v/vlib/crypto/sha1/sha1.v

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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// 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
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// Last commit: https://github.com/golang/go/commit/3ce865d7a0b88714cc433454ae2370a105210c01
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module sha1
import encoding.binary
pub const (
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// The size of a SHA-1 checksum in bytes.
size = 20
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// The blocksize of SHA-1 in bytes.
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block_size = 64
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)
const (
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chunk = 64
init0 = 0x67452301
init1 = 0xEFCDAB89
init2 = 0x98BADCFE
init3 = 0x10325476
init4 = 0xC3D2E1F0
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)
// digest represents the partial evaluation of a checksum.
struct Digest {
mut:
h []u32
x []byte
nx int
len u64
}
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fn (mut d Digest) reset() {
d.x = []byte{len: (chunk)}
d.h = []u32{len: (5)}
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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)
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d.nx = 0
d.len = 0
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}
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// new returns a new Digest (implementing hash.Hash) computing the SHA1 checksum.
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pub fn new() &Digest {
mut d := &Digest{}
d.reset()
return d
}
// write writes the contents of `p_` to the internal hash representation.
[manualfree]
pub fn (mut d Digest) write(p_ []byte) int {
nn := p_.len
unsafe {
mut p := p_
d.len += u64(nn)
if d.nx > 0 {
n := copy(d.x[d.nx..], p)
d.nx += n
if d.nx == chunk {
block(mut d, d.x)
d.nx = 0
}
if n >= p.len {
p = []
} else {
p = p[n..]
}
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}
if p.len >= chunk {
n := p.len & ~(chunk - 1)
block(mut d, p[..n])
if n >= p.len {
p = []
} else {
p = p[n..]
}
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}
if p.len > 0 {
d.nx = copy(d.x, p)
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}
}
return nn
}
// sum returns a copy of the generated sum of the bytes in `b_in`.
pub fn (d &Digest) sum(b_in []byte) []byte {
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// Make a copy of d so that caller can keep writing and summing.
mut d0 := *d
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hash := d0.checksum()
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mut b_out := b_in.clone()
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for b in hash {
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b_out << b
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}
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return b_out
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}
// checksum returns the byte checksum of the `Digest`.
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fn (mut d Digest) checksum() []byte {
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mut len := d.len
// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
mut tmp := []byte{len: (64)}
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tmp[0] = 0x80
if int(len) % 64 < 56 {
d.write(tmp[..56 - int(len) % 64])
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} else {
d.write(tmp[..64 + 56 - int(len) % 64])
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}
// Length in bits.
len <<= 3
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binary.big_endian_put_u64(mut tmp, len)
d.write(tmp[..8])
mut digest := []byte{len: (size)}
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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])
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return digest
}
// sum returns the SHA-1 checksum of the bytes passed in `data`.
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pub fn sum(data []byte) []byte {
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mut d := new()
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d.write(data)
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return d.checksum()
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}
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fn block(mut dig Digest, p []byte) {
// For now just use block_generic until we have specific
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// architecture optimized versions
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block_generic(mut dig, p)
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}
// size returns the size of the checksum in bytes.
pub fn (d &Digest) size() int {
return size
}
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// block_size returns the block size of the checksum in bytes.
pub fn (d &Digest) block_size() int {
return block_size
}
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// hexhash returns a hexadecimal SHA1 hash sum `string` of `s`.
pub fn hexhash(s string) string {
return sum(s.bytes()).hex()
}