tc_aes_encrypt.c File Reference

#include "tc_aes.h"
#include "tc_utils.h"
#include "tc_constants.h"

Macros
#define	subbyte(a, o)   (sbox[((a) >> (o))&0xff] << (o))
#define	subword(a)   (subbyte(a, 24)|subbyte(a, 16)|subbyte(a, 8)|subbyte(a, 0))
#define	triple(a)   (_double_byte(a)^(a))

Functions
static unsigned int	rotword (unsigned int a)
int	tc_aes128_set_encrypt_key (TCAesKeySched_t s, const uint8_t *k)
	Set AES-128 encryption key Uses key k to initialize s. More...
static void	add_round_key (uint8_t *s, const unsigned int *k)
static void	sub_bytes (uint8_t *s)
static void	mult_row_column (uint8_t *out, const uint8_t *in)
static void	mix_columns (uint8_t *s)
static void	shift_rows (uint8_t *s)
int	tc_aes_encrypt (uint8_t *out, const uint8_t *in, const TCAesKeySched_t s)
	AES-128 Encryption procedure Encrypts contents of in buffer into out buffer under key; schedule s. More...

Variables
static const uint8_t	sbox [256]

Macro Definition Documentation

subbyte

#define subbyte	(		a,
			o
	)		(sbox[((a) >> (o))&0xff] << (o))

subword

#define subword

(

a

)

(subbyte(a, 24)|subbyte(a, 16)|subbyte(a, 8)|subbyte(a, 0))

triple

#define triple

(

a

)

(_double_byte(a)^(a))

Function Documentation

add_round_key()

static void add_round_key ( uint8_t *  s, const unsigned int *  k  )

inlinestatic

mix_columns()

static void mix_columns ( uint8_t *  s )

inlinestatic

mult_row_column()

static void mult_row_column ( uint8_t *  out, const uint8_t *  in  )

inlinestatic

rotword()

static unsigned int rotword ( unsigned int  a )

inlinestatic

shift_rows()

static void shift_rows ( uint8_t *  s )

inlinestatic

sub_bytes()

static void sub_bytes ( uint8_t *  s )

inlinestatic

tc_aes128_set_encrypt_key()

int tc_aes128_set_encrypt_key	(	TCAesKeySched_t	s,
		const uint8_t *	k
	)

Set AES-128 encryption key Uses key k to initialize s.

Returns

returns TC_CRYPTO_SUCCESS (1) returns TC_CRYPTO_FAIL (0) if: s == NULL or k == NULL

Note

This implementation skips the additional steps required for keys larger than 128 bits, and must not be used for AES-192 or AES-256 key schedule – see FIPS 197 for details

Parameters

s	IN/OUT – initialized struct tc_aes_key_sched_struct
k	IN – points to the AES key

tc_aes_encrypt()

int tc_aes_encrypt	(	uint8_t *	out,
		const uint8_t *	in,
		const TCAesKeySched_t	s
	)

AES-128 Encryption procedure Encrypts contents of in buffer into out buffer under key; schedule s.

Note

Assumes s was initialized by aes_set_encrypt_key; out and in point to 16 byte buffers

Returns

returns TC_CRYPTO_SUCCESS (1) returns TC_CRYPTO_FAIL (0) if: out == NULL or in == NULL or s == NULL

Parameters

out	IN/OUT – buffer to receive ciphertext block
in	IN – a plaintext block to encrypt
s	IN – initialized AES key schedule

Variable Documentation

sbox

const uint8_t sbox[256]

static

Initial value:

= {
  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
}