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129 lines
3.5 KiB
Go
129 lines
3.5 KiB
Go
/*
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Copyright (c) 2009 The Go Authors. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// SHA256 implementation from golang/go, modified to accommodate anope's
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// password hashing scheme, which overrides the initialization vector
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// using the salt.
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package migrations
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import (
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"encoding/binary"
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)
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// The size of a SHA256 checksum in bytes.
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const Size = 32
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const (
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chunk = 64
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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]uint32
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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 (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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sha256BlockGeneric(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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sha256BlockGeneric(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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// Make a copy of d 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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func (d *digest) checkSum() [Size]byte {
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len := d.len
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// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
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var tmp [64]byte
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tmp[0] = 0x80
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if len%64 < 56 {
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d.Write(tmp[0 : 56-len%64])
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} else {
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d.Write(tmp[0 : 64+56-len%64])
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}
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// Length in bits.
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len <<= 3
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binary.BigEndian.PutUint64(tmp[:], len)
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d.Write(tmp[0:8])
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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 [Size]byte
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binary.BigEndian.PutUint32(digest[0:], d.h[0])
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binary.BigEndian.PutUint32(digest[4:], d.h[1])
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binary.BigEndian.PutUint32(digest[8:], d.h[2])
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binary.BigEndian.PutUint32(digest[12:], d.h[3])
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binary.BigEndian.PutUint32(digest[16:], d.h[4])
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binary.BigEndian.PutUint32(digest[20:], d.h[5])
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binary.BigEndian.PutUint32(digest[24:], d.h[6])
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binary.BigEndian.PutUint32(digest[28:], d.h[7])
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return digest
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}
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// Anope password hashing function: SHA-256 with an override for the IV
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// The actual SHA-256 IV for reference:
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// [8]uint32{0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19}
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func anopeSum256(data []byte, iv [8]uint32) [Size]byte {
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var d digest
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d.h = iv
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d.Write(data)
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return d.checkSum()
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}
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