Code Examples -> A PHP function to encrypt and decrypt a number or string or a combination of the two.

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PHP Code Examples

Title :	A PHP function to encrypt and decrypt a number or string or a combination of the two.
Categories :	PHP, Encryption, Security	Anand kumar
Date :	Feb 12th 2008
Grade :	2 of 5 (graded 6 times)
Viewed :	14994
File :	No file for this code example.
Images :	No Images for this code example.

Search :	More code by Anand kumar
Action :	Grade This Code Example
Tools :	My Examples List

Code

<?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 $Str_Encrypted_Message." ";
FOR ($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 $Str_Encrypted_Message." ";
FOR ($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")." ";
echo "Decryption of a string '100abc' is :";
$a= ENCRYPT_DECRYPT("100abc")." ";
echo ENCRYPT_DECRYPT1($a)." ";
?>

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User Comments

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 ?