sha512block.mx raw

   1  // Copyright 2009 The Go Authors. All rights reserved.
   2  // Use of this source code is governed by a BSD-style
   3  // license that can be found in the LICENSE file.
   4  
   5  // SHA512 block step.
   6  // In its own file so that a faster assembly or C version
   7  // can be substituted easily.
   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