * 移去填充算法
???? * @param string $source
???? * @return string
???? */
??? function stripPKSC7Padding($source){
??????? $source = trim($source);
??????? $char = substr($source, -1);
??????? $num = ord($char);
??????? if($num==62)return $source;
??????? $source = substr($source,0,-$num);
??????? return $source;
??? }
}

PHP AES算法的通用函數(shù)

 function aesEncrypt($data, $key, $iv) {
    $cipher = "aes-256-cbc";
    $padding = OPENSSL_PKCS1_PADDING;
    $encrypted = openssl_encrypt($data, $cipher, $key, $padding, $iv);
    return base64_encode($encrypted);
}
function aesDecrypt($data, $key, $iv) {
    $cipher = "aes-256-cbc";
    $padding = OPENSSL_PKCS1_PADDING;
    $decrypted = openssl_decrypt(base64_decode($data), $cipher, $key, $padding, $iv);
    return $decrypted;
}

該函數(shù)使用AES-256-CBC加密算法和PKCS1填充模式。它需要三個(gè)參數(shù)：要加密/解密的數(shù)據(jù)，密鑰和初始化向量（IV）。在加密時(shí)，數(shù)據(jù)將被加密并返回Base64編碼的字符串。在解密時(shí)，Base64編碼的字符串將被解碼并返回原始數(shù)據(jù)。

以上就是本文所述的全部?jī)?nèi)容了，希望對(duì)大家學(xué)習(xí)php的AES加密算法類有所幫助。

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