aligned-cmov 2.3.0

Fast constant-time conditional moves of aligned bytes
Documentation 
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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60

// Copyright (c) 2018-2023 The MobileCoin Foundation

//! Naive implementation of cmov using a branch
//! This is not secure, and is meant for testing the *correctness* of large
//! orams quickly.

use super::{A64Bytes, A8Bytes, ArrayLength};

#[inline]
pub fn cmov_u32(condition: bool, src: &u32, dest: &mut u32) {
    if condition {
        *dest = *src
    }
}

#[inline]
pub fn cmov_u64(condition: bool, src: &u64, dest: &mut u64) {
    if condition {
        *dest = *src
    }
}

#[inline]
pub fn cmov_i32(condition: bool, src: &i32, dest: &mut i32) {
    if condition {
        *dest = *src
    }
}

#[inline]
pub fn cmov_i64(condition: bool, src: &i64, dest: &mut i64) {
    if condition {
        *dest = *src
    }
}

#[inline]
pub fn cmov_usize(condition: bool, src: &usize, dest: &mut usize) {
    if condition {
        *dest = *src
    }
}

#[inline]
pub fn cmov_a8_bytes<N: ArrayLength<u8>>(condition: bool, src: &A8Bytes<N>, dest: &mut A8Bytes<N>) {
    if condition {
        *dest = src.clone()
    }
}

#[inline]
pub fn cmov_a64_bytes<N: ArrayLength<u8>>(
    condition: bool,
    src: &A64Bytes<N>,
    dest: &mut A64Bytes<N>,
) {
    if condition {
        *dest = src.clone()
    }
}