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<?php
//Function : encrypt/decrypt a string message
//Author : Anand sharma
FUNCTION ENCRYPT_DECRYPT($Str_Message) {
$Len_Str_Message=STRLEN($Str_Message);
$Str_Encrypted_Message="";
echo $Str_Encrypted_Message."<br/>";
FOR ($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);
$Xored_Byte = $Ascii_Num_Byte_To_Encrypt ^ $Key_To_Use;
$Encrypted_Byte = CHR($Xored_Byte);
$Str_Encrypted_Message .= $Encrypted_Byte;
}
RETURN $Str_Encrypted_Message;
}
FUNCTION ENCRYPT_DECRYPT1($Str_Message) {
$Len_Str_Message=STRLEN($Str_Message);
$Str_Encrypted_Message="";
echo $Str_Encrypted_Message."<br/>";
FOR ($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);
$Xored_Byte = $Ascii_Num_Byte_To_Encrypt ^ $Key_To_Use;
$Encrypted_Byte = CHR($Xored_Byte);
$Str_Encrypted_Message .= $Encrypted_Byte;
}
RETURN $Str_Encrypted_Message;
}
?> | |
Example Usage
| <?php
echo "Encryption of a string '100abc' is :";
echo ENCRYPT_DECRYPT("100abc")."<br/>";
echo "Decryption of a string '100abc' is :";
$a= ENCRYPT_DECRYPT("100abc")."<br/>";
echo ENCRYPT_DECRYPT1($a)."<br/><br/>";
?> | |
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| | | | aitor solozabal wrote :1755
This is the same code from:
PHP Function to Encrypt/Decrypt a string without a known key. The string itself has his own different key for every character.
But is not mentioned. Why ?
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