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- /* Copyright (c) 2018, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
-
- #include <openssl/aead.h>
-
- #include <assert.h>
-
- #include <openssl/cipher.h>
- #include <openssl/err.h>
- #include <openssl/mem.h>
-
- #include "../fipsmodule/cipher/internal.h"
-
-
- #define EVP_AEAD_AES_CCM_MAX_TAG_LEN 16
-
- struct aead_aes_ccm_ctx {
- union {
- double align;
- AES_KEY ks;
- } ks;
- CCM128_CONTEXT ccm;
- };
-
- static int aead_aes_ccm_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
- size_t key_len, size_t tag_len, unsigned M,
- unsigned L) {
- assert(M == EVP_AEAD_max_overhead(ctx->aead));
- assert(M == EVP_AEAD_max_tag_len(ctx->aead));
- assert(15 - L == EVP_AEAD_nonce_length(ctx->aead));
-
- if (key_len != EVP_AEAD_key_length(ctx->aead)) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_KEY_LENGTH);
- return 0; // EVP_AEAD_CTX_init should catch this.
- }
-
- if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) {
- tag_len = M;
- }
-
- if (tag_len != M) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TAG_TOO_LARGE);
- return 0;
- }
-
- struct aead_aes_ccm_ctx *ccm_ctx =
- OPENSSL_malloc(sizeof(struct aead_aes_ccm_ctx));
- if (ccm_ctx == NULL) {
- OPENSSL_PUT_ERROR(CIPHER, ERR_R_MALLOC_FAILURE);
- return 0;
- }
-
- block128_f block;
- ctr128_f ctr = aes_ctr_set_key(&ccm_ctx->ks.ks, NULL, &block, key, key_len);
- ctx->tag_len = tag_len;
- if (!CRYPTO_ccm128_init(&ccm_ctx->ccm, &ccm_ctx->ks.ks, block, ctr, M, L)) {
- OPENSSL_PUT_ERROR(CIPHER, ERR_R_INTERNAL_ERROR);
- OPENSSL_free(ccm_ctx);
- return 0;
- }
-
- ctx->aead_state = ccm_ctx;
- return 1;
- }
-
- static void aead_aes_ccm_cleanup(EVP_AEAD_CTX *ctx) {
- OPENSSL_free(ctx->aead_state);
- }
-
- static int aead_aes_ccm_seal_scatter(
- const EVP_AEAD_CTX *ctx, uint8_t *out, uint8_t *out_tag,
- size_t *out_tag_len, size_t max_out_tag_len, const uint8_t *nonce,
- size_t nonce_len, const uint8_t *in, size_t in_len, const uint8_t *extra_in,
- size_t extra_in_len, const uint8_t *ad, size_t ad_len) {
- const struct aead_aes_ccm_ctx *ccm_ctx = ctx->aead_state;
-
- if (in_len > CRYPTO_ccm128_max_input(&ccm_ctx->ccm)) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
- return 0;
- }
-
- if (max_out_tag_len < ctx->tag_len) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BUFFER_TOO_SMALL);
- return 0;
- }
-
- if (nonce_len != EVP_AEAD_nonce_length(ctx->aead)) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INVALID_NONCE_SIZE);
- return 0;
- }
-
- if (!CRYPTO_ccm128_encrypt(&ccm_ctx->ccm, &ccm_ctx->ks.ks, out, out_tag,
- ctx->tag_len, nonce, nonce_len, in, in_len, ad,
- ad_len)) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
- return 0;
- }
-
- *out_tag_len = ctx->tag_len;
- return 1;
- }
-
- static int aead_aes_ccm_open_gather(const EVP_AEAD_CTX *ctx, uint8_t *out,
- const uint8_t *nonce, size_t nonce_len,
- const uint8_t *in, size_t in_len,
- const uint8_t *in_tag, size_t in_tag_len,
- const uint8_t *ad, size_t ad_len) {
- const struct aead_aes_ccm_ctx *ccm_ctx = ctx->aead_state;
-
- if (in_len > CRYPTO_ccm128_max_input(&ccm_ctx->ccm)) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
- return 0;
- }
-
- if (nonce_len != EVP_AEAD_nonce_length(ctx->aead)) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INVALID_NONCE_SIZE);
- return 0;
- }
-
- if (in_tag_len != ctx->tag_len) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
- return 0;
- }
-
- uint8_t tag[EVP_AEAD_AES_CCM_MAX_TAG_LEN];
- assert(ctx->tag_len <= EVP_AEAD_AES_CCM_MAX_TAG_LEN);
- if (!CRYPTO_ccm128_decrypt(&ccm_ctx->ccm, &ccm_ctx->ks.ks, out, tag,
- ctx->tag_len, nonce, nonce_len, in, in_len, ad,
- ad_len)) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
- return 0;
- }
-
- if (CRYPTO_memcmp(tag, in_tag, ctx->tag_len) != 0) {
- OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
- return 0;
- }
-
- return 1;
- }
-
- static int aead_aes_ccm_bluetooth_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
- size_t key_len, size_t tag_len) {
- return aead_aes_ccm_init(ctx, key, key_len, tag_len, 4, 2);
- }
-
- static const EVP_AEAD aead_aes_128_ccm_bluetooth = {
- 16, // key length (AES-128)
- 13, // nonce length
- 4, // overhead
- 4, // max tag length
- 0, // seal_scatter_supports_extra_in
-
- aead_aes_ccm_bluetooth_init,
- NULL /* init_with_direction */,
- aead_aes_ccm_cleanup,
- NULL /* open */,
- aead_aes_ccm_seal_scatter,
- aead_aes_ccm_open_gather,
- NULL /* get_iv */,
- NULL /* tag_len */,
- };
-
- const EVP_AEAD *EVP_aead_aes_128_ccm_bluetooth(void) {
- return &aead_aes_128_ccm_bluetooth;
- }
-
- static int aead_aes_ccm_bluetooth_8_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
- size_t key_len, size_t tag_len) {
- return aead_aes_ccm_init(ctx, key, key_len, tag_len, 8, 2);
- }
-
- static const EVP_AEAD aead_aes_128_ccm_bluetooth_8 = {
- 16, // key length (AES-128)
- 13, // nonce length
- 8, // overhead
- 8, // max tag length
- 0, // seal_scatter_supports_extra_in
-
- aead_aes_ccm_bluetooth_8_init,
- NULL /* init_with_direction */,
- aead_aes_ccm_cleanup,
- NULL /* open */,
- aead_aes_ccm_seal_scatter,
- aead_aes_ccm_open_gather,
- NULL /* get_iv */,
- NULL /* tag_len */,
- };
-
- const EVP_AEAD *EVP_aead_aes_128_ccm_bluetooth_8(void) {
- return &aead_aes_128_ccm_bluetooth_8;
- }
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