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
61
62
63
64
65
|
//! `crypt(3)` Base64 encoding for sha* family.
use super::{Alphabet, DecodeStep, EncodeStep};
/// `crypt(3)` Base64 encoding for the following schemes.
/// * sha1_crypt,
/// * sha256_crypt,
/// * sha512_crypt,
/// * md5_crypt
///
/// ```text
/// [.-9] [A-Z] [a-z]
/// 0x2e-0x39, 0x41-0x5a, 0x61-0x7a
/// ```
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct Base64ShaCrypt;
impl Alphabet for Base64ShaCrypt {
const BASE: u8 = b'.';
const DECODER: &'static [DecodeStep] = &[
DecodeStep::Range(b'.'..=b'9', -45),
DecodeStep::Range(b'A'..=b'Z', -52),
DecodeStep::Range(b'a'..=b'z', -58),
];
const ENCODER: &'static [EncodeStep] =
&[EncodeStep::Apply(b'9', 7), EncodeStep::Apply(b'Z', 6)];
const PADDED: bool = false;
type Unpadded = Self;
#[inline(always)]
fn decode_3bytes(src: &[u8], dst: &mut [u8]) -> i16 {
debug_assert_eq!(src.len(), 4);
debug_assert!(dst.len() >= 3, "dst too short: {}", dst.len());
let c0 = Self::decode_6bits(src[0]);
let c1 = Self::decode_6bits(src[1]);
let c2 = Self::decode_6bits(src[2]);
let c3 = Self::decode_6bits(src[3]);
dst[0] = (c0 | ((c1 & 0x3) << 6)) as u8;
dst[1] = ((c1 >> 2) | ((c2 & 0xF) << 4)) as u8;
dst[2] = ((c2 >> 4) | (c3 << 2)) as u8;
((c0 | c1 | c2 | c3) >> 8) & 1
}
#[inline(always)]
fn encode_3bytes(src: &[u8], dst: &mut [u8]) {
debug_assert_eq!(src.len(), 3);
debug_assert!(dst.len() >= 4, "dst too short: {}", dst.len());
let b0 = src[0] as i16;
let b1 = src[1] as i16;
let b2 = src[2] as i16;
dst[0] = Self::encode_6bits(b0 & 63);
dst[1] = Self::encode_6bits(((b1 << 2) | (b0 >> 6)) & 63);
dst[2] = Self::encode_6bits(((b2 << 4) | (b1 >> 4)) & 63);
dst[3] = Self::encode_6bits(b2 >> 2);
}
}
|
