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aes.c
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aes.c
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
/* AES implementation by Tom St Denis
*
* Derived from the Public Domain source code by
---
* rijndael-alg-fst.c
*
* @version 3.0 (December 2000)
*
* Optimised ANSI C code for the Rijndael cipher (now AES)
*
* @author Vincent Rijmen <vincent.rijmen@esat.kuleuven.ac.be>
* @author Antoon Bosselaers <antoon.bosselaers@esat.kuleuven.ac.be>
* @author Paulo Barreto <paulo.barreto@terra.com.br>
---
*/
/**
@file aes.c
Implementation of AES
*/
#include "tomcrypt_private.h"
#ifdef LTC_RIJNDAEL
#ifndef ENCRYPT_ONLY
#define SETUP rijndael_setup
#define ECB_ENC rijndael_ecb_encrypt
#define ECB_DEC rijndael_ecb_decrypt
#define ECB_DONE rijndael_done
#define ECB_TEST rijndael_test
#define ECB_KS rijndael_keysize
const struct ltc_cipher_descriptor rijndael_desc =
{
"rijndael",
6,
16, 32, 16, 10,
SETUP, ECB_ENC, ECB_DEC, ECB_TEST, ECB_DONE, ECB_KS,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
#else
#define SETUP rijndael_enc_setup
#define ECB_ENC rijndael_enc_ecb_encrypt
#define ECB_KS rijndael_enc_keysize
#define ECB_DONE rijndael_enc_done
const struct ltc_cipher_descriptor rijndael_enc_desc =
{
"rijndael",
6,
16, 32, 16, 10,
SETUP, ECB_ENC, NULL, NULL, ECB_DONE, ECB_KS,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
#endif
#define LTC_AES_TAB_C
#include "aes_tab.c"
static ulong32 setup_mix(ulong32 temp)
{
return (Te4_3[LTC_BYTE(temp, 2)]) ^
(Te4_2[LTC_BYTE(temp, 1)]) ^
(Te4_1[LTC_BYTE(temp, 0)]) ^
(Te4_0[LTC_BYTE(temp, 3)]);
}
#ifndef ENCRYPT_ONLY
#ifdef LTC_SMALL_CODE
static ulong32 setup_mix2(ulong32 temp)
{
return Td0(255 & Te4[LTC_BYTE(temp, 3)]) ^
Td1(255 & Te4[LTC_BYTE(temp, 2)]) ^
Td2(255 & Te4[LTC_BYTE(temp, 1)]) ^
Td3(255 & Te4[LTC_BYTE(temp, 0)]);
}
#endif
#endif
/**
Initialize the AES (Rijndael) block cipher
@param key The symmetric key you wish to pass
@param keylen The key length in bytes
@param num_rounds The number of rounds desired (0 for default)
@param skey The key in as scheduled by this function.
@return CRYPT_OK if successful
*/
int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
{
int i;
ulong32 temp, *rk, *K;
#ifndef ENCRYPT_ONLY
ulong32 *rrk;
#endif
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(skey != NULL);
if (keylen != 16 && keylen != 24 && keylen != 32) {
return CRYPT_INVALID_KEYSIZE;
}
if (num_rounds != 0 && num_rounds != (10 + ((keylen/8)-2)*2)) {
return CRYPT_INVALID_ROUNDS;
}
skey->rijndael.Nr = 10 + ((keylen/8)-2)*2;
K = LTC_ALIGN_BUF(skey->rijndael.K, 16);
skey->rijndael.eK = K;
K += 60;
skey->rijndael.dK = K;
/* setup the forward key */
i = 0;
rk = skey->rijndael.eK;
LOAD32H(rk[0], key );
LOAD32H(rk[1], key + 4);
LOAD32H(rk[2], key + 8);
LOAD32H(rk[3], key + 12);
if (keylen == 16) {
for (;;) {
temp = rk[3];
rk[4] = rk[0] ^ setup_mix(temp) ^ rcon[i];
rk[5] = rk[1] ^ rk[4];
rk[6] = rk[2] ^ rk[5];
rk[7] = rk[3] ^ rk[6];
if (++i == 10) {
break;
}
rk += 4;
}
} else if (keylen == 24) {
LOAD32H(rk[4], key + 16);
LOAD32H(rk[5], key + 20);
for (;;) {
#ifdef _MSC_VER
temp = skey->rijndael.eK[rk - skey->rijndael.eK + 5];
#else
temp = rk[5];
#endif
rk[ 6] = rk[ 0] ^ setup_mix(temp) ^ rcon[i];
rk[ 7] = rk[ 1] ^ rk[ 6];
rk[ 8] = rk[ 2] ^ rk[ 7];
rk[ 9] = rk[ 3] ^ rk[ 8];
if (++i == 8) {
break;
}
rk[10] = rk[ 4] ^ rk[ 9];
rk[11] = rk[ 5] ^ rk[10];
rk += 6;
}
} else if (keylen == 32) {
LOAD32H(rk[4], key + 16);
LOAD32H(rk[5], key + 20);
LOAD32H(rk[6], key + 24);
LOAD32H(rk[7], key + 28);
for (;;) {
#ifdef _MSC_VER
temp = skey->rijndael.eK[rk - skey->rijndael.eK + 7];
#else
temp = rk[7];
#endif
rk[ 8] = rk[ 0] ^ setup_mix(temp) ^ rcon[i];
rk[ 9] = rk[ 1] ^ rk[ 8];
rk[10] = rk[ 2] ^ rk[ 9];
rk[11] = rk[ 3] ^ rk[10];
if (++i == 7) {
break;
}
temp = rk[11];
rk[12] = rk[ 4] ^ setup_mix(RORc(temp, 8));
rk[13] = rk[ 5] ^ rk[12];
rk[14] = rk[ 6] ^ rk[13];
rk[15] = rk[ 7] ^ rk[14];
rk += 8;
}
} else {
/* this can't happen */
/* coverity[dead_error_line] */
return CRYPT_ERROR;
}
#ifndef ENCRYPT_ONLY
/* setup the inverse key now */
rk = skey->rijndael.dK;
rrk = skey->rijndael.eK + (28 + keylen) - 4;
/* apply the inverse MixColumn transform to all round keys but the first and the last: */
/* copy first */
*rk++ = *rrk++;
*rk++ = *rrk++;
*rk++ = *rrk++;
*rk = *rrk;
rk -= 3; rrk -= 3;
for (i = 1; i < skey->rijndael.Nr; i++) {
rrk -= 4;
rk += 4;
#ifdef LTC_SMALL_CODE
temp = rrk[0];
rk[0] = setup_mix2(temp);
temp = rrk[1];
rk[1] = setup_mix2(temp);
temp = rrk[2];
rk[2] = setup_mix2(temp);
temp = rrk[3];
rk[3] = setup_mix2(temp);
#else
temp = rrk[0];
rk[0] =
Tks0[LTC_BYTE(temp, 3)] ^
Tks1[LTC_BYTE(temp, 2)] ^
Tks2[LTC_BYTE(temp, 1)] ^
Tks3[LTC_BYTE(temp, 0)];
temp = rrk[1];
rk[1] =
Tks0[LTC_BYTE(temp, 3)] ^
Tks1[LTC_BYTE(temp, 2)] ^
Tks2[LTC_BYTE(temp, 1)] ^
Tks3[LTC_BYTE(temp, 0)];
temp = rrk[2];
rk[2] =
Tks0[LTC_BYTE(temp, 3)] ^
Tks1[LTC_BYTE(temp, 2)] ^
Tks2[LTC_BYTE(temp, 1)] ^
Tks3[LTC_BYTE(temp, 0)];
temp = rrk[3];
rk[3] =
Tks0[LTC_BYTE(temp, 3)] ^
Tks1[LTC_BYTE(temp, 2)] ^
Tks2[LTC_BYTE(temp, 1)] ^
Tks3[LTC_BYTE(temp, 0)];
#endif
}
/* copy last */
rrk -= 4;
rk += 4;
*rk++ = *rrk++;
*rk++ = *rrk++;
*rk++ = *rrk++;
*rk = *rrk;
#endif /* ENCRYPT_ONLY */
return CRYPT_OK;
}
/**
Encrypts a block of text with AES
@param pt The input plaintext (16 bytes)
@param ct The output ciphertext (16 bytes)
@param skey The key as scheduled
@return CRYPT_OK if successful
*/
#ifdef LTC_CLEAN_STACK
static int s_rijndael_ecb_encrypt(const unsigned char *pt, unsigned char *ct, const symmetric_key *skey)
#else
int ECB_ENC(const unsigned char *pt, unsigned char *ct, const symmetric_key *skey)
#endif
{
ulong32 s0, s1, s2, s3, t0, t1, t2, t3;
const ulong32 *rk;
int Nr, r;
LTC_ARGCHK(pt != NULL);
LTC_ARGCHK(ct != NULL);
LTC_ARGCHK(skey != NULL);
Nr = skey->rijndael.Nr;
if (Nr < 2 || Nr > 16)
return CRYPT_INVALID_ROUNDS;
rk = skey->rijndael.eK;
/*
* map byte array block to cipher state
* and add initial round key:
*/
LOAD32H(s0, pt ); s0 ^= rk[0];
LOAD32H(s1, pt + 4); s1 ^= rk[1];
LOAD32H(s2, pt + 8); s2 ^= rk[2];
LOAD32H(s3, pt + 12); s3 ^= rk[3];
#ifdef LTC_SMALL_CODE
for (r = 0; ; r++) {
rk += 4;
t0 =
Te0(LTC_BYTE(s0, 3)) ^
Te1(LTC_BYTE(s1, 2)) ^
Te2(LTC_BYTE(s2, 1)) ^
Te3(LTC_BYTE(s3, 0)) ^
rk[0];
t1 =
Te0(LTC_BYTE(s1, 3)) ^
Te1(LTC_BYTE(s2, 2)) ^
Te2(LTC_BYTE(s3, 1)) ^
Te3(LTC_BYTE(s0, 0)) ^
rk[1];
t2 =
Te0(LTC_BYTE(s2, 3)) ^
Te1(LTC_BYTE(s3, 2)) ^
Te2(LTC_BYTE(s0, 1)) ^
Te3(LTC_BYTE(s1, 0)) ^
rk[2];
t3 =
Te0(LTC_BYTE(s3, 3)) ^
Te1(LTC_BYTE(s0, 2)) ^
Te2(LTC_BYTE(s1, 1)) ^
Te3(LTC_BYTE(s2, 0)) ^
rk[3];
if (r == Nr-2) {
break;
}
s0 = t0; s1 = t1; s2 = t2; s3 = t3;
}
rk += 4;
#else
/*
* Nr - 1 full rounds:
*/
r = Nr >> 1;
for (;;) {
t0 =
Te0(LTC_BYTE(s0, 3)) ^
Te1(LTC_BYTE(s1, 2)) ^
Te2(LTC_BYTE(s2, 1)) ^
Te3(LTC_BYTE(s3, 0)) ^
rk[4];
t1 =
Te0(LTC_BYTE(s1, 3)) ^
Te1(LTC_BYTE(s2, 2)) ^
Te2(LTC_BYTE(s3, 1)) ^
Te3(LTC_BYTE(s0, 0)) ^
rk[5];
t2 =
Te0(LTC_BYTE(s2, 3)) ^
Te1(LTC_BYTE(s3, 2)) ^
Te2(LTC_BYTE(s0, 1)) ^
Te3(LTC_BYTE(s1, 0)) ^
rk[6];
t3 =
Te0(LTC_BYTE(s3, 3)) ^
Te1(LTC_BYTE(s0, 2)) ^
Te2(LTC_BYTE(s1, 1)) ^
Te3(LTC_BYTE(s2, 0)) ^
rk[7];
rk += 8;
if (--r == 0) {
break;
}
s0 =
Te0(LTC_BYTE(t0, 3)) ^
Te1(LTC_BYTE(t1, 2)) ^
Te2(LTC_BYTE(t2, 1)) ^
Te3(LTC_BYTE(t3, 0)) ^
rk[0];
s1 =
Te0(LTC_BYTE(t1, 3)) ^
Te1(LTC_BYTE(t2, 2)) ^
Te2(LTC_BYTE(t3, 1)) ^
Te3(LTC_BYTE(t0, 0)) ^
rk[1];
s2 =
Te0(LTC_BYTE(t2, 3)) ^
Te1(LTC_BYTE(t3, 2)) ^
Te2(LTC_BYTE(t0, 1)) ^
Te3(LTC_BYTE(t1, 0)) ^
rk[2];
s3 =
Te0(LTC_BYTE(t3, 3)) ^
Te1(LTC_BYTE(t0, 2)) ^
Te2(LTC_BYTE(t1, 1)) ^
Te3(LTC_BYTE(t2, 0)) ^
rk[3];
}
#endif
/*
* apply last round and
* map cipher state to byte array block:
*/
s0 =
(Te4_3[LTC_BYTE(t0, 3)]) ^
(Te4_2[LTC_BYTE(t1, 2)]) ^
(Te4_1[LTC_BYTE(t2, 1)]) ^
(Te4_0[LTC_BYTE(t3, 0)]) ^
rk[0];
STORE32H(s0, ct);
s1 =
(Te4_3[LTC_BYTE(t1, 3)]) ^
(Te4_2[LTC_BYTE(t2, 2)]) ^
(Te4_1[LTC_BYTE(t3, 1)]) ^
(Te4_0[LTC_BYTE(t0, 0)]) ^
rk[1];
STORE32H(s1, ct+4);
s2 =
(Te4_3[LTC_BYTE(t2, 3)]) ^
(Te4_2[LTC_BYTE(t3, 2)]) ^
(Te4_1[LTC_BYTE(t0, 1)]) ^
(Te4_0[LTC_BYTE(t1, 0)]) ^
rk[2];
STORE32H(s2, ct+8);
s3 =
(Te4_3[LTC_BYTE(t3, 3)]) ^
(Te4_2[LTC_BYTE(t0, 2)]) ^
(Te4_1[LTC_BYTE(t1, 1)]) ^
(Te4_0[LTC_BYTE(t2, 0)]) ^
rk[3];
STORE32H(s3, ct+12);
return CRYPT_OK;
}
#ifdef LTC_CLEAN_STACK
int ECB_ENC(const unsigned char *pt, unsigned char *ct, const symmetric_key *skey)
{
int err = s_rijndael_ecb_encrypt(pt, ct, skey);
burn_stack(sizeof(unsigned long)*8 + sizeof(unsigned long*) + sizeof(int)*2);
return err;
}
#endif
#ifndef ENCRYPT_ONLY
/**
Decrypts a block of text with AES
@param ct The input ciphertext (16 bytes)
@param pt The output plaintext (16 bytes)
@param skey The key as scheduled
@return CRYPT_OK if successful
*/
#ifdef LTC_CLEAN_STACK
static int s_rijndael_ecb_decrypt(const unsigned char *ct, unsigned char *pt, const symmetric_key *skey)
#else
int ECB_DEC(const unsigned char *ct, unsigned char *pt, const symmetric_key *skey)
#endif
{
ulong32 s0, s1, s2, s3, t0, t1, t2, t3;
const ulong32 *rk;
int Nr, r;
LTC_ARGCHK(pt != NULL);
LTC_ARGCHK(ct != NULL);
LTC_ARGCHK(skey != NULL);
Nr = skey->rijndael.Nr;
if (Nr < 2 || Nr > 16)
return CRYPT_INVALID_ROUNDS;
rk = skey->rijndael.dK;
/*
* map byte array block to cipher state
* and add initial round key:
*/
LOAD32H(s0, ct ); s0 ^= rk[0];
LOAD32H(s1, ct + 4); s1 ^= rk[1];
LOAD32H(s2, ct + 8); s2 ^= rk[2];
LOAD32H(s3, ct + 12); s3 ^= rk[3];
#ifdef LTC_SMALL_CODE
for (r = 0; ; r++) {
rk += 4;
t0 =
Td0(LTC_BYTE(s0, 3)) ^
Td1(LTC_BYTE(s3, 2)) ^
Td2(LTC_BYTE(s2, 1)) ^
Td3(LTC_BYTE(s1, 0)) ^
rk[0];
t1 =
Td0(LTC_BYTE(s1, 3)) ^
Td1(LTC_BYTE(s0, 2)) ^
Td2(LTC_BYTE(s3, 1)) ^
Td3(LTC_BYTE(s2, 0)) ^
rk[1];
t2 =
Td0(LTC_BYTE(s2, 3)) ^
Td1(LTC_BYTE(s1, 2)) ^
Td2(LTC_BYTE(s0, 1)) ^
Td3(LTC_BYTE(s3, 0)) ^
rk[2];
t3 =
Td0(LTC_BYTE(s3, 3)) ^
Td1(LTC_BYTE(s2, 2)) ^
Td2(LTC_BYTE(s1, 1)) ^
Td3(LTC_BYTE(s0, 0)) ^
rk[3];
if (r == Nr-2) {
break;
}
s0 = t0; s1 = t1; s2 = t2; s3 = t3;
}
rk += 4;
#else
/*
* Nr - 1 full rounds:
*/
r = Nr >> 1;
for (;;) {
t0 =
Td0(LTC_BYTE(s0, 3)) ^
Td1(LTC_BYTE(s3, 2)) ^
Td2(LTC_BYTE(s2, 1)) ^
Td3(LTC_BYTE(s1, 0)) ^
rk[4];
t1 =
Td0(LTC_BYTE(s1, 3)) ^
Td1(LTC_BYTE(s0, 2)) ^
Td2(LTC_BYTE(s3, 1)) ^
Td3(LTC_BYTE(s2, 0)) ^
rk[5];
t2 =
Td0(LTC_BYTE(s2, 3)) ^
Td1(LTC_BYTE(s1, 2)) ^
Td2(LTC_BYTE(s0, 1)) ^
Td3(LTC_BYTE(s3, 0)) ^
rk[6];
t3 =
Td0(LTC_BYTE(s3, 3)) ^
Td1(LTC_BYTE(s2, 2)) ^
Td2(LTC_BYTE(s1, 1)) ^
Td3(LTC_BYTE(s0, 0)) ^
rk[7];
rk += 8;
if (--r == 0) {
break;
}
s0 =
Td0(LTC_BYTE(t0, 3)) ^
Td1(LTC_BYTE(t3, 2)) ^
Td2(LTC_BYTE(t2, 1)) ^
Td3(LTC_BYTE(t1, 0)) ^
rk[0];
s1 =
Td0(LTC_BYTE(t1, 3)) ^
Td1(LTC_BYTE(t0, 2)) ^
Td2(LTC_BYTE(t3, 1)) ^
Td3(LTC_BYTE(t2, 0)) ^
rk[1];
s2 =
Td0(LTC_BYTE(t2, 3)) ^
Td1(LTC_BYTE(t1, 2)) ^
Td2(LTC_BYTE(t0, 1)) ^
Td3(LTC_BYTE(t3, 0)) ^
rk[2];
s3 =
Td0(LTC_BYTE(t3, 3)) ^
Td1(LTC_BYTE(t2, 2)) ^
Td2(LTC_BYTE(t1, 1)) ^
Td3(LTC_BYTE(t0, 0)) ^
rk[3];
}
#endif
/*
* apply last round and
* map cipher state to byte array block:
*/
s0 =
(Td4[LTC_BYTE(t0, 3)] & 0xff000000) ^
(Td4[LTC_BYTE(t3, 2)] & 0x00ff0000) ^
(Td4[LTC_BYTE(t2, 1)] & 0x0000ff00) ^
(Td4[LTC_BYTE(t1, 0)] & 0x000000ff) ^
rk[0];
STORE32H(s0, pt);
s1 =
(Td4[LTC_BYTE(t1, 3)] & 0xff000000) ^
(Td4[LTC_BYTE(t0, 2)] & 0x00ff0000) ^
(Td4[LTC_BYTE(t3, 1)] & 0x0000ff00) ^
(Td4[LTC_BYTE(t2, 0)] & 0x000000ff) ^
rk[1];
STORE32H(s1, pt+4);
s2 =
(Td4[LTC_BYTE(t2, 3)] & 0xff000000) ^
(Td4[LTC_BYTE(t1, 2)] & 0x00ff0000) ^
(Td4[LTC_BYTE(t0, 1)] & 0x0000ff00) ^
(Td4[LTC_BYTE(t3, 0)] & 0x000000ff) ^
rk[2];
STORE32H(s2, pt+8);
s3 =
(Td4[LTC_BYTE(t3, 3)] & 0xff000000) ^
(Td4[LTC_BYTE(t2, 2)] & 0x00ff0000) ^
(Td4[LTC_BYTE(t1, 1)] & 0x0000ff00) ^
(Td4[LTC_BYTE(t0, 0)] & 0x000000ff) ^
rk[3];
STORE32H(s3, pt+12);
return CRYPT_OK;
}
#ifdef LTC_CLEAN_STACK
int ECB_DEC(const unsigned char *ct, unsigned char *pt, const symmetric_key *skey)
{
int err = s_rijndael_ecb_decrypt(ct, pt, skey);
burn_stack(sizeof(unsigned long)*8 + sizeof(unsigned long*) + sizeof(int)*2);
return err;
}
#endif
/**
Performs a self-test of the AES block cipher
@return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
*/
int ECB_TEST(void)
{
#ifndef LTC_TEST
return CRYPT_NOP;
#else
int err;
static const struct {
int keylen;
unsigned char key[32], pt[16], ct[16];
} tests[] = {
{ 16,
{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
{ 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
{ 0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30,
0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a }
}, {
24,
{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
{ 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
{ 0xdd, 0xa9, 0x7c, 0xa4, 0x86, 0x4c, 0xdf, 0xe0,
0x6e, 0xaf, 0x70, 0xa0, 0xec, 0x0d, 0x71, 0x91 }
}, {
32,
{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
{ 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
{ 0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf,
0xea, 0xfc, 0x49, 0x90, 0x4b, 0x49, 0x60, 0x89 }
}
};
symmetric_key key;
unsigned char tmp[2][16];
int i, y;
for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
zeromem(&key, sizeof(key));
if ((err = rijndael_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) {
return err;
}
rijndael_ecb_encrypt(tests[i].pt, tmp[0], &key);
rijndael_ecb_decrypt(tmp[0], tmp[1], &key);
if (compare_testvector(tmp[0], 16, tests[i].ct, 16, "AES Encrypt", i) ||
compare_testvector(tmp[1], 16, tests[i].pt, 16, "AES Decrypt", i)) {
return CRYPT_FAIL_TESTVECTOR;
}
/* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
for (y = 0; y < 16; y++) tmp[0][y] = 0;
for (y = 0; y < 1000; y++) rijndael_ecb_encrypt(tmp[0], tmp[0], &key);
for (y = 0; y < 1000; y++) rijndael_ecb_decrypt(tmp[0], tmp[0], &key);
for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
}
return CRYPT_OK;
#endif
}
#endif /* ENCRYPT_ONLY */
/** Terminate the context
@param skey The scheduled key
*/
void ECB_DONE(symmetric_key *skey)
{
LTC_UNUSED_PARAM(skey);
}
/**
Gets suitable key size
@param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable.
@return CRYPT_OK if the input key size is acceptable.
*/
int ECB_KS(int *keysize)
{
LTC_ARGCHK(keysize != NULL);
if (*keysize < 16) {
return CRYPT_INVALID_KEYSIZE;
}
if (*keysize < 24) {
*keysize = 16;
return CRYPT_OK;
}
if (*keysize < 32) {
*keysize = 24;
return CRYPT_OK;
}
*keysize = 32;
return CRYPT_OK;
}
#endif