lib/libmbedtls/core/aes.c

// SPDX-License-Identifier: BSD-2-Clause
/*
 * Copyright (C) 2018, ARM Limited
 * Copyright (C) 2019, Linaro Limited
 */

#include <crypto/crypto.h>
#include <kernel/panic.h>
#include <mbedtls/aes.h>
#include <string.h>

TEE_Result crypto_aes_expand_enc_key(const void *key, size_t key_len,
				     void *enc_key, size_t enc_keylen,
				     unsigned int *rounds)
{
	mbedtls_aes_context ctx;

	memset(&ctx, 0, sizeof(ctx));
	mbedtls_aes_init(&ctx);
	if (mbedtls_aes_setkey_enc(&ctx, key, key_len * 8) != 0)
		return TEE_ERROR_BAD_PARAMETERS;

	if (enc_keylen > sizeof(ctx.buf))
		return TEE_ERROR_BAD_PARAMETERS;
	memcpy(enc_key, ctx.buf, enc_keylen);
	*rounds = ctx.nr;
	mbedtls_aes_free(&ctx);
	return TEE_SUCCESS;
}

void crypto_aes_enc_block(const void *enc_key, size_t enc_keylen,
			  unsigned int rounds, const void *src, void *dst)
{
	mbedtls_aes_context ctx;

	memset(&ctx, 0, sizeof(ctx));
	mbedtls_aes_init(&ctx);
	if (enc_keylen > sizeof(ctx.buf))
		panic();
	memcpy(ctx.buf, enc_key, enc_keylen);
	ctx.rk = ctx.buf;
	ctx.nr = rounds;
	mbedtls_aes_encrypt(&ctx, src, dst);
	mbedtls_aes_free(&ctx);
}