1 /* Copyright (c) 2018, Google Inc.
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
15 #include <openssl/aead.h>
19 #include <openssl/cipher.h>
20 #include <openssl/err.h>
21 #include <openssl/mem.h>
23 #include "../fipsmodule/cipher/internal.h"
26 #define EVP_AEAD_AES_CCM_MAX_TAG_LEN 16
28 struct aead_aes_ccm_ctx {
36 static int aead_aes_ccm_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
37 size_t key_len, size_t tag_len, unsigned M,
39 assert(M == EVP_AEAD_max_overhead(ctx->aead));
40 assert(M == EVP_AEAD_max_tag_len(ctx->aead));
41 assert(15 - L == EVP_AEAD_nonce_length(ctx->aead));
43 if (key_len != EVP_AEAD_key_length(ctx->aead)) {
44 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_KEY_LENGTH);
45 return 0; // EVP_AEAD_CTX_init should catch this.
48 if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) {
53 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TAG_TOO_LARGE);
57 struct aead_aes_ccm_ctx *ccm_ctx =
58 OPENSSL_malloc(sizeof(struct aead_aes_ccm_ctx));
59 if (ccm_ctx == NULL) {
60 OPENSSL_PUT_ERROR(CIPHER, ERR_R_MALLOC_FAILURE);
65 ctr128_f ctr = aes_ctr_set_key(&ccm_ctx->ks.ks, NULL, &block, key, key_len);
66 ctx->tag_len = tag_len;
67 if (!CRYPTO_ccm128_init(&ccm_ctx->ccm, &ccm_ctx->ks.ks, block, ctr, M, L)) {
68 OPENSSL_PUT_ERROR(CIPHER, ERR_R_INTERNAL_ERROR);
69 OPENSSL_free(ccm_ctx);
73 ctx->aead_state = ccm_ctx;
77 static void aead_aes_ccm_cleanup(EVP_AEAD_CTX *ctx) {
78 OPENSSL_free(ctx->aead_state);
81 static int aead_aes_ccm_seal_scatter(
82 const EVP_AEAD_CTX *ctx, uint8_t *out, uint8_t *out_tag,
83 size_t *out_tag_len, size_t max_out_tag_len, const uint8_t *nonce,
84 size_t nonce_len, const uint8_t *in, size_t in_len, const uint8_t *extra_in,
85 size_t extra_in_len, const uint8_t *ad, size_t ad_len) {
86 const struct aead_aes_ccm_ctx *ccm_ctx = ctx->aead_state;
88 if (in_len > CRYPTO_ccm128_max_input(&ccm_ctx->ccm)) {
89 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
93 if (max_out_tag_len < ctx->tag_len) {
94 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BUFFER_TOO_SMALL);
98 if (nonce_len != EVP_AEAD_nonce_length(ctx->aead)) {
99 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INVALID_NONCE_SIZE);
103 if (!CRYPTO_ccm128_encrypt(&ccm_ctx->ccm, &ccm_ctx->ks.ks, out, out_tag,
104 ctx->tag_len, nonce, nonce_len, in, in_len, ad,
106 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
110 *out_tag_len = ctx->tag_len;
114 static int aead_aes_ccm_open_gather(const EVP_AEAD_CTX *ctx, uint8_t *out,
115 const uint8_t *nonce, size_t nonce_len,
116 const uint8_t *in, size_t in_len,
117 const uint8_t *in_tag, size_t in_tag_len,
118 const uint8_t *ad, size_t ad_len) {
119 const struct aead_aes_ccm_ctx *ccm_ctx = ctx->aead_state;
121 if (in_len > CRYPTO_ccm128_max_input(&ccm_ctx->ccm)) {
122 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
126 if (nonce_len != EVP_AEAD_nonce_length(ctx->aead)) {
127 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INVALID_NONCE_SIZE);
131 if (in_tag_len != ctx->tag_len) {
132 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
136 uint8_t tag[EVP_AEAD_AES_CCM_MAX_TAG_LEN];
137 assert(ctx->tag_len <= EVP_AEAD_AES_CCM_MAX_TAG_LEN);
138 if (!CRYPTO_ccm128_decrypt(&ccm_ctx->ccm, &ccm_ctx->ks.ks, out, tag,
139 ctx->tag_len, nonce, nonce_len, in, in_len, ad,
141 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
145 if (CRYPTO_memcmp(tag, in_tag, ctx->tag_len) != 0) {
146 OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
153 static int aead_aes_ccm_bluetooth_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
154 size_t key_len, size_t tag_len) {
155 return aead_aes_ccm_init(ctx, key, key_len, tag_len, 4, 2);
158 static const EVP_AEAD aead_aes_128_ccm_bluetooth = {
159 16, // key length (AES-128)
163 0, // seal_scatter_supports_extra_in
165 aead_aes_ccm_bluetooth_init,
166 NULL /* init_with_direction */,
167 aead_aes_ccm_cleanup,
169 aead_aes_ccm_seal_scatter,
170 aead_aes_ccm_open_gather,
175 const EVP_AEAD *EVP_aead_aes_128_ccm_bluetooth(void) {
176 return &aead_aes_128_ccm_bluetooth;
179 static int aead_aes_ccm_bluetooth_8_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
180 size_t key_len, size_t tag_len) {
181 return aead_aes_ccm_init(ctx, key, key_len, tag_len, 8, 2);
184 static const EVP_AEAD aead_aes_128_ccm_bluetooth_8 = {
185 16, // key length (AES-128)
189 0, // seal_scatter_supports_extra_in
191 aead_aes_ccm_bluetooth_8_init,
192 NULL /* init_with_direction */,
193 aead_aes_ccm_cleanup,
195 aead_aes_ccm_seal_scatter,
196 aead_aes_ccm_open_gather,
201 const EVP_AEAD *EVP_aead_aes_128_ccm_bluetooth_8(void) {
202 return &aead_aes_128_ccm_bluetooth_8;