/*!
* Add descriptor where link1 is input buffer, link2 is output buffer.
*
* @param header The Sahara header value for the descriptor.
* @param in The input buffer
* @param in_length Size of the input buffer
* @param[out] out The output buffer
* @param out_length Size of the output buffer
* @param mu Memory functions
* @param[in,out] desc_chain Chain to start or append to
*
* @return A return code of type #fsl_shw_return_t.
*/
fsl_shw_return_t add_in_out_desc(uint32_t header,
const uint8_t * in, uint32_t in_length,
uint8_t * out, uint32_t out_length,
const sah_Mem_Util * mu,
sah_Head_Desc ** desc_chain)
{
fsl_shw_return_t status = FSL_RETURN_OK_S;
sah_Link *link1 = NULL;
sah_Link *link2 = NULL;
if (in != NULL) {
status = sah_Create_Link(mu, &link1,
(sah_Oct_Str) in, in_length,
SAH_USES_LINK_DATA);
}
if ((status == FSL_RETURN_OK_S) && (out != NULL)) {
status = sah_Create_Link(mu, &link2,
(sah_Oct_Str) out, out_length,
SAH_OUTPUT_LINK | SAH_USES_LINK_DATA);
}
if (status != FSL_RETURN_OK_S) {
if (link1 != NULL) {
sah_Destroy_Link(mu, link1);
}
if (link2 != NULL) {
sah_Destroy_Link(mu, link2);
}
} else {
status = sah_Append_Desc(mu, desc_chain, header, link1, link2);
}
return status;
}
/*
* Insert descriptors to calculate ICV = HMAC(key=T, data=LEN|ALG|KEY')
*
* @param user_ctx User's context for this operation
* @param desc_chain Descriptor chain to append to
* @param t_key_info T's key object
* @param black_key Beginning of Black Key region
* @param key_length Number of bytes of key' there are in @c black_key
* @param[out] hmac Location to store ICV. Will be tagged "USES" so
* sf routines will not try to free it.
*
* @return A return code of type #fsl_shw_return_t.
*/
static inline fsl_shw_return_t create_icv_calc(fsl_shw_uco_t * user_ctx,
sah_Head_Desc ** desc_chain,
fsl_shw_sko_t * t_key_info,
const uint8_t * black_key,
uint32_t key_length,
uint8_t * hmac)
{
fsl_shw_return_t sah_code;
uint32_t header;
/* Load up T as key for the HMAC */
header = (SAH_HDR_MDHA_SET_MODE_MD_KEY /* #6 */
^ insert_mdha_algorithm_sha1
^ insert_mdha_init ^ insert_mdha_hmac ^ insert_mdha_pdata
^ insert_mdha_mac_full);
sah_code = add_in_key_desc(header, NULL, 0, t_key_info, /* Reference T in RED */
user_ctx->mem_util, desc_chain);
/* Previous step loaded key; Now set up to hash the data */
if (sah_code == FSL_RETURN_OK_S) {
sah_Link *link1 = NULL;
sah_Link *link2 = NULL;
header = SAH_HDR_MDHA_HASH; /* #10 */
/* Input - start with ownerid */
sah_code = sah_Create_Link(user_ctx->mem_util, &link1,
(void *)&t_key_info->userid,
sizeof(t_key_info->userid),
SAH_USES_LINK_DATA);
if (sah_code == FSL_RETURN_OK_S) {
/* Still input - Append black-key fields len, alg, key' */
sah_code = sah_Append_Link(user_ctx->mem_util, link1,
(void *)black_key +
LENGTH_OFFSET,
(LENGTH_LENGTH +
ALGORITHM_LENGTH +
key_length),
SAH_USES_LINK_DATA);
if (sah_code != FSL_RETURN_OK_S) {
link1 = NULL;
} else {
/* Output - computed ICV/HMAC */
sah_code =
sah_Create_Link(user_ctx->mem_util, &link2,
hmac, ICV_LENGTH,
SAH_USES_LINK_DATA |
SAH_OUTPUT_LINK);
}
sah_code =
sah_Append_Desc(user_ctx->mem_util, desc_chain,
header, link1, link2);
}
}
return sah_code;
} /* create_icv_calc */
/*!
* Add descriptor where both links are inputs, the second one being a key.
*
* @param header The Sahara header value for the descriptor.
* @param in1 The first input buffer (or NULL)
* @param in1_length Size of @a in1
* @param[out] in2 The second input buffer (or NULL)
* @param in2_length Size of @a in2
* @param mu Memory functions
* @param[in,out] desc_chain Chain to start or append to
*
* @return A return code of type #fsl_shw_return_t.
*/
fsl_shw_return_t add_in_key_desc(uint32_t header,
const uint8_t * in1,
uint32_t in1_length,
fsl_shw_sko_t * key_info,
const sah_Mem_Util * mu,
sah_Head_Desc ** desc_chain)
{
fsl_shw_return_t status = FSL_RETURN_OK_S;
sah_Link *link1 = NULL;
sah_Link *link2 = NULL;
if (in1 != NULL) {
status = sah_Create_Link(mu, &link1,
(sah_Oct_Str) in1, in1_length,
SAH_USES_LINK_DATA);
}
if (status == FSL_RETURN_OK_S) {
status = sah_Create_Key_Link(mu, &link2, key_info);
}
if (status != FSL_RETURN_OK_S) {
if (link1 != NULL) {
sah_Destroy_Link(mu, link1);
}
if (link2 != NULL) {
sah_Destroy_Link(mu, link2);
}
} else {
status = sah_Append_Desc(mu, desc_chain, header, link1, link2);
}
return status;
}
/**
* Append Link
*
* @brief Allocate Memory for Link structure and append it to the end of
* the link chain.
*
* @post On allocation failure, @a p will be freed if #SAH_OWNS_LINK_DATA is
* p set in @a flags.
*
* @param mu Memory functions
* @param link_head Pointer to (head of) existing link chain
* @param p Pointer to data to use in link
* @param length Length of buffer 'p' in bytes
* @param flags Indicates whether memory has been allocated by the calling
* function or the security function
*
* @return A return code of type #fsl_shw_return_t.
*/
fsl_shw_return_t sah_Append_Link(
const sah_Mem_Util *mu,
sah_Link *link_head,
uint8_t *p,
const size_t length,
const sah_Link_Flags flags)
{
sah_Link* new_link;
fsl_shw_return_t status;
status = sah_Create_Link(mu, &new_link, p, length, flags);
if (status == FSL_RETURN_OK_S) {
/* chase for the tail */
while (link_head->next != NULL) {
link_head = link_head->next;
}
/* and add new tail */
link_head->next = new_link;
}
return status;
}
/*!
* Add a Descriptor which will process with CBC the NIST preamble data
*
* @param desc_chain Current chain
* @param user_ctx User's context
* @param auth_ctx Inf
* @param auth_data Additional auth data for this call
* @param auth_data_length Length in bytes of @a auth_data
*
* @return A return code of type #fsl_shw_return_t.
*/
static inline fsl_shw_return_t add_assoc_preamble(sah_Head_Desc ** desc_chain,
fsl_shw_uco_t * user_ctx,
fsl_shw_acco_t * auth_ctx,
const uint8_t * auth_data,
uint32_t auth_data_length)
{
uint8_t *temp_buf;
sah_Link *link1 = NULL;
sah_Link *link2 = NULL;
fsl_shw_return_t status = FSL_RETURN_OK_S;
uint32_t cbc_data_length = 0;
/* Assume AES */
uint32_t header = SAH_HDR_SKHA_ENC_DEC;
/* Grab a block big enough for multiple uses so that only one allocate
* request needs to be made.
*/
temp_buf =
user_ctx->mem_util->mu_malloc(user_ctx->mem_util->mu_ref,
3 *
auth_ctx->auth_info.CCM_ctx_info.
block_size_bytes);
if (temp_buf == NULL) {
status = FSL_RETURN_NO_RESOURCE_S;
} else {
uint32_t temp_buf_flag;
if (auth_ctx->flags & FSL_ACCO_NIST_CCM) {
status = process_assoc_from_nist_params(&link1,
&cbc_data_length,
user_ctx,
auth_ctx,
auth_data,
auth_data_length,
&temp_buf);
/* temp_buf has been referenced (and incremented). Only 'own' it
* once, at its first value. Since the nist routine called above
* bumps it...
*/
temp_buf_flag = SAH_USES_LINK_DATA;
} else { /* if NIST */
if (status == FSL_RETURN_OK_S) {
status =
sah_Create_Link(user_ctx->mem_util, &link1,
(uint8_t *) auth_data,
auth_data_length,
SAH_USES_LINK_DATA);
/* for next/first use of temp_buf */
temp_buf_flag = SAH_OWNS_LINK_DATA;
}
cbc_data_length = auth_data_length;
} /* else not NIST */
/*
* Auth data links have been created. Now create link for the
* useless output of the CBC calculation.
*/
if (status == FSL_RETURN_OK_S) {
status = sah_Create_Link(user_ctx->mem_util, &link2,
temp_buf,
auth_ctx->auth_info.
CCM_ctx_info.block_size_bytes,
temp_buf_flag |
SAH_OUTPUT_LINK);
}
temp_buf += auth_ctx->auth_info.CCM_ctx_info.block_size_bytes;
cbc_data_length -=
auth_ctx->auth_info.CCM_ctx_info.block_size_bytes;
if (cbc_data_length != 0) {
while ((status == FSL_RETURN_OK_S)
&& (cbc_data_length != 0)) {
uint32_t linklen =
(cbc_data_length >
CBC_BUF_LEN) ? CBC_BUF_LEN :
cbc_data_length;
status =
sah_Append_Link(user_ctx->mem_util, link2,
cbc_buffer, linklen,
SAH_USES_LINK_DATA |
SAH_OUTPUT_LINK);
cbc_data_length -= linklen;
}
}
if (status != FSL_RETURN_OK_S) {
if (link1 != NULL) {
sah_Destroy_Link(user_ctx->mem_util, link1);
}
if (link2 != NULL) {
sah_Destroy_Link(user_ctx->mem_util, link2);
}
} else {
/* Header to set up crank through auth data */
status = sah_Append_Desc(user_ctx->mem_util, desc_chain,
header, link1, link2);
}
}
return status;
}
/*!
* Append a descriptor chain which will compute CBC over the
* formatted associated data blocks.
*
* @param[in,out] link1 Where to append the new link
* @param[in,out] data_len Location of current/updated auth-only data length
* @param user_ctx Info for acquiring memory
* @param auth_ctx Location of block0 value
* @param auth_data Unformatted associated data
* @param auth_data_length Length in octets of @a auth_data
* @param[in,out] temp_buf Location of in-process data.
*
* @return A return code of type #fsl_shw_return_t.
*/
static inline fsl_shw_return_t process_assoc_from_nist_params(sah_Link ** link1,
uint32_t *
data_len,
fsl_shw_uco_t *
user_ctx,
fsl_shw_acco_t *
auth_ctx,
const uint8_t *
auth_data,
uint32_t
auth_data_length,
uint8_t **
temp_buf)
{
fsl_shw_return_t status;
uint32_t auth_size_length =
COMPUTE_NIST_AUTH_LEN_SIZE(auth_data_length);
uint32_t auth_pad_length =
auth_ctx->auth_info.CCM_ctx_info.block_size_bytes -
(auth_data_length +
auth_size_length) %
auth_ctx->auth_info.CCM_ctx_info.block_size_bytes;
if (auth_pad_length ==
auth_ctx->auth_info.CCM_ctx_info.block_size_bytes) {
auth_pad_length = 0;
}
/* Put in Block0 */
status = sah_Create_Link(user_ctx->mem_util, link1,
auth_ctx->auth_info.CCM_ctx_info.context,
auth_ctx->auth_info.CCM_ctx_info.
block_size_bytes, SAH_USES_LINK_DATA);
if (status == FSL_RETURN_OK_S) {
/* Add on length preamble to auth data */
STORE_NIST_AUTH_LEN(auth_data_length, *temp_buf);
status = sah_Append_Link(user_ctx->mem_util, *link1,
*temp_buf, auth_size_length,
SAH_OWNS_LINK_DATA);
*temp_buf += auth_size_length; /* 2, 6, or 10 bytes */
}
if (status == FSL_RETURN_OK_S) {
/* Add in auth data */
status = sah_Append_Link(user_ctx->mem_util, *link1,
(uint8_t *) auth_data,
auth_data_length, SAH_USES_LINK_DATA);
}
if ((status == FSL_RETURN_OK_S) && (auth_pad_length > 0)) {
status = sah_Append_Link(user_ctx->mem_util, *link1,
block_zeros, auth_pad_length,
SAH_USES_LINK_DATA);
}
*data_len = auth_ctx->auth_info.CCM_ctx_info.block_size_bytes +
auth_data_length + auth_size_length + auth_pad_length;
return status;
}
/*!
* 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)
{
SAH_SF_DCLS;
uint8_t *sink = NULL;
sah_Link *link1 = NULL;
sah_Link *link2 = NULL;
sah_Oct_Str ptr1;
uint32_t size1 = sym_ctx->block_size_bytes;
SAH_SF_USER_CHECK();
/* 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
^ sah_insert_skha_algorithm_arc4;
DESC_IN_KEY(header, 0, NULL, key_info);
} else { /* load SBox */
/* Desc. #33 w/ARC4 and NO PERMUTE */
header = SAH_HDR_ARC4_SET_MODE_SBOX
^ sah_insert_skha_no_permute
^ sah_insert_skha_algorithm_arc4;
DESC_IN_IN(header, 256, sym_ctx->context,
3, sym_ctx->context + 256);
} /* load SBox */
/* Add in-out data descriptor to process the data */
if (length != 0) {
DESC_IN_OUT(SAH_HDR_SKHA_ENC_DEC, length, in, length,
out);
}
/* 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;
DESC_OUT_OUT(header, 256, sym_ctx->context,
3, sym_ctx->context + 256);
}
} else { /* not ARC4 */
/* Doing 1- or 2- descriptor chain. */
/* Desc. #1 and algorithm and mode */
header = SAH_HDR_SKHA_SET_MODE_IV_KEY
^ sah_insert_skha_mode[sym_ctx->mode]
^ sah_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 ^= sah_insert_skha_no_key_parity;
}
/* Header by default is decrypting, so... */
if (encrypt == SYM_ENCRYPT) {
header ^= sah_insert_skha_encrypt;
}
if (sym_ctx->mode == FSL_SYM_MODE_CTR) {
header ^= sah_insert_skha_modulus[sym_ctx->modulus_exp];
}
if (sym_ctx->mode == FSL_SYM_MODE_ECB) {
ptr1 = NULL;
size1 = 0;
} else if (sym_ctx->flags & FSL_SYM_CTX_INIT) {
ptr1 = (uint8_t *) block_zeros;
} else {
ptr1 = sym_ctx->context;
}
DESC_IN_KEY(header, sym_ctx->block_size_bytes, ptr1, key_info);
/* Add in-out data descriptor */
if (length != 0) {
header = SAH_HDR_SKHA_ENC_DEC;
if (LENGTH_PATCH && (sym_ctx->mode == FSL_SYM_MODE_CTR)
&& ((length & LENGTH_PATCH_MASK) != 0)) {
sink = DESC_TEMP_ALLOC(LENGTH_PATCH);
ret =
sah_Create_Link(user_ctx->mem_util, &link1,
(uint8_t *) in, length,
SAH_USES_LINK_DATA);
ret =
sah_Append_Link(user_ctx->mem_util, link1,
(uint8_t *) sink,
LENGTH_PATCH -
(length &
LENGTH_PATCH_MASK),
SAH_USES_LINK_DATA);
if (ret != FSL_RETURN_OK_S) {
goto out;
}
ret =
sah_Create_Link(user_ctx->mem_util, &link2,
out, length,
SAH_USES_LINK_DATA |
SAH_OUTPUT_LINK);
if (ret != FSL_RETURN_OK_S) {
goto out;
}
ret = sah_Append_Link(user_ctx->mem_util, link2,
sink,
LENGTH_PATCH -
(length &
LENGTH_PATCH_MASK),
SAH_USES_LINK_DATA);
if (ret != FSL_RETURN_OK_S) {
goto out;
}
ret =
sah_Append_Desc(user_ctx->mem_util,
&desc_chain, header, link1,
link2);
if (ret != FSL_RETURN_OK_S) {
goto out;
}
link1 = link2 = NULL;
} else {
DESC_IN_OUT(header, length, in, length, out);
}
}
/* Unload any desired context */
if (sym_ctx->flags & FSL_SYM_CTX_SAVE) {
DESC_OUT_OUT(SAH_HDR_SKHA_READ_CONTEXT_IV, 0, NULL,
sym_ctx->block_size_bytes,
sym_ctx->context);
}
} /* not ARC4 */
SAH_SF_EXECUTE();
out:
SAH_SF_DESC_CLEAN();
DESC_TEMP_FREE(sink);
if (LENGTH_PATCH) {
sah_Destroy_Link(user_ctx->mem_util, link1);
sah_Destroy_Link(user_ctx->mem_util, link2);
}
return ret;
}
