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8
9 package sha512
10
11 import "math/bits"
12
13 var _K = []uint64{
14 0x428a2f98d728ae22,
15 0x7137449123ef65cd,
16 0xb5c0fbcfec4d3b2f,
17 0xe9b5dba58189dbbc,
18 0x3956c25bf348b538,
19 0x59f111f1b605d019,
20 0x923f82a4af194f9b,
21 0xab1c5ed5da6d8118,
22 0xd807aa98a3030242,
23 0x12835b0145706fbe,
24 0x243185be4ee4b28c,
25 0x550c7dc3d5ffb4e2,
26 0x72be5d74f27b896f,
27 0x80deb1fe3b1696b1,
28 0x9bdc06a725c71235,
29 0xc19bf174cf692694,
30 0xe49b69c19ef14ad2,
31 0xefbe4786384f25e3,
32 0x0fc19dc68b8cd5b5,
33 0x240ca1cc77ac9c65,
34 0x2de92c6f592b0275,
35 0x4a7484aa6ea6e483,
36 0x5cb0a9dcbd41fbd4,
37 0x76f988da831153b5,
38 0x983e5152ee66dfab,
39 0xa831c66d2db43210,
40 0xb00327c898fb213f,
41 0xbf597fc7beef0ee4,
42 0xc6e00bf33da88fc2,
43 0xd5a79147930aa725,
44 0x06ca6351e003826f,
45 0x142929670a0e6e70,
46 0x27b70a8546d22ffc,
47 0x2e1b21385c26c926,
48 0x4d2c6dfc5ac42aed,
49 0x53380d139d95b3df,
50 0x650a73548baf63de,
51 0x766a0abb3c77b2a8,
52 0x81c2c92e47edaee6,
53 0x92722c851482353b,
54 0xa2bfe8a14cf10364,
55 0xa81a664bbc423001,
56 0xc24b8b70d0f89791,
57 0xc76c51a30654be30,
58 0xd192e819d6ef5218,
59 0xd69906245565a910,
60 0xf40e35855771202a,
61 0x106aa07032bbd1b8,
62 0x19a4c116b8d2d0c8,
63 0x1e376c085141ab53,
64 0x2748774cdf8eeb99,
65 0x34b0bcb5e19b48a8,
66 0x391c0cb3c5c95a63,
67 0x4ed8aa4ae3418acb,
68 0x5b9cca4f7763e373,
69 0x682e6ff3d6b2b8a3,
70 0x748f82ee5defb2fc,
71 0x78a5636f43172f60,
72 0x84c87814a1f0ab72,
73 0x8cc702081a6439ec,
74 0x90befffa23631e28,
75 0xa4506cebde82bde9,
76 0xbef9a3f7b2c67915,
77 0xc67178f2e372532b,
78 0xca273eceea26619c,
79 0xd186b8c721c0c207,
80 0xeada7dd6cde0eb1e,
81 0xf57d4f7fee6ed178,
82 0x06f067aa72176fba,
83 0x0a637dc5a2c898a6,
84 0x113f9804bef90dae,
85 0x1b710b35131c471b,
86 0x28db77f523047d84,
87 0x32caab7b40c72493,
88 0x3c9ebe0a15c9bebc,
89 0x431d67c49c100d4c,
90 0x4cc5d4becb3e42b6,
91 0x597f299cfc657e2a,
92 0x5fcb6fab3ad6faec,
93 0x6c44198c4a475817,
94 }
95
96 func blockGeneric(dig *digest, p []byte) {
97 var w [80]uint64
98 h0, h1, h2, h3, h4, h5, h6, h7 := dig.h[0], dig.h[1], dig.h[2], dig.h[3], dig.h[4], dig.h[5], dig.h[6], dig.h[7]
99 for len(p) >= chunk {
100 for i := 0; i < 16; i++ {
101 j := i * 8
102 w[i] = uint64(p[j])<<56 | uint64(p[j+1])<<48 | uint64(p[j+2])<<40 | uint64(p[j+3])<<32 |
103 uint64(p[j+4])<<24 | uint64(p[j+5])<<16 | uint64(p[j+6])<<8 | uint64(p[j+7])
104 }
105 for i := 16; i < 80; i++ {
106 v1 := w[i-2]
107 t1 := bits.RotateLeft64(v1, -19) ^ bits.RotateLeft64(v1, -61) ^ (v1 >> 6)
108 v2 := w[i-15]
109 t2 := bits.RotateLeft64(v2, -1) ^ bits.RotateLeft64(v2, -8) ^ (v2 >> 7)
110
111 w[i] = t1 + w[i-7] + t2 + w[i-16]
112 }
113
114 a, b, c, d, e, f, g, h := h0, h1, h2, h3, h4, h5, h6, h7
115
116 for i := 0; i < 80; i++ {
117 t1 := h + (bits.RotateLeft64(e, -14) ^ bits.RotateLeft64(e, -18) ^ bits.RotateLeft64(e, -41)) + ((e & f) ^ (^e & g)) + _K[i] + w[i]
118
119 t2 := (bits.RotateLeft64(a, -28) ^ bits.RotateLeft64(a, -34) ^ bits.RotateLeft64(a, -39)) + ((a & b) ^ (a & c) ^ (b & c))
120
121 h = g
122 g = f
123 f = e
124 e = d + t1
125 d = c
126 c = b
127 b = a
128 a = t1 + t2
129 }
130
131 h0 += a
132 h1 += b
133 h2 += c
134 h3 += d
135 h4 += e
136 h5 += f
137 h6 += g
138 h7 += h
139
140 p = p[chunk:]
141 }
142
143 dig.h[0], dig.h[1], dig.h[2], dig.h[3], dig.h[4], dig.h[5], dig.h[6], dig.h[7] = h0, h1, h2, h3, h4, h5, h6, h7
144 }
145
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