mirror of
https://github.com/XTLS/REALITY.git
synced 2025-08-22 14:38:35 +00:00
4db1386622
The new implementation encodes the key schedule into the type system, which is actually nicer than what we had before. For #69536 Change-Id: Iddab62c2aae40bc2425a155443576bb9b7aafe03 Reviewed-on: https://go-review.googlesource.com/c/go/+/626836 Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Roland Shoemaker <roland@golang.org> Commit-Queue: Roland Shoemaker <roland@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Filippo Valsorda <filippo@golang.org> Reviewed-by: Daniel McCarney <daniel@binaryparadox.net>
301 lines
7.1 KiB
Go
301 lines
7.1 KiB
Go
// 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.
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// Package sha512 implements the SHA-384, SHA-512, SHA-512/224, and SHA-512/256
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// hash algorithms as defined in FIPS 180-4.
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package sha512
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import (
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// "github.com/xtls/reality/fips140"
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"github.com/xtls/reality/byteorder"
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"errors"
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)
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const (
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// size512 is the size, in bytes, of a SHA-512 checksum.
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size512 = 64
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// size224 is the size, in bytes, of a SHA-512/224 checksum.
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size224 = 28
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// size256 is the size, in bytes, of a SHA-512/256 checksum.
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size256 = 32
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// size384 is the size, in bytes, of a SHA-384 checksum.
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size384 = 48
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// blockSize is the block size, in bytes, of the SHA-512/224,
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// SHA-512/256, SHA-384 and SHA-512 hash functions.
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blockSize = 128
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)
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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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init0_224 = 0x8c3d37c819544da2
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init1_224 = 0x73e1996689dcd4d6
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init2_224 = 0x1dfab7ae32ff9c82
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init3_224 = 0x679dd514582f9fcf
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init4_224 = 0x0f6d2b697bd44da8
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init5_224 = 0x77e36f7304c48942
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init6_224 = 0x3f9d85a86a1d36c8
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init7_224 = 0x1112e6ad91d692a1
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init0_256 = 0x22312194fc2bf72c
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init1_256 = 0x9f555fa3c84c64c2
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init2_256 = 0x2393b86b6f53b151
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init3_256 = 0x963877195940eabd
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init4_256 = 0x96283ee2a88effe3
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init5_256 = 0xbe5e1e2553863992
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init6_256 = 0x2b0199fc2c85b8aa
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init7_256 = 0x0eb72ddc81c52ca2
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init0_384 = 0xcbbb9d5dc1059ed8
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init1_384 = 0x629a292a367cd507
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init2_384 = 0x9159015a3070dd17
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init3_384 = 0x152fecd8f70e5939
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init4_384 = 0x67332667ffc00b31
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init5_384 = 0x8eb44a8768581511
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init6_384 = 0xdb0c2e0d64f98fa7
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init7_384 = 0x47b5481dbefa4fa4
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)
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// Digest is a SHA-384, SHA-512, SHA-512/224, or SHA-512/256 [hash.Hash]
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// implementation.
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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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size int // size224, size256, size384, or size512
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}
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func (d *Digest) Reset() {
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switch d.size {
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case size384:
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d.h[0] = init0_384
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d.h[1] = init1_384
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d.h[2] = init2_384
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d.h[3] = init3_384
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d.h[4] = init4_384
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d.h[5] = init5_384
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d.h[6] = init6_384
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d.h[7] = init7_384
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case size224:
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d.h[0] = init0_224
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d.h[1] = init1_224
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d.h[2] = init2_224
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d.h[3] = init3_224
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d.h[4] = init4_224
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d.h[5] = init5_224
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d.h[6] = init6_224
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d.h[7] = init7_224
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case size256:
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d.h[0] = init0_256
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d.h[1] = init1_256
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d.h[2] = init2_256
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d.h[3] = init3_256
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d.h[4] = init4_256
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d.h[5] = init5_256
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d.h[6] = init6_256
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d.h[7] = init7_256
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case size512:
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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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default:
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panic("unknown size")
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}
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d.nx = 0
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d.len = 0
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}
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const (
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magic384 = "sha\x04"
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magic512_224 = "sha\x05"
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magic512_256 = "sha\x06"
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magic512 = "sha\x07"
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marshaledSize = len(magic512) + 8*8 + chunk + 8
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)
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func (d *Digest) MarshalBinary() ([]byte, error) {
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return d.AppendBinary(make([]byte, 0, marshaledSize))
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}
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func (d *Digest) AppendBinary(b []byte) ([]byte, error) {
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switch d.size {
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case size384:
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b = append(b, magic384...)
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case size224:
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b = append(b, magic512_224...)
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case size256:
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b = append(b, magic512_256...)
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case size512:
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b = append(b, magic512...)
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default:
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panic("unknown size")
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}
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b = byteorder.BEAppendUint64(b, d.h[0])
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b = byteorder.BEAppendUint64(b, d.h[1])
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b = byteorder.BEAppendUint64(b, d.h[2])
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b = byteorder.BEAppendUint64(b, d.h[3])
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b = byteorder.BEAppendUint64(b, d.h[4])
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b = byteorder.BEAppendUint64(b, d.h[5])
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b = byteorder.BEAppendUint64(b, d.h[6])
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b = byteorder.BEAppendUint64(b, d.h[7])
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b = append(b, d.x[:d.nx]...)
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b = append(b, make([]byte, len(d.x)-d.nx)...)
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b = byteorder.BEAppendUint64(b, d.len)
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return b, nil
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}
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func (d *Digest) UnmarshalBinary(b []byte) error {
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if len(b) < len(magic512) {
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return errors.New("crypto/sha512: invalid hash state identifier")
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}
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switch {
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case d.size == size384 && string(b[:len(magic384)]) == magic384:
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case d.size == size224 && string(b[:len(magic512_224)]) == magic512_224:
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case d.size == size256 && string(b[:len(magic512_256)]) == magic512_256:
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case d.size == size512 && string(b[:len(magic512)]) == magic512:
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default:
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return errors.New("crypto/sha512: invalid hash state identifier")
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}
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if len(b) != marshaledSize {
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return errors.New("crypto/sha512: invalid hash state size")
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}
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b = b[len(magic512):]
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b, d.h[0] = consumeUint64(b)
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b, d.h[1] = consumeUint64(b)
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b, d.h[2] = consumeUint64(b)
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b, d.h[3] = consumeUint64(b)
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b, d.h[4] = consumeUint64(b)
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b, d.h[5] = consumeUint64(b)
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b, d.h[6] = consumeUint64(b)
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b, d.h[7] = consumeUint64(b)
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b = b[copy(d.x[:], b):]
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b, d.len = consumeUint64(b)
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d.nx = int(d.len % chunk)
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return nil
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}
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func consumeUint64(b []byte) ([]byte, uint64) {
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return b[8:], byteorder.BEUint64(b)
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}
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// New returns a new Digest computing the SHA-512 hash.
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func New() *Digest {
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d := &Digest{size: size512}
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d.Reset()
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return d
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}
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// New512_224 returns a new Digest computing the SHA-512/224 hash.
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func New512_224() *Digest {
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d := &Digest{size: size224}
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d.Reset()
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return d
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}
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// New512_256 returns a new Digest computing the SHA-512/256 hash.
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func New512_256() *Digest {
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d := &Digest{size: size256}
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d.Reset()
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return d
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}
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// New384 returns a new Digest computing the SHA-384 hash.
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func New384() *Digest {
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d := &Digest{size: size384}
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d.Reset()
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return d
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}
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func (d *Digest) Size() int {
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return d.size
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}
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func (d *Digest) BlockSize() int { return blockSize }
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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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func (d *Digest) Sum(in []byte) []byte {
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// fips140.RecordApproved()
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// Make a copy of d so that caller can keep writing and summing.
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d0 := new(Digest)
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*d0 = *d
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hash := d0.checkSum()
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return append(in, hash[:d.size]...)
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}
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func (d *Digest) checkSum() [size512]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 + 16]byte // padding + length buffer
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tmp[0] = 0x80
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var t uint64
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if len%128 < 112 {
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t = 112 - len%128
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} else {
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t = 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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padlen := tmp[:t+16]
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// Upper 64 bits are always zero, because len variable has type uint64,
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// and tmp is already zeroed at that index, so we can skip updating it.
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// byteorder.BEPutUint64(padlen[t+0:], 0)
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byteorder.BEPutUint64(padlen[t+8:], len)
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d.Write(padlen)
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if d.nx != 0 {
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panic("d.nx != 0")
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}
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var digest [size512]byte
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byteorder.BEPutUint64(digest[0:], d.h[0])
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byteorder.BEPutUint64(digest[8:], d.h[1])
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byteorder.BEPutUint64(digest[16:], d.h[2])
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byteorder.BEPutUint64(digest[24:], d.h[3])
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byteorder.BEPutUint64(digest[32:], d.h[4])
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byteorder.BEPutUint64(digest[40:], d.h[5])
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if d.size != size384 {
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byteorder.BEPutUint64(digest[48:], d.h[6])
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byteorder.BEPutUint64(digest[56:], d.h[7])
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}
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return digest
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} |