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166 lines
3.2 KiB
166 lines
3.2 KiB
// +build linux,amd64,cgo
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file of
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// Golang project:
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// https://github.com/golang/go/blob/master/LICENSE
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// Using this part of Minio codebase under the license
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// Apache License Version 2.0 with modifications
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// Package sha512 implements the SHA512 hash algorithms as defined
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// in FIPS 180-2.
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package sha512
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import (
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"hash"
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"github.com/klauspost/cpuid"
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)
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// Size - The size of a SHA512 checksum in bytes.
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const Size = 64
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// BlockSize - The blocksize of SHA512 in bytes.
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const BlockSize = 128
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const (
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chunk = 128
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init0 = 0x6a09e667f3bcc908
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init1 = 0xbb67ae8584caa73b
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init2 = 0x3c6ef372fe94f82b
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init3 = 0xa54ff53a5f1d36f1
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init4 = 0x510e527fade682d1
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init5 = 0x9b05688c2b3e6c1f
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init6 = 0x1f83d9abfb41bd6b
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init7 = 0x5be0cd19137e2179
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)
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// digest represents the partial evaluation of a checksum.
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type digest struct {
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h [8]uint64
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x [chunk]byte
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nx int
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len uint64
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}
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func block(dig *digest, p []byte) {
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switch true {
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case cpuid.CPU.AVX2():
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blockAVX2(dig, p)
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case cpuid.CPU.AVX():
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blockAVX(dig, p)
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case cpuid.CPU.SSSE3():
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blockSSE(dig, p)
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default:
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blockGeneric(dig, p)
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}
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}
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// Reset digest to its default value
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func (d *digest) Reset() {
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d.h[0] = init0
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d.h[1] = init1
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d.h[2] = init2
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d.h[3] = init3
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d.h[4] = init4
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d.h[5] = init5
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d.h[6] = init6
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d.h[7] = init7
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d.nx = 0
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d.len = 0
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}
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// New returns a new hash.Hash computing the SHA512 checksum.
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func New() hash.Hash {
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d := new(digest)
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d.Reset()
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return d
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}
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// Sum512 - single caller sha512 helper
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func Sum512(data []byte) [Size]byte {
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var d digest
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d.Reset()
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d.Write(data)
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return d.checkSum()
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}
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// Return output array byte size
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func (d *digest) Size() int { return Size }
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// Return blockSize
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func (d *digest) BlockSize() int { return BlockSize }
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// Write blocks
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func (d *digest) Write(p []byte) (nn int, err error) {
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nn = len(p)
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d.len += uint64(nn)
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if d.nx > 0 {
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n := copy(d.x[d.nx:], p)
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d.nx += n
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if d.nx == chunk {
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block(d, d.x[:])
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d.nx = 0
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}
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p = p[n:]
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}
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if len(p) >= chunk {
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n := len(p) &^ (chunk - 1)
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block(d, p[:n])
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p = p[n:]
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}
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if len(p) > 0 {
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d.nx = copy(d.x[:], p)
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}
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return
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}
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// Calculate sha512
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func (d *digest) Sum(in []byte) []byte {
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// Make a copy of d0 so that caller can keep writing and summing.
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d0 := *d
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hash := d0.checkSum()
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return append(in, hash[:]...)
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}
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// internal checksum calculation, returns [Size]byte
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func (d *digest) checkSum() [Size]byte {
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// Padding. Add a 1 bit and 0 bits until 112 bytes mod 128.
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len := d.len
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var tmp [128]byte
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tmp[0] = 0x80
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if len%128 < 112 {
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d.Write(tmp[0 : 112-len%128])
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} else {
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d.Write(tmp[0 : 128+112-len%128])
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}
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// Length in bits.
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len <<= 3
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for i := uint(0); i < 16; i++ {
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tmp[i] = byte(len >> (120 - 8*i))
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}
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d.Write(tmp[0:16])
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if d.nx != 0 {
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panic("d.nx != 0")
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}
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h := d.h[:]
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var digest [Size]byte
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for i, s := range h {
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digest[i*8] = byte(s >> 56)
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digest[i*8+1] = byte(s >> 48)
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digest[i*8+2] = byte(s >> 40)
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digest[i*8+3] = byte(s >> 32)
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digest[i*8+4] = byte(s >> 24)
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digest[i*8+5] = byte(s >> 16)
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digest[i*8+6] = byte(s >> 8)
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digest[i*8+7] = byte(s)
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}
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return digest
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}
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