Docs For Class AKEncryptionAES

Description

AES implementation in PHP (c) Chris Veness 2005-2011

(http://www.movable-type.co.uk/scripts/aes-php.html) I offer these formulæ & scripts for free use and adaptation as my contribution to the open-source info-sphere from which I have received so much. You are welcome to re-use these scripts [under a simple attribution license or a GPL licence, without any warranty express or implied] provided solely that you retain my copyright notice and a link to this page. licence. No warranty of any form is offered.

Modified for Akeeba Backup by Nicholas K. Dionysopoulos

Located in /administrator/components/com_joomlaupdate/restore.php (line 5014)

Variable Summary

static mixed $passwords

static mixed $Rcon

static mixed $Sbox

Method Summary

static void AddRoundKey ( $state, $w, $rnd, $Nb)

static string AESDecryptCBC (string $ciphertext, string $password, [int $nBits = 128])

static decrypted AESDecryptCtr (ciphertext $ciphertext, password $password, nBits $nBits)

static encrypted AESEncryptCtr (plaintext $plaintext, password $password, nBits $nBits)

static ciphertext Cipher (input $input, w $w)

static key KeyExpansion (key $key)

static void MixColumns ( $s, $Nb)

static void RotWord ( $w)

static void ShiftRows ( $s, $Nb)

static void SubBytes ( $s, $Nb)

static void SubWord ( $w)

static void urs ( $a, $b)

Variables

static mixed $passwords = array() (line 5049)

access: protected

static mixed $Rcon = array(
array(0x00, 0x00, 0x00, 0x00),array(0x01,0x00,0x00,0x00),array(0x02,0x00,0x00,0x00),array(0x04,0x00,0x00,0x00),array(0x08,0x00,0x00,0x00),array(0x10,0x00,0x00,0x00),array(0x20,0x00,0x00,0x00),array(0x40,0x00,0x00,0x00),array(0x80,0x00,0x00,0x00),array(0x1b,0x00,0x00,0x00),array(0x36,0x00,0x00,0x00)) (line 5036)

access: protected

static mixed $Sbox = array(0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,
0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,
0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,
0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,
0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,
0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,
0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,
0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,
0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,
0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,
0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,
0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,
0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,
0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,
0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,
0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16) (line 5017)

access: protected

Methods

static AddRoundKey (line 5084)

access: protected

static void AddRoundKey ( $state, $w, $rnd, $Nb)

$state
$w
$rnd
$Nb

static AESDecryptCBC (line 5332)

AES decryption in CBC mode. This is the standard mode (the CTR methods actually use Rijndael-128 in CTR mode, which - technically - isn't AES).

Supports AES-128, AES-192 and AES-256. It supposes that the last 4 bytes contained a little-endian unsigned long integer representing the unpadded data length.

return: The plaintext
author: Nicholas K. Dionysopoulos
since: 3.0.1
access: public

static string AESDecryptCBC (string $ciphertext, string $password, [int $nBits = 128])

string $ciphertext: The data to encrypt
string $password: Encryption password
int $nBits: Encryption key size. Can be 128, 192 or 256

static AESDecryptCtr (line 5264)

Decrypt a text encrypted by AES in counter mode of operation

return: text
access: public

static decrypted AESDecryptCtr (ciphertext $ciphertext, password $password, nBits $nBits)

ciphertext $ciphertext: source text to be decrypted
password $password: the password to use to generate a key
nBits $nBits: number of bits to be used in the key (128, 192, or 256)

static AESEncryptCtr (line 5199)

Encrypt a text using AES encryption in Counter mode of operation

see http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf

Unicode multi-byte character safe

return: text
access: public

static encrypted AESEncryptCtr (plaintext $plaintext, password $password, nBits $nBits)

plaintext $plaintext: source text to be encrypted
password $password: the password to use to generate a key
nBits $nBits: number of bits to be used in the key (128, 192, or 256)

static Cipher (line 5059)

AES Cipher function: encrypt 'input' with Rijndael algorithm

return: as byte-array (16 bytes)
access: protected

static ciphertext Cipher (input $input, w $w)

input $input: message as byte-array (16 bytes)
w $w: key schedule as 2D byte-array (Nr+1 x Nb bytes) - generated from the cipher key by KeyExpansion()

static KeyExpansion (line 5131)

Key expansion for Rijndael Cipher(): performs key expansion on cipher key to generate a key schedule

return: schedule as 2D byte-array (Nr+1 x Nb bytes)
access: protected

static key KeyExpansion (key $key)

key $key: cipher key byte-array (16 bytes)

static MixColumns (line 5107)

access: protected

static void MixColumns ( $s, $Nb)

$s
$Nb

static RotWord (line 5163)

access: protected

static void RotWord ( $w)

$w

static ShiftRows (line 5098)

access: protected

static void ShiftRows ( $s, $Nb)

$s
$Nb

static SubBytes (line 5091)

access: protected

static void SubBytes ( $s, $Nb)

$s
$Nb

static SubWord (line 5158)

access: protected

static void SubWord ( $w)

$w

static urs (line 5177)

access: protected

static void urs ( $a, $b)

$a
$b