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