sha512block.go

     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
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