diff options
Diffstat (limited to 'drivers/mxc/security/sahara2/fsl_shw_hash.c')
| -rw-r--r-- | drivers/mxc/security/sahara2/fsl_shw_hash.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/mxc/security/sahara2/fsl_shw_hash.c b/drivers/mxc/security/sahara2/fsl_shw_hash.c new file mode 100644 index 000000000000..7d4db53480f6 --- /dev/null +++ b/drivers/mxc/security/sahara2/fsl_shw_hash.c @@ -0,0 +1,186 @@ +/* + * 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_hash.c + * + * This file implements Cryptographic Hashing functions of the FSL SHW API + * for Sahara. This does not include HMAC. + */ + +#include "sahara.h" +#include "sf_util.h" + +#ifdef LINUX_KERNEL +EXPORT_SYMBOL(fsl_shw_hash); +#endif + +/* REQ-S2LRD-PINTFC-API-BASIC-HASH-005 */ +/*! + * Hash a stream of data with a cryptographic hash algorithm. + * + * The flags in the @a hash_ctx control the operation of this function. + * + * Hashing functions work on 64 octets of message at a time. Therefore, when + * any partial hashing of a long message is performed, the message @a length of + * each segment must be a multiple of 64. When ready to + * #FSL_HASH_FLAGS_FINALIZE the hash, the @a length may be any value. + * + * With the #FSL_HASH_FLAGS_INIT and #FSL_HASH_FLAGS_FINALIZE flags on, a + * one-shot complete hash, including padding, will be performed. The @a length + * may be any value. + * + * The first octets of a data stream can be hashed by setting the + * #FSL_HASH_FLAGS_INIT and #FSL_HASH_FLAGS_SAVE flags. The @a length must be + * a multiple of 64. + * + * The flag #FSL_HASH_FLAGS_LOAD is used to load a context previously saved by + * #FSL_HASH_FLAGS_SAVE. The two in combination will allow a (multiple-of-64 + * octets) 'middle sequence' of the data stream to be hashed with the + * beginning. The @a length must again be a multiple of 64. + * + * Since the flag #FSL_HASH_FLAGS_LOAD is used to load a context previously + * saved by #FSL_HASH_FLAGS_SAVE, the #FSL_HASH_FLAGS_LOAD and + * #FSL_HASH_FLAGS_FINALIZE flags, used together, can be used to finish the + * stream. The @a length may be any value. + * + * If the user program wants to do the padding for the hash, it can leave off + * the #FSL_HASH_FLAGS_FINALIZE flag. The @a length must then be a multiple of + * 64 octets. + * + * @param user_ctx A user context from #fsl_shw_register_user(). + * @param[in,out] hash_ctx Hashing algorithm and state of the cipher. + * @param msg Pointer to the data to be hashed. + * @param length Length, in octets, of the @a msg. + * @param[out] result If not null, pointer to where to store the hash + * digest. + * @param result_len Number of octets to store in @a result. + * + * @return A return code of type #fsl_shw_return_t. + */ +fsl_shw_return_t fsl_shw_hash(fsl_shw_uco_t * user_ctx, + fsl_shw_hco_t * hash_ctx, + const uint8_t * msg, + uint32_t length, + uint8_t * result, uint32_t result_len) +{ + SAH_SF_DCLS; + unsigned ctx_flags = (hash_ctx->flags & (FSL_HASH_FLAGS_INIT + | FSL_HASH_FLAGS_LOAD + | FSL_HASH_FLAGS_SAVE + | FSL_HASH_FLAGS_FINALIZE)); + + SAH_SF_USER_CHECK(); + + /* Reset expectations if user gets overly zealous. */ + if (result_len > hash_ctx->digest_length) { + result_len = hash_ctx->digest_length; + } + + /* Validate hash ctx flags. + * Need INIT or LOAD but not both. + * Need SAVE or digest ptr (both is ok). + */ + if (((ctx_flags & (FSL_HASH_FLAGS_INIT | FSL_HASH_FLAGS_LOAD)) + == (FSL_HASH_FLAGS_INIT | FSL_HASH_FLAGS_LOAD)) + || ((ctx_flags & (FSL_HASH_FLAGS_INIT | FSL_HASH_FLAGS_LOAD)) == 0) + || (!(ctx_flags & FSL_HASH_FLAGS_SAVE) && (result == NULL))) { + ret = FSL_RETURN_BAD_FLAG_S; + goto out; + } + + if (ctx_flags & FSL_HASH_FLAGS_INIT) { + sah_Oct_Str out_ptr; + unsigned out_len; + + /* Create desc to perform the initial hashing operation */ + /* Desc. #8 w/INIT and algorithm */ + header = SAH_HDR_MDHA_SET_MODE_HASH + ^ sah_insert_mdha_init + ^ sah_insert_mdha_algorithm[hash_ctx->algorithm]; + + /* If user wants one-shot, set padding operation. */ + if (ctx_flags & FSL_HASH_FLAGS_FINALIZE) { + header ^= sah_insert_mdha_pdata; + } + + /* Determine where Digest will go - hash_ctx or result */ + if (ctx_flags & FSL_HASH_FLAGS_SAVE) { + out_ptr = (sah_Oct_Str) hash_ctx->context; + out_len = hash_ctx->context_register_length; + } else { + out_ptr = result; + out_len = (result_len > hash_ctx->digest_length) + ? hash_ctx->digest_length : result_len; + } + + DESC_IN_OUT(header, length, (sah_Oct_Str) msg, out_len, + out_ptr); + } else { /* not doing hash INIT */ + void *out_ptr; + unsigned out_len; + + /* + * Build two descriptors -- one to load in context/set mode, the + * other to compute & retrieve hash/context value. + * + * First up - Desc. #6 to load context. + */ + /* Desc. #8 w/algorithm */ + header = SAH_HDR_MDHA_SET_MODE_MD_KEY + ^ sah_insert_mdha_algorithm[hash_ctx->algorithm]; + + if (ctx_flags & FSL_HASH_FLAGS_FINALIZE) { + header ^= sah_insert_mdha_pdata; + } + + /* Message Digest (in) */ + DESC_IN_IN(header, + hash_ctx->context_register_length, + (sah_Oct_Str) hash_ctx->context, 0, NULL); + + if (ctx_flags & FSL_HASH_FLAGS_SAVE) { + out_ptr = hash_ctx->context; + out_len = hash_ctx->context_register_length; + } else { + out_ptr = result; + out_len = result_len; + } + + /* Second -- run data through and retrieve ctx regs */ + /* Desc. #10 - no mode register with this. */ + header = SAH_HDR_MDHA_HASH; + DESC_IN_OUT(header, length, (sah_Oct_Str) msg, out_len, + out_ptr); + } /* else not INIT */ + + /* Now that execution is rejoined, we can append another descriptor + to extract the digest/context a second time, into the result. */ + if ((ctx_flags & FSL_HASH_FLAGS_SAVE) + && (result != NULL) && (result_len != 0)) { + + header = SAH_HDR_MDHA_STORE_DIGEST; + + /* Message Digest (out) */ + DESC_IN_OUT(header, 0, NULL, + (result_len > hash_ctx->digest_length) + ? hash_ctx->digest_length : result_len, result); + } + + SAH_SF_EXECUTE(); + + out: + SAH_SF_DESC_CLEAN(); + + return ret; +} /* fsl_shw_hash() */ |