forked from gitea/gitea
119 lines
2.1 KiB
Go
119 lines
2.1 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.
|
|
|
|
// Package md4 implements the MD4 hash algorithm as defined in RFC 1320.
|
|
package md4 // import "golang.org/x/crypto/md4"
|
|
|
|
import (
|
|
"crypto"
|
|
"hash"
|
|
)
|
|
|
|
func init() {
|
|
crypto.RegisterHash(crypto.MD4, New)
|
|
}
|
|
|
|
// The size of an MD4 checksum in bytes.
|
|
const Size = 16
|
|
|
|
// The blocksize of MD4 in bytes.
|
|
const BlockSize = 64
|
|
|
|
const (
|
|
_Chunk = 64
|
|
_Init0 = 0x67452301
|
|
_Init1 = 0xEFCDAB89
|
|
_Init2 = 0x98BADCFE
|
|
_Init3 = 0x10325476
|
|
)
|
|
|
|
// digest represents the partial evaluation of a checksum.
|
|
type digest struct {
|
|
s [4]uint32
|
|
x [_Chunk]byte
|
|
nx int
|
|
len uint64
|
|
}
|
|
|
|
func (d *digest) Reset() {
|
|
d.s[0] = _Init0
|
|
d.s[1] = _Init1
|
|
d.s[2] = _Init2
|
|
d.s[3] = _Init3
|
|
d.nx = 0
|
|
d.len = 0
|
|
}
|
|
|
|
// New returns a new hash.Hash computing the MD4 checksum.
|
|
func New() hash.Hash {
|
|
d := new(digest)
|
|
d.Reset()
|
|
return d
|
|
}
|
|
|
|
func (d *digest) Size() int { return Size }
|
|
|
|
func (d *digest) BlockSize() int { return BlockSize }
|
|
|
|
func (d *digest) Write(p []byte) (nn int, err error) {
|
|
nn = len(p)
|
|
d.len += uint64(nn)
|
|
if d.nx > 0 {
|
|
n := len(p)
|
|
if n > _Chunk-d.nx {
|
|
n = _Chunk - d.nx
|
|
}
|
|
for i := 0; i < n; i++ {
|
|
d.x[d.nx+i] = p[i]
|
|
}
|
|
d.nx += n
|
|
if d.nx == _Chunk {
|
|
_Block(d, d.x[0:])
|
|
d.nx = 0
|
|
}
|
|
p = p[n:]
|
|
}
|
|
n := _Block(d, p)
|
|
p = p[n:]
|
|
if len(p) > 0 {
|
|
d.nx = copy(d.x[:], p)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d0 *digest) Sum(in []byte) []byte {
|
|
// Make a copy of d0, so that caller can keep writing and summing.
|
|
d := new(digest)
|
|
*d = *d0
|
|
|
|
// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
|
|
len := d.len
|
|
var tmp [64]byte
|
|
tmp[0] = 0x80
|
|
if len%64 < 56 {
|
|
d.Write(tmp[0 : 56-len%64])
|
|
} else {
|
|
d.Write(tmp[0 : 64+56-len%64])
|
|
}
|
|
|
|
// Length in bits.
|
|
len <<= 3
|
|
for i := uint(0); i < 8; i++ {
|
|
tmp[i] = byte(len >> (8 * i))
|
|
}
|
|
d.Write(tmp[0:8])
|
|
|
|
if d.nx != 0 {
|
|
panic("d.nx != 0")
|
|
}
|
|
|
|
for _, s := range d.s {
|
|
in = append(in, byte(s>>0))
|
|
in = append(in, byte(s>>8))
|
|
in = append(in, byte(s>>16))
|
|
in = append(in, byte(s>>24))
|
|
}
|
|
return in
|
|
}
|