Zabbix

/*

 *

 * This is an implementation of the AES algorithm, specifically ECB, CTR and CBC mode.

 * Block size can be chosen in aes.h - available choices are AES128, AES192, AES256.

 *

 * The implementation is verified against the test vectors in:

 * National Institute of Standards and Technology Special Publication 800-38A 2001 ED

 *

 * ECB-AES128

 * ----------

 *

 * plain-text:

 * 6bc1bee22e409f96e93d7e117393172a

 * ae2d8a571e03ac9c9eb76fac45af8e51

 * 30c81c46a35ce411e5fbc1191a0a52ef

 * f69f2445df4f9b17ad2b417be66c3710

 *

 * key:

 * 2b7e151628aed2a6abf7158809cf4f3c

 *

 * resulting cipher

 * 3ad77bb40d7a3660a89ecaf32466ef97

 * f5d3d58503b9699de785895a96fdbaaf

 * 43b1cd7f598ece23881b00e3ed030688

 * 7b0c785e27e8ad3f8223207104725dd4

 *

 *

 * NOTE:   String length must be evenly divisible by 16byte (str_len % 16 == 0)

 * You should pad the end of the string with zeros if this is not the case.

 * For AES192/256 the key size is proportionally larger.

 *

 */

​

/*****************************************************************************/

/* Includes:                                                                 */

/*****************************************************************************/

#include "aes.h"

​

#include <string.h> // CBC mode, for memset

​

/*****************************************************************************/

/* Defines:                                                                  */

/*****************************************************************************/

// The number of columns comprising a state in AES. This is a constant in AES. Value=4

#define Nb 4

​

#if defined(AES256) && (AES256 == 1)

#   define Nk 8

#   define Nr 14

#elif defined(AES192) && (AES192 == 1)

#   define Nk 6

#   define Nr 12

#else

#   define Nk 4        // The number of 32 bit words in a key.

#   define Nr 10       // The number of rounds in AES Cipher.

#endif

​

// jcallan@github points out that declaring Multiply as a function

// reduces code size considerably with the Keil ARM compiler.

// See this link for more information: https://github.com/kokke/tiny-AES-C/pull/3

#ifndef MULTIPLY_AS_A_FUNCTION

#   define MULTIPLY_AS_A_FUNCTION 0

#endif

​

/*****************************************************************************/

/* Private variables:                                                        */

/*****************************************************************************/

// state - array holding the intermediate results during decryption.

typedef uint8_t state_t[4][4];

​

// The lookup-tables are marked const so they can be placed in read-only storage instead of RAM

// The numbers below can be computed dynamically trading ROM for RAM -

// This can be useful in (embedded) bootloader applications, where ROM is often limited.

static const uint8_t sbox[256] =

{

    //0     1    2      3     4    5     6     7      8    9     A      B    C     D     E     F

    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,