f01bcc8f62
Updates resumable hash implementation to Go 1.8 equivalent. This should be a major speedup, since it includes a number of optimizations from Go 1.7. Signed-off-by: Stephen J Day <stephen.day@docker.com>
127 lines
2.4 KiB
Go
127 lines
2.4 KiB
Go
// 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.
|
|
|
|
// SHA256 block step.
|
|
// In its own file so that a faster assembly or C version
|
|
// can be substituted easily.
|
|
|
|
package sha256
|
|
|
|
var _K = []uint32{
|
|
0x428a2f98,
|
|
0x71374491,
|
|
0xb5c0fbcf,
|
|
0xe9b5dba5,
|
|
0x3956c25b,
|
|
0x59f111f1,
|
|
0x923f82a4,
|
|
0xab1c5ed5,
|
|
0xd807aa98,
|
|
0x12835b01,
|
|
0x243185be,
|
|
0x550c7dc3,
|
|
0x72be5d74,
|
|
0x80deb1fe,
|
|
0x9bdc06a7,
|
|
0xc19bf174,
|
|
0xe49b69c1,
|
|
0xefbe4786,
|
|
0x0fc19dc6,
|
|
0x240ca1cc,
|
|
0x2de92c6f,
|
|
0x4a7484aa,
|
|
0x5cb0a9dc,
|
|
0x76f988da,
|
|
0x983e5152,
|
|
0xa831c66d,
|
|
0xb00327c8,
|
|
0xbf597fc7,
|
|
0xc6e00bf3,
|
|
0xd5a79147,
|
|
0x06ca6351,
|
|
0x14292967,
|
|
0x27b70a85,
|
|
0x2e1b2138,
|
|
0x4d2c6dfc,
|
|
0x53380d13,
|
|
0x650a7354,
|
|
0x766a0abb,
|
|
0x81c2c92e,
|
|
0x92722c85,
|
|
0xa2bfe8a1,
|
|
0xa81a664b,
|
|
0xc24b8b70,
|
|
0xc76c51a3,
|
|
0xd192e819,
|
|
0xd6990624,
|
|
0xf40e3585,
|
|
0x106aa070,
|
|
0x19a4c116,
|
|
0x1e376c08,
|
|
0x2748774c,
|
|
0x34b0bcb5,
|
|
0x391c0cb3,
|
|
0x4ed8aa4a,
|
|
0x5b9cca4f,
|
|
0x682e6ff3,
|
|
0x748f82ee,
|
|
0x78a5636f,
|
|
0x84c87814,
|
|
0x8cc70208,
|
|
0x90befffa,
|
|
0xa4506ceb,
|
|
0xbef9a3f7,
|
|
0xc67178f2,
|
|
}
|
|
|
|
func blockGeneric(dig *digest, p []byte) {
|
|
var w [64]uint32
|
|
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 {
|
|
// Can interlace the computation of w with the
|
|
// rounds below if needed for speed.
|
|
for i := 0; i < 16; i++ {
|
|
j := i * 4
|
|
w[i] = uint32(p[j])<<24 | uint32(p[j+1])<<16 | uint32(p[j+2])<<8 | uint32(p[j+3])
|
|
}
|
|
for i := 16; i < 64; i++ {
|
|
v1 := w[i-2]
|
|
t1 := (v1>>17 | v1<<(32-17)) ^ (v1>>19 | v1<<(32-19)) ^ (v1 >> 10)
|
|
v2 := w[i-15]
|
|
t2 := (v2>>7 | v2<<(32-7)) ^ (v2>>18 | v2<<(32-18)) ^ (v2 >> 3)
|
|
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 < 64; i++ {
|
|
t1 := h + ((e>>6 | e<<(32-6)) ^ (e>>11 | e<<(32-11)) ^ (e>>25 | e<<(32-25))) + ((e & f) ^ (^e & g)) + _K[i] + w[i]
|
|
|
|
t2 := ((a>>2 | a<<(32-2)) ^ (a>>13 | a<<(32-13)) ^ (a>>22 | a<<(32-22))) + ((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
|
|
}
|