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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_sym.c
*
* This file implements Symmetric Cipher functions of the FSL SHW API for
* Sahara. This does not include CCM.
*/
#include "sahara.h"
#include "fsl_platform.h"
#include "sf_util.h"
#include "adaptor.h"
#ifdef LINUX_KERNEL
EXPORT_SYMBOL(fsl_shw_symmetric_encrypt);
EXPORT_SYMBOL(fsl_shw_symmetric_decrypt);
#endif
#if defined(NEED_CTR_WORKAROUND)
/* CTR mode needs block-multiple data in/out */
#define LENGTH_PATCH (sym_ctx->block_size_bytes)
#define LENGTH_PATCH_MASK (sym_ctx->block_size_bytes-1)
#else
#define LENGTH_PATCH 0
#define LENGTH_PATCH_MASK 0 /* du not use! */
#endif
/*!
* Block of zeroes which is maximum Symmetric block size, used for
* initializing context register, etc.
*/
static uint32_t block_zeros[4] = {
0, 0, 0, 0
};
typedef enum cipher_direction {
SYM_DECRYPT,
SYM_ENCRYPT
} cipher_direction_t;
/*!
* 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;
}
/* REQ-S2LRD-PINTFC-API-BASIC-SYM-002 */
/* PINTFC-API-BASIC-SYM-ARC4-001 */
/* PINTFC-API-BASIC-SYM-ARC4-002 */
/*!
* Compute symmetric encryption
*
*
* @param user_ctx
* @param key_info
* @param sym_ctx
* @param length
* @param pt
* @param ct
*
* @return A return code of type #fsl_shw_return_t.
*/
fsl_shw_return_t fsl_shw_symmetric_encrypt(fsl_shw_uco_t * user_ctx,
fsl_shw_sko_t * key_info,
fsl_shw_scco_t * sym_ctx,
uint32_t length,
const uint8_t * pt, uint8_t * ct)
{
fsl_shw_return_t ret;
ret = do_symmetric(user_ctx, key_info, sym_ctx, SYM_ENCRYPT,
length, pt, ct);
return ret;
}
/* PINTFC-API-BASIC-SYM-002 */
/* PINTFC-API-BASIC-SYM-ARC4-001 */
/* PINTFC-API-BASIC-SYM-ARC4-002 */
/*!
* Compute symmetric decryption
*
*
* @param user_ctx
* @param key_info
* @param sym_ctx
* @param length
* @param pt
* @param ct
*
* @return A return code of type #fsl_shw_return_t.
*/
fsl_shw_return_t fsl_shw_symmetric_decrypt(fsl_shw_uco_t * user_ctx,
fsl_shw_sko_t * key_info,
fsl_shw_scco_t * sym_ctx,
uint32_t length,
const uint8_t * ct, uint8_t * pt)
{
fsl_shw_return_t ret;
ret = do_symmetric(user_ctx, key_info, sym_ctx, SYM_DECRYPT,
length, ct, pt);
return ret;
}
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