<?php
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class DES_NET{
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var $key;
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var $iv; //偏移量
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function DES_NET( $key, $iv=0 ) {
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//key长度8例如:1234abcd
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$this->key = $key;
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if( $iv == 0 ) {
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$this->iv = $key; //默认以$key 作为 iv
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} else {
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$this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );
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}
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}
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function encrypt($str) {
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//加密，返回大写十六进制字符串
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$size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );
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$str = $this->pkcs5Pad ( $str, $size );
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return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) );
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}
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function decrypt($str) {
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//解密
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$strBin = $this->hex2bin( strtolower( $str ) );
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$str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, MCRYPT_DECRYPT, $this->iv );
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$str = $this->pkcs5Unpad( $str );
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return $str;
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}
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function hex2bin($hexData) {
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$binData = "";
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for($i = 0; $i < strlen ( $hexData ); $i += 2) {
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$binData .= chr ( hexdec ( substr ( $hexData, $i, 2 ) ) );
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}
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return $binData;
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}
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function pkcs5Pad($text, $blocksize) {
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$pad = $blocksize - (strlen ( $text ) % $blocksize);
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return $text . str_repeat ( chr ( $pad ), $pad );
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}
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function pkcs5Unpad($text) {
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$pad = ord ( $text {strlen ( $text ) - 1} );
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if ($pad > strlen ( $text ))
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return false;
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if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)
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return false;
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return substr ( $text, 0, - 1 * $pad );
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}
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}
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?>
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