garden_server/extend/crypt/Des.php

<?php

namespace crypt;

class Des {
	
	/**
	 * @uses des 加密 cbc模式
	 * @param string $str
	 * @param string $key
	 * @return string
	 */
	public static function encrypt($str, $key)
	{
		$str = self::pkcsPadding($str, 8);
		$v = pack('H*', "1234567890abcdef");
		$key = str_pad($key, 8, '0'); //3DES加密将8改为24
		$sign = openssl_encrypt($str, 'DES-CBC', $key,OPENSSL_RAW_DATA | OPENSSL_NO_PADDING, $v);
		$sign = base64_encode($sign);
		return $sign;
	}
	
	
	/**
	 * @uses des解密 cbc模式 
	 * @param string $encrypted
	 * @param string $key
	 * @return string
	 */
	public static function decrypt($encrypted, $key)
	{
		$encrypted = base64_decode($encrypted);
		$v = pack('H*', "1234567890abcdef");
		$key = str_pad($key, 8, '0'); //3DES加密将8改为24
		$sign = @openssl_decrypt($encrypted, 'DES-CBC', $key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING, $v);
		$sign = self::unPkcsPadding($sign);
		$sign = rtrim($sign);
		return $sign;
	}
	
	/**
	 * @uses 填充
	 * @param string $str
	 * @param int $blocksize
	 * @return string
	 */
	private static function pkcsPadding($str, $blocksize)
	{
		$pad = $blocksize - (strlen($str) % $blocksize);
		return $str . str_repeat(chr($pad), $pad);
	}
	
	/**
	 * @uses 去填充
	 * @param string $str
	 * @return string
	 */
	private static function unPkcsPadding($str)
	{
		$pad = ord($str{strlen($str) - 1});
		if ($pad > strlen($str)) {
			return false;
		}
		return substr($str, 0, -1 * $pad);
	}
	
}