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81 lines
1.7 KiB
PHTML
81 lines
1.7 KiB
PHTML
5 years ago
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<?php
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/**
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* 加密工具类
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*
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* User: jiehua
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* Date: 16/3/30
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* Time: 下午3:25
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*/
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/**
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* 加密方法
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* @param string $str
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* @return string
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*/
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function encrypt($str, $screct_key)
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{
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//AES, 128 模式加密数据 CBC
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$screct_key = base64_decode($screct_key);
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$str = trim($str);
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$str = addPKCS7Padding($str);
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//设置全0的IV
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$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
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$iv = str_repeat("\0", $iv_size);
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$encrypt_str = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_CBC, $iv);
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return base64_encode($encrypt_str);
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}
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/**
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* 解密方法
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* @param string $str
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* @return string
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*/
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function decrypt($str, $screct_key)
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{
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//AES, 128 模式加密数据 CBC
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$str = base64_decode($str);
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$screct_key = base64_decode($screct_key);
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//设置全0的IV
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$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
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$iv = str_repeat("\0", $iv_size);
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$decrypt_str = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_CBC, $iv);
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$decrypt_str = stripPKSC7Padding($decrypt_str);
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return $decrypt_str;
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}
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/**
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* 填充算法
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* @param string $source
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* @return string
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*/
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function addPKCS7Padding($source)
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{
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$source = trim($source);
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$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
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$pad = $block - (strlen($source) % $block);
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if ($pad <= $block) {
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$char = chr($pad);
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$source .= str_repeat($char, $pad);
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}
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return $source;
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}
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/**
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* 移去填充算法
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* @param string $source
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* @return string
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*/
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function stripPKSC7Padding($source)
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{
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$char = substr($source, -1);
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$num = ord($char);
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if ($num == 62) return $source;
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$source = substr($source, 0, -$num);
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return $source;
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}
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