dat 1.1.3

DAT - Data Access Token
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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155

use std::fmt::Display;
use crate::error::DatError;
use crate::signature_algorithm::SignatureAlgorithm;
use ecdsa::signature::Verifier;

#[repr(u8)]
#[derive(Clone, Copy, PartialEq)]
pub enum SignatureKeyOutOption {
    FULL,
    SIGNING,
    VERIFYING,
}

impl SignatureKeyOutOption {
    pub fn to_str(&self) -> &'static str {
        match self {
            SignatureKeyOutOption::FULL => "FULL",
            SignatureKeyOutOption::SIGNING => "SIGNING",
            SignatureKeyOutOption::VERIFYING => "VERIFYING",
        }
    }
}

impl Display for SignatureKeyOutOption {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(self.to_str())
    }
}

pub enum SignatureKey {
    P256(Option<p256::ecdsa::SigningKey>, p256::ecdsa::VerifyingKey),
    P384(Option<p384::ecdsa::SigningKey>, p384::ecdsa::VerifyingKey),
    P521(Option<p521::ecdsa::SigningKey>, p521::ecdsa::VerifyingKey),
}

impl SignatureKey {
    pub fn generate(algorithm: SignatureAlgorithm) -> Self {
        match algorithm {
            SignatureAlgorithm::P256 => {
                let signing_key = <p256::ecdsa::SigningKey as p256::elliptic_curve::Generate>::generate();
                let verifying_key = *signing_key.verifying_key();
                SignatureKey::P256(Some(signing_key), verifying_key)
            },
            SignatureAlgorithm::P384 => {
                let signing_key = <p384::ecdsa::SigningKey as p384::elliptic_curve::Generate>::generate();
                let verifying_key = *signing_key.verifying_key();
                SignatureKey::P384(Some(signing_key), verifying_key)
            },
            SignatureAlgorithm::P521 => {
                let signing_key = <p521::ecdsa::SigningKey as p521::elliptic_curve::Generate>::generate();
                let verifying_key = *signing_key.verifying_key();
                SignatureKey::P521(Some(signing_key), verifying_key)
            },
        }
    }

    pub fn from_bytes(algorithm: SignatureAlgorithm, signing_key: &[u8], verifying_key: &[u8]) -> Result<SignatureKey, DatError> {
        match algorithm {
            SignatureAlgorithm::P256 => {
                let signing_key = if signing_key.is_empty() { None } else { Some(p256::ecdsa::SigningKey::from_slice(signing_key).unwrap()) };
                let verifying_key = if verifying_key.is_empty() {
                    *signing_key.as_ref().unwrap().verifying_key()
                } else {
                    p256::ecdsa::VerifyingKey::from_sec1_bytes(verifying_key).unwrap()
                };
                Ok(SignatureKey::P256(signing_key, verifying_key))
            },
            SignatureAlgorithm::P384 => {
                let signing_key = if signing_key.is_empty() { None } else { Some(p384::ecdsa::SigningKey::from_slice(signing_key).unwrap()) };
                let verifying_key = if verifying_key.is_empty() {
                    *signing_key.as_ref().unwrap().verifying_key()
                } else {
                    p384::ecdsa::VerifyingKey::from_sec1_bytes(verifying_key).unwrap()
                };
                Ok(SignatureKey::P384(signing_key, verifying_key))
            },
            SignatureAlgorithm::P521 => {
                let signing_key = if signing_key.is_empty() { None } else { Some(p521::ecdsa::SigningKey::from_slice(signing_key).unwrap()) };
                let verifying_key = if verifying_key.is_empty() {
                    *signing_key.as_ref().unwrap().verifying_key()
                } else {
                    p521::ecdsa::VerifyingKey::from_sec1_bytes(verifying_key).unwrap()
                };
                Ok(SignatureKey::P521(signing_key, verifying_key))
            },
        }
    }

    pub fn algorithm(&self) -> SignatureAlgorithm {
        match self {
            SignatureKey::P256(_, _) => SignatureAlgorithm::P256,
            SignatureKey::P384(_, _) => SignatureAlgorithm::P384,
            SignatureKey::P521(_, _) => SignatureAlgorithm::P521,
        }
    }

    pub fn signature_size(&self) -> usize {
        match self {
            SignatureKey::P256(_, _) => 64,
            SignatureKey::P384(_, _) => 96,
            SignatureKey::P521(_, _) => 132,
        }
    }

    pub fn to_bytes(&self) -> (Box<[u8]>, Box<[u8]>) {
        match self {
            SignatureKey::P256(s, v) => {
                (s.as_ref().map(|e| Box::from(e.to_bytes().as_slice())).unwrap_or(Box::from([])), v.to_sec1_bytes())
            },
            SignatureKey::P384(s, v) => {
                (s.as_ref().map(|e| Box::from(e.to_bytes().as_slice())).unwrap_or(Box::from([])), v.to_sec1_bytes())
            },
            SignatureKey::P521(s, v) => {
                (s.as_ref().map(|e| Box::from(e.to_bytes().as_slice())).unwrap_or(Box::from([])), v.to_sec1_bytes())
            },
        }
    }

    pub fn sign(&self, data: &[u8]) -> Box<[u8]> {
        match self {
            SignatureKey::P256(s, _) => {
                Box::from(&*ecdsa::signature::Signer::<p256::ecdsa::Signature>::sign(s.as_ref().unwrap(), data).to_bytes())
            },
            SignatureKey::P384(s, _) => {
                Box::from(&*ecdsa::signature::Signer::<p384::ecdsa::Signature>::sign(s.as_ref().unwrap(), data).to_bytes())
            },
            SignatureKey::P521(s, _) => {
                Box::from(&*ecdsa::signature::Signer::<p521::ecdsa::Signature>::sign(s.as_ref().unwrap(), data).to_bytes())
            },
        }
    }

    pub fn verify(&self, body: &[u8], sign: &[u8]) -> Result<(), DatError> {
        match self {
            SignatureKey::P256(_, v) => v.verify(body, &ecdsa::Signature::from_slice(sign).map_err(|_| DatError::VerifyError)?),
            SignatureKey::P384(_, v) => v.verify(body, &ecdsa::Signature::from_slice(sign).map_err(|_| DatError::VerifyError)?),
            SignatureKey::P521(_, v) => v.verify(body, &ecdsa::Signature::from_slice(sign).map_err(|_| DatError::VerifyError)?),
        }.map_err(|_| DatError::VerifyError)
    }

    pub fn signable(&self) -> bool {
        match self {
            SignatureKey::P256(s, _) => s.is_some(),
            SignatureKey::P384(s, _) => s.is_some(),
            SignatureKey::P521(s, _) => s.is_some(),
        }
    }
}

impl Clone for SignatureKey {
    fn clone(&self) -> Self {
        let (k, v) = self.to_bytes();
        SignatureKey::from_bytes(self.algorithm(), &*k, &*v).unwrap()
    }
}