Blowfish.NET的简单封装

作者：caocao（网络隐士），http://www.caocao.name，http://www.caocao.mobi
转载请注明来源：http://caocao.iteye.com/blog/96902

隐士为了在asp.net环境里应用Blowfish加密技术实现单点登录，对Blowfish.NET进行了简单的封装。要下载Blowfish.NET包可自行Google之。

闲话不多说，上代码：

c# 代码

public string Decrypt(string inString,string keyString)
{
    UTF8Encoding ue = new UTF8Encoding();
    byte[] key=ue.GetBytes(keyString);
    byte[] inBuffer=ue.GetBytes(inString);
    BlowfishECB ecb=new BlowfishECB(key, 0, key.Length);
    try
    {
        inBuffer=Convert.FromBase64String(inString);
        if (inBuffer.Length % BlowfishECB.BLOCK_SIZE != 0)
        {
            return null;
        }
    }
    catch (FormatException)
    {
        return null;
    }

    byte[] outBuffer = new byte[inBuffer.Length];
    Array.Clear(outBuffer, 0, outBuffer.Length);
    ecb.Decrypt(inBuffer,
        0,
        outBuffer,
        0,
        inBuffer.Length);
    return ue.GetString(outBuffer, 0, outBuffer.Length);
}

public string Encrypt(string inString,string keyString)
{
    UTF8Encoding ue = new UTF8Encoding();
    byte[] key=ue.GetBytes(keyString);
    byte[] inStringBytes=ue.GetBytes(inString);
    int length=inStringBytes.Length;
    length=Convert.ToInt32(Math.Ceiling(1.0*length/BlowfishECB.BLOCK_SIZE))*BlowfishECB.BLOCK_SIZE;

    byte[] inBuffer = new byte[length];
    byte[] outBuffer = new byte[length];
    Array.Clear(inBuffer, 0, inBuffer.Length);
    Array.Clear(outBuffer, 0, outBuffer.Length);
    Array.Copy(inStringBytes, inBuffer, inStringBytes.Length);

    BlowfishECB ecb=new BlowfishECB(key, 0, key.Length);
    int nCount=ecb.Encrypt(inBuffer,
        0,
        outBuffer,
        0,
        inBuffer.Length);
    return Convert.ToBase64String(outBuffer);
}

实现类似功能的PHP代码很简洁：

PHP 代码

$outString=base64_encode(@mcrypt_encrypt(MCRYPT_BLOWFISH, $key, $inString, MCRYPT_MODE_ECB));
$outString=@mcrypt_decrypt(MCRYPT_BLOWFISH, $key, base64_decode($inString), MCRYPT_MODE_ECB);

至此彻底打通PHP，asp.net之间Blowfish加密的任督二脉。

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