age 0.11.2

[BETA] A simple, secure, and modern encryption library.
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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129

use bech32::{FromBase32, Variant};

#[cfg(all(any(feature = "armor", feature = "cli-common"), windows))]
pub(crate) const LINE_ENDING: &str = "\r\n";
#[cfg(all(any(feature = "armor", feature = "cli-common"), not(windows)))]
pub(crate) const LINE_ENDING: &str = "\n";

pub(crate) fn parse_bech32(s: &str) -> Option<(String, Vec<u8>)> {
    bech32::decode(s).ok().and_then(|(hrp, data, variant)| {
        if let Variant::Bech32 = variant {
            Vec::from_base32(&data).ok().map(|d| (hrp, d))
        } else {
            None
        }
    })
}

pub(crate) mod read {
    use std::str::FromStr;

    use base64::{prelude::BASE64_STANDARD_NO_PAD, Engine};
    use nom::{character::complete::digit1, combinator::verify, ParseTo};

    #[cfg(feature = "ssh")]
    use nom::{
        combinator::map_res,
        error::{make_error, ErrorKind},
        multi::separated_list1,
        IResult,
    };

    #[cfg(feature = "ssh")]
    #[cfg_attr(docsrs, doc(cfg(feature = "ssh")))]
    pub(crate) fn encoded_str(
        count: usize,
        engine: impl base64::Engine,
    ) -> impl Fn(&str) -> IResult<&str, Vec<u8>> {
        use nom::bytes::streaming::take;

        // Unpadded encoded length
        let encoded_count = ((4 * count) + 2) / 3;

        move |input: &str| {
            let (i, data) = take(encoded_count)(input)?;
            match engine.decode(data) {
                Ok(decoded) => Ok((i, decoded)),
                Err(_) => Err(nom::Err::Failure(make_error(input, ErrorKind::Eof))),
            }
        }
    }

    #[cfg(feature = "ssh")]
    #[cfg_attr(docsrs, doc(cfg(feature = "ssh")))]
    pub(crate) fn str_while_encoded(
        engine: impl base64::Engine,
    ) -> impl Fn(&str) -> IResult<&str, Vec<u8>> {
        use nom::bytes::complete::take_while1;

        move |input: &str| {
            map_res(
                take_while1(|c| {
                    let c = c as u8;
                    // Substitute the character in twice after AA, so that padding
                    // characters will also be detected as a valid if allowed.
                    engine.decode_slice([65, 65, c, c], &mut [0, 0, 0]).is_ok()
                }),
                |data| engine.decode(data),
            )(input)
        }
    }

    #[cfg(feature = "ssh")]
    #[cfg_attr(docsrs, doc(cfg(feature = "ssh")))]
    pub(crate) fn wrapped_str_while_encoded(
        engine: impl Engine,
    ) -> impl Fn(&str) -> IResult<&str, Vec<u8>> {
        use nom::{bytes::streaming::take_while1, character::streaming::line_ending};

        move |input: &str| {
            map_res(
                separated_list1(
                    line_ending,
                    take_while1(|c| {
                        let c = c as u8;
                        // Substitute the character in twice after AA, so that padding
                        // characters will also be detected as a valid if allowed.
                        engine.decode_slice([65, 65, c, c], &mut [0, 0, 0]).is_ok()
                    }),
                ),
                |chunks| {
                    let data = chunks.join("");
                    engine.decode(&data)
                },
            )(input)
        }
    }

    pub(crate) fn base64_arg<A: AsRef<[u8]>, const N: usize, const B: usize>(
        arg: &A,
    ) -> Option<[u8; N]> {
        if N > B {
            return None;
        }

        let mut buf = [0; B];
        match BASE64_STANDARD_NO_PAD.decode_slice(arg, buf.as_mut()) {
            Ok(n) if n == N => Some(buf[..N].try_into().unwrap()),
            _ => None,
        }
    }

    /// Parses a decimal number composed only of digits with no leading zeros.
    pub(crate) fn decimal_digit_arg<T: FromStr>(arg: &str) -> Option<T> {
        verify::<_, _, _, (), _, _>(digit1, |n: &str| !n.starts_with('0'))(arg)
            .ok()
            .and_then(|(_, n)| n.parse_to())
    }
}

pub(crate) mod write {
    use base64::{prelude::BASE64_STANDARD_NO_PAD, Engine};
    use cookie_factory::{combinator::string, SerializeFn};
    use std::io::Write;

    pub(crate) fn encoded_data<W: Write>(data: &[u8]) -> impl SerializeFn<W> {
        let encoded = BASE64_STANDARD_NO_PAD.encode(data);
        string(encoded)
    }
}