ref: bfe9da47cfa2f51ebef78c59332b5ba2deba306d
dir: /third_party/boringssl/src/crypto/cipher_extra/e_aesccm.c/
/* ====================================================================
* Copyright (c) 2008 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ==================================================================== */
#include <openssl/aead.h>
#include <assert.h>
#include <openssl/cpu.h>
#include <openssl/cipher.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "../fipsmodule/cipher/internal.h"
struct ccm128_context {
block128_f block;
ctr128_f ctr;
unsigned M, L;
};
struct ccm128_state {
union {
uint64_t u[2];
uint8_t c[16];
} nonce, cmac;
};
static int CRYPTO_ccm128_init(struct ccm128_context *ctx, const AES_KEY *key,
block128_f block, ctr128_f ctr, unsigned M,
unsigned L) {
if (M < 4 || M > 16 || (M & 1) != 0 || L < 2 || L > 8) {
return 0;
}
ctx->block = block;
ctx->ctr = ctr;
ctx->M = M;
ctx->L = L;
return 1;
}
static size_t CRYPTO_ccm128_max_input(const struct ccm128_context *ctx) {
return ctx->L >= sizeof(size_t) ? (size_t)-1
: (((size_t)1) << (ctx->L * 8)) - 1;
}
static int ccm128_init_state(const struct ccm128_context *ctx,
struct ccm128_state *state, const AES_KEY *key,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *aad, size_t aad_len,
size_t plaintext_len) {
const block128_f block = ctx->block;
const unsigned M = ctx->M;
const unsigned L = ctx->L;
// |L| determines the expected |nonce_len| and the limit for |plaintext_len|.
if (plaintext_len > CRYPTO_ccm128_max_input(ctx) ||
nonce_len != 15 - L) {
return 0;
}
// Assemble the first block for computing the MAC.
OPENSSL_memset(state, 0, sizeof(*state));
state->nonce.c[0] = (uint8_t)((L - 1) | ((M - 2) / 2) << 3);
if (aad_len != 0) {
state->nonce.c[0] |= 0x40; // Set AAD Flag
}
OPENSSL_memcpy(&state->nonce.c[1], nonce, nonce_len);
for (unsigned i = 0; i < L; i++) {
state->nonce.c[15 - i] = (uint8_t)(plaintext_len >> (8 * i));
}
(*block)(state->nonce.c, state->cmac.c, key);
size_t blocks = 1;
if (aad_len != 0) {
unsigned i;
// Cast to u64 to avoid the compiler complaining about invalid shifts.
uint64_t aad_len_u64 = aad_len;
if (aad_len_u64 < 0x10000 - 0x100) {
state->cmac.c[0] ^= (uint8_t)(aad_len_u64 >> 8);
state->cmac.c[1] ^= (uint8_t)aad_len_u64;
i = 2;
} else if (aad_len_u64 <= 0xffffffff) {
state->cmac.c[0] ^= 0xff;
state->cmac.c[1] ^= 0xfe;
state->cmac.c[2] ^= (uint8_t)(aad_len_u64 >> 24);
state->cmac.c[3] ^= (uint8_t)(aad_len_u64 >> 16);
state->cmac.c[4] ^= (uint8_t)(aad_len_u64 >> 8);
state->cmac.c[5] ^= (uint8_t)aad_len_u64;
i = 6;
} else {
state->cmac.c[0] ^= 0xff;
state->cmac.c[1] ^= 0xff;
state->cmac.c[2] ^= (uint8_t)(aad_len_u64 >> 56);
state->cmac.c[3] ^= (uint8_t)(aad_len_u64 >> 48);
state->cmac.c[4] ^= (uint8_t)(aad_len_u64 >> 40);
state->cmac.c[5] ^= (uint8_t)(aad_len_u64 >> 32);
state->cmac.c[6] ^= (uint8_t)(aad_len_u64 >> 24);
state->cmac.c[7] ^= (uint8_t)(aad_len_u64 >> 16);
state->cmac.c[8] ^= (uint8_t)(aad_len_u64 >> 8);
state->cmac.c[9] ^= (uint8_t)aad_len_u64;
i = 10;
}
do {
for (; i < 16 && aad_len != 0; i++) {
state->cmac.c[i] ^= *aad;
aad++;
aad_len--;
}
(*block)(state->cmac.c, state->cmac.c, key);
blocks++;
i = 0;
} while (aad_len != 0);
}
// Per RFC 3610, section 2.6, the total number of block cipher operations done
// must not exceed 2^61. There are two block cipher operations remaining per
// message block, plus one block at the end to encrypt the MAC.
size_t remaining_blocks = 2 * ((plaintext_len + 15) / 16) + 1;
if (plaintext_len + 15 < plaintext_len ||
remaining_blocks + blocks < blocks ||
(uint64_t) remaining_blocks + blocks > UINT64_C(1) << 61) {
return 0;
}
// Assemble the first block for encrypting and decrypting. The bottom |L|
// bytes are replaced with a counter and all bit the encoding of |L| is
// cleared in the first byte.
state->nonce.c[0] &= 7;
return 1;
}
static int ccm128_encrypt(const struct ccm128_context *ctx,
struct ccm128_state *state, const AES_KEY *key,
uint8_t *out, const uint8_t *in, size_t len) {
// The counter for encryption begins at one.
for (unsigned i = 0; i < ctx->L; i++) {
state->nonce.c[15 - i] = 0;
}
state->nonce.c[15] = 1;
uint8_t partial_buf[16];
unsigned num = 0;
if (ctx->ctr != NULL) {
CRYPTO_ctr128_encrypt_ctr32(in, out, len, key, state->nonce.c, partial_buf,
&num, ctx->ctr);
} else {
CRYPTO_ctr128_encrypt(in, out, len, key, state->nonce.c, partial_buf, &num,
ctx->block);
}
return 1;
}
static int ccm128_compute_mac(const struct ccm128_context *ctx,
struct ccm128_state *state, const AES_KEY *key,
uint8_t *out_tag, size_t tag_len,
const uint8_t *in, size_t len) {
block128_f block = ctx->block;
if (tag_len != ctx->M) {
return 0;
}
// Incorporate |in| into the MAC.
union {
uint64_t u[2];
uint8_t c[16];
} tmp;
while (len >= 16) {
OPENSSL_memcpy(tmp.c, in, 16);
state->cmac.u[0] ^= tmp.u[0];
state->cmac.u[1] ^= tmp.u[1];
(*block)(state->cmac.c, state->cmac.c, key);
in += 16;
len -= 16;
}
if (len > 0) {
for (size_t i = 0; i < len; i++) {
state->cmac.c[i] ^= in[i];
}
(*block)(state->cmac.c, state->cmac.c, key);
}
// Encrypt the MAC with counter zero.
for (unsigned i = 0; i < ctx->L; i++) {
state->nonce.c[15 - i] = 0;
}
(*block)(state->nonce.c, tmp.c, key);
state->cmac.u[0] ^= tmp.u[0];
state->cmac.u[1] ^= tmp.u[1];
OPENSSL_memcpy(out_tag, state->cmac.c, tag_len);
return 1;
}
static int CRYPTO_ccm128_encrypt(const struct ccm128_context *ctx,
const AES_KEY *key, uint8_t *out,
uint8_t *out_tag, size_t tag_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t len,
const uint8_t *aad, size_t aad_len) {
struct ccm128_state state;
return ccm128_init_state(ctx, &state, key, nonce, nonce_len, aad, aad_len,
len) &&
ccm128_compute_mac(ctx, &state, key, out_tag, tag_len, in, len) &&
ccm128_encrypt(ctx, &state, key, out, in, len);
}
static int CRYPTO_ccm128_decrypt(const struct ccm128_context *ctx,
const AES_KEY *key, uint8_t *out,
uint8_t *out_tag, size_t tag_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t len,
const uint8_t *aad, size_t aad_len) {
struct ccm128_state state;
return ccm128_init_state(ctx, &state, key, nonce, nonce_len, aad, aad_len,
len) &&
ccm128_encrypt(ctx, &state, key, out, in, len) &&
ccm128_compute_mac(ctx, &state, key, out_tag, tag_len, out, len);
}
#define EVP_AEAD_AES_CCM_MAX_TAG_LEN 16
struct aead_aes_ccm_ctx {
union {
double align;
AES_KEY ks;
} ks;
struct 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;
}