ph值是什麼意思 TripleDES之C#和PHP之間加密解密

在C#常用加密解密一文中，介紹了幾個加密解密方法，其中有個如何使用對稱加密演算法DES，此次說下DES的升級版，TripleDES。

DES和TripleDES之間的關係可以參考下面的部落格文章。
對稱加密DES和TripleDES

重點內容是，如何分別在C#，PHP中使用TripleDES，然後可以讓二者可以解密對方發送的加密內容。

廢話不多說，直接上兩端的程式碼。

C#代碼

<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></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></summary></span></span><span><span>///</span><span><param name="key"></span>原始key值<span></param></span></span><span><span>///</span><span><returns></span><span></returns></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></span></span><span><span>///</span> TripleDES 加密</span><span><span>///</span><span></summary></span></span><span><span>///</span><span><param name="toEncrypt"></span><span></param></span></span><span><span>///</span><span><param name="privateKey"></span><span></param></span></span><span><span>///</span><span><returns></span><span></returns></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></span></span><span><span>///</span> TripleDES解密</span><span><span>///</span><span></summary></span></span><span><span>///</span><span><param name="toDecrypt"></span><span></param></span></span><span><span>///</span><span><param name="privateKey"></span><span></param></span></span><span><span>///</span><span><returns></span><span></returns></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代碼

<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: $encryptStr</br>"</span>;
 <span>$decryptStr</span> = DesDecrypt(<span>$encryptStr</span>);
    <span>echo</span><span>"decrypted string: $decryptStr"</span>;
<span>?></span></span></code>

這樣以來，PHP就可以解密C#加密後的內容，同樣C#也可以解密PHP加密後的內容。

雖然都是TripleDES加密演算法，但因為C#，PHP兩種語言加密使用的預設mode，padding都不一樣，如果直接使用各自語言自帶的TripleDES，會導致雙方使用相同的金鑰，加密同樣的內容後，加密結果不一樣，進而不能互相解密了。

關於各種語言使用的加密模式等內容，可以多多Google。就像RSA加密演算法，C#，JAVA，PHP三者使用的金鑰格式都不一樣，JAVA慣用ASN，C#慣用XML，而PHP慣用PEM。這樣就導致各自不能互通。
p.s.還沒研究出三者RSA互通的方法。

參考文章：

加密演算法模式填充

PHP padding PKCS7

How to add/remove PKCS7 padding from stran AES encrypan string

Triple DES with PCSK7 and ECB between PHP and .NET

今天父親節，祝老爸節日快樂！

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