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POCan't locate the difference between my C# encryption function, and my PHP encryption function
 

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  1. POCan't locate the difference between my C# encryption function, and my PHP encryption function
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    <p>I wrote (what I thought to be) identical encryption functions in PHP and C#. However, encrypting the same string is not producing identical results. I'm no expert in either C# nor PHP so I was hoping someone might be able to spot the difference that for some reason I am not catching here.</p> <p><strong>PHP function:</strong></p> <pre><code>function encrypt($string, $key) { $result = NULL; for($i=0; $i&lt;strlen($string); $i++) { $char = substr($string, $i, 1); $keychar = substr($key, ($i % strlen($key))-1, 1); $char = chr(ord($char)+ord($keychar)); $result.=$char; } //return $result; return $result; } </code></pre> <p><strong>C# function:</strong></p> <pre><code> public static string encrypt_php_data(string stringToEncrypt, string key) { var result = string.Empty; for (int i = 0; i &lt; stringToEncrypt.Length; i++) { string keychar = phpSubStr_replacement(key, (i % key.Length) - 1); result += (char)(Convert.ToChar(stringToEncrypt.Substring(i, 1)) + Convert.ToChar(keychar)); } return result; } private static string phpSubStr_replacement(string stringToGrab, int startIndex) { if (startIndex &lt; 0) { // Take from end of string return stringToGrab.Substring(stringToGrab.Length + startIndex, 1); } else { // Take from beginning of string return stringToGrab.Substring(startIndex, 1); } } </code></pre> <p>Here are the results of encrypting identical strings:</p> <p>String encrypted: 09/16/2011 15:27:45</p> <p>password used: somekey</p> <pre><code>C# Result: ©¬©¤  «ª©¡ PHP Result: ©¬žž›š—©¤ – Ÿ«ª©¡š </code></pre> <h3>Note:</h3> <p>Not all outputs vary from each other. I cannot understand why some are different, while others produce the same outcome, makes no sense.</p> <p>I look forward to your responses,</p> <p>Evan</p>
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      1. POCan't locate the difference between my C# encryption function, and my PHP encryption function
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      1. POCan't locate the difference between my C# encryption function, and my PHP encryption function
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      1. POCan't locate the difference between my C# encryption function, and my PHP encryption function
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    1. COare these on the same system? The PHP version looks like the C# version but with extra characters.
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      1. POCan't locate the difference between my C# encryption function, and my PHP encryption function
      1. USChris Cummings
    2. COHave you looked at the encoding of the strings?
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      1. POCan't locate the difference between my C# encryption function, and my PHP encryption function
      1. USThilak Nathen
    3. COCould you explain a bit further? I have not ...
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