Botan 2.13.0 Crypto and TLS for C++11

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clmul_ssse3.cpp
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1 /*
2 * (C) 2017 Jack Lloyd
3 *
4 * Botan is released under the Simplified BSD License (see license.txt)
5 */
6
7 #include <botan/internal/clmul_ssse3.h>
8 #include <immintrin.h>
9
10 namespace Botan {
11
12 BOTAN_FUNC_ISA("ssse3")
13 void gcm_multiply_ssse3(uint8_t x[16],
14 const uint64_t HM[256],
15 const uint8_t input_bytes[], size_t blocks)
16 {
17 const __m128i BSWAP_MASK = _mm_set_epi8(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
18
19 const __m128i* HM_mm = reinterpret_cast<const __m128i*>(HM);
20
21 __m128i X = _mm_loadu_si128(reinterpret_cast<__m128i*>(x));
22 X = _mm_shuffle_epi8(X, BSWAP_MASK);
23
24 const __m128i ones = _mm_set1_epi8(-1);
25
26 for(size_t b = 0; b != blocks; ++b)
27 {
28 __m128i M = _mm_loadu_si128(reinterpret_cast<const __m128i*>(input_bytes) + b);
29 M = _mm_shuffle_epi8(M, BSWAP_MASK);
30
31 X = _mm_xor_si128(X, M);
32
33 __m128i Z = _mm_setzero_si128();
34
35 for(size_t i = 0; i != 64; i += 2)
36 {
37 const __m128i HM0 = _mm_loadu_si128(HM_mm + 2*i);
38 const __m128i HM1 = _mm_loadu_si128(HM_mm + 2*i + 1);
39 const __m128i HM2 = _mm_loadu_si128(HM_mm + 2*i + 2);
40 const __m128i HM3 = _mm_loadu_si128(HM_mm + 2*i + 3);
41
42 const __m128i XMASK1 = _mm_add_epi64(_mm_srli_epi64(X, 63), ones);
43 X = _mm_slli_epi64(X, 1);
44 const __m128i XMASK2 = _mm_add_epi64(_mm_srli_epi64(X, 63), ones);
45 X = _mm_slli_epi64(X, 1);
46
47 Z = _mm_xor_si128(Z, _mm_andnot_si128(_mm_unpackhi_epi64(XMASK1, XMASK1), HM0));
48 Z = _mm_xor_si128(Z, _mm_andnot_si128(_mm_unpacklo_epi64(XMASK1, XMASK1), HM1));
49 Z = _mm_xor_si128(Z, _mm_andnot_si128(_mm_unpackhi_epi64(XMASK2, XMASK2), HM2));
50 Z = _mm_xor_si128(Z, _mm_andnot_si128(_mm_unpacklo_epi64(XMASK2, XMASK2), HM3));
51 }
52
53 X = _mm_shuffle_epi32(Z, _MM_SHUFFLE(1, 0, 3, 2));
54 }
55
56 X = _mm_shuffle_epi8(X, BSWAP_MASK);
57 _mm_storeu_si128(reinterpret_cast<__m128i*>(x), X);
58 }
59
60 }
X
fe X
Definition: ge.cpp:27
Botan::gcm_multiply_ssse3
void gcm_multiply_ssse3(uint8_t x[16], const uint64_t HM[256], const uint8_t input_bytes[], size_t blocks)
Definition: clmul_ssse3.cpp:13
BOTAN_FUNC_ISA
#define BOTAN_FUNC_ISA(isa)
Definition: compiler.h:71
Botan
Definition: alg_id.cpp:13
Z
fe Z
Definition: ge.cpp:29