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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
use std::borrow::Cow;
use serde::{Serialize, Deserialize};
use rlp::RlpStream;
use tiny_keccak::keccak256 as keccak;
use impl_serde::serialize as bytes;
pub use ethereum_types::{Address, U256};
#[derive(Serialize, Deserialize, Debug, Hash, PartialOrd, Ord, PartialEq, Eq, Clone)]
pub struct Bytes(#[serde(with="bytes")] pub Vec<u8>);
impl From<Vec<u8>> for Bytes {
fn from(s: Vec<u8>) -> Self { Bytes(s) }
}
impl std::ops::Deref for Bytes {
type Target = [u8];
fn deref(&self) -> &[u8] { &self.0[..] }
}
#[derive(Serialize, Deserialize, Clone, PartialEq, Eq, Hash, Debug)]
#[serde(rename_all="camelCase")]
pub struct Transaction {
pub from: Address,
pub to: Option<Address>,
pub nonce: U256,
pub gas: U256,
pub gas_price: U256,
pub value: U256,
pub data: Bytes,
}
#[derive(Serialize, Deserialize, Clone, PartialEq, Eq, Hash, Debug)]
#[serde(rename_all="camelCase")]
pub struct SignTransaction<'a> {
pub transaction: Cow<'a, Transaction>,
pub chain_id: u64,
}
impl<'a> SignTransaction<'a> {
pub fn hash(&self) -> [u8; 32] {
SignedTransaction {
transaction: Cow::Borrowed(&*self.transaction),
v: self.chain_id,
r: 0.into(),
s: 0.into()
}.hash()
}
}
#[derive(Serialize, Deserialize)]
#[serde(rename_all="camelCase")]
pub struct SignedTransaction<'a> {
pub transaction: Cow<'a, Transaction>,
pub v: u64,
pub r: U256,
pub s: U256,
}
impl<'a> rlp::Decodable for SignedTransaction<'a> {
fn decode(d: &rlp::Rlp) -> Result<Self, rlp::DecoderError> {
if d.item_count()? != 9 {
return Err(rlp::DecoderError::RlpIncorrectListLen);
}
Ok(SignedTransaction {
transaction: Cow::Owned(Transaction {
nonce: d.val_at(0)?,
gas_price: d.val_at(1)?,
gas: d.val_at(2)?,
to: d.val_at(3)?,
from: Default::default(),
value: d.val_at(4)?,
data: d.val_at::<Vec<u8>>(5)?.into(),
}),
v: d.val_at(6)? ,
r: d.val_at(7)?,
s: d.val_at(8)?,
})
}
}
impl<'a> rlp::Encodable for SignedTransaction<'a> {
fn rlp_append(&self, s: &mut RlpStream) {
s.begin_list(9);
s.append(&self.transaction.nonce);
s.append(&self.transaction.gas_price);
s.append(&self.transaction.gas);
match self.transaction.to.as_ref() {
None => s.append(&""),
Some(addr) => s.append(addr),
};
s.append(&self.transaction.value);
s.append(&self.transaction.data.0);
s.append(&self.v);
s.append(&self.r);
s.append(&self.s);
}
}
impl<'a> SignedTransaction<'a> {
pub fn new(
transaction: Cow<'a, Transaction>,
chain_id: u64,
v: u8,
r: [u8; 32],
s: [u8; 32],
) -> Self {
let v = replay_protection::add(v, chain_id);
let r = U256::from_big_endian(&r);
let s = U256::from_big_endian(&s);
Self {
transaction: transaction.into(),
v,
r,
s,
}
}
pub fn standard_v(&self) -> u8 {
match self.v {
v if v == 27 => 0,
v if v == 28 => 1,
v if v >= 35 => ((v - 1) % 2) as u8,
_ => 4
}
}
pub fn chain_id(&self) -> Option<u64> {
replay_protection::chain_id(self.v)
}
pub fn hash(&self) -> [u8; 32] {
self.with_rlp(|s| keccak(s.as_raw()))
}
pub fn bare_hash(&self) -> [u8; 32] {
let chain_id = self.chain_id().unwrap_or_default();
SignTransaction {
transaction: std::borrow::Cow::Borrowed(&self.transaction),
chain_id,
}.hash()
}
pub fn to_rlp(&self) -> Vec<u8> {
self.with_rlp(|s| s.drain())
}
fn with_rlp<R>(&self, f: impl FnOnce(RlpStream) -> R) -> R {
let mut s = RlpStream::new();
rlp::Encodable::rlp_append(self, &mut s);
f(s)
}
}
mod replay_protection {
pub fn add(v: u8, chain_id: u64) -> u64 {
v as u64 + 35 + chain_id * 2
}
pub fn chain_id(v: u64) -> Option<u64> {
match v {
v if v >= 35 => Some((v - 35) / 2),
_ => None
}
}
}