gotosocial/vendor/github.com/minio/sha256-simd/sha256.go
Dominik Süß 9d0df426da
[feature] S3 support (#674)
* feat: vendor minio client

* feat: introduce storage package with s3 support

* feat: serve s3 files directly

this saves a lot of bandwith as the files are fetched from the object
store directly

* fix: use explicit local storage in tests

* feat: integrate s3 storage with the main server

* fix: add s3 config to cli tests

* docs: explicitly set values in example config

also adds license header to the storage package

* fix: use better http status code on s3 redirect

HTTP 302 Found is the best fit, as it signifies that the resource
requested was found but not under its presumed URL

307/TemporaryRedirect would mean that this resource is usually located
here, not in this case

303/SeeOther indicates that the redirection does not link to the
requested resource but to another page

* refactor: use context in storage driver interface
2022-07-03 12:08:30 +02:00

410 lines
7.4 KiB
Go

/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package sha256
import (
"crypto/sha256"
"encoding/binary"
"hash"
"runtime"
)
// Size - The size of a SHA256 checksum in bytes.
const Size = 32
// BlockSize - The blocksize of SHA256 in bytes.
const BlockSize = 64
const (
chunk = BlockSize
init0 = 0x6A09E667
init1 = 0xBB67AE85
init2 = 0x3C6EF372
init3 = 0xA54FF53A
init4 = 0x510E527F
init5 = 0x9B05688C
init6 = 0x1F83D9AB
init7 = 0x5BE0CD19
)
// digest represents the partial evaluation of a checksum.
type digest struct {
h [8]uint32
x [chunk]byte
nx int
len uint64
}
// Reset digest back to default
func (d *digest) Reset() {
d.h[0] = init0
d.h[1] = init1
d.h[2] = init2
d.h[3] = init3
d.h[4] = init4
d.h[5] = init5
d.h[6] = init6
d.h[7] = init7
d.nx = 0
d.len = 0
}
type blockfuncType int
const (
blockfuncGeneric blockfuncType = iota
blockfuncAvx512 blockfuncType = iota
blockfuncAvx2 blockfuncType = iota
blockfuncAvx blockfuncType = iota
blockfuncSsse blockfuncType = iota
blockfuncSha blockfuncType = iota
blockfuncArm blockfuncType = iota
)
var blockfunc blockfuncType
func init() {
is386bit := runtime.GOARCH == "386"
isARM := runtime.GOARCH == "arm"
switch {
case is386bit || isARM:
blockfunc = blockfuncGeneric
case sha && ssse3 && sse41:
blockfunc = blockfuncSha
case avx2:
blockfunc = blockfuncAvx2
case avx:
blockfunc = blockfuncAvx
case ssse3:
blockfunc = blockfuncSsse
case armSha:
blockfunc = blockfuncArm
default:
blockfunc = blockfuncGeneric
}
}
// New returns a new hash.Hash computing the SHA256 checksum.
func New() hash.Hash {
if blockfunc != blockfuncGeneric {
d := new(digest)
d.Reset()
return d
}
// Fallback to the standard golang implementation
// if no features were found.
return sha256.New()
}
// Sum256 - single caller sha256 helper
func Sum256(data []byte) (result [Size]byte) {
var d digest
d.Reset()
d.Write(data)
result = d.checkSum()
return
}
// Return size of checksum
func (d *digest) Size() int { return Size }
// Return blocksize of checksum
func (d *digest) BlockSize() int { return BlockSize }
// Write to digest
func (d *digest) Write(p []byte) (nn int, err error) {
nn = len(p)
d.len += uint64(nn)
if d.nx > 0 {
n := copy(d.x[d.nx:], p)
d.nx += n
if d.nx == chunk {
block(d, d.x[:])
d.nx = 0
}
p = p[n:]
}
if len(p) >= chunk {
n := len(p) &^ (chunk - 1)
block(d, p[:n])
p = p[n:]
}
if len(p) > 0 {
d.nx = copy(d.x[:], p)
}
return
}
// Return sha256 sum in bytes
func (d *digest) Sum(in []byte) []byte {
// Make a copy of d0 so that caller can keep writing and summing.
d0 := *d
hash := d0.checkSum()
return append(in, hash[:]...)
}
// Intermediate checksum function
func (d *digest) checkSum() (digest [Size]byte) {
n := d.nx
var k [64]byte
copy(k[:], d.x[:n])
k[n] = 0x80
if n >= 56 {
block(d, k[:])
// clear block buffer - go compiles this to optimal 1x xorps + 4x movups
// unfortunately expressing this more succinctly results in much worse code
k[0] = 0
k[1] = 0
k[2] = 0
k[3] = 0
k[4] = 0
k[5] = 0
k[6] = 0
k[7] = 0
k[8] = 0
k[9] = 0
k[10] = 0
k[11] = 0
k[12] = 0
k[13] = 0
k[14] = 0
k[15] = 0
k[16] = 0
k[17] = 0
k[18] = 0
k[19] = 0
k[20] = 0
k[21] = 0
k[22] = 0
k[23] = 0
k[24] = 0
k[25] = 0
k[26] = 0
k[27] = 0
k[28] = 0
k[29] = 0
k[30] = 0
k[31] = 0
k[32] = 0
k[33] = 0
k[34] = 0
k[35] = 0
k[36] = 0
k[37] = 0
k[38] = 0
k[39] = 0
k[40] = 0
k[41] = 0
k[42] = 0
k[43] = 0
k[44] = 0
k[45] = 0
k[46] = 0
k[47] = 0
k[48] = 0
k[49] = 0
k[50] = 0
k[51] = 0
k[52] = 0
k[53] = 0
k[54] = 0
k[55] = 0
k[56] = 0
k[57] = 0
k[58] = 0
k[59] = 0
k[60] = 0
k[61] = 0
k[62] = 0
k[63] = 0
}
binary.BigEndian.PutUint64(k[56:64], uint64(d.len)<<3)
block(d, k[:])
{
const i = 0
binary.BigEndian.PutUint32(digest[i*4:i*4+4], d.h[i])
}
{
const i = 1
binary.BigEndian.PutUint32(digest[i*4:i*4+4], d.h[i])
}
{
const i = 2
binary.BigEndian.PutUint32(digest[i*4:i*4+4], d.h[i])
}
{
const i = 3
binary.BigEndian.PutUint32(digest[i*4:i*4+4], d.h[i])
}
{
const i = 4
binary.BigEndian.PutUint32(digest[i*4:i*4+4], d.h[i])
}
{
const i = 5
binary.BigEndian.PutUint32(digest[i*4:i*4+4], d.h[i])
}
{
const i = 6
binary.BigEndian.PutUint32(digest[i*4:i*4+4], d.h[i])
}
{
const i = 7
binary.BigEndian.PutUint32(digest[i*4:i*4+4], d.h[i])
}
return
}
func block(dig *digest, p []byte) {
if blockfunc == blockfuncSha {
blockShaGo(dig, p)
} else if blockfunc == blockfuncAvx2 {
blockAvx2Go(dig, p)
} else if blockfunc == blockfuncAvx {
blockAvxGo(dig, p)
} else if blockfunc == blockfuncSsse {
blockSsseGo(dig, p)
} else if blockfunc == blockfuncArm {
blockArmGo(dig, p)
} else if blockfunc == blockfuncGeneric {
blockGeneric(dig, p)
}
}
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
}
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,
}