1 /* Copyright (c) (2011,2014-2016,2018,2019,2021) Apple Inc. All rights reserved.
2 *
3 * corecrypto is licensed under Apple Inc.’s Internal Use License Agreement (which
4 * is contained in the License.txt file distributed with corecrypto) and only to
5 * people who accept that license. IMPORTANT: Any license rights granted to you by
6 * Apple Inc. (if any) are limited to internal use within your organization only on
7 * devices and computers you own or control, for the sole purpose of verifying the
8 * security characteristics and correct functioning of the Apple Software. You may
9 * not, directly or indirectly, redistribute the Apple Software or any portions thereof.
10 *
11 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
12 *
13 * This file contains Original Code and/or Modifications of Original Code
14 * as defined in and that are subject to the Apple Public Source License
15 * Version 2.0 (the 'License'). You may not use this file except in
16 * compliance with the License. The rights granted to you under the License
17 * may not be used to create, or enable the creation or redistribution of,
18 * unlawful or unlicensed copies of an Apple operating system, or to
19 * circumvent, violate, or enable the circumvention or violation of, any
20 * terms of an Apple operating system software license agreement.
21 *
22 * Please obtain a copy of the License at
23 * http://www.opensource.apple.com/apsl/ and read it before using this file.
24 *
25 * The Original Code and all software distributed under the License are
26 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
27 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
28 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
30 * Please see the License for the specific language governing rights and
31 * limitations under the License.
32 *
33 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
34 */
35
36 #include "cc_runtime_config.h"
37 #include "ccaes_vng_gcm.h"
38 #include "ccmode_internal.h"
39
40 /*!
41 * GCM multiply by H
42 * @param key The GCM state which holds the H value
43 * @param I The value to multiply H by
44 */
45 void
ccmode_gcm_mult_h(ccgcm_ctx * key,unsigned char * I)46 ccmode_gcm_mult_h(ccgcm_ctx *key, unsigned char *I)
47 {
48 #if CCMODE_GCM_VNG_SPEEDUP
49 #ifdef __x86_64__
50 if (!(CC_HAS_AESNI() && CC_HAS_SupplementalSSE3())) {
51 //It can handle in and out buffers to be the same
52 ccmode_gcm_gf_mult(CCMODE_GCM_KEY_H(key), I, I);
53 return;
54 } else
55 #endif
56 {
57 // CCMODE_GCM_VNG_KEY_Htable must be the second argument. gcm_gmult() is not a general multiplier function.
58 gcm_gmult(I, CCMODE_GCM_VNG_KEY_Htable(key), I );
59 return;
60 }
61 #else
62 //It can handle in and out buffers to be the same
63 ccmode_gcm_gf_mult(CCMODE_GCM_KEY_H(key), I, I);
64 #endif
65 }
66