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Scripts: PHP :: PHP security and encryption >> Library Article #4

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Encrypt a string in PHP
By: Erobo Team Member

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Learn a simple way to encrypt a string using php.

In this article you will learn how to encrypt a string in php. The following algorithm uses the xor operator to encrypt every character in a string. Finally, It decrypts the encrypted string by taking the encrypted string and xor it with the bytes characters the other way around.

	Code Snippet 1

    function encryptDecrypt($Str_Message)
    {

    $Len_Str_Message=STRLEN($Str_Message);
    $Str_Encrypted_Message="";
    FOR ($Position = 0;$Position<$Len_Str_Message;$Position++){
        $Key_To_Use = (($Len_Str_Message+$Position)+1);
        $Key_To_Use = (255+$Key_To_Use) % 255;
        $Byte_To_Be_Encrypted = SUBSTR($Str_Message, $Position, 1);
        $Ascii_Num_Byte_To_Encrypt = ORD($Byte_To_Be_Encrypted);
        //uses xor operator
        $Xored_Byte = $Ascii_Num_Byte_To_Encrypt ^ $Key_To_Use;
        $Encrypted_Byte = CHR($Xored_Byte);
        $Str_Encrypted_Message .= $Encrypted_Byte;

    }


    return $Str_Encrypted_Message;

    }

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