| // SPDX-License-Identifier: BSD-2-Clause |
| /* |
| * Copyright (C) 2019, Linaro Limited |
| */ |
| |
| #include <assert.h> |
| #include <compiler.h> |
| #include <crypto/crypto.h> |
| #include <crypto/crypto_impl.h> |
| #include <mbedtls/aes.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <tee_api_types.h> |
| #include <utee_defines.h> |
| #include <util.h> |
| |
| struct mbed_aes_ctr_ctx { |
| struct crypto_cipher_ctx ctx; |
| mbedtls_aes_context aes_ctx; |
| size_t nc_off; |
| unsigned char counter[TEE_AES_BLOCK_SIZE]; |
| unsigned char block[TEE_AES_BLOCK_SIZE]; |
| }; |
| |
| static const struct crypto_cipher_ops mbed_aes_ctr_ops; |
| |
| static struct mbed_aes_ctr_ctx *to_aes_ctr_ctx(struct crypto_cipher_ctx *ctx) |
| { |
| assert(ctx && ctx->ops == &mbed_aes_ctr_ops); |
| |
| return container_of(ctx, struct mbed_aes_ctr_ctx, ctx); |
| } |
| |
| static TEE_Result mbed_aes_ctr_init(struct crypto_cipher_ctx *ctx, |
| TEE_OperationMode mode __unused, |
| const uint8_t *key1, size_t key1_len, |
| const uint8_t *key2 __unused, |
| size_t key2_len __unused, |
| const uint8_t *iv, size_t iv_len) |
| { |
| struct mbed_aes_ctr_ctx *c = to_aes_ctr_ctx(ctx); |
| |
| if (iv_len != sizeof(c->counter)) |
| return TEE_ERROR_BAD_PARAMETERS; |
| memcpy(c->counter, iv, sizeof(c->counter)); |
| |
| mbedtls_aes_init(&c->aes_ctx); |
| c->nc_off = 0; |
| |
| if (mbedtls_aes_setkey_enc(&c->aes_ctx, key1, key1_len * 8)) |
| return TEE_ERROR_BAD_STATE; |
| |
| return TEE_SUCCESS; |
| } |
| |
| static TEE_Result mbed_aes_ctr_update(struct crypto_cipher_ctx *ctx, |
| bool last_block __unused, |
| const uint8_t *data, size_t len, |
| uint8_t *dst) |
| { |
| struct mbed_aes_ctr_ctx *c = to_aes_ctr_ctx(ctx); |
| |
| if (mbedtls_aes_crypt_ctr(&c->aes_ctx, len, &c->nc_off, c->counter, |
| c->block, data, dst)) |
| return TEE_ERROR_BAD_STATE; |
| |
| return TEE_SUCCESS; |
| } |
| |
| static void mbed_aes_ctr_final(struct crypto_cipher_ctx *ctx) |
| { |
| struct mbed_aes_ctr_ctx *c = to_aes_ctr_ctx(ctx); |
| |
| mbedtls_aes_free(&c->aes_ctx); |
| memset(c->block, 0, sizeof(c->block)); |
| } |
| |
| static void mbed_aes_ctr_free_ctx(struct crypto_cipher_ctx *ctx) |
| { |
| free(to_aes_ctr_ctx(ctx)); |
| } |
| |
| static void mbed_aes_ctr_copy_state(struct crypto_cipher_ctx *dst_ctx, |
| struct crypto_cipher_ctx *src_ctx) |
| { |
| struct mbed_aes_ctr_ctx *src = to_aes_ctr_ctx(src_ctx); |
| struct mbed_aes_ctr_ctx *dst = to_aes_ctr_ctx(dst_ctx); |
| |
| memcpy(dst->counter, src->counter, sizeof(dst->counter)); |
| memcpy(dst->block, src->block, sizeof(dst->block)); |
| dst->nc_off = src->nc_off; |
| dst->aes_ctx = src->aes_ctx; |
| } |
| |
| static const struct crypto_cipher_ops mbed_aes_ctr_ops = { |
| .init = mbed_aes_ctr_init, |
| .update = mbed_aes_ctr_update, |
| .final = mbed_aes_ctr_final, |
| .free_ctx = mbed_aes_ctr_free_ctx, |
| .copy_state = mbed_aes_ctr_copy_state, |
| }; |
| |
| TEE_Result crypto_aes_ctr_alloc_ctx(struct crypto_cipher_ctx **ctx_ret) |
| { |
| struct mbed_aes_ctr_ctx *c = NULL; |
| |
| c = calloc(1, sizeof(*c)); |
| if (!c) |
| return TEE_ERROR_OUT_OF_MEMORY; |
| |
| c->ctx.ops = &mbed_aes_ctr_ops; |
| *ctx_ret = &c->ctx; |
| |
| return TEE_SUCCESS; |
| } |