void ltc_init(void)
{
int cipherID;
unsigned char key[ENCRYPTION_KEY_LENGTH];
#if defined(ENCRYPTION_CTR) || defined(ENCRYPTION_CBC)
unsigned char IV[ENCRYPTION_BLOCK_LENGTH];
#endif
TRACE_DEBUG("LTC: Initializing ...\n\r");
// Register cipher
register_cipher(&CIPHER_DESC);
cipherID = find_cipher(CIPHER_NAME);
// Load key
ASCII2Hex(ENCRYPTION_KEY, key, ENCRYPTION_KEY_LENGTH);
#if defined(ENCRYPTION_CTR) || defined(ENCRYPTION_CBC)
// Load IV
ASCII2Hex(ENCRYPTION_IV, IV, ENCRYPTION_BLOCK_LENGTH);
#endif
// Start decryption mode
#if defined(ENCRYPTION_ECB)
ecb_start(cipherID, key, ENCRYPTION_KEY_LENGTH, 0, &sECB);
#elif defined(ENCRYPTION_CBC)
cbc_start(cipherID, IV, key, ENCRYPTION_KEY_LENGTH, 0, &sCBC);
#elif defined(ENCRYPTION_CTR)
ctr_start(cipherID, IV, key, ENCRYPTION_KEY_LENGTH, 0, CTR_COUNTER_BIG_ENDIAN, &sCTR);
#endif
TRACE_DEBUG("LTC: Initialization done.\n\r");
}
C4Err ECB_Encrypt(Cipher_Algorithm algorithm,
const void * key,
const void * in,
size_t bytesIn,
void * out )
{
int err = kC4Err_NoErr;
int status = CRYPT_OK;
symmetric_ECB ECB;
int keylen = 0;
int cipher = -1;
switch(algorithm)
{
case kCipher_Algorithm_AES128:
keylen = 128 >> 3;
cipher = find_cipher("aes");
break;
case kCipher_Algorithm_AES192:
keylen = 192 >> 3;
cipher = find_cipher("aes");
break;
case kCipher_Algorithm_AES256:
keylen = 256 >> 3;
cipher = find_cipher("aes");
break;
case kCipher_Algorithm_2FISH256:
keylen = 256 >> 3;
cipher = find_cipher("twofish");
break;
default:
RETERR(kC4Err_BadCipherNumber);
}
status = ecb_start(cipher, key, keylen, 0, &ECB ); CKSTAT;
status = ecb_encrypt(in, out, bytesIn, &ECB); CKSTAT;
done:
ecb_done(&ECB);
if(status != CRYPT_OK)
err = sCrypt2C4Err(status);
return err;
}
void ltc_init_3DES_ECB(void)
{
int cipherID;
unsigned char key[ENCRYPTION_KEY_LENGTH];
TRACE_DEBUG("LTC: Initializing ECB...\n\r");
// Register cipher
register_cipher(&des3_desc);
cipherID = find_cipher("3des");
// Load key
ASCII2Hex(ENCRYPTION_KEY, key, ENCRYPTION_KEY_LENGTH);
// Start decryption mode
ecb_start(cipherID, key, ENCRYPTION_KEY_LENGTH, 0, &sECB);
TRACE_DEBUG("LTC: Initialization done.\n\r");
}
static int
EncryptECB(
int cipher,
int rounds,
int counterMode,
unsigned char *iv,
unsigned char *key,
unsigned long keyLength,
unsigned char *data,
unsigned long dataLength,
unsigned char *dest
)
{
int status;
symmetric_ECB state;
status = ecb_start(cipher, key, keyLength, rounds, &state);
if (status == CRYPT_OK) {
status = ecb_encrypt(data, dest, dataLength, &state);
ecb_done(&state);
}
return status;
}
TEE_Result tee_cipher_init3(void *ctx, uint32_t algo,
TEE_OperationMode mode, const uint8_t *key1,
size_t key1_len, const uint8_t *key2,
size_t key2_len, const uint8_t *iv, size_t iv_len)
{
TEE_Result res;
int ltc_res, ltc_cipherindex;
uint8_t *real_key, key_array[24];
size_t real_key_len;
struct symmetric_CTS *cts;
res = tee_algo_to_ltc_cipherindex(algo, <c_cipherindex);
if (res != TEE_SUCCESS)
return TEE_ERROR_NOT_SUPPORTED;
switch (algo) {
case TEE_ALG_AES_ECB_NOPAD:
case TEE_ALG_DES_ECB_NOPAD:
ltc_res = ecb_start(
ltc_cipherindex, key1, key1_len,
0, (symmetric_ECB *)ctx);
break;
case TEE_ALG_DES3_ECB_NOPAD:
/* either des3 or des2, depending on the size of the key */
get_des2_key(key1, key1_len, key_array,
&real_key, &real_key_len);
ltc_res = ecb_start(
ltc_cipherindex, real_key, real_key_len,
0, (symmetric_ECB *)ctx);
break;
case TEE_ALG_AES_CBC_NOPAD:
case TEE_ALG_DES_CBC_NOPAD:
if (iv_len !=
(size_t)cipher_descriptor[ltc_cipherindex].block_length)
return TEE_ERROR_BAD_PARAMETERS;
ltc_res = cbc_start(
ltc_cipherindex, iv, key1, key1_len,
0, (symmetric_CBC *)ctx);
break;
case TEE_ALG_DES3_CBC_NOPAD:
/* either des3 or des2, depending on the size of the key */
get_des2_key(key1, key1_len, key_array,
&real_key, &real_key_len);
if (iv_len !=
(size_t)cipher_descriptor[ltc_cipherindex].block_length)
return TEE_ERROR_BAD_PARAMETERS;
ltc_res = cbc_start(
ltc_cipherindex, iv, real_key, real_key_len,
0, (symmetric_CBC *)ctx);
break;
case TEE_ALG_AES_CTR:
if (iv_len !=
(size_t)cipher_descriptor[ltc_cipherindex].block_length)
return TEE_ERROR_BAD_PARAMETERS;
ltc_res = ctr_start(
ltc_cipherindex, iv, key1, key1_len,
0, CTR_COUNTER_BIG_ENDIAN, (symmetric_CTR *)ctx);
break;
case TEE_ALG_AES_CTS:
cts = (struct symmetric_CTS *)ctx;
res = tee_cipher_init3(
(void *)(&(cts->ecb)),
TEE_ALG_AES_ECB_NOPAD, mode,
key1, key1_len, key2, key2_len, iv, iv_len);
if (res != TEE_SUCCESS)
return res;
res = tee_cipher_init3(
(void *)(&(cts->cbc)),
TEE_ALG_AES_CBC_NOPAD, mode,
key1, key1_len, key2, key2_len, iv, iv_len);
if (res != TEE_SUCCESS)
return res;
ltc_res = CRYPT_OK;
break;
case TEE_ALG_AES_XTS:
if (key1_len != key2_len)
return TEE_ERROR_BAD_PARAMETERS;
ltc_res = xts_start(
ltc_cipherindex, key1, key2, key1_len,
0, (symmetric_xts *)ctx);
break;
default:
return TEE_ERROR_NOT_SUPPORTED;
}
if (ltc_res == CRYPT_OK)
return TEE_SUCCESS;
else
return TEE_ERROR_BAD_STATE;
}
