TinyAES.c File Reference

#include <stdint.h>
#include <string.h>
#include "TinyAES.h"

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Macros
#define	Nb   4
#define	BLOCKLEN   16
#define	Nk   8
#define	KEYLEN   32
#define	Nr   14
#define	keyExpSize   240
#define	MULTIPLY_AS_A_FUNCTION   0
#define	Multiply(x, y)

Typedefs
typedef uint8_t	state_t[4][4]

Functions
static uint8_t	getSBoxValue (uint8_t num)
static uint8_t	getSBoxInvert (uint8_t num)
static void	KeyExpansion (void)
static void	AddRoundKey (uint8_t round)
static void	SubBytes (void)
static void	ShiftRows (void)
static uint8_t	xtime (uint8_t x)
static void	MixColumns (void)
static void	InvMixColumns (void)
static void	InvSubBytes (void)
static void	InvShiftRows (void)
static void	Cipher (void)
static void	InvCipher (void)
void	AES_ECB_encrypt (const uint8_t *input, const uint8_t *key, uint8_t *output, const uint32_t length)
void	AES_ECB_decrypt (const uint8_t *input, const uint8_t *key, uint8_t *output, const uint32_t length)
static void	XorWithIv (uint8_t *buf)
void	AES_CBC_encrypt_buffer (uint8_t *output, uint8_t *input, uint32_t length, const uint8_t *key, const uint8_t *iv)
void	AES_CBC_decrypt_buffer (uint8_t *output, uint8_t *input, uint32_t length, const uint8_t *key, const uint8_t *iv)
void	AES_CTR_xcrypt_buffer (uint8_t *output, uint8_t *input, uint32_t length, const uint8_t *key, const uint8_t *nonce)

Variables
static state_t *	state
static uint8_t	RoundKey [keyExpSize]
static const uint8_t *	Key
static uint8_t *	Iv
static const uint8_t	sbox [256]
static const uint8_t	rsbox [256]
static const uint8_t	Rcon [11]

Macro Definition Documentation

Nb

#define Nb   4

Referenced by AddRoundKey(), and KeyExpansion().

BLOCKLEN

#define BLOCKLEN   16

Referenced by AES_CBC_decrypt_buffer(), AES_CBC_encrypt_buffer(), AES_CTR_xcrypt_buffer(), and XorWithIv().

Nk

#define Nk   8

Referenced by KeyExpansion().

KEYLEN

#define KEYLEN   32

Nr

#define Nr   14

Referenced by Cipher(), InvCipher(), and KeyExpansion().

keyExpSize

#define keyExpSize   240

MULTIPLY_AS_A_FUNCTION

#define MULTIPLY_AS_A_FUNCTION   0

Multiply

#define Multiply	(		x,
			y
	)

Value:

(  ((y & 1) * x) ^                              \
      ((y>>1 & 1) * xtime(x)) ^                       \
      ((y>>2 & 1) * xtime(xtime(x))) ^                \
      ((y>>3 & 1) * xtime(xtime(xtime(x)))) ^         \
      ((y>>4 & 1) * xtime(xtime(xtime(xtime(x))))))   \

Referenced by InvMixColumns(), and MixColumns().

Typedef Documentation

state_t

typedef uint8_t state_t[4][4]

Function Documentation

getSBoxValue()

static uint8_t getSBoxValue ( uint8_t  num )

static

References sbox.

Referenced by KeyExpansion(), and SubBytes().

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getSBoxInvert()

static uint8_t getSBoxInvert ( uint8_t  num )

static

References rsbox.

Referenced by InvSubBytes().

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KeyExpansion()

static void KeyExpansion ( void  )

static

References getSBoxValue(), Key, Nb, Nk, Nr, Rcon, and RoundKey.

Referenced by AES_CBC_decrypt_buffer(), AES_CBC_encrypt_buffer(), AES_CTR_xcrypt_buffer(), AES_ECB_decrypt(), and AES_ECB_encrypt().

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AddRoundKey()

static void AddRoundKey ( uint8_t  round )

static

References Nb, and RoundKey.

Referenced by Cipher(), and InvCipher().

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SubBytes()

static void SubBytes ( void  )

static

References getSBoxValue(), and state.

Referenced by Cipher().

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ShiftRows()

static void ShiftRows ( void  )

static

Referenced by Cipher().

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xtime()

static uint8_t xtime ( uint8_t  x )

static

Referenced by MixColumns().

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MixColumns()

static void MixColumns ( void  )

static

References Multiply, and xtime().

Referenced by Cipher().

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InvMixColumns()

static void InvMixColumns ( void  )

static

References Multiply.

Referenced by InvCipher().

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InvSubBytes()

static void InvSubBytes ( void  )

static

References getSBoxInvert(), and state.

Referenced by InvCipher().

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InvShiftRows()

static void InvShiftRows ( void  )

static

Referenced by InvCipher().

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Cipher()

static void Cipher ( void  )

static

References AddRoundKey(), MixColumns(), Nr, ShiftRows(), and SubBytes().

Referenced by AES_CBC_encrypt_buffer(), AES_CTR_xcrypt_buffer(), and AES_ECB_encrypt().

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InvCipher()

static void InvCipher ( void  )

static

References AddRoundKey(), InvMixColumns(), InvShiftRows(), InvSubBytes(), and Nr.

Referenced by AES_CBC_decrypt_buffer(), and AES_ECB_decrypt().

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AES_ECB_encrypt()

void AES_ECB_encrypt	(	const uint8_t *	input,
		const uint8_t *	key,
		uint8_t *	output,
		const uint32_t	length
	)

References Cipher(), Key, KeyExpansion(), and state.

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AES_ECB_decrypt()

void AES_ECB_decrypt	(	const uint8_t *	input,
		const uint8_t *	key,
		uint8_t *	output,
		const uint32_t	length
	)

References InvCipher(), Key, KeyExpansion(), and state.

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XorWithIv()

static void XorWithIv ( uint8_t *  buf )

static

References BLOCKLEN, and Iv.

Referenced by AES_CBC_decrypt_buffer(), and AES_CBC_encrypt_buffer().

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AES_CBC_encrypt_buffer()

void AES_CBC_encrypt_buffer	(	uint8_t *	output,
		uint8_t *	input,
		uint32_t	length,
		const uint8_t *	key,
		const uint8_t *	iv
	)

References BLOCKLEN, Cipher(), Iv, Key, KeyExpansion(), state, and XorWithIv().

Referenced by TinyAES::cbc_encrypt().

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AES_CBC_decrypt_buffer()

void AES_CBC_decrypt_buffer	(	uint8_t *	output,
		uint8_t *	input,
		uint32_t	length,
		const uint8_t *	key,
		const uint8_t *	iv
	)

References BLOCKLEN, InvCipher(), Iv, Key, KeyExpansion(), state, and XorWithIv().

Referenced by TinyAES::cbc_decrypt().

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AES_CTR_xcrypt_buffer()

void AES_CTR_xcrypt_buffer	(	uint8_t *	output,
		uint8_t *	input,
		uint32_t	length,
		const uint8_t *	key,
		const uint8_t *	nonce
	)

References BLOCKLEN, Cipher(), Key, KeyExpansion(), and state.

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Variable Documentation

state

state_t* state

static

Referenced by AES_CBC_decrypt_buffer(), AES_CBC_encrypt_buffer(), AES_CTR_xcrypt_buffer(), AES_ECB_decrypt(), AES_ECB_encrypt(), InvSubBytes(), and SubBytes().

RoundKey

uint8_t RoundKey[keyExpSize]

static

Referenced by AddRoundKey(), and KeyExpansion().

Key

const uint8_t* Key

static

Referenced by AES_CBC_decrypt_buffer(), AES_CBC_encrypt_buffer(), AES_CTR_xcrypt_buffer(), AES_ECB_decrypt(), AES_ECB_encrypt(), and KeyExpansion().

Iv

uint8_t* Iv

static

Referenced by AES_CBC_decrypt_buffer(), AES_CBC_encrypt_buffer(), and XorWithIv().

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 }

Referenced by getSBoxValue().

rsbox

const uint8_t rsbox[256]

static

Initial value:

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

Referenced by getSBoxInvert().

Rcon

const uint8_t Rcon[11]

static

Initial value:

= {
  0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 }

Referenced by KeyExpansion().