在C#常用加密解密一文中，介绍了几个加密解密方法，其中有个如何使用对称加密算法DES，此次说下DES的升级版，TripleDES。
DES和TripleDES之间的关系可以参考下面的博文。
对称加密DES和TripleDES
重点内容是，如何分别在C#，PHP中使用TripleDES，然后可以让二者可以解密对方发送的加密内容。
废话不多说，直接上两端的代码。
C#代码
<code><span>using</span> System;
<span>using</span> System.Security.Cryptography;
<span>using</span> System.Text;
namespace TripleDes
{
class Program
{
<span>static</span><span>void</span> Main(<span>string</span>[] args)
{
<span>//加密的字符串</span><span>string</span> source = <span>"Happy Father's Day!"</span>;
<span>//用来加密的key 但是最终用在des加密的key</span><span>//是这个key的 md5 hash</span><span>string</span> sourceKey = <span>"home"</span>;
<span>//获取原始key值的 md5 hash</span><span>byte</span>[] keyBytes = GetKeyMd5Hash(sourceKey);
<span>string</span> encryptedStr = DesEncrypt(source, keyBytes);
Console.WriteLine(<span>"encrypted string: "</span>+ encryptedStr);
<span>string</span> decryptedStr = DesDecrypt(encryptedStr, keyBytes);
Console.WriteLine(<span>"Decrypted String: "</span> + decryptedStr);
Console.ReadKey();
}
<span><span>///</span><span><summary></summary></span></span><span><span>///</span> 获取加密key的 md5 hash，最终DES加密的时候使用这个hash值</span><span><span>///</span><span></span></span><span><span>///</span><span><param name="key"></span>原始key值<span></span></span><span><span>///</span><span><returns></returns></span><span></span></span><span>public</span><span>static</span><span>byte</span>[] <span>GetKeyMd5Hash</span>(<span>string</span> key)
{
MD5CryptoServiceProvider hashmd5 = <span>new</span> MD5CryptoServiceProvider();
<span>byte</span>[] keyBytes = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
hashmd5.Clear();
<span>return</span> keyBytes;
}
<span><span>///</span><span><summary></summary></span></span><span><span>///</span> TripleDES 加密</span><span><span>///</span><span></span></span><span><span>///</span><span><param name="toEncrypt"></span><span></span></span><span><span>///</span><span><param name="privateKey"></span><span></span></span><span><span>///</span><span><returns></returns></span><span></span></span><span>public</span><span>static</span><span>string</span><span>DesEncrypt</span>(<span>string</span> toEncrypt, <span>byte</span>[] privateKey)
{
<span>byte</span>[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);
TripleDESCryptoServiceProvider tdes = <span>new</span> TripleDESCryptoServiceProvider
{
Key = privateKey,
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7
};
ICryptoTransform cTransform = tdes.CreateEncryptor();
<span>byte</span>[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, <span>0</span>, toEncryptArray.Length);
tdes.Clear();
<span>return</span> Convert.ToBase64String(resultArray, <span>0</span>, resultArray.Length);
}
<span><span>///</span><span><summary></summary></span></span><span><span>///</span> TripleDES解密</span><span><span>///</span><span></span></span><span><span>///</span><span><param name="toDecrypt"></span><span></span></span><span><span>///</span><span><param name="privateKey"></span><span></span></span><span><span>///</span><span><returns></returns></span><span></span></span><span>public</span><span>static</span><span>string</span><span>DesDecrypt</span>(<span>string</span> toDecrypt, <span>byte</span>[] privateKey)
{
<span>//先base64解密 因为加密的时候最后走了一道base64加密</span><span>byte</span>[] enBytes = Convert.FromBase64String(toDecrypt);
TripleDESCryptoServiceProvider tdes = <span>new</span> TripleDESCryptoServiceProvider
{
Key = privateKey,
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7
};
ICryptoTransform cTransform = tdes.CreateDecryptor();
<span>byte</span>[] resultArray = cTransform.TransformFinalBlock(enBytes, <span>0</span>, enBytes.Length);
tdes.Clear();
<span>return</span> Encoding.UTF8.GetString(resultArray);
}
}
}
</code>PHP代码
<code><span><span><?php </span><span>/*
TripleDES加密
*/</span><span><span>function</span><span>DesEncrypt</span><span>(<span>$data</span>)</span>
{</span><span>//Pad for PKCS7</span><span>$blockSize</span> = mcrypt_get_block_size(<span>'tripledes'</span>, <span>'ecb'</span>);
<span>$len</span> = strlen(<span>$data</span>);
<span>$pad</span> = <span>$blockSize</span> - (<span>$len</span> % <span>$blockSize</span>);
<span>$data</span> .= str_repeat(chr(<span>$pad</span>), <span>$pad</span>);
<span>$key</span> = <span>"home"</span>;
<span>$key</span> = md5(<span>$key</span>,<span>TRUE</span>);
<span>$key</span> .= substr(<span>$key</span>,<span>0</span>,<span>8</span>); <span>//comment this if you use 168 bits long key</span><span>//Encrypt data</span><span>$encData</span> = mcrypt_encrypt(<span>'tripledes'</span>, <span>$key</span>, <span>$data</span>, <span>'ecb'</span>);
<span>return</span> base64_encode(<span>$encData</span>);
}
<span>/*
TripleDES解密
*/</span><span><span>function</span><span>DesDecrypt</span><span>(<span>$data</span>)</span>
{</span><span>$key</span> = <span>"home"</span>;
<span>$key</span> = md5(<span>$key</span>, <span>TRUE</span>);
<span>$key</span> .= substr(<span>$key</span>, <span>0</span>, <span>8</span>);
<span>//Decrypt data</span><span>$fromBase64Str</span> = base64_decode(<span>$data</span>);
<span>$decData</span> = mcrypt_decrypt(<span>'tripledes'</span>, <span>$key</span>, <span>$fromBase64Str</span>, <span>'ecb'</span>);
<span>return</span><span>$decData</span>;
}
<span>/*
测试
*/</span><span>$encryptStr</span> = DesEncrypt(<span>"Happy Father's Day!"</span>);
<span>echo</span><span>"encrypted string: $encryptStr"</span>;
<span>$decryptStr</span> = DesDecrypt(<span>$encryptStr</span>);
<span>echo</span><span>"decrypted string: $decryptStr"</span>;
<span>?></span></span></span></code>这样以来，PHP就可以解密C#加密后的内容，同样C#也可以解密PHP加密后的内容。
虽然都是TripleDES加密算法，但是因为C#，PHP两种语言加密使用的默认mode，padding都不一样，如果直接使用各自语言自带的TripleDES，会导致双方使用同样的密钥，加密同样的内容后，加密结果不一样，进而就不能相互解密了。
关于各种语言使用的加密模式等内容，可以多多Google。就像RSA加密算法，C#，JAVA，PHP三者使用的密钥格式都不一样，JAVA惯用ASN，C#惯用XML，而PHP惯用PEM。这样就导致各自不能互通。
p.s.还没研究出三者RSA互通的方法。
参考文章：
加密算法模式 填充
PHP padding PKCS7
How to add/remove PKCS7 padding from an AES encrypted string
Triple DES with PCSK7 and ECB between PHP and .NET
今天父亲节，祝老爸节日快乐！
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