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
#[cfg(feature = "arithmetic")]
use crate::SignatureSize;
#[cfg(feature = "arithmetic")]
use core::borrow::Borrow;
#[cfg(feature = "arithmetic")]
use elliptic_curve::{ff::PrimeField, ops::Invert, FieldBytes, ProjectiveArithmetic, Scalar};
#[cfg(feature = "arithmetic")]
use signature::Error;
#[cfg(feature = "digest")]
use crate::CheckSignatureBytes;
#[cfg(feature = "digest")]
use signature::{digest::Digest, PrehashSignature};
#[cfg(any(feature = "arithmetic", feature = "digest"))]
use crate::Signature;
#[cfg(any(feature = "arithmetic", feature = "digest"))]
use elliptic_curve::{generic_array::ArrayLength, weierstrass::Curve};
#[cfg(feature = "arithmetic")]
#[cfg_attr(docsrs, doc(cfg(feature = "arithmetic")))]
pub trait SignPrimitive<C>
where
C: Curve + ProjectiveArithmetic,
FieldBytes<C>: From<Scalar<C>> + for<'r> From<&'r Scalar<C>>,
Scalar<C>: PrimeField<Repr = FieldBytes<C>>,
SignatureSize<C>: ArrayLength<u8>,
{
fn try_sign_prehashed<K: Borrow<Scalar<C>> + Invert<Output = Scalar<C>>>(
&self,
ephemeral_scalar: &K,
hashed_msg: &Scalar<C>,
) -> Result<Signature<C>, Error>;
}
#[cfg(feature = "arithmetic")]
#[cfg_attr(docsrs, doc(cfg(feature = "arithmetic")))]
pub trait RecoverableSignPrimitive<C>
where
C: Curve + ProjectiveArithmetic,
FieldBytes<C>: From<Scalar<C>> + for<'r> From<&'r Scalar<C>>,
Scalar<C>: PrimeField<Repr = FieldBytes<C>>,
SignatureSize<C>: ArrayLength<u8>,
{
fn try_sign_recoverable_prehashed<K: Borrow<Scalar<C>> + Invert<Output = Scalar<C>>>(
&self,
ephemeral_scalar: &K,
hashed_msg: &Scalar<C>,
) -> Result<(Signature<C>, bool), Error>;
}
#[cfg(feature = "arithmetic")]
impl<C, T> SignPrimitive<C> for T
where
C: Curve + ProjectiveArithmetic,
T: RecoverableSignPrimitive<C>,
FieldBytes<C>: From<Scalar<C>> + for<'r> From<&'r Scalar<C>>,
Scalar<C>: PrimeField<Repr = FieldBytes<C>>,
SignatureSize<C>: ArrayLength<u8>,
{
fn try_sign_prehashed<K: Borrow<Scalar<C>> + Invert<Output = Scalar<C>>>(
&self,
ephemeral_scalar: &K,
hashed_msg: &Scalar<C>,
) -> Result<Signature<C>, Error> {
self.try_sign_recoverable_prehashed(ephemeral_scalar, hashed_msg)
.map(|res| res.0)
}
}
#[cfg(feature = "arithmetic")]
#[cfg_attr(docsrs, doc(cfg(feature = "arithmetic")))]
pub trait VerifyPrimitive<C>
where
C: Curve + ProjectiveArithmetic,
FieldBytes<C>: From<Scalar<C>> + for<'r> From<&'r Scalar<C>>,
Scalar<C>: PrimeField<Repr = FieldBytes<C>>,
SignatureSize<C>: ArrayLength<u8>,
{
fn verify_prehashed(
&self,
hashed_msg: &Scalar<C>,
signature: &Signature<C>,
) -> Result<(), Error>;
}
#[cfg(feature = "digest")]
#[cfg_attr(docsrs, doc(cfg(feature = "digest")))]
pub trait DigestPrimitive: Curve {
type Digest: Digest;
}
#[cfg(feature = "digest")]
impl<C> PrehashSignature for Signature<C>
where
C: DigestPrimitive + CheckSignatureBytes,
<C::FieldSize as core::ops::Add>::Output: ArrayLength<u8>,
{
type Digest = C::Digest;
}