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Source file src/crypto/sha512/sha512block.go

Documentation: crypto/sha512

  // Copyright 2009 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // SHA512 block step.
  // In its own file so that a faster assembly or C version
  // can be substituted easily.
  
  package sha512
  
  var _K = []uint64{
  	0x428a2f98d728ae22,
  	0x7137449123ef65cd,
  	0xb5c0fbcfec4d3b2f,
  	0xe9b5dba58189dbbc,
  	0x3956c25bf348b538,
  	0x59f111f1b605d019,
  	0x923f82a4af194f9b,
  	0xab1c5ed5da6d8118,
  	0xd807aa98a3030242,
  	0x12835b0145706fbe,
  	0x243185be4ee4b28c,
  	0x550c7dc3d5ffb4e2,
  	0x72be5d74f27b896f,
  	0x80deb1fe3b1696b1,
  	0x9bdc06a725c71235,
  	0xc19bf174cf692694,
  	0xe49b69c19ef14ad2,
  	0xefbe4786384f25e3,
  	0x0fc19dc68b8cd5b5,
  	0x240ca1cc77ac9c65,
  	0x2de92c6f592b0275,
  	0x4a7484aa6ea6e483,
  	0x5cb0a9dcbd41fbd4,
  	0x76f988da831153b5,
  	0x983e5152ee66dfab,
  	0xa831c66d2db43210,
  	0xb00327c898fb213f,
  	0xbf597fc7beef0ee4,
  	0xc6e00bf33da88fc2,
  	0xd5a79147930aa725,
  	0x06ca6351e003826f,
  	0x142929670a0e6e70,
  	0x27b70a8546d22ffc,
  	0x2e1b21385c26c926,
  	0x4d2c6dfc5ac42aed,
  	0x53380d139d95b3df,
  	0x650a73548baf63de,
  	0x766a0abb3c77b2a8,
  	0x81c2c92e47edaee6,
  	0x92722c851482353b,
  	0xa2bfe8a14cf10364,
  	0xa81a664bbc423001,
  	0xc24b8b70d0f89791,
  	0xc76c51a30654be30,
  	0xd192e819d6ef5218,
  	0xd69906245565a910,
  	0xf40e35855771202a,
  	0x106aa07032bbd1b8,
  	0x19a4c116b8d2d0c8,
  	0x1e376c085141ab53,
  	0x2748774cdf8eeb99,
  	0x34b0bcb5e19b48a8,
  	0x391c0cb3c5c95a63,
  	0x4ed8aa4ae3418acb,
  	0x5b9cca4f7763e373,
  	0x682e6ff3d6b2b8a3,
  	0x748f82ee5defb2fc,
  	0x78a5636f43172f60,
  	0x84c87814a1f0ab72,
  	0x8cc702081a6439ec,
  	0x90befffa23631e28,
  	0xa4506cebde82bde9,
  	0xbef9a3f7b2c67915,
  	0xc67178f2e372532b,
  	0xca273eceea26619c,
  	0xd186b8c721c0c207,
  	0xeada7dd6cde0eb1e,
  	0xf57d4f7fee6ed178,
  	0x06f067aa72176fba,
  	0x0a637dc5a2c898a6,
  	0x113f9804bef90dae,
  	0x1b710b35131c471b,
  	0x28db77f523047d84,
  	0x32caab7b40c72493,
  	0x3c9ebe0a15c9bebc,
  	0x431d67c49c100d4c,
  	0x4cc5d4becb3e42b6,
  	0x597f299cfc657e2a,
  	0x5fcb6fab3ad6faec,
  	0x6c44198c4a475817,
  }
  
  func blockGeneric(dig *digest, p []byte) {
  	var w [80]uint64
  	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]
  	for len(p) >= chunk {
  		for i := 0; i < 16; i++ {
  			j := i * 8
  			w[i] = uint64(p[j])<<56 | uint64(p[j+1])<<48 | uint64(p[j+2])<<40 | uint64(p[j+3])<<32 |
  				uint64(p[j+4])<<24 | uint64(p[j+5])<<16 | uint64(p[j+6])<<8 | uint64(p[j+7])
  		}
  		for i := 16; i < 80; i++ {
  			v1 := w[i-2]
  			t1 := (v1>>19 | v1<<(64-19)) ^ (v1>>61 | v1<<(64-61)) ^ (v1 >> 6)
  			v2 := w[i-15]
  			t2 := (v2>>1 | v2<<(64-1)) ^ (v2>>8 | v2<<(64-8)) ^ (v2 >> 7)
  
  			w[i] = t1 + w[i-7] + t2 + w[i-16]
  		}
  
  		a, b, c, d, e, f, g, h := h0, h1, h2, h3, h4, h5, h6, h7
  
  		for i := 0; i < 80; i++ {
  			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]
  
  			t2 := ((a>>28 | a<<(64-28)) ^ (a>>34 | a<<(64-34)) ^ (a>>39 | a<<(64-39))) + ((a & b) ^ (a & c) ^ (b & c))
  
  			h = g
  			g = f
  			f = e
  			e = d + t1
  			d = c
  			c = b
  			b = a
  			a = t1 + t2
  		}
  
  		h0 += a
  		h1 += b
  		h2 += c
  		h3 += d
  		h4 += e
  		h5 += f
  		h6 += g
  		h7 += h
  
  		p = p[chunk:]
  	}
  
  	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
  }
  

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