mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
146 lines
3.3 KiB
V
146 lines
3.3 KiB
V
// 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 md5 implements the MD5 hash algorithm as defined in RFC 1321.
|
|
|
|
// MD5 is cryptographically broken and should not be used for secure
|
|
// applications.
|
|
|
|
// Based off: https://github.com/golang/go/blob/master/src/crypto/md5
|
|
// Last commit: https://github.com/golang/go/commit/ed7f323c8f4f6bc61a75146bf34f5b8f73063a17
|
|
|
|
module md5
|
|
|
|
import encoding.binary
|
|
|
|
const (
|
|
// The size of an MD5 checksum in bytes.
|
|
Size = 16
|
|
// The blocksize of MD5 in bytes.
|
|
BlockSize = 64
|
|
)
|
|
|
|
const (
|
|
Init0 = 0x67452301
|
|
Init1 = 0xEFCDAB89
|
|
Init2 = 0x98BADCFE
|
|
Init3 = 0x10325476
|
|
)
|
|
|
|
// Digest represents the partial evaluation of a checksum.
|
|
struct Digest {
|
|
mut:
|
|
s []u32
|
|
x []byte
|
|
nx int
|
|
len u64
|
|
}
|
|
|
|
fn (d mut Digest) reset() {
|
|
d.s = [u32(0); 4]
|
|
d.x = [byte(0); BlockSize]
|
|
d.s[0] = u32(Init0)
|
|
d.s[1] = u32(Init1)
|
|
d.s[2] = u32(Init2)
|
|
d.s[3] = u32(Init3)
|
|
d.nx = 0
|
|
d.len = u64(0)
|
|
}
|
|
|
|
// new returns a new Digest (implementing hash.Hash) computing the MD5 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.right(d.nx), p)
|
|
d.nx += n
|
|
if d.nx == BlockSize {
|
|
block(mut d, d.x)
|
|
d.nx = 0
|
|
}
|
|
if n >= p.len {
|
|
p = []byte
|
|
} else {
|
|
p = p.right(n)
|
|
}
|
|
}
|
|
if p.len >= BlockSize {
|
|
n := p.len &~ (BlockSize - 1)
|
|
block(mut d, p.left(n))
|
|
if n >= p.len {
|
|
p = []byte
|
|
} else {
|
|
p = p.right(n)
|
|
}
|
|
}
|
|
if p.len > 0 {
|
|
d.nx = copy(d.x, p)
|
|
}
|
|
return nn
|
|
}
|
|
|
|
pub fn (d &Digest) sum(b_in mut []byte) []byte {
|
|
// Make a copy of d so that caller can keep writing and summing.
|
|
mut d0 := *d
|
|
hash := d0.checksum()
|
|
for b in hash {
|
|
b_in << b
|
|
}
|
|
return *b_in
|
|
}
|
|
|
|
pub fn (d mut Digest) checksum() []byte {
|
|
// Append 0x80 to the end of the message and then append zeros
|
|
// until the length is a multiple of 56 bytes. Finally append
|
|
// 8 bytes representing the message length in bits.
|
|
//
|
|
// 1 byte end marker :: 0-63 padding bytes :: 8 byte length
|
|
// tmp := [1 + 63 + 8]byte{0x80}
|
|
mut tmp := [byte(0); 1 + 63 + 8]
|
|
tmp[0] = 0x80
|
|
pad := (55 - int(d.len)) % 64 // calculate number of padding bytes
|
|
binary.little_endian_put_u64(mut tmp.right(1+pad), u64(d.len<<u64(3))) // append length in bits
|
|
d.write(tmp.left(1+pad+8))
|
|
|
|
// The previous write ensures that a whole number of
|
|
// blocks (i.e. a multiple of 64 bytes) have been hashed.
|
|
if d.nx != 0 {
|
|
panic('d.nx != 0')
|
|
}
|
|
|
|
digest := [byte(0); Size]
|
|
|
|
binary.little_endian_put_u32(mut digest, d.s[0])
|
|
binary.little_endian_put_u32(mut digest.right(4), d.s[1])
|
|
binary.little_endian_put_u32(mut digest.right(8), d.s[2])
|
|
binary.little_endian_put_u32(mut digest.right(12), d.s[3])
|
|
return digest
|
|
}
|
|
|
|
// sum returns the MD5 checksum of the data.
|
|
pub fn sum(data []byte) []byte {
|
|
mut d := new()
|
|
d.write(data)
|
|
return d.checksum()
|
|
}
|
|
|
|
fn block(dig mut 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 BlockSize }
|
|
|
|
pub fn hexhash(s string) string { return sum(s.bytes()).hex() }
|