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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>
struct ltc_omac_ctx {
struct crypto_mac_ctx ctx;
int cipher_idx;
omac_state state;
};
static const struct crypto_mac_ops ltc_omac_ops;
static struct ltc_omac_ctx *to_omac_ctx(struct crypto_mac_ctx *ctx)
{
assert(ctx && ctx->ops == <c_omac_ops);
return container_of(ctx, struct ltc_omac_ctx, ctx);
}
static TEE_Result ltc_omac_init(struct crypto_mac_ctx *ctx, const uint8_t *key,
size_t len)
{
struct ltc_omac_ctx *hc = to_omac_ctx(ctx);
if (omac_init(&hc->state, hc->cipher_idx, key, len) == CRYPT_OK)
return TEE_SUCCESS;
else
return TEE_ERROR_BAD_STATE;
}
static TEE_Result ltc_omac_update(struct crypto_mac_ctx *ctx,
const uint8_t *data, size_t len)
{
if (omac_process(&to_omac_ctx(ctx)->state, data, len) == CRYPT_OK)
return TEE_SUCCESS;
else
return TEE_ERROR_BAD_STATE;
}
static TEE_Result ltc_omac_final(struct crypto_mac_ctx *ctx, uint8_t *digest,
size_t len)
{
unsigned long l = len;
if (omac_done(&to_omac_ctx(ctx)->state, digest, &l) == CRYPT_OK)
return TEE_SUCCESS;
else
return TEE_ERROR_BAD_STATE;
}
static void ltc_omac_free_ctx(struct crypto_mac_ctx *ctx)
{
free(to_omac_ctx(ctx));
}
static void ltc_omac_copy_state(struct crypto_mac_ctx *dst_ctx,
struct crypto_mac_ctx *src_ctx)
{
struct ltc_omac_ctx *src = to_omac_ctx(src_ctx);
struct ltc_omac_ctx *dst = to_omac_ctx(dst_ctx);
assert(src->cipher_idx == dst->cipher_idx);
dst->state = src->state;
}
static const struct crypto_mac_ops ltc_omac_ops = {
.init = ltc_omac_init,
.update = ltc_omac_update,
.final = ltc_omac_final,
.free_ctx = ltc_omac_free_ctx,
.copy_state = ltc_omac_copy_state,
};
TEE_Result crypto_aes_cmac_alloc_ctx(struct crypto_mac_ctx **ctx_ret)
{
struct ltc_omac_ctx *ctx = NULL;
int cipher_idx = find_cipher("aes");
if (cipher_idx < 0)
return TEE_ERROR_NOT_SUPPORTED;
ctx = calloc(1, sizeof(*ctx));
if (!ctx)
return TEE_ERROR_OUT_OF_MEMORY;
ctx->ctx.ops = <c_omac_ops;
ctx->cipher_idx = cipher_idx;
*ctx_ret = &ctx->ctx;
return TEE_SUCCESS;
}
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