80 lines
2.0 KiB
PHP
80 lines
2.0 KiB
PHP
<?php
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namespace app\lib;
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class DesCrypto
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{
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private $key;
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private $iv;
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/**
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* 构造函数（集成固定密钥和向量）
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*/
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public function __construct($key, $iv)
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{
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// 使用您提供的固定密钥
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$this->key = $this->padToLength($key, 8);
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// 使用您提供的固定向量
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$this->iv = $this->padToLength($iv, 8);
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}
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/**
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* DES加密（CBC模式 + PKCS5Padding）
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* @param string $data 待加密数据
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* @return string Base64编码的加密结果
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*/
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public function encrypt($data)
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{
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// 添加PKCS5填充
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$blockSize = 8;
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$pad = $blockSize - (strlen($data) % $blockSize);
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$data .= str_repeat(chr($pad), $pad);
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// 执行加密
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$encrypted = openssl_encrypt(
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$data,
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'DES-CBC',
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$this->key,
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OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
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$this->iv
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);
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return base64_encode($encrypted);
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}
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/**
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* DES解密
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* @param string $base64Data Base64编码的加密数据
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* @return string 解密后的原始数据
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*/
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public function decrypt($base64Data)
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{
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$encrypted = base64_decode($base64Data);
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// 执行解密
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$decrypted = openssl_decrypt(
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$encrypted,
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'DES-CBC',
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$this->key,
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OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
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$this->iv
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);
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// 移除PKCS5填充
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$pad = ord($decrypted[strlen($decrypted) - 1]);
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return substr($decrypted, 0, -$pad);
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}
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/**
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* 辅助方法：填充/截断字符串到指定长度
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* @param string $str 输入字符串
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* @param int $length 目标长度
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* @return string 处理后的字符串
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*/
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private function padToLength($str, $length)
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{
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if (strlen($str) > $length) {
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return substr($str, 0, $length);
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}
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return str_pad($str, $length, "\0");
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}
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} |