saa-crypto 0.26.4

Cryprography related logic of smart account auth
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

use std::ops::Deref;
use saa_common::{Verifiable, String};


#[cfg(any(feature = "cosmwasm", feature = "native"))]
use saa_common::{
    ReplayError, MsgDataToSign, CredentialName,
    to_json_binary as to_bin
};


#[derive(Clone, Debug)]
pub enum CheckOption {
    Messages(Vec<String>),
    Text(String),
    Nothing

}

#[derive(Clone, Debug)]
pub struct ReplayParams {
    pub override_id       :  Option<String>,
    pub override_address  :  Option<String>,
    pub checking          :  CheckOption,
    pub has_inners        :  bool,
    pub nonce             :  u64,
}



impl ReplayParams {
    pub fn new(
        nonce: u64,
        opt: CheckOption,
    ) -> Self {
        if let CheckOption::Nothing = opt {
            Self {
                override_id: None,
                override_address: None,
                checking: opt,
                has_inners: false,
                nonce,
            }
        } else {
            Self {
                override_id: None,
                override_address: None,
                checking: opt,
                has_inners: true,
                nonce,
            }
        }
    }
}



pub trait ReplayProtection : Verifiable {
    
    fn message_digest(&self) -> Vec<u8> {
        self.hash_message(self.message().as_ref())
    }


    fn hash_message(&self, bytes: &[u8]) -> Vec<u8> {
        crate::hashes::sha256(bytes).into()
    }


    #[cfg(any(feature = "cosmwasm", feature = "native"))]
    fn protect_reply(
        &self,
        #[cfg(feature = "cosmwasm")]
        env: &saa_common::wasm::Env, 
        params: ReplayParams,
    ) -> Result<(), ReplayError> {
        if self.name() == CredentialName::Native { return Ok(()) };
        let chain_id = match params.override_id {
            Some(ref id) => id.clone(),
            None => {
                #[cfg(not(feature = "cosmwasm"))]
                return Err(ReplayError::MissingData("Chain ID".into()));
                #[cfg(feature = "cosmwasm")]
                env.block.chain_id.clone()
            }
        };
        let addr = match params.override_address {
            Some(ref addr) => addr.clone(),
            None => {
                #[cfg(not(feature = "cosmwasm"))]
                return Err(ReplayError::MissingData("Contract Address".into()));
                #[cfg(feature = "cosmwasm")]
                env.contract.address.to_string()
            }
        };
        let msgs = match params.checking {
            CheckOption::Messages(msgs) => msgs,
            CheckOption::Text(t) => vec![t],
            CheckOption::Nothing => vec![],
        };

        let evlp = MsgDataToSign::new(chain_id,addr,msgs,params.nonce);
        let bin = to_bin(&evlp).map_err(|_| ReplayError::ToBin("MsgDataToSign".into()))?;
        
        println!("Verifying credential: {}, envelope: {:?}", self.name(), evlp);
        println!("Data hash: {:?}", self.hash_message(&bin));
        println!("Message digest: {:?}", self.message_digest());

        if self.hash_message(&bin) != self.message_digest() {
            let orig_bin : saa_common::Binary = self.message().to_vec().into();
            return Err(ReplayError::InvalidEnvelope(bin.to_string(), orig_bin.to_string()));
        }
        Ok(())
    }
    
}



// implement for all &Credential whose enum value is ReplayProtection
impl<T> ReplayProtection for T  
    where T: Deref<Target : ReplayProtection> + Verifiable 
{

    fn hash_message(&self, bytes: &[u8]) -> Vec<u8> {
        self.deref().hash_message(bytes)
    }

    fn message_digest(&self) -> Vec<u8> {
        self.deref().message_digest()
    }

    #[cfg(any(feature = "cosmwasm", feature = "native"))]
    fn protect_reply(
        &self,
        #[cfg(feature = "cosmwasm")]
        env: &saa_common::wasm::Env, 
        params: ReplayParams,
    ) -> Result<(), saa_common::ReplayError> {
        self.deref().protect_reply(
            #[cfg(feature = "cosmwasm")]
            env,
            params,
        )
    }

}