Crypt_AES

# Procedural File: AES.php

Source Location: /lib/3rdParty/phpseclib/Crypt/AES.php

## Classes:

Crypt_AES
  Pure-PHP implementation of AES.

## Page Details:

Pure-PHP implementation of AES.

Uses mcrypt, if available, and an internal implementation, otherwise.

PHP versions 4 and 5

If Crypt_AES::setKeyLength() isn't called, it'll be calculated from Crypt_AES::setKey(). ie. if the key is 128-bits, the key length will be 128-bits. If it's 136-bits it'll be null-padded to 160-bits and 160 bits will be the key length until setKey() is called, again, at which point, it'll be recalculated.

Since Crypt_AES extends Crypt_Rijndael, some functions are available to be called that, in the context of AES, don't make a whole lot of sense. setBlockLength(), for instance. Calling that function, however possible, won't do anything (AES has a fixed block length whereas Rijndael has a variable one).

Here's a short example of how to use this library:

1. <?php
2. include('Crypt/AES.php');
4. $aes = new Crypt_AES ();
6. $aes->setKey('abcdefghijklmnop');
8. $size = 10 * 1024;
9. $plaintext = '';
10. for ($i = 0; $i < $size; $i++) {
11. $plaintext.= 'a';
12. }
14. echo $aes->decrypt($aes->encrypt($plaintext));
15. ?>

LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#### Tags:

author: | Jim Wigginton <terrafrost@php.net>
version: | $Id: AES.php,v 1.2 2011/05/19 18:02:11 gruberroland Exp $
copyright: | MMVIII Jim Wigginton
link: | http://phpseclib.sourceforge.net
license: | MIT License

#### Includes:

require_once('Rijndael.php') [line 69]
Include Crypt_Rijndael

### CRYPT_AES_MODE_CBC [line 95]

`CRYPT_AES_MODE_CBC = 2`

Encrypt / decrypt using the Code Book Chaining mode.

#### Tags:

see: | Crypt_AES::decrypt()
see: | Crypt_AES::encrypt()
link: | http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
access: | public

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### CRYPT_AES_MODE_CFB [line 101]

`CRYPT_AES_MODE_CFB = 3`

Encrypt / decrypt using the Cipher Feedback mode.

#### Tags:

see: | Crypt_AES::decrypt()
see: | Crypt_AES::encrypt()
link: | http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
access: | public

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### CRYPT_AES_MODE_CTR [line 83]

`CRYPT_AES_MODE_CTR = -1`

Encrypt / decrypt using the Counter mode.

Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.

#### Tags:

see: | Crypt_AES::decrypt()
see: | Crypt_AES::encrypt()
link: | http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
access: | public

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### CRYPT_AES_MODE_ECB [line 89]

`CRYPT_AES_MODE_ECB = 1`

Encrypt / decrypt using the Electronic Code Book mode.

#### Tags:

see: | Crypt_AES::decrypt()
see: | Crypt_AES::encrypt()
link: | http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
access: | public

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### CRYPT_AES_MODE_OFB [line 107]

`CRYPT_AES_MODE_OFB = 4`

Encrypt / decrypt using the Cipher Feedback mode.

#### Tags:

see: | Crypt_AES::decrypt()
see: | Crypt_AES::encrypt()
link: | http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
access: | public

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Documentation generated on Tue, 22 Nov 2011 16:29:27 +0100 by phpDocumentor 1.4.1