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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;
};
OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >=
sizeof(struct aead_aes_ccm_ctx),
"AEAD state is too small");
#if defined(__GNUC__) || defined(__clang__)
OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >=
alignof(struct aead_aes_ccm_ctx),
"AEAD state has insufficient alignment");
#endif
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 = (struct aead_aes_ccm_ctx *)&ctx->state;
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);
return 0;
}
return 1;
}
static void aead_aes_ccm_cleanup(EVP_AEAD_CTX *ctx) {}
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 =
(struct aead_aes_ccm_ctx *)&ctx->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 =
(struct aead_aes_ccm_ctx *)&ctx->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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