openpgp_card/ocard/data/
algo_attrs.rs

1// SPDX-FileCopyrightText: 2021 Heiko Schaefer <heiko@schaefer.name>
2// SPDX-License-Identifier: MIT OR Apache-2.0
3
4//! 4.4.3.9 Algorithm Attributes
5
6use std::convert::TryFrom;
7
8use nom::branch::alt;
9use nom::bytes::complete::tag;
10use nom::combinator::map;
11use nom::{branch, bytes::complete as bytes, number::complete as number};
12
13use crate::ocard::algorithm::{AlgorithmAttributes, Curve, EccAttributes, RsaAttributes};
14use crate::ocard::crypto::EccType;
15use crate::ocard::data::complete;
16
17fn parse_oid_cv25519(input: &[u8]) -> nom::IResult<&[u8], Curve> {
18    map(tag(Curve::Curve25519.oid()), |_| Curve::Curve25519)(input)
19}
20
21fn parse_oid_ed25519(input: &[u8]) -> nom::IResult<&[u8], Curve> {
22    map(tag(Curve::Ed25519.oid()), |_| Curve::Ed25519)(input)
23}
24
25fn parse_oid_secp256k1(input: &[u8]) -> nom::IResult<&[u8], Curve> {
26    map(tag(Curve::Secp256k1.oid()), |_| Curve::Secp256k1)(input)
27}
28
29fn parse_oid_nist256(input: &[u8]) -> nom::IResult<&[u8], Curve> {
30    map(tag(Curve::NistP256r1.oid()), |_| Curve::NistP256r1)(input)
31}
32
33fn parse_oid_nist384(input: &[u8]) -> nom::IResult<&[u8], Curve> {
34    map(tag(Curve::NistP384r1.oid()), |_| Curve::NistP384r1)(input)
35}
36
37fn parse_oid_nist521(input: &[u8]) -> nom::IResult<&[u8], Curve> {
38    map(tag(Curve::NistP521r1.oid()), |_| Curve::NistP521r1)(input)
39}
40
41fn parse_oid_brainpool_p256r1(input: &[u8]) -> nom::IResult<&[u8], Curve> {
42    map(tag(Curve::BrainpoolP256r1.oid()), |_| {
43        Curve::BrainpoolP256r1
44    })(input)
45}
46
47fn parse_oid_brainpool_p384r1(input: &[u8]) -> nom::IResult<&[u8], Curve> {
48    map(tag(Curve::BrainpoolP384r1.oid()), |_| {
49        Curve::BrainpoolP384r1
50    })(input)
51}
52
53fn parse_oid_brainpool_p512r1(input: &[u8]) -> nom::IResult<&[u8], Curve> {
54    map(tag(Curve::BrainpoolP512r1.oid()), |_| {
55        Curve::BrainpoolP512r1
56    })(input)
57}
58
59fn parse_oid_ed448(input: &[u8]) -> nom::IResult<&[u8], Curve> {
60    map(tag(Curve::Ed448.oid()), |_| Curve::Ed448)(input)
61}
62
63fn parse_oid_x448(input: &[u8]) -> nom::IResult<&[u8], Curve> {
64    map(tag(Curve::X448.oid()), |_| Curve::X448)(input)
65}
66
67fn parse_oid(input: &[u8]) -> nom::IResult<&[u8], Curve> {
68    alt((
69        parse_oid_nist256,
70        parse_oid_nist384,
71        parse_oid_nist521,
72        parse_oid_brainpool_p256r1,
73        parse_oid_brainpool_p384r1,
74        parse_oid_brainpool_p512r1,
75        parse_oid_secp256k1,
76        parse_oid_ed25519,
77        parse_oid_cv25519,
78        parse_oid_ed448,
79        parse_oid_x448,
80    ))(input)
81}
82
83fn parse_rsa(input: &[u8]) -> nom::IResult<&[u8], AlgorithmAttributes> {
84    let (input, _) = bytes::tag([0x01])(input)?;
85
86    let (input, len_n) = number::be_u16(input)?;
87    let (input, len_e) = number::be_u16(input)?;
88    let (input, import_format) = number::u8(input)?;
89
90    Ok((
91        input,
92        AlgorithmAttributes::Rsa(RsaAttributes::new(len_n, len_e, import_format)),
93    ))
94}
95
96fn parse_import_format(input: &[u8]) -> nom::IResult<&[u8], Option<u8>> {
97    let (input, b) = bytes::take(1usize)(input)?;
98    Ok((input, Some(b[0])))
99}
100
101fn default_import_format(input: &[u8]) -> nom::IResult<&[u8], Option<u8>> {
102    Ok((input, None))
103}
104
105fn parse_ecdh(input: &[u8]) -> nom::IResult<&[u8], AlgorithmAttributes> {
106    let (input, _) = bytes::tag([0x12])(input)?;
107    let (input, curve) = parse_oid(input)?;
108
109    let (input, import_format) = alt((parse_import_format, default_import_format))(input)?;
110
111    Ok((
112        input,
113        AlgorithmAttributes::Ecc(EccAttributes::new(EccType::ECDH, curve, import_format)),
114    ))
115}
116
117fn parse_ecdsa(input: &[u8]) -> nom::IResult<&[u8], AlgorithmAttributes> {
118    let (input, _) = bytes::tag([0x13])(input)?;
119    let (input, curve) = parse_oid(input)?;
120
121    let (input, import_format) = alt((parse_import_format, default_import_format))(input)?;
122
123    Ok((
124        input,
125        AlgorithmAttributes::Ecc(EccAttributes::new(EccType::ECDSA, curve, import_format)),
126    ))
127}
128
129fn parse_eddsa(input: &[u8]) -> nom::IResult<&[u8], AlgorithmAttributes> {
130    let (input, _) = bytes::tag([0x16])(input)?;
131    let (input, curve) = parse_oid(input)?;
132
133    let (input, import_format) = alt((parse_import_format, default_import_format))(input)?;
134
135    Ok((
136        input,
137        AlgorithmAttributes::Ecc(EccAttributes::new(EccType::EdDSA, curve, import_format)),
138    ))
139}
140
141pub(crate) fn parse(input: &[u8]) -> nom::IResult<&[u8], AlgorithmAttributes> {
142    branch::alt((parse_rsa, parse_ecdsa, parse_eddsa, parse_ecdh))(input)
143}
144
145impl TryFrom<&[u8]> for AlgorithmAttributes {
146    type Error = crate::Error;
147
148    fn try_from(data: &[u8]) -> Result<Self, crate::Error> {
149        complete(parse(data))
150    }
151}
152
153// Tests in algo_info cover this module
openpgp_card/ocard/data/algo_attrs.rs

openpgp_card/ocard/data/
algo_attrs.rs
