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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2014-2019, Linaro Limited
*/
#include <assert.h>
#include <crypto/crypto.h>
#include <crypto/crypto_impl.h>
#include <stdlib.h>
#include <string.h>
#include <tee_api_types.h>
#include <tomcrypt.h>
#include <utee_defines.h>
#include <util.h>
/******************************************************************************
* Message digest functions
******************************************************************************/
struct ltc_hash_ctx {
struct crypto_hash_ctx ctx;
const struct ltc_hash_descriptor *descr;
hash_state state;
};
static const struct crypto_hash_ops ltc_hash_ops;
static struct ltc_hash_ctx *to_hash_ctx(struct crypto_hash_ctx *ctx)
{
assert(ctx && ctx->ops == <c_hash_ops);
return container_of(ctx, struct ltc_hash_ctx, ctx);
}
static TEE_Result ltc_hash_init(struct crypto_hash_ctx *ctx)
{
struct ltc_hash_ctx *hc = to_hash_ctx(ctx);
if (hc->descr->init(&hc->state) == CRYPT_OK)
return TEE_SUCCESS;
else
return TEE_ERROR_BAD_STATE;
}
static TEE_Result ltc_hash_update(struct crypto_hash_ctx *ctx,
const uint8_t *data, size_t len)
{
struct ltc_hash_ctx *hc = to_hash_ctx(ctx);
if (hc->descr->process(&hc->state, data, len) == CRYPT_OK)
return TEE_SUCCESS;
else
return TEE_ERROR_BAD_STATE;
}
static TEE_Result ltc_hash_final(struct crypto_hash_ctx *ctx, uint8_t *digest,
size_t len)
{
struct ltc_hash_ctx *hc = to_hash_ctx(ctx);
size_t hash_size = hc->descr->hashsize;
uint8_t block_digest[TEE_MAX_HASH_SIZE] = { 0 };
uint8_t *tmp_digest = NULL;
if (len == 0)
return TEE_ERROR_BAD_PARAMETERS;
if (hash_size > len) {
if (hash_size > sizeof(block_digest))
return TEE_ERROR_BAD_STATE;
tmp_digest = block_digest; /* use a tempory buffer */
} else {
tmp_digest = digest;
}
if (hc->descr->done(&hc->state, tmp_digest) == CRYPT_OK) {
if (hash_size > len)
memcpy(digest, tmp_digest, len);
} else {
return TEE_ERROR_BAD_STATE;
}
return TEE_SUCCESS;
}
static void ltc_hash_free_ctx(struct crypto_hash_ctx *ctx)
{
free(to_hash_ctx(ctx));
}
static void ltc_hash_copy_state(struct crypto_hash_ctx *dst_ctx,
struct crypto_hash_ctx *src_ctx)
{
struct ltc_hash_ctx *src = to_hash_ctx(src_ctx);
struct ltc_hash_ctx *dst = to_hash_ctx(dst_ctx);
assert(src->descr == dst->descr);
dst->state = src->state;
}
static const struct crypto_hash_ops ltc_hash_ops = {
.init = ltc_hash_init,
.update = ltc_hash_update,
.final = ltc_hash_final,
.free_ctx = ltc_hash_free_ctx,
.copy_state = ltc_hash_copy_state,
};
static TEE_Result ltc_hash_alloc_ctx(struct crypto_hash_ctx **ctx_ret,
int ltc_hash_idx)
{
struct ltc_hash_ctx *ctx = NULL;
if (ltc_hash_idx < 0)
return TEE_ERROR_NOT_SUPPORTED;
ctx = calloc(1, sizeof(*ctx));
if (!ctx)
return TEE_ERROR_OUT_OF_MEMORY;
ctx->ctx.ops = <c_hash_ops;
ctx->descr = hash_descriptor[ltc_hash_idx];
*ctx_ret = &ctx->ctx;
return TEE_SUCCESS;
}
#if defined(_CFG_CORE_LTC_MD5)
TEE_Result crypto_md5_alloc_ctx(struct crypto_hash_ctx **ctx)
{
return ltc_hash_alloc_ctx(ctx, find_hash("md5"));
}
#endif
#if defined(_CFG_CORE_LTC_SHA1)
TEE_Result crypto_sha1_alloc_ctx(struct crypto_hash_ctx **ctx)
{
return ltc_hash_alloc_ctx(ctx, find_hash("sha1"));
}
#endif
#if defined(_CFG_CORE_LTC_SHA224)
TEE_Result crypto_sha224_alloc_ctx(struct crypto_hash_ctx **ctx)
{
return ltc_hash_alloc_ctx(ctx, find_hash("sha224"));
}
#endif
#if defined(_CFG_CORE_LTC_SHA256)
TEE_Result crypto_sha256_alloc_ctx(struct crypto_hash_ctx **ctx)
{
return ltc_hash_alloc_ctx(ctx, find_hash("sha256"));
}
#endif
#if defined(_CFG_CORE_LTC_SHA384)
TEE_Result crypto_sha384_alloc_ctx(struct crypto_hash_ctx **ctx)
{
return ltc_hash_alloc_ctx(ctx, find_hash("sha384"));
}
#endif
#if defined(_CFG_CORE_LTC_SHA512)
TEE_Result crypto_sha512_alloc_ctx(struct crypto_hash_ctx **ctx)
{
return ltc_hash_alloc_ctx(ctx, find_hash("sha512"));
}
#endif
#if defined(_CFG_CORE_LTC_SHA256)
TEE_Result hash_sha256_check(const uint8_t *hash, const uint8_t *data,
size_t data_size)
{
hash_state hs;
uint8_t digest[TEE_SHA256_HASH_SIZE];
if (sha256_init(&hs) != CRYPT_OK)
return TEE_ERROR_GENERIC;
if (sha256_process(&hs, data, data_size) != CRYPT_OK)
return TEE_ERROR_GENERIC;
if (sha256_done(&hs, digest) != CRYPT_OK)
return TEE_ERROR_GENERIC;
if (consttime_memcmp(digest, hash, sizeof(digest)) != 0)
return TEE_ERROR_SECURITY;
return TEE_SUCCESS;
}
#endif
#if defined(_CFG_CORE_LTC_SHA512_256)
TEE_Result hash_sha512_256_compute(uint8_t *digest, const uint8_t *data,
size_t data_size)
{
hash_state hs;
if (sha512_256_init(&hs) != CRYPT_OK)
return TEE_ERROR_GENERIC;
if (sha512_256_process(&hs, data, data_size) != CRYPT_OK)
return TEE_ERROR_GENERIC;
if (sha512_256_done(&hs, digest) != CRYPT_OK)
return TEE_ERROR_GENERIC;
return TEE_SUCCESS;
}
#endif
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