加密流程

我们使用DES CBC加密方案。下方展示出PHP及ASP.Net的加密及解密代码。

ASP.Net版本

protected byte[] EncryptKey = ASCIIEncoding.ASCII.GetBytes("ask_us_for_key");
public string DESEncrypt(string inString)
{
    MemoryStream ms = new MemoryStream();
    CryptoStream cs = new CryptoStream(ms, new DESCryptoServiceProvider().CreateEncryptor(EncryptKey, EncryptKey), CryptoStreamMode.Write);
    StreamWriter sw = new StreamWriter(cs);
    sw.Write(inString);
    sw.Flush();
    cs.FlushFinalBlock();
    sw.Flush();
    return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
}
public string DESDecrypt(string inString)
{
    try
    {
        return new StreamReader(new CryptoStream(new MemoryStream( Convert.FromBase64String(inString)), new DESCryptoServiceProvider().CreateDecryptor(EncryptKey, EncryptKey), CryptoStreamMode.Read)).ReadToEnd();
    }
    catch
    {
    }
    return "";
}

protected byte[] EncryptKey = ASCIIEncoding.ASCII.GetBytes("ask_us_for_key");

public string DESEncrypt(string inString)

{

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, new DESCryptoServiceProvider().CreateEncryptor(EncryptKey, EncryptKey), CryptoStreamMode.Write);

StreamWriter sw = new StreamWriter(cs);

sw.Write(inString);

sw.Flush();

cs.FlushFinalBlock();

sw.Flush();

return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);

}

public string DESDecrypt(string inString)

{

try

{

return new StreamReader(new CryptoStream(new MemoryStream( Convert.FromBase64String(inString)), new DESCryptoServiceProvider().CreateDecryptor(EncryptKey, EncryptKey), CryptoStreamMode.Read)).ReadToEnd();

}

catch

{

}

return "";

}

PHP版本

<?php
class DES
{
    var $key;
    var $iv;
    function __construct( $key, $iv=0 ) {
        $this->key = $key;
        if( $iv == 0 ) {
            $this->iv = $key;
        } else {
            $this->iv = $iv;
        }
    }
    function encrypt($str) {
		return base64_encode( openssl_encrypt($str, 'DES-CBC', $this->key, OPENSSL_RAW_DATA, $this->iv  ) );
	}
    function decrypt($str) {
		$str = openssl_decrypt(base64_decode($str), 'DES-CBC', $this->key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING, $this->iv);
		return rtrim($str, "\x01..\x1F");
    }
    function pkcs5Pad($text, $blocksize) {
        $pad = $blocksize - (strlen ( $text ) % $blocksize);
        return $text . str_repeat ( chr ( $pad ), $pad );
    }
}
?>

<?php

class DES

{

var $key;

var $iv;

function __construct( $key, $iv=0 ) {

$this->key = $key;

if( $iv == 0 ) {

$this->iv = $key;

} else {

$this->iv = $iv;

}

function encrypt($str) {

return base64_encode( openssl_encrypt($str, 'DES-CBC', $this->key, OPENSSL_RAW_DATA, $this->iv ) );

}

function decrypt($str) {

$str = openssl_decrypt(base64_decode($str), 'DES-CBC', $this->key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING, $this->iv);

return rtrim($str, "\x01..\x1F");

}

function pkcs5Pad($text, $blocksize) {

$pad = $blocksize - (strlen ( $text ) % $blocksize);

return $text . str_repeat ( chr ( $pad ), $pad );

}

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