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/* rijndael-api-ref.c v2.1 April 2000
* Reference ANSI C code
* authors: v2.0 Paulo Barreto
* Vincent Rijmen, K.U.Leuven
* v2.1 Vincent Rijmen, K.U.Leuven
*
* This code is placed in the public domain.
*/
#include "mvOs.h"
#include "mvAes.h"
#include "mvAesAlg.h"
/* Defines:
Add any additional defines you need
*/
#define MODE_ECB 1 /* Are we ciphering in ECB mode? */
#define MODE_CBC 2 /* Are we ciphering in CBC mode? */
#define MODE_CFB1 3 /* Are we ciphering in 1-bit CFB mode? */
int aesMakeKey(MV_U8 *expandedKey, MV_U8 *keyMaterial, int keyLen, int blockLen)
{
MV_U8 W[MAXROUNDS+1][4][MAXBC];
MV_U8 k[4][MAXKC];
MV_U8 j;
int i, rounds, KC;
if (expandedKey == NULL)
{
return AES_BAD_KEY_INSTANCE;
}
if (!((keyLen == 128) || (keyLen == 192) || (keyLen == 256)))
{
return AES_BAD_KEY_MAT;
}
if (keyMaterial == NULL)
{
return AES_BAD_KEY_MAT;
}
/* initialize key schedule: */
for(i=0; i<keyLen/8; i++)
{
j = keyMaterial[i];
k[i % 4][i / 4] = j;
}
rijndaelKeySched (k, keyLen, blockLen, W);
#ifdef MV_AES_DEBUG
{
MV_U8* pW = &W[0][0][0];
int x;
mvOsPrintf("Expended Key: size = %d\n", sizeof(W));
for(i=0; i<sizeof(W); i++)
{
mvOsPrintf("%02x ", pW[i]);
}
for(i=0; i<MAXROUNDS+1; i++)
{
mvOsPrintf("\n Round #%02d: ", i);
for(x=0; x<MAXBC; x++)
{
mvOsPrintf("%02x%02x%02x%02x ",
W[i][0][x], W[i][1][x], W[i][2][x], W[i][3][x]);
}
mvOsPrintf("\n");
}
}
#endif /* MV_AES_DEBUG */
switch (keyLen)
{
case 128:
rounds = 10;
KC = 4;
break;
case 192:
rounds = 12;
KC = 6;
break;
case 256:
rounds = 14;
KC = 8;
break;
default :
return (-1);
}
for(i=0; i<MAXBC; i++)
{
for(j=0; j<4; j++)
{
expandedKey[i*4+j] = W[rounds][j][i];
}
}
for(; i<KC; i++)
{
for(j=0; j<4; j++)
{
expandedKey[i*4+j] = W[rounds-1][j][i+MAXBC-KC];
}
}
return 0;
}
int aesBlockEncrypt128(MV_U8 mode, MV_U8 *IV, MV_U8 *expandedKey, int keyLen,
MV_U32 *plain, int numBlocks, MV_U32 *cipher)
{
int i, j, t;
MV_U8 block[4][MAXBC];
int rounds;
char *input, *outBuffer;
input = (char*)plain;
outBuffer = (char*)cipher;
/* check parameter consistency: */
if( (expandedKey == NULL) || ((keyLen != 128) && (keyLen != 192) && (keyLen != 256)))
{
return AES_BAD_KEY_MAT;
}
if ((mode != MODE_ECB && mode != MODE_CBC))
{
return AES_BAD_CIPHER_STATE;
}
switch (keyLen)
{
case 128: rounds = 10; break;
case 192: rounds = 12; break;
case 256: rounds = 14; break;
default : return (-3); /* this cannot happen */
}
switch (mode)
{
case MODE_ECB:
for (i = 0; i < numBlocks; i++)
{
for (j = 0; j < 4; j++)
{
for(t = 0; t < 4; t++)
/* parse input stream into rectangular array */
block[t][j] = input[16*i+4*j+t] & 0xFF;
}
rijndaelEncrypt128(block, (MV_U8 (*)[4][MAXBC])expandedKey, rounds);
for (j = 0; j < 4; j++)
{
/* parse rectangular array into output ciphertext bytes */
for(t = 0; t < 4; t++)
outBuffer[16*i+4*j+t] = (MV_U8) block[t][j];
}
}
break;
case MODE_CBC:
for (j = 0; j < 4; j++)
{
for(t = 0; t < 4; t++)
/* parse initial value into rectangular array */
block[t][j] = IV[t+4*j] & 0xFF;
}
for (i = 0; i < numBlocks; i++)
{
for (j = 0; j < 4; j++)
{
for(t = 0; t < 4; t++)
/* parse input stream into rectangular array and exor with
IV or the previous ciphertext */
block[t][j] ^= input[16*i+4*j+t] & 0xFF;
}
rijndaelEncrypt128(block, (MV_U8 (*)[4][MAXBC])expandedKey, rounds);
for (j = 0; j < 4; j++)
{
/* parse rectangular array into output ciphertext bytes */
for(t = 0; t < 4; t++)
outBuffer[16*i+4*j+t] = (MV_U8) block[t][j];
}
}
break;
default: return AES_BAD_CIPHER_STATE;
}
return 0;
}
int aesBlockDecrypt128(MV_U8 mode, MV_U8 *IV, MV_U8 *expandedKey, int keyLen,
MV_U32 *srcData, int numBlocks, MV_U32 *dstData)
{
int i, j, t;
MV_U8 block[4][MAXBC];
MV_U8 iv[4][MAXBC];
int rounds;
char *input, *outBuffer;
input = (char*)srcData;
outBuffer = (char*)dstData;
if (expandedKey == NULL)
{
return AES_BAD_KEY_MAT;
}
/* check parameter consistency: */
if (keyLen != 128 && keyLen != 192 && keyLen != 256)
{
return AES_BAD_KEY_MAT;
}
if ((mode != MODE_ECB && mode != MODE_CBC))
{
return AES_BAD_CIPHER_STATE;
}
switch (keyLen)
{
case 128: rounds = 10; break;
case 192: rounds = 12; break;
case 256: rounds = 14; break;
default : return (-3); /* this cannot happen */
}
switch (mode)
{
case MODE_ECB:
for (i = 0; i < numBlocks; i++)
{
for (j = 0; j < 4; j++)
{
for(t = 0; t < 4; t++)
{
/* parse input stream into rectangular array */
block[t][j] = input[16*i+4*j+t] & 0xFF;
}
}
rijndaelDecrypt128(block, (MV_U8 (*)[4][MAXBC])expandedKey, rounds);
for (j = 0; j < 4; j++)
{
/* parse rectangular array into output ciphertext bytes */
for(t = 0; t < 4; t++)
outBuffer[16*i+4*j+t] = (MV_U8) block[t][j];
}
}
break;
case MODE_CBC:
/* first block */
for (j = 0; j < 4; j++)
{
for(t = 0; t < 4; t++)
{
/* parse input stream into rectangular array */
block[t][j] = input[4*j+t] & 0xFF;
iv[t][j] = block[t][j];
}
}
rijndaelDecrypt128(block, (MV_U8 (*)[4][MAXBC])expandedKey, rounds);
for (j = 0; j < 4; j++)
{
/* exor the IV and parse rectangular array into output ciphertext bytes */
for(t = 0; t < 4; t++)
{
outBuffer[4*j+t] = (MV_U8) (block[t][j] ^ IV[t+4*j]);
IV[t+4*j] = iv[t][j];
}
}
/* next blocks */
for (i = 1; i < numBlocks; i++)
{
for (j = 0; j < 4; j++)
{
for(t = 0; t < 4; t++)
{
/* parse input stream into rectangular array */
iv[t][j] = input[16*i+4*j+t] & 0xFF;
block[t][j] = iv[t][j];
}
}
rijndaelDecrypt128(block, (MV_U8 (*)[4][MAXBC])expandedKey, rounds);
for (j = 0; j < 4; j++)
{
/* exor previous ciphertext block and parse rectangular array
into output ciphertext bytes */
for(t = 0; t < 4; t++)
{
outBuffer[16*i+4*j+t] = (MV_U8) (block[t][j] ^ IV[t+4*j]);
IV[t+4*j] = iv[t][j];
}
}
}
break;
default: return AES_BAD_CIPHER_STATE;
}
return 0;
}
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