1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module cipher
// NOTE: Implement other versions (joe-c)
// xor_bytes xors the bytes in a and b. The destination should have enough
// space, otherwise xor_bytes will panic. Returns the number of bytes xor'd.
pub fn xor_bytes(mut dst []byte, a []byte, b []byte) int {
mut n := a.len
if b.len < n {
n = b.len
}
if n == 0 {
return 0
}
safe_xor_bytes(mut dst, a, b, n)
return n
}
// safe_xor_bytes XORs the bytes in `a` and `b` into `dst` it does so `n` times.
// Please note: `n` needs to be smaller or equal than the length of `a` and `b`.
pub fn safe_xor_bytes(mut dst []byte, a []byte, b []byte, n int) {
for i in 0 .. n {
dst[i] = a[i] ^ b[i]
}
}
// xor_words XORs multiples of 4 or 8 bytes (depending on architecture.)
// The slice arguments `a` and `b` are assumed to be of equal length.
pub fn xor_words(mut dst []byte, a []byte, b []byte) {
safe_xor_bytes(mut dst, a, b, b.len)
}
|
