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583 lines
19 KiB
C
583 lines
19 KiB
C
/*
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* aes_gcm_ossl.c
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*
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* AES Galois Counter Mode
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*
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* John A. Foley
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* Cisco Systems, Inc.
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*
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*/
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/*
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*
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* Copyright (c) 2013-2017, Cisco Systems, Inc.
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* 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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* 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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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; 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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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <openssl/evp.h>
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#include "aes_gcm.h"
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#include "alloc.h"
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#include "err.h" /* for srtp_debug */
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#include "crypto_types.h"
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#include "cipher_types.h"
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srtp_debug_module_t srtp_mod_aes_gcm = {
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0, /* debugging is off by default */
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"aes gcm" /* printable module name */
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};
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/*
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* For now we only support 8 and 16 octet tags. The spec allows for
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* optional 12 byte tag, which may be supported in the future.
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*/
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#define GCM_AUTH_TAG_LEN 16
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#define GCM_AUTH_TAG_LEN_8 8
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/*
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* This function allocates a new instance of this crypto engine.
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* The key_len parameter should be one of 28 or 44 for
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* AES-128-GCM or AES-256-GCM respectively. Note that the
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* key length includes the 14 byte salt value that is used when
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* initializing the KDF.
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*/
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static srtp_err_status_t srtp_aes_gcm_openssl_alloc(srtp_cipher_t **c,
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int key_len,
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int tlen)
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{
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srtp_aes_gcm_ctx_t *gcm;
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debug_print(srtp_mod_aes_gcm, "allocating cipher with key length %d",
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key_len);
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debug_print(srtp_mod_aes_gcm, "allocating cipher with tag length %d", tlen);
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/*
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* Verify the key_len is valid for one of: AES-128/256
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*/
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if (key_len != SRTP_AES_GCM_128_KEY_LEN_WSALT &&
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key_len != SRTP_AES_GCM_256_KEY_LEN_WSALT) {
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return (srtp_err_status_bad_param);
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}
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if (tlen != GCM_AUTH_TAG_LEN && tlen != GCM_AUTH_TAG_LEN_8) {
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return (srtp_err_status_bad_param);
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}
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/* allocate memory a cipher of type aes_gcm */
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*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
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if (*c == NULL) {
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return (srtp_err_status_alloc_fail);
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}
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gcm = (srtp_aes_gcm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_gcm_ctx_t));
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if (gcm == NULL) {
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srtp_crypto_free(*c);
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*c = NULL;
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return (srtp_err_status_alloc_fail);
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}
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gcm->ctx = EVP_CIPHER_CTX_new();
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if (gcm->ctx == NULL) {
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srtp_crypto_free(gcm);
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srtp_crypto_free(*c);
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*c = NULL;
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return srtp_err_status_alloc_fail;
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}
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/* set pointers */
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(*c)->state = gcm;
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/* setup cipher attributes */
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switch (key_len) {
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case SRTP_AES_GCM_128_KEY_LEN_WSALT:
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(*c)->type = &srtp_aes_gcm_128;
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(*c)->algorithm = SRTP_AES_GCM_128;
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gcm->key_size = SRTP_AES_128_KEY_LEN;
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gcm->tag_len = tlen;
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break;
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case SRTP_AES_GCM_256_KEY_LEN_WSALT:
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(*c)->type = &srtp_aes_gcm_256;
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(*c)->algorithm = SRTP_AES_GCM_256;
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gcm->key_size = SRTP_AES_256_KEY_LEN;
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gcm->tag_len = tlen;
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break;
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}
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/* set key size */
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(*c)->key_len = key_len;
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return (srtp_err_status_ok);
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}
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/*
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* This function deallocates a GCM session
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*/
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static srtp_err_status_t srtp_aes_gcm_openssl_dealloc(srtp_cipher_t *c)
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{
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srtp_aes_gcm_ctx_t *ctx;
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ctx = (srtp_aes_gcm_ctx_t *)c->state;
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if (ctx) {
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EVP_CIPHER_CTX_free(ctx->ctx);
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/* zeroize the key material */
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octet_string_set_to_zero(ctx, sizeof(srtp_aes_gcm_ctx_t));
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srtp_crypto_free(ctx);
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}
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/* free memory */
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srtp_crypto_free(c);
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return (srtp_err_status_ok);
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}
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/*
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* aes_gcm_openssl_context_init(...) initializes the aes_gcm_context
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* using the value in key[].
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*
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* the key is the secret key
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*/
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static srtp_err_status_t srtp_aes_gcm_openssl_context_init(void *cv,
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const uint8_t *key)
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{
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srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
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const EVP_CIPHER *evp;
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c->dir = srtp_direction_any;
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debug_print(srtp_mod_aes_gcm, "key: %s",
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srtp_octet_string_hex_string(key, c->key_size));
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switch (c->key_size) {
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case SRTP_AES_256_KEY_LEN:
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evp = EVP_aes_256_gcm();
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break;
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case SRTP_AES_128_KEY_LEN:
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evp = EVP_aes_128_gcm();
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break;
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default:
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return (srtp_err_status_bad_param);
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break;
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}
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EVP_CIPHER_CTX_cleanup(c->ctx);
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if (!EVP_CipherInit_ex(c->ctx, evp, NULL, key, NULL, 0)) {
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return (srtp_err_status_init_fail);
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}
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return (srtp_err_status_ok);
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}
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/*
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* aes_gcm_openssl_set_iv(c, iv) sets the counter value to the exor of iv with
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* the offset
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*/
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static srtp_err_status_t srtp_aes_gcm_openssl_set_iv(
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void *cv,
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uint8_t *iv,
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srtp_cipher_direction_t direction)
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{
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srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
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if (direction != srtp_direction_encrypt &&
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direction != srtp_direction_decrypt) {
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return (srtp_err_status_bad_param);
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}
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c->dir = direction;
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debug_print(srtp_mod_aes_gcm, "setting iv: %s",
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srtp_octet_string_hex_string(iv, 12));
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if (!EVP_CIPHER_CTX_ctrl(c->ctx, EVP_CTRL_GCM_SET_IVLEN, 12, 0)) {
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return (srtp_err_status_init_fail);
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}
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if (!EVP_CipherInit_ex(c->ctx, NULL, NULL, NULL, iv,
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(c->dir == srtp_direction_encrypt ? 1 : 0))) {
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return (srtp_err_status_init_fail);
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}
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return (srtp_err_status_ok);
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}
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/*
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* This function processes the AAD
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*
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* Parameters:
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* c Crypto context
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* aad Additional data to process for AEAD cipher suites
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* aad_len length of aad buffer
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*/
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static srtp_err_status_t srtp_aes_gcm_openssl_set_aad(void *cv,
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const uint8_t *aad,
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uint32_t aad_len)
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{
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srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
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int rv;
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debug_print(srtp_mod_aes_gcm, "setting AAD: %s",
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srtp_octet_string_hex_string(aad, aad_len));
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/*
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* Set dummy tag, OpenSSL requires the Tag to be set before
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* processing AAD
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*/
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/*
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* OpenSSL never write to address pointed by the last parameter of
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* EVP_CIPHER_CTX_ctrl while EVP_CTRL_GCM_SET_TAG (in reality,
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* OpenSSL copy its content to the context), so we can make
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* aad read-only in this function and all its wrappers.
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*/
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unsigned char dummy_tag[GCM_AUTH_TAG_LEN];
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memset(dummy_tag, 0x0, GCM_AUTH_TAG_LEN);
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EVP_CIPHER_CTX_ctrl(c->ctx, EVP_CTRL_GCM_SET_TAG, c->tag_len, &dummy_tag);
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rv = EVP_Cipher(c->ctx, NULL, aad, aad_len);
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if (rv != aad_len) {
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return (srtp_err_status_algo_fail);
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} else {
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return (srtp_err_status_ok);
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}
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}
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/*
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* This function encrypts a buffer using AES GCM mode
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*
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* Parameters:
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* c Crypto context
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* buf data to encrypt
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* enc_len length of encrypt buffer
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*/
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static srtp_err_status_t srtp_aes_gcm_openssl_encrypt(void *cv,
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unsigned char *buf,
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unsigned int *enc_len)
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{
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srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
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if (c->dir != srtp_direction_encrypt && c->dir != srtp_direction_decrypt) {
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return (srtp_err_status_bad_param);
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}
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/*
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* Encrypt the data
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*/
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EVP_Cipher(c->ctx, buf, buf, *enc_len);
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return (srtp_err_status_ok);
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}
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/*
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* This function calculates and returns the GCM tag for a given context.
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* This should be called after encrypting the data. The *len value
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* is increased by the tag size. The caller must ensure that *buf has
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* enough room to accept the appended tag.
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*
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* Parameters:
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* c Crypto context
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* buf data to encrypt
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* len length of encrypt buffer
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*/
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static srtp_err_status_t srtp_aes_gcm_openssl_get_tag(void *cv,
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uint8_t *buf,
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uint32_t *len)
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{
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srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
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/*
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* Calculate the tag
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*/
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EVP_Cipher(c->ctx, NULL, NULL, 0);
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/*
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* Retreive the tag
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*/
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EVP_CIPHER_CTX_ctrl(c->ctx, EVP_CTRL_GCM_GET_TAG, c->tag_len, buf);
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/*
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* Increase encryption length by desired tag size
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*/
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*len = c->tag_len;
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return (srtp_err_status_ok);
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}
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/*
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* This function decrypts a buffer using AES GCM mode
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*
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* Parameters:
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* c Crypto context
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* buf data to encrypt
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* enc_len length of encrypt buffer
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*/
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static srtp_err_status_t srtp_aes_gcm_openssl_decrypt(void *cv,
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unsigned char *buf,
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unsigned int *enc_len)
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{
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srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
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if (c->dir != srtp_direction_encrypt && c->dir != srtp_direction_decrypt) {
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return (srtp_err_status_bad_param);
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}
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/*
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* Set the tag before decrypting
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*/
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EVP_CIPHER_CTX_ctrl(c->ctx, EVP_CTRL_GCM_SET_TAG, c->tag_len,
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buf + (*enc_len - c->tag_len));
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EVP_Cipher(c->ctx, buf, buf, *enc_len - c->tag_len);
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/*
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* Check the tag
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*/
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if (EVP_Cipher(c->ctx, NULL, NULL, 0)) {
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return (srtp_err_status_auth_fail);
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}
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/*
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* Reduce the buffer size by the tag length since the tag
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* is not part of the original payload
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*/
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*enc_len -= c->tag_len;
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return (srtp_err_status_ok);
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}
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/*
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* Name of this crypto engine
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*/
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static const char srtp_aes_gcm_128_openssl_description[] =
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"AES-128 GCM using openssl";
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static const char srtp_aes_gcm_256_openssl_description[] =
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"AES-256 GCM using openssl";
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/*
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* KAT values for AES self-test. These
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* values we're derived from independent test code
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* using OpenSSL.
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*/
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/* clang-format off */
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static const uint8_t srtp_aes_gcm_test_case_0_key[SRTP_AES_GCM_128_KEY_LEN_WSALT] = {
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0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
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0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
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0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
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0x09, 0x0a, 0x0b, 0x0c,
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};
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/* clang-format on */
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/* clang-format off */
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static uint8_t srtp_aes_gcm_test_case_0_iv[12] = {
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0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
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0xde, 0xca, 0xf8, 0x88
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};
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/* clang-format on */
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/* clang-format off */
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static const uint8_t srtp_aes_gcm_test_case_0_plaintext[60] = {
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0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5,
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0xa5, 0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a,
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0x86, 0xa7, 0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda,
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0x2e, 0x4c, 0x30, 0x3d, 0x8a, 0x31, 0x8a, 0x72,
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0x1c, 0x3c, 0x0c, 0x95, 0x95, 0x68, 0x09, 0x53,
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0x2f, 0xcf, 0x0e, 0x24, 0x49, 0xa6, 0xb5, 0x25,
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0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d, 0xe6, 0x57,
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0xba, 0x63, 0x7b, 0x39
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};
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/* clang-format off */
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static const uint8_t srtp_aes_gcm_test_case_0_aad[20] = {
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0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
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0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
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0xab, 0xad, 0xda, 0xd2
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};
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/* clang-format on */
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/* clang-format off */
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static const uint8_t srtp_aes_gcm_test_case_0_ciphertext[76] = {
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0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24,
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0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c,
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0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0,
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0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e,
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0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c,
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0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05,
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0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97,
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0x3d, 0x58, 0xe0, 0x91,
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/* the last 16 bytes are the tag */
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0x5b, 0xc9, 0x4f, 0xbc, 0x32, 0x21, 0xa5, 0xdb,
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0x94, 0xfa, 0xe9, 0x5a, 0xe7, 0x12, 0x1a, 0x47,
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};
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/* clang-format on */
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static const srtp_cipher_test_case_t srtp_aes_gcm_test_case_0a = {
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SRTP_AES_GCM_128_KEY_LEN_WSALT, /* octets in key */
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srtp_aes_gcm_test_case_0_key, /* key */
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srtp_aes_gcm_test_case_0_iv, /* packet index */
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60, /* octets in plaintext */
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srtp_aes_gcm_test_case_0_plaintext, /* plaintext */
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68, /* octets in ciphertext */
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srtp_aes_gcm_test_case_0_ciphertext, /* ciphertext + tag */
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20, /* octets in AAD */
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srtp_aes_gcm_test_case_0_aad, /* AAD */
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GCM_AUTH_TAG_LEN_8, /* */
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NULL /* pointer to next testcase */
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};
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static const srtp_cipher_test_case_t srtp_aes_gcm_test_case_0 = {
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SRTP_AES_GCM_128_KEY_LEN_WSALT, /* octets in key */
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srtp_aes_gcm_test_case_0_key, /* key */
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srtp_aes_gcm_test_case_0_iv, /* packet index */
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60, /* octets in plaintext */
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srtp_aes_gcm_test_case_0_plaintext, /* plaintext */
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76, /* octets in ciphertext */
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srtp_aes_gcm_test_case_0_ciphertext, /* ciphertext + tag */
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20, /* octets in AAD */
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srtp_aes_gcm_test_case_0_aad, /* AAD */
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GCM_AUTH_TAG_LEN, /* */
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&srtp_aes_gcm_test_case_0a /* pointer to next testcase */
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};
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/* clang-format off */
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static const uint8_t srtp_aes_gcm_test_case_1_key[SRTP_AES_GCM_256_KEY_LEN_WSALT] = {
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0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
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0xa5, 0x59, 0x09, 0xc5, 0x54, 0x66, 0x93, 0x1c,
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0xaf, 0xf5, 0x26, 0x9a, 0x21, 0xd5, 0x14, 0xb2,
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0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
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0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
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0x09, 0x0a, 0x0b, 0x0c,
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};
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/* clang-format on */
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/* clang-format off */
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static uint8_t srtp_aes_gcm_test_case_1_iv[12] = {
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0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
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0xde, 0xca, 0xf8, 0x88
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};
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/* clang-format on */
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|
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/* clang-format off */
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static const uint8_t srtp_aes_gcm_test_case_1_plaintext[60] = {
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0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5,
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0xa5, 0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a,
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0x86, 0xa7, 0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda,
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0x2e, 0x4c, 0x30, 0x3d, 0x8a, 0x31, 0x8a, 0x72,
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0x1c, 0x3c, 0x0c, 0x95, 0x95, 0x68, 0x09, 0x53,
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0x2f, 0xcf, 0x0e, 0x24, 0x49, 0xa6, 0xb5, 0x25,
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0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d, 0xe6, 0x57,
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0xba, 0x63, 0x7b, 0x39
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};
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/* clang-format on */
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|
|
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/* clang-format off */
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static const uint8_t srtp_aes_gcm_test_case_1_aad[20] = {
|
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0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
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0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
|
|
0xab, 0xad, 0xda, 0xd2
|
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};
|
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/* clang-format on */
|
|
|
|
/* clang-format off */
|
|
static const uint8_t srtp_aes_gcm_test_case_1_ciphertext[76] = {
|
|
0x0b, 0x11, 0xcf, 0xaf, 0x68, 0x4d, 0xae, 0x46,
|
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0xc7, 0x90, 0xb8, 0x8e, 0xb7, 0x6a, 0x76, 0x2a,
|
|
0x94, 0x82, 0xca, 0xab, 0x3e, 0x39, 0xd7, 0x86,
|
|
0x1b, 0xc7, 0x93, 0xed, 0x75, 0x7f, 0x23, 0x5a,
|
|
0xda, 0xfd, 0xd3, 0xe2, 0x0e, 0x80, 0x87, 0xa9,
|
|
0x6d, 0xd7, 0xe2, 0x6a, 0x7d, 0x5f, 0xb4, 0x80,
|
|
0xef, 0xef, 0xc5, 0x29, 0x12, 0xd1, 0xaa, 0x10,
|
|
0x09, 0xc9, 0x86, 0xc1,
|
|
/* the last 16 bytes are the tag */
|
|
0x45, 0xbc, 0x03, 0xe6, 0xe1, 0xac, 0x0a, 0x9f,
|
|
0x81, 0xcb, 0x8e, 0x5b, 0x46, 0x65, 0x63, 0x1d,
|
|
};
|
|
/* clang-format on */
|
|
|
|
static const srtp_cipher_test_case_t srtp_aes_gcm_test_case_1a = {
|
|
SRTP_AES_GCM_256_KEY_LEN_WSALT, /* octets in key */
|
|
srtp_aes_gcm_test_case_1_key, /* key */
|
|
srtp_aes_gcm_test_case_1_iv, /* packet index */
|
|
60, /* octets in plaintext */
|
|
srtp_aes_gcm_test_case_1_plaintext, /* plaintext */
|
|
68, /* octets in ciphertext */
|
|
srtp_aes_gcm_test_case_1_ciphertext, /* ciphertext + tag */
|
|
20, /* octets in AAD */
|
|
srtp_aes_gcm_test_case_1_aad, /* AAD */
|
|
GCM_AUTH_TAG_LEN_8, /* */
|
|
NULL /* pointer to next testcase */
|
|
};
|
|
|
|
static const srtp_cipher_test_case_t srtp_aes_gcm_test_case_1 = {
|
|
SRTP_AES_GCM_256_KEY_LEN_WSALT, /* octets in key */
|
|
srtp_aes_gcm_test_case_1_key, /* key */
|
|
srtp_aes_gcm_test_case_1_iv, /* packet index */
|
|
60, /* octets in plaintext */
|
|
srtp_aes_gcm_test_case_1_plaintext, /* plaintext */
|
|
76, /* octets in ciphertext */
|
|
srtp_aes_gcm_test_case_1_ciphertext, /* ciphertext + tag */
|
|
20, /* octets in AAD */
|
|
srtp_aes_gcm_test_case_1_aad, /* AAD */
|
|
GCM_AUTH_TAG_LEN, /* */
|
|
&srtp_aes_gcm_test_case_1a /* pointer to next testcase */
|
|
};
|
|
|
|
/*
|
|
* This is the vector function table for this crypto engine.
|
|
*/
|
|
const srtp_cipher_type_t srtp_aes_gcm_128 = {
|
|
srtp_aes_gcm_openssl_alloc,
|
|
srtp_aes_gcm_openssl_dealloc,
|
|
srtp_aes_gcm_openssl_context_init,
|
|
srtp_aes_gcm_openssl_set_aad,
|
|
srtp_aes_gcm_openssl_encrypt,
|
|
srtp_aes_gcm_openssl_decrypt,
|
|
srtp_aes_gcm_openssl_set_iv,
|
|
srtp_aes_gcm_openssl_get_tag,
|
|
srtp_aes_gcm_128_openssl_description,
|
|
&srtp_aes_gcm_test_case_0,
|
|
SRTP_AES_GCM_128
|
|
};
|
|
|
|
/*
|
|
* This is the vector function table for this crypto engine.
|
|
*/
|
|
const srtp_cipher_type_t srtp_aes_gcm_256 = {
|
|
srtp_aes_gcm_openssl_alloc,
|
|
srtp_aes_gcm_openssl_dealloc,
|
|
srtp_aes_gcm_openssl_context_init,
|
|
srtp_aes_gcm_openssl_set_aad,
|
|
srtp_aes_gcm_openssl_encrypt,
|
|
srtp_aes_gcm_openssl_decrypt,
|
|
srtp_aes_gcm_openssl_set_iv,
|
|
srtp_aes_gcm_openssl_get_tag,
|
|
srtp_aes_gcm_256_openssl_description,
|
|
&srtp_aes_gcm_test_case_1,
|
|
SRTP_AES_GCM_256
|
|
};
|