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