?? rijndael-api-fst.c
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/**
* rijndael-api-fst.c
*
* @version 2.9 (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>
*
* This code is hereby placed in the public domain.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Acknowledgements:
*
* We are deeply indebted to the following people for their bug reports,
* fixes, and improvement suggestions to this implementation. Though we
* tried to list all contributions, we apologise in advance for any
* missing reference.
*
* Andrew Bales <Andrew.Bales@Honeywell.com>
* Markus Friedl <markus.friedl@informatik.uni-erlangen.de>
* John Skodon <skodonj@webquill.com>
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "rijndael-alg-fst.h"
#include "rijndael-api-fst.h"
int makeKey(keyInstance *key, BYTE direction, int keyLen, char *keyMaterial) {
int i;
char *keyMat;
u8 cipherKey[MAXKB];
if (key == NULL) {
return BAD_KEY_INSTANCE;
}
if ((direction == DIR_ENCRYPT) || (direction == DIR_DECRYPT)) {
key->direction = direction;
} else {
return BAD_KEY_DIR;
}
if ((keyLen == 128) || (keyLen == 192) || (keyLen == 256)) {
key->keyLen = keyLen;
} else {
return BAD_KEY_MAT;
}
if (keyMaterial != NULL) {
strncpy(key->keyMaterial, keyMaterial, keyLen/4);
}
/* initialize key schedule: */
keyMat = key->keyMaterial;
for (i = 0; i < key->keyLen/8; i++) {
int t, v;
t = *keyMat++;
if ((t >= '0') && (t <= '9')) v = (t - '0') << 4;
else if ((t >= 'a') && (t <= 'f')) v = (t - 'a' + 10) << 4;
else if ((t >= 'A') && (t <= 'F')) v = (t - 'A' + 10) << 4;
else return BAD_KEY_MAT;
t = *keyMat++;
if ((t >= '0') && (t <= '9')) v ^= (t - '0');
else if ((t >= 'a') && (t <= 'f')) v ^= (t - 'a' + 10);
else if ((t >= 'A') && (t <= 'F')) v ^= (t - 'A' + 10);
else return BAD_KEY_MAT;
cipherKey[i] = (u8)v;
}
if (direction == DIR_ENCRYPT) {
key->Nr = rijndaelKeySetupEnc(key->rk, cipherKey, keyLen);
} else {
key->Nr = rijndaelKeySetupDec(key->rk, cipherKey, keyLen);
}
rijndaelKeySetupEnc(key->ek, cipherKey, keyLen);
return TRUE;
}
int cipherInit(cipherInstance *cipher, BYTE mode, char *IV) {
if ((mode == MODE_ECB) || (mode == MODE_CBC) || (mode == MODE_CFB1)) {
cipher->mode = mode;
} else {
return BAD_CIPHER_MODE;
}
if (IV != NULL) {
int i;
for (i = 0; i < MAX_IV_SIZE; i++) {
int t, j;
t = IV[2*i];
if ((t >= '0') && (t <= '9')) j = (t - '0') << 4;
else if ((t >= 'a') && (t <= 'f')) j = (t - 'a' + 10) << 4;
else if ((t >= 'A') && (t <= 'F')) j = (t - 'A' + 10) << 4;
else return BAD_CIPHER_INSTANCE;
t = IV[2*i+1];
if ((t >= '0') && (t <= '9')) j ^= (t - '0');
else if ((t >= 'a') && (t <= 'f')) j ^= (t - 'a' + 10);
else if ((t >= 'A') && (t <= 'F')) j ^= (t - 'A' + 10);
else return BAD_CIPHER_INSTANCE;
cipher->IV[i] = (u8)j;
}
} else {
memset(cipher->IV, 0, MAX_IV_SIZE);
}
return TRUE;
}
int blockEncrypt(cipherInstance *cipher, keyInstance *key,
BYTE *input, int inputLen, BYTE *outBuffer) {
int i, k, t, numBlocks;
u8 block[16], *iv;
if (cipher == NULL ||
key == NULL ||
key->direction == DIR_DECRYPT) {
return BAD_CIPHER_STATE;
}
if (input == NULL || inputLen <= 0) {
return 0; /* nothing to do */
}
numBlocks = inputLen/16;
switch (cipher->mode) {
case MODE_ECB:
for (i = numBlocks; i > 0; i--) {
rijndaelEncrypt(key->rk, key->Nr, input, outBuffer);
input += 16;
outBuffer += 16;
}
break;
case MODE_CBC:
iv = cipher->IV;
for (i = numBlocks; i > 0; i--) {
((u32*)block)[0] = ((u32*)input)[0] ^ ((u32*)iv)[0];
((u32*)block)[1] = ((u32*)input)[1] ^ ((u32*)iv)[1];
((u32*)block)[2] = ((u32*)input)[2] ^ ((u32*)iv)[2];
((u32*)block)[3] = ((u32*)input)[3] ^ ((u32*)iv)[3];
rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
iv = outBuffer;
input += 16;
outBuffer += 16;
}
break;
case MODE_CFB1:
iv = cipher->IV;
for (i = numBlocks; i > 0; i--) {
memcpy(outBuffer, input, 16);
for (k = 0; k < 128; k++) {
rijndaelEncrypt(key->ek, key->Nr, iv, block);
outBuffer[k >> 3] ^= (block[0] & 0x80U) >> (k & 7);
for (t = 0; t < 15; t++) {
iv[t] = (iv[t] << 1) | (iv[t + 1] >> 7);
}
iv[15] = (iv[15] << 1) | ((outBuffer[k >> 3] >> (7 - (k & 7))) & 1);
}
outBuffer += 16;
input += 16;
}
break;
default:
return BAD_CIPHER_STATE;
}
return 16*numBlocks;
}
/**
* Encrypt data partitioned in octets, using RFC 2040-like padding.
*
* @param input data to be encrypted (octet sequence)
* @param inputOctets input length in octets (not bits)
* @param outBuffer encrypted output data
*
* @return length in octets (not bits) of the encrypted output buffer.
*/
int padEncrypt(cipherInstance *cipher, keyInstance *key,
BYTE *input, int inputOctets, BYTE *outBuffer) {
int i, numBlocks, padLen;
u8 block[16], *iv;
if (cipher == NULL ||
key == NULL ||
key->direction == DIR_DECRYPT) {
return BAD_CIPHER_STATE;
}
if (input == NULL || inputOctets <= 0) {
return 0; /* nothing to do */
}
numBlocks = inputOctets/16;
switch (cipher->mode) {
case MODE_ECB:
for (i = numBlocks; i > 0; i--) {
rijndaelEncrypt(key->rk, key->Nr, input, outBuffer);
input += 16;
outBuffer += 16;
}
padLen = 16 - (inputOctets - 16*numBlocks);
assert(padLen > 0 && padLen <= 16);
memcpy(block, input, 16 - padLen);
memset(block + 16 - padLen, padLen, padLen);
rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
break;
case MODE_CBC:
iv = cipher->IV;
for (i = numBlocks; i > 0; i--) {
((u32*)block)[0] = ((u32*)input)[0] ^ ((u32*)iv)[0];
((u32*)block)[1] = ((u32*)input)[1] ^ ((u32*)iv)[1];
((u32*)block)[2] = ((u32*)input)[2] ^ ((u32*)iv)[2];
((u32*)block)[3] = ((u32*)input)[3] ^ ((u32*)iv)[3];
rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
iv = outBuffer;
input += 16;
outBuffer += 16;
}
padLen = 16 - (inputOctets - 16*numBlocks);
assert(padLen > 0 && padLen <= 16);
for (i = 0; i < 16 - padLen; i++) {
block[i] = input[i] ^ iv[i];
}
for (i = 16 - padLen; i < 16; i++) {
block[i] = (BYTE)padLen ^ iv[i];
}
rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
break;
default:
return BAD_CIPHER_STATE;
}
return 16*(numBlocks + 1);
}
int blockDecrypt(cipherInstance *cipher, keyInstance *key,
BYTE *input, int inputLen, BYTE *outBuffer) {
int i, k, t, numBlocks;
u8 block[16], *iv;
if (cipher == NULL ||
key == NULL ||
cipher->mode != MODE_CFB1 && key->direction == DIR_ENCRYPT) {
return BAD_CIPHER_STATE;
}
if (input == NULL || inputLen <= 0) {
return 0; /* nothing to do */
}
numBlocks = inputLen/16;
switch (cipher->mode) {
case MODE_ECB:
for (i = numBlocks; i > 0; i--) {
rijndaelDecrypt(key->rk, key->Nr, input, outBuffer);
input += 16;
outBuffer += 16;
}
break;
case MODE_CBC:
iv = cipher->IV;
for (i = numBlocks; i > 0; i--) {
rijndaelDecrypt(key->rk, key->Nr, input, block);
((u32*)block)[0] ^= ((u32*)iv)[0];
((u32*)block)[1] ^= ((u32*)iv)[1];
((u32*)block)[2] ^= ((u32*)iv)[2];
((u32*)block)[3] ^= ((u32*)iv)[3];
memcpy(cipher->IV, input, 16);
memcpy(outBuffer, block, 16);
input += 16;
outBuffer += 16;
}
break;
case MODE_CFB1:
iv = cipher->IV;
for (i = numBlocks; i > 0; i--) {
memcpy(outBuffer, input, 16);
for (k = 0; k < 128; k++) {
rijndaelEncrypt(key->ek, key->Nr, iv, block);
for (t = 0; t < 15; t++) {
iv[t] = (iv[t] << 1) | (iv[t + 1] >> 7);
}
iv[15] = (iv[15] << 1) | ((input[k >> 3] >> (7 - (k & 7))) & 1);
outBuffer[k >> 3] ^= (block[0] & 0x80U) >> (k & 7);
}
outBuffer += 16;
input += 16;
}
break;
default:
return BAD_CIPHER_STATE;
}
return 16*numBlocks;
}
int padDecrypt(cipherInstance *cipher, keyInstance *key,
BYTE *input, int inputOctets, BYTE *outBuffer) {
int i, numBlocks, padLen;
u8 block[16];
if (cipher == NULL ||
key == NULL ||
key->direction == DIR_ENCRYPT) {
return BAD_CIPHER_STATE;
}
if (input == NULL || inputOctets <= 0) {
return 0; /* nothing to do */
}
if (inputOctets % 16 != 0) {
return BAD_DATA;
}
numBlocks = inputOctets/16;
switch (cipher->mode) {
case MODE_ECB:
/* all blocks but last */
for (i = numBlocks - 1; i > 0; i--) {
rijndaelDecrypt(key->rk, key->Nr, input, outBuffer);
input += 16;
outBuffer += 16;
}
/* last block */
rijndaelDecrypt(key->rk, key->Nr, input, block);
padLen = block[15];
if (padLen >= 16) {
return BAD_DATA;
}
for (i = 16 - padLen; i < 16; i++) {
if (block[i] != padLen) {
return BAD_DATA;
}
}
memcpy(outBuffer, block, 16 - padLen);
break;
case MODE_CBC:
/* all blocks but last */
for (i = numBlocks - 1; i > 0; i--) {
rijndaelDecrypt(key->rk, key->Nr, input, block);
((u32*)block)[0] ^= ((u32*)cipher->IV)[0];
((u32*)block)[1] ^= ((u32*)cipher->IV)[1];
((u32*)block)[2] ^= ((u32*)cipher->IV)[2];
((u32*)block)[3] ^= ((u32*)cipher->IV)[3];
memcpy(cipher->IV, input, 16);
memcpy(outBuffer, block, 16);
input += 16;
outBuffer += 16;
}
/* last block */
rijndaelDecrypt(key->rk, key->Nr, input, block);
((u32*)block)[0] ^= ((u32*)cipher->IV)[0];
((u32*)block)[1] ^= ((u32*)cipher->IV)[1];
((u32*)block)[2] ^= ((u32*)cipher->IV)[2];
((u32*)block)[3] ^= ((u32*)cipher->IV)[3];
padLen = block[15];
if (padLen <= 0 || padLen > 16) {
return BAD_DATA;
}
for (i = 16 - padLen; i < 16; i++) {
if (block[i] != padLen) {
return BAD_DATA;
}
}
memcpy(outBuffer, block, 16 - padLen);
break;
default:
return BAD_CIPHER_STATE;
}
return 16*numBlocks - padLen;
}
#ifdef INTERMEDIATE_VALUE_KAT
/**
* cipherUpdateRounds:
*
* Encrypts/Decrypts exactly one full block a specified number of rounds.
* Only used in the Intermediate Value Known Answer Test.
*
* Returns:
* TRUE - on success
* BAD_CIPHER_STATE - cipher in bad state (e.g., not initialized)
*/
int cipherUpdateRounds(cipherInstance *cipher, keyInstance *key,
BYTE *input, int inputLen, BYTE *outBuffer, int rounds) {
u8 block[16];
if (cipher == NULL || key == NULL) {
return BAD_CIPHER_STATE;
}
memcpy(block, input, 16);
switch (key->direction) {
case DIR_ENCRYPT:
rijndaelEncryptRound(key->rk, key->Nr, block, rounds);
break;
case DIR_DECRYPT:
rijndaelDecryptRound(key->rk, key->Nr, block, rounds);
break;
default:
return BAD_KEY_DIR;
}
memcpy(outBuffer, block, 16);
return TRUE;
}
#endif /* INTERMEDIATE_VALUE_KAT */
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