warg_crypto/signing/
signature.rs

1use super::{SignatureAlgorithm, SignatureAlgorithmParseError};
2use base64::{engine::general_purpose::STANDARD, Engine};
3use core::fmt;
4use p256;
5use serde::{Deserialize, Serialize};
6use signature::Error as SignatureError;
7use std::str::FromStr;
8use thiserror::Error;
9
10#[derive(Clone, Debug, PartialEq, Eq)]
11pub enum Signature {
12    P256(p256::ecdsa::Signature),
13}
14
15impl Signature {
16    /// Get the signature algorithm used to create this signature
17    pub fn signature_algorithm(&self) -> SignatureAlgorithm {
18        match self {
19            Signature::P256(_) => SignatureAlgorithm::EcdsaP256,
20        }
21    }
22
23    /// Get the signature's representation as bytes (not including an algorithm specifier)
24    pub fn bytes(&self) -> Vec<u8> {
25        match self {
26            Signature::P256(key) => key.to_der().to_bytes().to_vec(),
27        }
28    }
29}
30
31impl fmt::Display for Signature {
32    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
33        write!(
34            f,
35            "{}:{}",
36            self.signature_algorithm(),
37            STANDARD.encode(self.bytes())
38        )
39    }
40}
41
42impl FromStr for Signature {
43    type Err = SignatureParseError;
44
45    fn from_str(s: &str) -> Result<Self, Self::Err> {
46        let parts: Vec<&str> = s.split(|c| c == ':').collect();
47        if parts.len() != 2 {
48            return Err(SignatureParseError::IncorrectStructure(parts.len()));
49        }
50        let algo = parts[0].parse::<SignatureAlgorithm>()?;
51        let bytes = STANDARD.decode(parts[1])?;
52
53        let sig = match algo {
54            SignatureAlgorithm::EcdsaP256 => {
55                Signature::P256(p256::ecdsa::Signature::from_der(&bytes)?)
56            }
57        };
58
59        Ok(sig)
60    }
61}
62
63impl Serialize for Signature {
64    fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
65        serializer.serialize_str(&self.to_string())
66    }
67}
68
69impl<'de> Deserialize<'de> for Signature {
70    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
71    where
72        D: serde::Deserializer<'de>,
73    {
74        let string: String = String::deserialize(deserializer)?;
75        Self::from_str(&string).map_err(serde::de::Error::custom)
76    }
77}
78
79#[derive(Error, Debug)]
80pub enum SignatureParseError {
81    #[error("expected 2 parts, found {0}")]
82    IncorrectStructure(usize),
83
84    #[error("unable to parse signature algorithm")]
85    SignatureAlgorithmParseError(#[from] SignatureAlgorithmParseError),
86
87    #[error("base64 decode failed")]
88    Base64DecodeError(#[from] base64::DecodeError),
89
90    #[error("signature could not be constructed from bytes")]
91    SignatureError(#[from] SignatureError),
92}
warg_crypto/signing/signature.rs

warg_crypto/signing/
signature.rs
