1/* Copyright (c) (2011,2014-2016,2018,2019,2021) Apple Inc. All rights reserved.
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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 */
45void
46ccmode_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), b: I, c: I);
64#endif
65}
66