v/vlib/crypto/sha1/sha1.v

152 lines
3.1 KiB
V
Raw Normal View History

2019-07-15 17:49:01 +02:00
// Copyright (c) 2019 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.
2019-07-16 14:20:51 +02:00
2019-07-15 17:49:01 +02:00
// SHA-1 is cryptographically broken and should not be used for secure
// applications.
2019-07-16 14:20:51 +02:00
// Based off: https://github.com/golang/go/blob/master/src/crypto/sha1
// Last commit: https://github.com/golang/go/commit/3ce865d7a0b88714cc433454ae2370a105210c01
2019-07-16 14:20:51 +02:00
2019-07-15 17:49:01 +02:00
module sha1
import encoding.binary
const(
// The size of a SHA-1 checksum in bytes.
Size = 20
// The blocksize of SHA-1 in bytes.
BlockSize = 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)
2019-07-15 17:49:01 +02:00
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
2019-07-15 17:49:01 +02:00
}
2019-07-17 11:00:15 +02:00
// new returns a new Digest (implementing hash.Hash) computing the SHA1 checksum.
2019-07-15 17:49:01 +02:00
pub fn new() &Digest {
mut d := &Digest{}
d.reset()
return d
}
2019-08-07 13:37:07 +02:00
pub fn (d mut Digest) write(p_ []byte) ?int {
mut p := p_
2019-07-15 17:49:01 +02:00
nn := p.len
d.len += u64(nn)
if d.nx > 0 {
2019-07-29 16:33:35 +02:00
n := copy(d.x.right(d.nx), p)
2019-07-15 17:49:01 +02:00
d.nx += n
if d.nx == Chunk {
2019-07-17 11:00:15 +02:00
block(d, d.x)
2019-07-15 17:49:01 +02:00
d.nx = 0
}
if n >= p.len {
p = []byte
} else {
p = p.right(n)
}
}
if p.len >= Chunk {
n := p.len &~ (Chunk - 1)
2019-07-17 11:00:15 +02:00
block(d, p.left(n))
2019-07-15 17:49:01 +02:00
if n >= p.len {
p = []byte
} else {
p = p.right(n)
}
}
if p.len > 0 {
2019-07-29 16:33:35 +02:00
d.nx = copy(d.x, p)
2019-07-15 17:49:01 +02:00
}
return nn
}
2019-09-29 15:44:52 +02:00
pub fn (d &Digest) sum(b_in []byte) []byte {
2019-07-15 17:49:01 +02:00
// Make a copy of d so that caller can keep writing and summing.
mut d0 := *d
2019-07-16 14:20:51 +02:00
hash := d0.checksum()
2019-09-29 15:44:52 +02:00
mut b_out := b_in.clone()
2019-07-15 17:49:01 +02:00
for b in hash {
2019-09-29 15:44:52 +02:00
b_out << b
2019-07-15 17:49:01 +02:00
}
2019-09-29 15:44:52 +02:00
return b_out
2019-07-15 17:49:01 +02:00
}
2019-07-16 14:20:51 +02:00
fn (d mut Digest) checksum() []byte {
2019-07-15 17:49:01 +02:00
mut len := d.len
// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
mut tmp := [byte(0)].repeat(64)
2019-07-15 17:49:01 +02:00
tmp[0] = 0x80
if int(len)%64 < 56 {
2019-08-07 13:37:07 +02:00
d.write(tmp.left(56-int(len)%64))
2019-07-15 17:49:01 +02:00
} else {
2019-08-07 13:37:07 +02:00
d.write(tmp.left(64+56-int(len)%64))
2019-07-15 17:49:01 +02:00
}
// Length in bits.
len <<= 3
2019-08-07 09:53:33 +02:00
binary.big_endian_put_u64(mut tmp, len)
2019-08-07 13:37:07 +02:00
d.write(tmp.left(8))
2019-07-15 17:49:01 +02:00
mut digest := [byte(0)].repeat(Size)
2019-07-15 17:49:01 +02:00
2019-08-07 09:53:33 +02:00
binary.big_endian_put_u32(mut digest, d.h[0])
binary.big_endian_put_u32(mut digest.right(4), d.h[1])
binary.big_endian_put_u32(mut digest.right(8), d.h[2])
binary.big_endian_put_u32(mut digest.right(12), d.h[3])
binary.big_endian_put_u32(mut digest.right(16), d.h[4])
2019-07-15 17:49:01 +02:00
return digest
}
// Sum returns the SHA-1 checksum of the data.
pub fn sum(data []byte) []byte {
2019-07-16 14:20:51 +02:00
mut d := new()
2019-08-07 13:37:07 +02:00
d.write(data)
2019-07-16 14:20:51 +02:00
return d.checksum()
2019-07-15 17:49:01 +02:00
}
2019-07-17 11:00:15 +02:00
fn block(dig &Digest, p []byte) {
// For now just use block_generic until we have specific
2019-07-17 11:00:15 +02:00
// architecture optimized versions
2019-08-07 13:37:07 +02:00
block_generic(mut dig, p)
2019-07-17 11:00:15 +02:00
}
2019-07-15 17:49:01 +02:00
pub fn (d &Digest) size() int { return Size }
2019-07-16 17:59:07 +02:00
pub fn (d &Digest) block_size() int { return BlockSize }
2019-09-02 19:22:19 +02:00
pub fn hexhash(s string) string { return sum(s.bytes()).hex() }