152 lines
3.0 KiB
V
152 lines
3.0 KiB
V
// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
|
|
// Use of this source code is governed by an MIT license
|
|
// that can be found in the LICENSE file.
|
|
|
|
// Package sha1 implements the SHA-1 hash algorithm as defined in RFC 3174.
|
|
|
|
// SHA-1 is cryptographically broken and should not be used for secure
|
|
// applications.
|
|
|
|
// Based off: https://github.com/golang/go/blob/master/src/crypto/sha1
|
|
// Last commit: https://github.com/golang/go/commit/3ce865d7a0b88714cc433454ae2370a105210c01
|
|
|
|
module sha1
|
|
|
|
import encoding.binary
|
|
|
|
pub const(
|
|
// The size of a SHA-1 checksum in bytes.
|
|
size = 20
|
|
// The blocksize of SHA-1 in bytes.
|
|
block_size = 64
|
|
)
|
|
|
|
const (
|
|
chunk = 64
|
|
init0 = 0x67452301
|
|
init1 = 0xEFCDAB89
|
|
init2 = 0x98BADCFE
|
|
init3 = 0x10325476
|
|
init4 = 0xC3D2E1F0
|
|
)
|
|
|
|
// digest represents the partial evaluation of a checksum.
|
|
struct Digest {
|
|
mut:
|
|
h []u32
|
|
x []byte
|
|
nx int
|
|
len u64
|
|
}
|
|
|
|
fn (d mut Digest) reset() {
|
|
d.x = [byte(0)].repeat(chunk)
|
|
d.h = [u32(0)].repeat(5)
|
|
d.h[0] = u32(init0)
|
|
d.h[1] = u32(init1)
|
|
d.h[2] = u32(init2)
|
|
d.h[3] = u32(init3)
|
|
d.h[4] = u32(init4)
|
|
d.nx = 0
|
|
d.len = 0
|
|
}
|
|
|
|
// new returns a new Digest (implementing hash.Hash) computing the SHA1 checksum.
|
|
pub fn new() &Digest {
|
|
mut d := &Digest{}
|
|
d.reset()
|
|
return d
|
|
}
|
|
|
|
pub fn (d mut Digest) write(p_ []byte) int {
|
|
mut p := p_
|
|
nn := p.len
|
|
d.len += u64(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
|
|
}
|
|
if n >= p.len {
|
|
p = []
|
|
} else {
|
|
p = p[n..]
|
|
}
|
|
}
|
|
if p.len >= chunk {
|
|
n := p.len &~ (chunk - 1)
|
|
block(d, p[..n])
|
|
if n >= p.len {
|
|
p = []
|
|
} else {
|
|
p = p[n..]
|
|
}
|
|
}
|
|
if p.len > 0 {
|
|
d.nx = copy(d.x, p)
|
|
}
|
|
return nn
|
|
}
|
|
|
|
pub fn (d &Digest) sum(b_in []byte) []byte {
|
|
// Make a copy of d so that caller can keep writing and summing.
|
|
mut d0 := *d
|
|
hash := d0.checksum()
|
|
mut b_out := b_in.clone()
|
|
for b in hash {
|
|
b_out << b
|
|
}
|
|
return b_out
|
|
}
|
|
|
|
fn (d mut Digest) checksum() []byte {
|
|
mut len := d.len
|
|
// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
|
|
mut tmp := [byte(0)].repeat(64)
|
|
|
|
tmp[0] = 0x80
|
|
|
|
if int(len)%64 < 56 {
|
|
d.write(tmp[..56-int(len)%64])
|
|
} else {
|
|
d.write(tmp[..64+56-int(len)%64])
|
|
}
|
|
|
|
// Length in bits.
|
|
len <<= 3
|
|
binary.big_endian_put_u64(mut tmp, len)
|
|
d.write(tmp[..8])
|
|
|
|
mut digest := [byte(0)].repeat(size)
|
|
|
|
binary.big_endian_put_u32(mut digest, d.h[0])
|
|
binary.big_endian_put_u32(mut digest[4..], d.h[1])
|
|
binary.big_endian_put_u32(mut digest[8..], d.h[2])
|
|
binary.big_endian_put_u32(mut digest[12..], d.h[3])
|
|
binary.big_endian_put_u32(mut digest[16..], d.h[4])
|
|
|
|
return digest
|
|
}
|
|
|
|
// Sum returns the SHA-1 checksum of the data.
|
|
pub fn sum(data []byte) []byte {
|
|
mut d := new()
|
|
d.write(data)
|
|
return d.checksum()
|
|
}
|
|
|
|
fn block(dig &Digest, p []byte) {
|
|
// For now just use block_generic until we have specific
|
|
// architecture optimized versions
|
|
block_generic(mut dig, p)
|
|
}
|
|
|
|
pub fn (d &Digest) size() int { return size }
|
|
|
|
pub fn (d &Digest) block_size() int { return block_size }
|
|
|
|
pub fn hexhash(s string) string { return sum(s.bytes()).hex() }
|