libmilkyway 0.1.0

libmilkyway is a part of milkyway project providing common protocols for communicating between MilkyWay modules
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

use crate::pki::hash::{CryptoHashable, Hash, HashType};
use crate::pki::impls::{CryptoError, CryptoType};
use crate::pki::signature::Signature;
use crate::serialization::deserializable::Deserializable;
use crate::serialization::error::SerializationError;
use crate::serialization::error::SerializationError::CryptographicError;
use crate::serialization::serializable::{Serializable, Serialized};

#[derive(PartialEq, Debug)]
pub enum KeyType{
    Symmetric,
    Private,
    Public,
}

///
/// Key abstraction
///
pub trait CryptoKey: Serializable + Deserializable{
    ///
    /// Gets type of key
    ///
    /// returns: KeyType: type of key
    ///
    fn get_key_type(&self) -> KeyType;

    ///
    /// Gets algorithm type
    ///
    /// returns: CryptoType: type of encipherment algorithm
    ///
    fn get_crypto_type(&self) -> CryptoType;

    ///
    ///
    /// # Arguments
    ///
    /// * `data`: serialized data to encrypt
    ///
    /// returns: Serialized: serialized data
    ///
    fn encrypt_raw(&self, data: &Serialized) -> Result<Serialized, CryptoError>;

    ///
    /// Encrypts data and serializes it.
    ///
    /// # Arguments
    ///
    /// * `data`: Serializable data to encrypt
    ///
    /// returns: Serialized: serialized encrypted data
    ///
    #[inline]
    fn encrypt<T: Serializable>(&self, data: &T) -> Result<Serialized, CryptoError>{
        let data_serialized = data.serialize();
        self.encrypt_raw(&data_serialized)
    }

    ///
    /// Decrypts data and returns decrypted Serialized data
    ///
    /// # Arguments
    ///
    /// * `data`: &Serialized: data to decrypt and deserialize
    ///
    /// returns: T: deserialized and decrypted structure
    fn decrypt_raw(&self, data: &Serialized) -> Result<Serialized, CryptoError>;

    ///
    /// Decrypts and deserializes data
    ///
    /// # Arguments
    ///
    /// * `data`: &Serialized: data to decrypt and deserialize
    ///
    /// returns: T: deserialized and decrypted structure
    #[inline]
    fn decrypt<T: Deserializable>(&self, data: &Serialized) -> Result<T, SerializationError>{
        let decrypted_data_result = self.decrypt_raw(data);
        if decrypted_data_result.is_err(){
            return Err(CryptographicError(decrypted_data_result.err().unwrap()));
        }
        let decrypted_data = decrypted_data_result.unwrap();
        //println!("Decrypted data: {:?}", decrypted_data);
        let deserialization_result = T::from_serialized(&decrypted_data);
        if deserialization_result.is_err(){
            Err(deserialization_result.err().unwrap())
        } else {
            let (data, _) = deserialization_result.unwrap();
            Ok(data)
        }
    }

    ///
    /// Signs data with key
    ///
    ///
    /// # Template arguments
    /// * `T`: Serializable + CryptoHashable: data which can be serialized and hashed
    ///
    /// # Arguments
    /// * `data`: &T: data for which hash may be computed
    /// * `hash_type`: HashType: hashing algorithm type
    ///
    /// returns:
    fn sign<T: Serializable + CryptoHashable>(&self, data: &T, hash_type: HashType) -> Result<Signature, CryptoError>{
        let m_type = self.get_key_type();
        if m_type != KeyType::Private {
            panic!("Signing data with non-private key");
        }
        let hash = data.crypto_hash(hash_type.clone());
        let encrypted = self.encrypt(&hash);
        if encrypted.is_err(){
            return Err(encrypted.err().unwrap());
        }
        Ok(Signature {
            algorithm: hash_type,
            crypto_algorithm: self.get_crypto_type(),
            serialized_signature: encrypted.unwrap(),
        })
    }

    ///
    /// Verifies signature of data against key
    ///
    /// # Arguments
    /// * `data`: &dyn CryptoHashable: data for which hash may be computed
    /// * `signature`: the signature against data must be verified
    ///
    /// returns: bool: wether the signature is valid for data
    ///
    fn verify_signature<T: Serializable + CryptoHashable>(&self, data: &T, signature: &Signature) -> bool{
        let m_type = self.get_key_type();
        let m_crypto_type = self.get_crypto_type();
        if m_type != KeyType::Public{
            panic!("Verifying data signature with non-public key");
        }
        if m_crypto_type != signature.crypto_algorithm{
            panic!("Verifying data signature with wrong algorithm");
        }
        let data_hash = data.crypto_hash(signature.algorithm.clone());
        let original_hash = self.decrypt::<Hash>(&signature.serialized_signature);
        original_hash.unwrap() == data_hash
    }
}