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/*
* Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/*!
* @file fsl_shw_hmac.c
*
* This file implements Hashed Message Authentication Code functions of the FSL
* SHW API for Sahara.
*/
#include "sahara.h"
#include "sf_util.h"
#ifdef __KERNEL__
EXPORT_SYMBOL(fsl_shw_hmac_precompute);
EXPORT_SYMBOL(fsl_shw_hmac);
#endif
/* REQ-S2LRD-PINTFC-API-BASIC-HMAC-001 */
/*!
* Get the precompute information
*
*
* @param user_ctx
* @param key_info
* @param hmac_ctx
*
* @return A return code of type #fsl_shw_return_t.
*/
fsl_shw_return_t fsl_shw_hmac_precompute(fsl_shw_uco_t * user_ctx,
fsl_shw_sko_t * key_info,
fsl_shw_hmco_t * hmac_ctx)
{
SAH_SF_DCLS;
SAH_SF_USER_CHECK();
if ((key_info->algorithm != FSL_KEY_ALG_HMAC) ||
(key_info->key_length > 64)) {
return FSL_RETURN_BAD_ALGORITHM_S;
} else if (key_info->key_length == 0) {
return FSL_RETURN_BAD_KEY_LENGTH_S;
}
/* Set up to start the Inner Calculation */
/* Desc. #8 w/IPAD, & INIT */
header = SAH_HDR_MDHA_SET_MODE_HASH
^ sah_insert_mdha_ipad
^ sah_insert_mdha_init
^ sah_insert_mdha_algorithm[hmac_ctx->algorithm];
DESC_KEY_OUT(header, key_info,
hmac_ctx->context_register_length,
(uint8_t *) hmac_ctx->inner_precompute);
/* Set up for starting Outer calculation */
/* exchange IPAD bit for OPAD bit */
header ^= (sah_insert_mdha_ipad ^ sah_insert_mdha_opad);
/* Theoretically, we can leave this link out and use the key which is
* already in the register... however, if we do, the resulting opad
* hash does not have the correct value when using the model. */
DESC_KEY_OUT(header, key_info,
hmac_ctx->context_register_length,
(uint8_t *) hmac_ctx->outer_precompute);
SAH_SF_EXECUTE();
if (ret == FSL_RETURN_OK_S) {
/* flag that precomputes have been entered in this hco
* assume it'll first be used for initilizing */
hmac_ctx->flags |= (FSL_HMAC_FLAGS_INIT |
FSL_HMAC_FLAGS_PRECOMPUTES_PRESENT);
}
out:
SAH_SF_DESC_CLEAN();
return ret;
}
/* REQ-S2LRD-PINTFC-API-BASIC-HMAC-002 */
/*!
* 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)
{
SAH_SF_DCLS;
SAH_SF_USER_CHECK();
/* 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 (
/* 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;
goto out;
}
/* build descriptor #6 */
/* start building descriptor header */
header = SAH_HDR_MDHA_SET_MODE_MD_KEY ^
sah_insert_mdha_algorithm[hmac_ctx->algorithm] ^
sah_insert_mdha_init;
/* if this is to finalize the digest, mark to pad last block */
if (hmac_ctx->flags & FSL_HMAC_FLAGS_FINALIZE) {
header ^= sah_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 ^= sah_insert_mdha_hmac;
/* See if this uses Precomputes */
if (hmac_ctx->flags & FSL_HMAC_FLAGS_PRECOMPUTES_PRESENT) {
DESC_IN_IN(header,
hmac_ctx->context_register_length,
(uint8_t *) hmac_ctx->inner_precompute,
hmac_ctx->context_length,
(uint8_t *) hmac_ctx->outer_precompute);
} 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)
|| (key_info->key_length > 64)) {
ret = FSL_RETURN_BAD_KEY_LENGTH_S;
goto out;
} else {
if (key_info->algorithm !=
FSL_KEY_ALG_HMAC) {
ret =
FSL_RETURN_BAD_ALGORITHM_S;
goto out;
}
}
/* finish building descriptor header (Key specific) */
header ^= sah_insert_mdha_mac_full;
DESC_IN_KEY(header, 0, NULL, key_info);
} else { /* not using Key or Precomputes, so die */
ret = FSL_RETURN_BAD_FLAG_S;
goto out;
}
}
} else { /* it's not a one shot, must be multi-step */
/* this the last chunk? */
if (hmac_ctx->flags & FSL_HMAC_FLAGS_FINALIZE) {
header ^= sah_insert_mdha_hmac;
DESC_IN_IN(header,
hmac_ctx->context_register_length,
(uint8_t *) hmac_ctx->ongoing_context,
hmac_ctx->context_length,
(uint8_t *) hmac_ctx->outer_precompute);
} 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;
goto out;
}
} else {
ptr1 = (uint8_t *) hmac_ctx->ongoing_context;
}
if (ret != FSL_RETURN_OK_S) {
goto out;
}
DESC_IN_IN(header,
hmac_ctx->context_register_length, ptr1,
0, NULL);
}
} /* multi-step */
/* build descriptor #10 & maybe 11 */
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) */
DESC_IN_OUT(header, length, msg, result_len, result);
/* see if descriptor #11 needs to be built */
if (hmac_ctx->flags & FSL_HMAC_FLAGS_SAVE) {
header = SAH_HDR_MDHA_STORE_DIGEST;
/* nothing in / context out */
DESC_IN_IN(header, 0, NULL,
hmac_ctx->context_register_length,
(uint8_t *) hmac_ctx->
ongoing_context);
}
} 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) { /* this will change for 384/512 support */
/* message in / context out */
DESC_IN_OUT(header, length, msg,
hmac_ctx->context_register_length,
(uint8_t *) hmac_ctx->ongoing_context);
} else {
/* not final data, and not multiple of block length */
ret = FSL_RETURN_BAD_DATA_LENGTH_S;
}
}
SAH_SF_EXECUTE();
out:
SAH_SF_DESC_CLEAN();
return ret;
} /* fsl_shw_hmac() */
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