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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (C) 2018, ARM Limited
* Copyright (C) 2019, Linaro Limited
*/
#include <assert.h>
#include <compiler.h>
#include <crypto/crypto.h>
#include <crypto/crypto_impl.h>
#include <kernel/panic.h>
#include <mbedtls/md.h>
#include <stdlib.h>
#include <string.h>
#include <tee_api_types.h>
#include <utee_defines.h>
#include <util.h>
struct mbed_hmac_ctx {
struct crypto_mac_ctx mac_ctx;
mbedtls_md_context_t md_ctx;
};
static const struct crypto_mac_ops mbed_hmac_ops;
static struct mbed_hmac_ctx *to_hmac_ctx(struct crypto_mac_ctx *ctx)
{
assert(ctx && ctx->ops == &mbed_hmac_ops);
return container_of(ctx, struct mbed_hmac_ctx, mac_ctx);
}
static TEE_Result mbed_hmac_init(struct crypto_mac_ctx *ctx,
const uint8_t *key, size_t len)
{
if (mbedtls_md_hmac_starts(&to_hmac_ctx(ctx)->md_ctx, key, len))
return TEE_ERROR_BAD_STATE;
return TEE_SUCCESS;
}
static TEE_Result mbed_hmac_update(struct crypto_mac_ctx *ctx,
const uint8_t *data, size_t len)
{
if (mbedtls_md_hmac_update(&to_hmac_ctx(ctx)->md_ctx, data, len))
return TEE_ERROR_BAD_STATE;
return TEE_SUCCESS;
}
static TEE_Result mbed_hmac_final(struct crypto_mac_ctx *ctx, uint8_t *digest,
size_t len)
{
struct mbed_hmac_ctx *c = to_hmac_ctx(ctx);
uint8_t block_digest[TEE_MAX_HASH_SIZE] = { 0 };
uint8_t *tmp_digest = NULL;
size_t hmac_size = 0;
if (len == 0)
return TEE_ERROR_BAD_PARAMETERS;
hmac_size = mbedtls_md_get_size(mbedtls_md_info_from_ctx(&c->md_ctx));
if (hmac_size > len) {
if (hmac_size > sizeof(block_digest))
return TEE_ERROR_BAD_STATE;
tmp_digest = block_digest; /* use a tempory buffer */
} else {
tmp_digest = digest;
}
if (mbedtls_md_hmac_finish(&c->md_ctx, tmp_digest))
return TEE_ERROR_BAD_STATE;
if (hmac_size > len)
memcpy(digest, tmp_digest, len);
return TEE_SUCCESS;
}
static void mbed_hmac_free_ctx(struct crypto_mac_ctx *ctx)
{
struct mbed_hmac_ctx *c = to_hmac_ctx(ctx);
mbedtls_md_free(&c->md_ctx);
free(c);
}
static void mbed_hmac_copy_state(struct crypto_mac_ctx *dst_ctx,
struct crypto_mac_ctx *src_ctx)
{
struct mbed_hmac_ctx *src = to_hmac_ctx(src_ctx);
struct mbed_hmac_ctx *dst = to_hmac_ctx(dst_ctx);
if (mbedtls_md_clone(&dst->md_ctx, &src->md_ctx))
panic();
}
static const struct crypto_mac_ops mbed_hmac_ops = {
.init = mbed_hmac_init,
.update = mbed_hmac_update,
.final = mbed_hmac_final,
.free_ctx = mbed_hmac_free_ctx,
.copy_state = mbed_hmac_copy_state,
};
static TEE_Result mbed_hmac_alloc_ctx(struct crypto_mac_ctx **ctx_ret,
mbedtls_md_type_t md_type)
{
int mbed_res = 0;
struct mbed_hmac_ctx *c = NULL;
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_type);
if (!md_info)
return TEE_ERROR_NOT_SUPPORTED;
c = calloc(1, sizeof(*c));
if (!c)
return TEE_ERROR_OUT_OF_MEMORY;
c->mac_ctx.ops = &mbed_hmac_ops;
mbed_res = mbedtls_md_setup(&c->md_ctx, md_info, 1);
if (mbed_res) {
free(c);
if (mbed_res == MBEDTLS_ERR_MD_ALLOC_FAILED)
return TEE_ERROR_OUT_OF_MEMORY;
return TEE_ERROR_NOT_SUPPORTED;
}
*ctx_ret = &c->mac_ctx;
return TEE_SUCCESS;
}
#if defined(CFG_CRYPTO_MD5)
TEE_Result crypto_hmac_md5_alloc_ctx(struct crypto_mac_ctx **ctx)
{
return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_MD5);
}
#endif
#if defined(CFG_CRYPTO_SHA1)
TEE_Result crypto_hmac_sha1_alloc_ctx(struct crypto_mac_ctx **ctx)
{
return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA1);
}
#endif
#if defined(CFG_CRYPTO_SHA224)
TEE_Result crypto_hmac_sha224_alloc_ctx(struct crypto_mac_ctx **ctx)
{
return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA224);
}
#endif
#if defined(CFG_CRYPTO_SHA256)
TEE_Result crypto_hmac_sha256_alloc_ctx(struct crypto_mac_ctx **ctx)
{
return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA256);
}
#endif
#if defined(CFG_CRYPTO_SHA384)
TEE_Result crypto_hmac_sha384_alloc_ctx(struct crypto_mac_ctx **ctx)
{
return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA384);
}
#endif
#if defined(CFG_CRYPTO_SHA512)
TEE_Result crypto_hmac_sha512_alloc_ctx(struct crypto_mac_ctx **ctx)
{
return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA512);
}
#endif
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