1 /*-
2 * Copyright 2018 Tarsnap Backup Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include "php_hash.h"
28 #include "php_hash_sha.h"
29
30 #if defined(PHP_HASH_INTRIN_SHA_NATIVE) || defined(PHP_HASH_INTRIN_SHA_RESOLVER)
31
32 # include <immintrin.h>
33
34 # if defined(PHP_HASH_INTRIN_SHA_RESOLVER) && defined(HAVE_FUNC_ATTRIBUTE_TARGET)
35 static __m128i be32dec_128(const uint8_t * src) __attribute__((target("ssse3")));
36 void SHA256_Transform_shani(uint32_t state[PHP_STATIC_RESTRICT 8], const uint8_t block[PHP_STATIC_RESTRICT 64]) __attribute__((target("ssse3,sha")));
37 # endif
38
39 /* Original implementation from libcperciva follows.
40 *
41 * Modified to use `PHP_STATIC_RESTRICT` for MSVC compatibility.
42 */
43
44 /**
45 * This code uses intrinsics from the following feature sets:
46 * SHANI: _mm_sha256msg1_epu32, _mm_sha256msg2_epu32, _mm_sha256rnds2_epu32
47 * SSSE3: _mm_shuffle_epi8, _mm_alignr_epi8
48 * SSE2: Everything else
49 *
50 * The SSSE3 intrinsics could be avoided at a slight cost by using a few SSE2
51 * instructions in their place; we have not done this since to our knowledge
52 * there are presently no CPUs which support the SHANI instruction set but do
53 * not support SSSE3.
54 */
55
56 /* Load 32-bit big-endian words. */
57 static __m128i
be32dec_128(const uint8_t * src)58 be32dec_128(const uint8_t * src)
59 {
60 const __m128i SHUF = _mm_set_epi8(12, 13, 14, 15, 8, 9, 10, 11,
61 4, 5, 6, 7, 0, 1, 2, 3);
62 __m128i x;
63
64 /* Load four 32-bit words. */
65 x = _mm_loadu_si128((const __m128i *)src);
66
67 /* Reverse the order of the bytes in each word. */
68 return (_mm_shuffle_epi8(x, SHUF));
69 }
70
71 /* Convert an unsigned 32-bit immediate into a signed value. */
72 #define I32(a) ((UINT32_C(a) >= UINT32_C(0x80000000)) ? \
73 -(int32_t)(UINT32_C(0xffffffff) - UINT32_C(a)) - 1 : (int32_t)INT32_C(a))
74
75 /* Load four unsigned 32-bit immediates into a vector register. */
76 #define IMM4(a, b, c, d) _mm_set_epi32(I32(a), I32(b), I32(c), I32(d))
77
78 /* Run four rounds of SHA256. */
79 #define RND4(S, W, K0, K1, K2, K3) do { \
80 __m128i M; \
81 \
82 /* Add the next four words of message schedule and round constants. */ \
83 M = _mm_add_epi32(W, IMM4(K3, K2, K1, K0)); \
84 \
85 /* Perform two rounds of SHA256, using the low two words in M. */ \
86 S[1] = _mm_sha256rnds2_epu32(S[1], S[0], M); \
87 \
88 /* Shift the two words of M down and perform the next two rounds. */ \
89 M = _mm_srli_si128(M, 8); \
90 S[0] = _mm_sha256rnds2_epu32(S[0], S[1], M); \
91 } while (0)
92
93 /* Compute the ith set of four words of message schedule. */
94 #define MSG4(W, i) do { \
95 W[(i + 0) % 4] = _mm_sha256msg1_epu32(W[(i + 0) % 4], W[(i + 1) % 4]); \
96 W[(i + 0) % 4] = _mm_add_epi32(W[(i + 0) % 4], \
97 _mm_alignr_epi8(W[(i + 3) % 4], W[(i + 2) % 4], 4)); \
98 W[(i + 0) % 4] = _mm_sha256msg2_epu32(W[(i + 0) % 4], W[(i + 3) % 4]); \
99 } while (0)
100
101 /* Perform 4 rounds of SHA256 and generate more message schedule if needed. */
102 #define RNDMSG(S, W, i, K0, K1, K2, K3) do { \
103 RND4(S, W[i % 4], K0, K1, K2, K3); \
104 if (i < 12) \
105 MSG4(W, i + 4); \
106 } while (0)
107
108 /**
109 * SHA256_Transform_shani(state, block):
110 * Compute the SHA256 block compression function, transforming ${state} using
111 * the data in ${block}. This implementation uses x86 SHANI and SSSE3
112 * instructions, and should only be used if CPUSUPPORT_X86_SHANI and _SSSE3
113 * are defined and cpusupport_x86_shani() and _ssse3() return nonzero.
114 */
115 void
SHA256_Transform_shani(uint32_t state[PHP_STATIC_RESTRICT8],const uint8_t block[PHP_STATIC_RESTRICT64])116 SHA256_Transform_shani(uint32_t state[PHP_STATIC_RESTRICT 8],
117 const uint8_t block[PHP_STATIC_RESTRICT 64])
118 {
119 __m128i S3210, S7654;
120 __m128i S0123, S4567;
121 __m128i S0145, S2367;
122 __m128i W[4];
123 __m128i S[2];
124
125 /* Load state. */
126 S3210 = _mm_loadu_si128((const __m128i *)&state[0]);
127 S7654 = _mm_loadu_si128((const __m128i *)&state[4]);
128
129 /* Shuffle the 8 32-bit values into the order we need them. */
130 S0123 = _mm_shuffle_epi32(S3210, 0x1B);
131 S4567 = _mm_shuffle_epi32(S7654, 0x1B);
132 S0145 = _mm_unpackhi_epi64(S4567, S0123);
133 S2367 = _mm_unpacklo_epi64(S4567, S0123);
134
135 /* Load input block; this is the start of the message schedule. */
136 W[0] = be32dec_128(&block[0]);
137 W[1] = be32dec_128(&block[16]);
138 W[2] = be32dec_128(&block[32]);
139 W[3] = be32dec_128(&block[48]);
140
141 /* Initialize working variables. */
142 S[0] = S0145;
143 S[1] = S2367;
144
145 /* Perform 64 rounds, 4 at a time. */
146 RNDMSG(S, W, 0, 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5);
147 RNDMSG(S, W, 1, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5);
148 RNDMSG(S, W, 2, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3);
149 RNDMSG(S, W, 3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174);
150 RNDMSG(S, W, 4, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc);
151 RNDMSG(S, W, 5, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da);
152 RNDMSG(S, W, 6, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7);
153 RNDMSG(S, W, 7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967);
154 RNDMSG(S, W, 8, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13);
155 RNDMSG(S, W, 9, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85);
156 RNDMSG(S, W, 10, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3);
157 RNDMSG(S, W, 11, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070);
158 RNDMSG(S, W, 12, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5);
159 RNDMSG(S, W, 13, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3);
160 RNDMSG(S, W, 14, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208);
161 RNDMSG(S, W, 15, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2);
162
163 /* Mix local working variables into global state. */
164 S0145 = _mm_add_epi32(S0145, S[0]);
165 S2367 = _mm_add_epi32(S2367, S[1]);
166
167 /* Shuffle state back to the original word order and store. */
168 S0123 = _mm_unpackhi_epi64(S2367, S0145);
169 S4567 = _mm_unpacklo_epi64(S2367, S0145);
170 S3210 = _mm_shuffle_epi32(S0123, 0x1B);
171 S7654 = _mm_shuffle_epi32(S4567, 0x1B);
172 _mm_storeu_si128((__m128i *)&state[0], S3210);
173 _mm_storeu_si128((__m128i *)&state[4], S7654);
174 }
175
176 #endif
177
