/*!
* Create and run the chain for a symmetric-key operation.
*
* @param user_ctx Who the user is
* @param key_info What key is to be used
* @param sym_ctx Info details about algorithm
* @param encrypt 0 = decrypt, non-zero = encrypt
* @param length Number of octets at @a in and @a out
* @param in Pointer to input data
* @param out Location to store output data
*
* @return The status of handing chain to driver,
* or an earlier argument/flag or allocation
* error.
*/
static fsl_shw_return_t do_symmetric(fsl_shw_uco_t * user_ctx,
fsl_shw_sko_t * key_info,
fsl_shw_scco_t * sym_ctx,
cipher_direction_t encrypt,
uint32_t length,
const uint8_t * in, uint8_t * out)
{
fsl_shw_return_t status = FSL_RETURN_ERROR_S;
uint32_t header;
sah_Head_Desc *desc_chain = NULL;
sah_Oct_Str ptr1;
/* Two different sets of chains, depending on algorithm */
if (key_info->algorithm == FSL_KEY_ALG_ARC4) {
if (sym_ctx->flags & FSL_SYM_CTX_INIT) {
/* Desc. #35 w/ARC4 - start from key */
header = SAH_HDR_ARC4_SET_MODE_KEY
^ insert_skha_algorithm_arc4;
status = add_in_key_desc(header, NULL, 0, key_info,
user_ctx->mem_util,
&desc_chain);
} else { /* load SBox */
/* Desc. #33 w/ARC4 and NO PERMUTE */
header = SAH_HDR_ARC4_SET_MODE_SBOX
^ insert_skha_no_permute
^ insert_skha_algorithm_arc4;
status = add_two_in_desc(header, sym_ctx->context, 256,
sym_ctx->context + 256, 3,
user_ctx->mem_util,
&desc_chain);
} /* load SBox */
/* Add in-out data descriptor */
if ((status == FSL_RETURN_OK_S) && (length != 0)) {
status = add_in_out_desc(SAH_HDR_SKHA_ENC_DEC,
in, length, out, length,
user_ctx->mem_util,
&desc_chain);
}
/* Operation is done ... save what came out? */
if (sym_ctx->flags & FSL_SYM_CTX_SAVE) {
/* Desc. #34 - Read SBox, pointers */
header = SAH_HDR_ARC4_READ_SBOX;
if (status == FSL_RETURN_OK_S) {
status =
add_two_out_desc(header, sym_ctx->context,
256,
sym_ctx->context + 256, 3,
user_ctx->mem_util,
&desc_chain);
}
}
} else { /* not ARC4 */
/* Doing 1- or 2- descriptor chain. */
/* Desc. #1 and algorithm and mode */
header = SAH_HDR_SKHA_SET_MODE_IV_KEY
^ insert_skha_mode[sym_ctx->mode]
^ insert_skha_algorithm[key_info->algorithm];
/* Honor 'no key parity checking' for DES and TDES */
if ((key_info->flags & FSL_SKO_KEY_IGNORE_PARITY) &&
((key_info->algorithm == FSL_KEY_ALG_DES) ||
(key_info->algorithm == FSL_KEY_ALG_TDES))) {
header ^= insert_skha_no_key_parity;
}
/* Header by default is decrypting, so... */
if (encrypt == SYM_ENCRYPT) {
header ^= insert_skha_encrypt;
}
if (sym_ctx->mode == FSL_SYM_MODE_CTR) {
header ^= insert_skha_modulus[sym_ctx->modulus_exp];
}
if ((sym_ctx->mode == FSL_SYM_MODE_ECB)
|| (sym_ctx->flags & FSL_SYM_CTX_INIT)) {
ptr1 = block_zeros;
} else {
ptr1 = sym_ctx->context;
}
status =
add_in_key_desc(header, ptr1, sym_ctx->block_size_bytes,
key_info, user_ctx->mem_util, &desc_chain);
/* Add in-out data descriptor */
if ((length != 0) && (status == FSL_RETURN_OK_S)) {
status =
add_in_out_desc(SAH_HDR_SKHA_ENC_DEC, in, length,
out, length, user_ctx->mem_util,
&desc_chain);
}
/* Unload any desired context */
if ((sym_ctx->flags & FSL_SYM_CTX_SAVE) &&
(status == FSL_RETURN_OK_S)) {
status = add_two_out_desc(SAH_HDR_SKHA_READ_CONTEXT_IV,
NULL, 0, sym_ctx->context,
sym_ctx->block_size_bytes,
user_ctx->mem_util,
&desc_chain);
}
} /* not ARC4 */
if (status != FSL_RETURN_OK_S) {
/* Delete possibly-started chain */
sah_Descriptor_Chain_Destroy(user_ctx->mem_util, &desc_chain);
} else {
status = sah_Descriptor_Chain_Execute(desc_chain, user_ctx);
}
return status;
}
/*!
* Get the hmac
*
*
* @param user_ctx Info for acquiring memory
* @param key_info
* @param hmac_ctx
* @param msg
* @param length
* @param result
* @param result_len
*
* @return A return code of type #fsl_shw_return_t.
*/
fsl_shw_return_t fsl_shw_hmac(
fsl_shw_uco_t* user_ctx,
fsl_shw_sko_t* key_info,
fsl_shw_hmco_t* hmac_ctx,
const uint8_t* msg,
uint32_t length,
uint8_t* result,
uint32_t result_len)
{
fsl_shw_return_t ret;
sah_Head_Desc* desc_chain = NULL;
uint32_t header;
/* perform sanity check on uco */
ret = sah_validate_uco(user_ctx);
/* check flag consistency */
/* Note that Final, Init, and Save are an illegal combination when a key
* is being used. Because of the logic flow of this routine, that is
* taken care of without being explict */
if (ret == FSL_RETURN_OK_S) {
if (
/* nothing to work on */
(((hmac_ctx->flags & FSL_HMAC_FLAGS_INIT) == 0) &&
((hmac_ctx->flags & FSL_HMAC_FLAGS_LOAD) == 0)) ||
/* can't do both */
((hmac_ctx->flags & FSL_HMAC_FLAGS_INIT) &&
(hmac_ctx->flags & FSL_HMAC_FLAGS_LOAD)) ||
/* must be some output */
(((hmac_ctx->flags & FSL_HMAC_FLAGS_SAVE) == 0) &&
((hmac_ctx->flags & FSL_HMAC_FLAGS_FINALIZE) == 0))) {
ret = FSL_RETURN_BAD_FLAG_S;
}
}
/* build descriptor #6 */
if (ret == FSL_RETURN_OK_S) {
/* start building descriptor header */
header = SAH_HDR_MDHA_SET_MODE_MD_KEY ^
insert_mdha_algorithm[hmac_ctx->algorithm] ^
insert_mdha_init;
/* if this is to finalize the digest, mark to pad last block */
if (hmac_ctx->flags & FSL_HMAC_FLAGS_FINALIZE) {
header ^= insert_mdha_pdata;
}
/*** Check if this is a one shot ***/
if ((hmac_ctx->flags & FSL_HMAC_FLAGS_INIT) &&
(hmac_ctx->flags & FSL_HMAC_FLAGS_FINALIZE)) {
header ^= insert_mdha_hmac;
/*** See if this uses Precomputes ***/
if (hmac_ctx->flags & FSL_HMAC_FLAGS_PRECOMPUTES_PRESENT) {
ret = add_two_in_desc(header,
(uint8_t *)hmac_ctx->inner_precompute,
hmac_ctx->context_register_length,
(uint8_t *)hmac_ctx->outer_precompute,
hmac_ctx->context_length,
user_ctx->mem_util,
&desc_chain);
} else { /*** Precomputes not requested, try using Key ***/
if (key_info->key != NULL) {
/* first, validate the key fields and related flag */
if (key_info->key_length == 0) {
ret = FSL_RETURN_BAD_KEY_LENGTH_S;
} else {
if ((key_info->algorithm != FSL_KEY_ALG_HMAC) ||
(key_info->key_length > 64)) {
ret = FSL_RETURN_BAD_ALGORITHM_S;
}
}
if (ret == FSL_RETURN_OK_S) {
/* finish building descriptor header (Key specific) */
header ^= insert_mdha_mac_full;
ret = add_in_key_desc(header, NULL, 0, key_info,
user_ctx->mem_util, &desc_chain);
}
} else { /*** not using Key or Precomputes, so die ***/
ret = FSL_RETURN_BAD_FLAG_S;
}
}
} else { /*** it's not a one shot, must be multi-step ***/
/* this the last chunk? */
if (hmac_ctx->flags & FSL_HMAC_FLAGS_FINALIZE) {
header ^= insert_mdha_hmac;
ret = add_two_in_desc(header,
(uint8_t *)hmac_ctx->ongoing_context,
hmac_ctx->context_register_length,
(uint8_t *)hmac_ctx->outer_precompute,
hmac_ctx->context_length,
user_ctx->mem_util, &desc_chain);
} else { /* not last chunk */
uint8_t *ptr1;
if (hmac_ctx->flags & FSL_HMAC_FLAGS_INIT) {
/* must be using precomputes, cannot 'chunk' message
* starting with a key */
if (hmac_ctx->flags & FSL_HMAC_FLAGS_PRECOMPUTES_PRESENT) {
ptr1 = (uint8_t *)hmac_ctx->inner_precompute;
} else {
ret = FSL_RETURN_NO_RESOURCE_S;
}
} else {
ptr1 = (uint8_t *)hmac_ctx->ongoing_context;
}
if (ret == FSL_RETURN_OK_S) {
ret = add_two_in_desc(header, ptr1,
hmac_ctx->context_register_length,
NULL, 0, user_ctx->mem_util,
&desc_chain);
}
}
}
} /* end of building descriptor #6 */
/*** build descriptor #10 & maybe 11 ***/
if (ret == FSL_RETURN_OK_S) {
header = SAH_HDR_MDHA_HASH;
if (hmac_ctx->flags & FSL_HMAC_FLAGS_FINALIZE) {
/* check that the results parameters seem reasonable */
if ((result_len != 0) && (result != NULL)) {
if (result_len > hmac_ctx->context_register_length) {
result_len = hmac_ctx->context_register_length;
}
/* message in / digest out (descriptor #10) */
ret = add_in_out_desc(header, msg, length, result, result_len,
user_ctx->mem_util, &desc_chain);
/*** see if descriptor #11 needs to be built ***/
if ((hmac_ctx->flags & FSL_HMAC_FLAGS_SAVE) &&
(ret == FSL_RETURN_OK_S)) {
header = SAH_HDR_MDHA_STORE_DIGEST;
/* nothing in / context out */
ret = add_two_in_desc(header, NULL, 0,
(uint8_t *)hmac_ctx->ongoing_context,
hmac_ctx->context_register_length,
user_ctx->mem_util, &desc_chain);
}
} else {
/* something wrong with result or its length */
ret = FSL_RETURN_BAD_DATA_LENGTH_S;
}
} else { /* finalize not set, so store in ongoing context field */
if ((length % 64) == 0) {
/* message in / context out */
ret = add_in_out_desc(header, msg, length,
(uint8_t *)hmac_ctx->ongoing_context,
hmac_ctx->context_register_length,
user_ctx->mem_util, &desc_chain);
} else {
ret = FSL_RETURN_BAD_DATA_LENGTH_S;
}
}
}
/* Pass the chain to the driver. */
if (ret == FSL_RETURN_OK_S) {
ret = sah_Descriptor_Chain_Execute(desc_chain, user_ctx);
} else {
if (desc_chain != NULL) {
/* ignore the destroy function's return value, the destroy
* function's return value is not what went wroung with this
* routine */
sah_Descriptor_Chain_Destroy(user_ctx->mem_util, &desc_chain);
}
}
return ret;
}
