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

use base64::decode_config;
use borsh::{BorshDeserialize, BorshSerialize};
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use std::{
    fmt::{Display, Formatter},
    str::FromStr,
};

use super::{
    derive::{signature::SignatureDerivator, Derivator},
    error::Error,
    Derivable,
};

/// Signature based identifier
#[derive(Debug, PartialEq, Clone, Eq, Hash, BorshSerialize, BorshDeserialize, PartialOrd)]
pub struct SignatureIdentifier {
    pub derivator: SignatureDerivator,
    pub signature: Vec<u8>,
}

impl SignatureIdentifier {
    pub fn new(derivator: SignatureDerivator, signature: &[u8]) -> Self {
        Self {
            derivator,
            signature: signature.to_vec(),
        }
    }
}

impl Derivable for SignatureIdentifier {
    fn derivative(&self) -> Vec<u8> {
        self.signature.to_owned()
    }
    fn derivation_code(&self) -> String {
        self.derivator.to_str()
    }
}

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

impl FromStr for SignatureIdentifier {
    type Err = Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let code = SignatureDerivator::from_str(s)?;
        if s.len() == code.material_len() {
            Ok(Self::new(
                code,
                &decode_config(&s[code.code_len()..code.material_len()], base64::URL_SAFE)?,
            ))
        } else {
            Err(Error::SemanticError(format!(
                "Incorrect Prefix Length: {}",
                s.len()
            )))
        }
    }
}

impl Serialize for SignatureIdentifier {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(&self.to_str())
    }
}

impl<'de> Deserialize<'de> for SignatureIdentifier {
    fn deserialize<D>(deserializer: D) -> Result<SignatureIdentifier, D::Error>
    where
        D: Deserializer<'de>,
    {
        let s = <std::string::String as Deserialize>::deserialize(deserializer)?;

        SignatureIdentifier::from_str(&s).map_err(serde::de::Error::custom)
    }
}

#[cfg(test)]
mod tests {

    use std::str::FromStr;

    use super::{SignatureDerivator, SignatureIdentifier};

    use crate::identifier::KeyIdentifier;

    #[test]
    fn test_to_from_string() {
        let message = b"message";
        // Ed25519Sha512
        let si_str = "SETCkX4WX_KcMeLKdwrtN8DGD49z7gbPfYV0Ao8C-B_dcKRj-7TXmv\
        LdKNHG27GDOvgCyWzFMMI23rw2sSssHjBQ";
        let si = SignatureIdentifier::from_str(&si_str).unwrap();
        let key_str = "EYS8MQAh_m740mHnjPMm9IgY9RGojzFak6ELaTsQQZx8";
        let ki = KeyIdentifier::from_str(&key_str).unwrap();
        assert!(ki.verify(message, &si).is_ok());
        // ECDSAsecp256k1
        let sig_str = "SSRFbutVG3-KHv_Fuexdx24aukwvj_RqN9jiPt9EQyDYRWsMJ-kpcLfX7\
        CHmERmULScNSiG2l4_DDQF1qui8rEjQ";
        let si = SignatureIdentifier::from_str(&sig_str).unwrap();
        let key_str = "SBKR60N9QMBPtFhwELb4XV1MIoAoZyYpdcvracq1wEW4UfrFBNh1wYajlGe\
        07VddYGgB2YbOp4aUBWkISPgu2JkQ";
        let ki = KeyIdentifier::from_str(&key_str).unwrap();
        assert!(ki.verify(message, &si).is_ok());
    }

    #[test]
    fn test_serialize_deserialize() {
        // Ed25519Sha512
        let sig_str = "SETCkX4WX_KcMeLKdwrtN8DGD49z7gbPfYV0Ao8C-B_dcKRj-7TXmv\
        LdKNHG27GDOvgCyWzFMMI23rw2sSssHjBQ";
        println!("{}", sig_str.len());
        let si = SignatureIdentifier::from_str(sig_str).unwrap();
        let ser_si = serde_json::to_string_pretty(&si).unwrap();
        let des_si: SignatureIdentifier = serde_json::from_str(&ser_si).unwrap();
        assert_eq!(si, des_si);
        assert_eq!(si.derivator, SignatureDerivator::Ed25519Sha512);
        // ECDSAsecp256k1
        let sig_str = "SSRFbutVG3-KHv_Fuexdx24aukwvj_RqN9jiPt9EQyDYRWsMJ-kpcLfX7\
        CHmERmULScNSiG2l4_DDQF1qui8rEjQ";
        println!("{}", sig_str.len());
        let si = SignatureIdentifier::from_str(sig_str).unwrap();
        let ser_si = serde_json::to_string_pretty(&si).unwrap();
        let des_si: SignatureIdentifier = serde_json::from_str(&ser_si).unwrap();
        assert_eq!(si, des_si);
        assert_eq!(si.derivator, SignatureDerivator::ECDSAsecp256k1);
    }
}