Tomorrow Man

项目中用到php进行des加密，和java系统进行通讯，结果加密出来的结果不一致。在网上搜寻未果，找到一个aes的加密，大同小异，参考php文档，修改后如下，已进行测试。
和java主要差异在于补位。

<?php
//s777n.net
class DES
{
	var $key;
	var $iv; //偏移量

	function DES( $key, $iv=0 ) {
	//key长度8例如:1234abcd
		$this->key = $key;
		if( $iv == 0 ) {
			$this->iv = $key;
		} else {
			$this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );
		}
	}

	function encrypt($str) {
	//加密，返回大写十六进制字符串
		$size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );
		$str = $this->pkcs5Pad ( $str, $size );
		return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) );
	}

	function decrypt($str) {
	//解密
		$strBin = $this->hex2bin( strtolower( $str ) );
		$str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, MCRYPT_DECRYPT, $this->iv );
		$str = $this->pkcs5Unpad( $str );
		return $str;
	}

	function hex2bin($hexData) {
		$binData = "";
		for($i = 0; $i < strlen ( $hexData ); $i += 2) {
			$binData .= chr ( hexdec ( substr ( $hexData, $i, 2 ) ) );
		}
		return $binData;
	}

	function pkcs5Pad($text, $blocksize) {
		$pad = $blocksize - (strlen ( $text ) % $blocksize);
		return $text . str_repeat ( chr ( $pad ), $pad );
	}

	function pkcs5Unpad($text) {
		$pad = ord ( $text {strlen ( $text ) - 1} );
		if ($pad > strlen ( $text ))
			return false;
		if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)
			return false;
		return substr ( $text, 0, - 1 * $pad );
	}

}
?>

测试：

$str = '12345678';

$key = '1234abcd';
$crypt = new DES($key);
$mstr = $crypt->encrypt($str);
$str = $crypt->decrypt($mstr);

echo  $str.' <=> '.$mstr;