hash
//This is a des, 3des, aes and gost encryption program i wrote using php for my assignment
<?php
if (isset($_REQUEST['select'])) {
$choice = $_POST['select'];
$mykey = $_POST['mykey'];
$msg = $_POST['plain'];
} else {
die("algorithm not selected");
}
if ($msg == ''){
die("Please enter a text to encrypt! ");
}
if ($mykey == ''){
die("Please enter a key! ");
}
function algorithmdetails($cipher)
{
$chiphername = mcrypt_enc_get_algorithms_name($cipher);
$blocksize = mcrypt_enc_get_block_size($cipher);
$mykeysize = mcrypt_enc_get_supported_key_sizes($cipher);
echo "<p><b>Cipher Name :</b> $chiphername";
echo "<p><b>Block size :</b> $blocksize bytes";
echo "<p><b>Key size :</b> ";
foreach ($mykeysize as $value)
{
echo "$value bytes ";
}unset($value);
}
function encryptnow($thecipher, $thekey, $themsg)
{
$iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($thecipher), MCRYPT_DEV_RANDOM);
mcrypt_generic_init($thecipher, $thekey, $iv);
$encrypted_text = mcrypt_generic($thecipher, $themsg);
echo "<html><hr size='2' ></html>";
echo "<P><P><b>Plain Text : </b>";
echo($themsg);
echo "<p><b>Cipher Text : </b> ";
echo "$encrypted_text";
mcrypt_generic_deinit($thecipher);
mcrypt_module_close($thecipher);
die();
}
if ($choice == '1'){
$cipher = mcrypt_module_open (MCRYPT_DES, '', 'ecb', '');
algorithmdetails($cipher);
encryptnow($cipher, $mykey, $msg);
}elseif ($choice == '2'){
$cipher = mcrypt_module_open (MCRYPT_3DES, '', 'ecb', '');
algorithmdetails($cipher);
encryptnow($cipher, $mykey, $msg);
}elseif ($choice == '3'){
$cipher = mcrypt_module_open (MCRYPT_RIJNDAEL_128, '', 'ecb', '');
algorithmdetails($cipher);
encryptnow($cipher, $mykey, $msg);
}elseif ($choice == '4'){
$cipher = mcrypt_module_open (MCRYPT_GOST, '', 'ecb', '');
algorithmdetails($cipher);
encryptnow($cipher, $mykey, $msg);
}else {
die("Please choose an algorithm!");
}
?>
Mcrypt
- Introduction
- Installing/Configuring
- Predefined Constants
- Mcrypt ciphers
- Examples
- Mcrypt Functions
- mcrypt_cbc — Encrypts/decrypts data in CBC mode
- mcrypt_cfb — Encrypts/decrypts data in CFB mode
- mcrypt_create_iv — Creates an initialization vector (IV) from a random source
- mcrypt_decrypt — Decrypts crypttext with given parameters
- mcrypt_ecb — Deprecated: Encrypts/decrypts data in ECB mode
- mcrypt_enc_get_algorithms_name — Returns the name of the opened algorithm
- mcrypt_enc_get_block_size — Returns the blocksize of the opened algorithm
- mcrypt_enc_get_iv_size — Returns the size of the IV of the opened algorithm
- mcrypt_enc_get_key_size — Returns the maximum supported keysize of the opened mode
- mcrypt_enc_get_modes_name — Returns the name of the opened mode
- mcrypt_enc_get_supported_key_sizes — Returns an array with the supported keysizes of the opened algorithm
- mcrypt_enc_is_block_algorithm_mode — Checks whether the encryption of the opened mode works on blocks
- mcrypt_enc_is_block_algorithm — Checks whether the algorithm of the opened mode is a block algorithm
- mcrypt_enc_is_block_mode — Checks whether the opened mode outputs blocks
- mcrypt_enc_self_test — Runs a self test on the opened module
- mcrypt_encrypt — Encrypts plaintext with given parameters
- mcrypt_generic_deinit — This function deinitializes an encryption module
- mcrypt_generic_end — This function terminates encryption
- mcrypt_generic_init — This function initializes all buffers needed for encryption
- mcrypt_generic — This function encrypts data
- mcrypt_get_block_size — Gets the block size of the specified cipher
- mcrypt_get_cipher_name — Gets the name of the specified cipher
- mcrypt_get_iv_size — Returns the size of the IV belonging to a specific cipher/mode combination
- mcrypt_get_key_size — Gets the key size of the specified cipher
- mcrypt_list_algorithms — Gets an array of all supported ciphers
- mcrypt_list_modes — Gets an array of all supported modes
- mcrypt_module_close — Closes the mcrypt module
- mcrypt_module_get_algo_block_size — Returns the blocksize of the specified algorithm
- mcrypt_module_get_algo_key_size — Returns the maximum supported keysize of the opened mode
- mcrypt_module_get_supported_key_sizes — Returns an array with the supported keysizes of the opened algorithm
- mcrypt_module_is_block_algorithm_mode — Returns if the specified module is a block algorithm or not
- mcrypt_module_is_block_algorithm — This function checks whether the specified algorithm is a block algorithm
- mcrypt_module_is_block_mode — Returns if the specified mode outputs blocks or not
- mcrypt_module_open — Opens the module of the algorithm and the mode to be used
- mcrypt_module_self_test — This function runs a self test on the specified module
- mcrypt_ofb — Encrypts/decrypts data in OFB mode
- mdecrypt_generic — Decrypts data
add a note
User Contributed Notes
Mcrypt
ysfbauchi at yahoo dot com
20-Feb-2011 12:25
ghoffman at salientdigital dot com
23-Nov-2010 03:23
If you want a quick way to see what ciphers, modes, key, block and iv sizes are supported on your server, try something like the following.
Note: I used this simple bash: `locate libmcrypt` from terminal on Mac OS X to determine the install paths to the algorithms and modes directories. Lots of function calls generate warnings for certain ciphers, hence the use of error suppression.
<?php
$modes = mcrypt_list_modes();
$algorithms = mcrypt_list_algorithms();
foreach($algorithms as $cipher)
{
echo "<h1 style=\"border-top:1px solid black;\">".$cipher."</h1>\n";
foreach($modes as $mode)
{
echo "<h3>".$mode."</h3>\n";
@$td = mcrypt_module_open(
$cipher,
'/usr/local/libmcrypt-2.5.8/modules/algorithms/',
$mode,
'/usr/local/libmcrypt-2.5.8/modules/modes/');
@$key_size = mcrypt_enc_get_key_size($td);
@$block_size = mcrypt_get_block_size($cipher,$mode);
@$iv_size = mcrypt_get_iv_size($cipher, $mode);
@mcrypt_module_close($td);
echo "
<pre>
key_size: ". ($key_size?$key_size:'n/a')
." block_size: ". ($block_size?$block_size:'n/a')
." iv_size: ". ($iv_size?$iv_size:'n/a')
." </pre>\n";
$td=NULL;
$key_size=NULL;
$block_size=NULL;
$iv_size=NULL;
}
}
?>
rainbowarrior
28-Aug-2010 11:25
for Suse Linux Enterprise 11 I had used this to resolve the issue (as root)
# yast -i php5-mcrypt
# rcapache2 restart
hope this helps
Maarten Malaise
11-Apr-2010 08:38
people using phpmyadmin are redirected to this manual if they don't have mcrypt installed. If you want to install mcrypt on debian, first check your php version:
yourserver# php --version
Then install the appropriate version of mcrypt (php5-mcrypt if your php version is 5.x)
yourserver# apt-get install php4-mcrypt
...or...
yourserver# apt-get install php5-mcrypt
Anonymous
15-Oct-2009 11:11
When using 3DES between PHP and C#, it is to be noted that there are subtle differences that if not strictly observed, will result in annoying problem encrypt/decrypt data.
1), When using a 16 bytes key, php and c# generates total different outcome string. it seems that a 24 bytes key is required for php and c# to work alike.
2), php doesnt have a "padding" option, while c# has 3 (?). My work around is to add nulls i.e. chr(0) to the end of the source string to make its size times of 8, while in c#, PaddingMode.Zeros is required.
3) the key size has to be times of 8, in php, to make it work for c#.