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primeorder: convert hash2curve mapping directly to AffinePoint (#1404)
- Move `hash2curve::osswu` to `primeorder` - Move `hash2curve::isogeny` to `k256` - Add `AffineOsswuMap`
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‎.github/workflows/primeorder.yml

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -42,6 +42,7 @@ jobs:
4242
targets: ${{ matrix.target }}
4343
- run: cargo build --target ${{ matrix.target }} --release --no-default-features
4444
- run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc
45+
- run: cargo build --target ${{ matrix.target }} --release --no-default-features --features hash2curve
4546

4647
test:
4748
runs-on: ubuntu-latest

‎Cargo.lock

Lines changed: 1 addition & 0 deletions
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‎hash2curve/src/isogeny.rs

Lines changed: 0 additions & 58 deletions
This file was deleted.

‎hash2curve/src/lib.rs

Lines changed: 0 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -24,14 +24,10 @@
2424

2525
mod group_digest;
2626
mod hash2field;
27-
mod isogeny;
2827
mod map2curve;
2928
mod oprf;
30-
mod osswu;
3129

3230
pub use group_digest::*;
3331
pub use hash2field::*;
34-
pub use isogeny::*;
3532
pub use map2curve::*;
3633
pub use oprf::*;
37-
pub use osswu::*;

‎k256/Cargo.toml

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -27,6 +27,7 @@ hash2curve = { version = "0.14.0-rc.1", optional = true }
2727
once_cell = { version = "1.21", optional = true, default-features = false }
2828
ecdsa-core = { version = "0.17.0-rc.6", package = "ecdsa", optional = true, default-features = false, features = ["der"] }
2929
hex-literal = { version = "1", optional = true }
30+
primeorder = { version = "=0.14.0-pre.8", optional = true }
3031
serdect = { version = "0.4", optional = true, default-features = false }
3132
sha2 = { version = "0.11.0-rc.2", optional = true, default-features = false }
3233
signature = { version = "3.0.0-rc.3", optional = true }
@@ -55,7 +56,7 @@ digest = ["ecdsa-core/digest", "ecdsa-core/hazmat"]
5556
ecdh = ["arithmetic", "elliptic-curve/ecdh"]
5657
ecdsa = ["arithmetic", "ecdsa-core/signing", "ecdsa-core/verifying", "sha256"]
5758
expose-field = ["arithmetic"]
58-
hash2curve = ["arithmetic", "dep:hash2curve"]
59+
hash2curve = ["arithmetic", "dep:hash2curve", "dep:primeorder", "primeorder/hash2curve"]
5960
pem = ["ecdsa-core/pem", "elliptic-curve/pem", "pkcs8"]
6061
pkcs8 = ["ecdsa-core/pkcs8", "elliptic-curve/pkcs8"]
6162
precomputed-tables = ["arithmetic"]

‎k256/src/arithmetic/hash2curve.rs

Lines changed: 111 additions & 94 deletions
Original file line numberDiff line numberDiff line change
@@ -4,9 +4,8 @@ use elliptic_curve::bigint::{ArrayEncoding, U256};
44
use elliptic_curve::consts::{U4, U16, U48};
55
use elliptic_curve::ops::Reduce;
66
use elliptic_curve::subtle::{Choice, ConditionallySelectable, ConstantTimeEq};
7-
use hash2curve::{
8-
GroupDigest, Isogeny, IsogenyCoefficients, MapToCurve, OsswuMap, OsswuMapParams, Sgn0,
9-
};
7+
use hash2curve::{GroupDigest, MapToCurve};
8+
use primeorder::osswu::{OsswuMap, OsswuMapParams, Sgn0};
109

1110
use crate::{AffinePoint, ProjectivePoint, Scalar, Secp256k1};
1211

@@ -134,7 +133,7 @@ impl MapToCurve for Secp256k1 {
134133

135134
fn map_to_curve(element: FieldElement) -> ProjectivePoint {
136135
let (rx, ry) = element.osswu();
137-
let (qx, qy) = FieldElement::isogeny(rx, ry);
136+
let (qx, qy) = isogeny(rx, ry);
138137

139138
AffinePoint {
140139
x: qx,
@@ -163,96 +162,114 @@ impl Reduce<Array<u8, U48>> for Scalar {
163162
}
164163
}
165164

166-
impl Isogeny for FieldElement {
167-
type Degree = U4;
168-
169-
// See section E.1 in
170-
// <https://datatracker.ietf.org/doc/draft-irtf-cfrg-hash-to-curve/>
171-
const COEFFICIENTS: IsogenyCoefficients<Self> = IsogenyCoefficients {
172-
xnum: &[
173-
FieldElement::from_bytes_unchecked(&[
174-
0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38,
175-
0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8d,
176-
0xaa, 0xaa, 0xa8, 0xc7,
177-
]),
178-
FieldElement::from_bytes_unchecked(&[
179-
0x07, 0xd3, 0xd4, 0xc8, 0x0b, 0xc3, 0x21, 0xd5, 0xb9, 0xf3, 0x15, 0xce, 0xa7, 0xfd,
180-
0x44, 0xc5, 0xd5, 0x95, 0xd2, 0xfc, 0x0b, 0xf6, 0x3b, 0x92, 0xdf, 0xff, 0x10, 0x44,
181-
0xf1, 0x7c, 0x65, 0x81,
182-
]),
183-
FieldElement::from_bytes_unchecked(&[
184-
0x53, 0x4c, 0x32, 0x8d, 0x23, 0xf2, 0x34, 0xe6, 0xe2, 0xa4, 0x13, 0xde, 0xca, 0x25,
185-
0xca, 0xec, 0xe4, 0x50, 0x61, 0x44, 0x03, 0x7c, 0x40, 0x31, 0x4e, 0xcb, 0xd0, 0xb5,
186-
0x3d, 0x9d, 0xd2, 0x62,
187-
]),
188-
FieldElement::from_bytes_unchecked(&[
189-
0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38,
190-
0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8d,
191-
0xaa, 0xaa, 0xa8, 0x8c,
192-
]),
193-
],
194-
xden: &[
195-
FieldElement::from_bytes_unchecked(&[
196-
0xd3, 0x57, 0x71, 0x19, 0x3d, 0x94, 0x91, 0x8a, 0x9c, 0xa3, 0x4c, 0xcb, 0xb7, 0xb6,
197-
0x40, 0xdd, 0x86, 0xcd, 0x40, 0x95, 0x42, 0xf8, 0x48, 0x7d, 0x9f, 0xe6, 0xb7, 0x45,
198-
0x78, 0x1e, 0xb4, 0x9b,
199-
]),
200-
FieldElement::from_bytes_unchecked(&[
201-
0xed, 0xad, 0xc6, 0xf6, 0x43, 0x83, 0xdc, 0x1d, 0xf7, 0xc4, 0xb2, 0xd5, 0x1b, 0x54,
202-
0x22, 0x54, 0x06, 0xd3, 0x6b, 0x64, 0x1f, 0x5e, 0x41, 0xbb, 0xc5, 0x2a, 0x56, 0x61,
203-
0x2a, 0x8c, 0x6d, 0x14,
204-
]),
205-
FieldElement::from_bytes_unchecked(&[
206-
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
207-
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
208-
0x00, 0x00, 0x00, 0x01,
209-
]),
210-
],
211-
ynum: &[
212-
FieldElement::from_bytes_unchecked(&[
213-
0x4b, 0xda, 0x12, 0xf6, 0x84, 0xbd, 0xa1, 0x2f, 0x68, 0x4b, 0xda, 0x12, 0xf6, 0x84,
214-
0xbd, 0xa1, 0x2f, 0x68, 0x4b, 0xda, 0x12, 0xf6, 0x84, 0xbd, 0xa1, 0x2f, 0x68, 0x4b,
215-
0x8e, 0x38, 0xe2, 0x3c,
216-
]),
217-
FieldElement::from_bytes_unchecked(&[
218-
0xc7, 0x5e, 0x0c, 0x32, 0xd5, 0xcb, 0x7c, 0x0f, 0xa9, 0xd0, 0xa5, 0x4b, 0x12, 0xa0,
219-
0xa6, 0xd5, 0x64, 0x7a, 0xb0, 0x46, 0xd6, 0x86, 0xda, 0x6f, 0xdf, 0xfc, 0x90, 0xfc,
220-
0x20, 0x1d, 0x71, 0xa3,
221-
]),
222-
FieldElement::from_bytes_unchecked(&[
223-
0x29, 0xa6, 0x19, 0x46, 0x91, 0xf9, 0x1a, 0x73, 0x71, 0x52, 0x09, 0xef, 0x65, 0x12,
224-
0xe5, 0x76, 0x72, 0x28, 0x30, 0xa2, 0x01, 0xbe, 0x20, 0x18, 0xa7, 0x65, 0xe8, 0x5a,
225-
0x9e, 0xce, 0xe9, 0x31,
226-
]),
227-
FieldElement::from_bytes_unchecked(&[
228-
0x2f, 0x68, 0x4b, 0xda, 0x12, 0xf6, 0x84, 0xbd, 0xa1, 0x2f, 0x68, 0x4b, 0xda, 0x12,
229-
0xf6, 0x84, 0xbd, 0xa1, 0x2f, 0x68, 0x4b, 0xda, 0x12, 0xf6, 0x84, 0xbd, 0xa1, 0x2f,
230-
0x38, 0xe3, 0x8d, 0x84,
231-
]),
232-
],
233-
yden: &[
234-
FieldElement::from_bytes_unchecked(&[
235-
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
236-
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe,
237-
0xff, 0xff, 0xf9, 0x3b,
238-
]),
239-
FieldElement::from_bytes_unchecked(&[
240-
0x7a, 0x06, 0x53, 0x4b, 0xb8, 0xbd, 0xb4, 0x9f, 0xd5, 0xe9, 0xe6, 0x63, 0x27, 0x22,
241-
0xc2, 0x98, 0x94, 0x67, 0xc1, 0xbf, 0xc8, 0xe8, 0xd9, 0x78, 0xdf, 0xb4, 0x25, 0xd2,
242-
0x68, 0x5c, 0x25, 0x73,
243-
]),
244-
FieldElement::from_bytes_unchecked(&[
245-
0x64, 0x84, 0xaa, 0x71, 0x65, 0x45, 0xca, 0x2c, 0xf3, 0xa7, 0x0c, 0x3f, 0xa8, 0xfe,
246-
0x33, 0x7e, 0x0a, 0x3d, 0x21, 0x16, 0x2f, 0x0d, 0x62, 0x99, 0xa7, 0xbf, 0x81, 0x92,
247-
0xbf, 0xd2, 0xa7, 0x6f,
248-
]),
249-
FieldElement::from_bytes_unchecked(&[
250-
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
251-
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
252-
0x00, 0x00, 0x00, 0x01,
253-
]),
254-
],
255-
};
165+
// See section E.1 in
166+
// <https://datatracker.ietf.org/doc/draft-irtf-cfrg-hash-to-curve/>
167+
fn isogeny(x: FieldElement, y: FieldElement) -> (FieldElement, FieldElement) {
168+
const XNUM: [FieldElement; 4] = [
169+
FieldElement::from_bytes_unchecked(&[
170+
0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38,
171+
0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8d,
172+
0xaa, 0xaa, 0xa8, 0xc7,
173+
]),
174+
FieldElement::from_bytes_unchecked(&[
175+
0x07, 0xd3, 0xd4, 0xc8, 0x0b, 0xc3, 0x21, 0xd5, 0xb9, 0xf3, 0x15, 0xce, 0xa7, 0xfd,
176+
0x44, 0xc5, 0xd5, 0x95, 0xd2, 0xfc, 0x0b, 0xf6, 0x3b, 0x92, 0xdf, 0xff, 0x10, 0x44,
177+
0xf1, 0x7c, 0x65, 0x81,
178+
]),
179+
FieldElement::from_bytes_unchecked(&[
180+
0x53, 0x4c, 0x32, 0x8d, 0x23, 0xf2, 0x34, 0xe6, 0xe2, 0xa4, 0x13, 0xde, 0xca, 0x25,
181+
0xca, 0xec, 0xe4, 0x50, 0x61, 0x44, 0x03, 0x7c, 0x40, 0x31, 0x4e, 0xcb, 0xd0, 0xb5,
182+
0x3d, 0x9d, 0xd2, 0x62,
183+
]),
184+
FieldElement::from_bytes_unchecked(&[
185+
0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38,
186+
0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8e, 0x38, 0xe3, 0x8d,
187+
0xaa, 0xaa, 0xa8, 0x8c,
188+
]),
189+
];
190+
const XDEN: [FieldElement; 3] = [
191+
FieldElement::from_bytes_unchecked(&[
192+
0xd3, 0x57, 0x71, 0x19, 0x3d, 0x94, 0x91, 0x8a, 0x9c, 0xa3, 0x4c, 0xcb, 0xb7, 0xb6,
193+
0x40, 0xdd, 0x86, 0xcd, 0x40, 0x95, 0x42, 0xf8, 0x48, 0x7d, 0x9f, 0xe6, 0xb7, 0x45,
194+
0x78, 0x1e, 0xb4, 0x9b,
195+
]),
196+
FieldElement::from_bytes_unchecked(&[
197+
0xed, 0xad, 0xc6, 0xf6, 0x43, 0x83, 0xdc, 0x1d, 0xf7, 0xc4, 0xb2, 0xd5, 0x1b, 0x54,
198+
0x22, 0x54, 0x06, 0xd3, 0x6b, 0x64, 0x1f, 0x5e, 0x41, 0xbb, 0xc5, 0x2a, 0x56, 0x61,
199+
0x2a, 0x8c, 0x6d, 0x14,
200+
]),
201+
FieldElement::from_bytes_unchecked(&[
202+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
203+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
204+
0x00, 0x00, 0x00, 0x01,
205+
]),
206+
];
207+
const YNUM: [FieldElement; 4] = [
208+
FieldElement::from_bytes_unchecked(&[
209+
0x4b, 0xda, 0x12, 0xf6, 0x84, 0xbd, 0xa1, 0x2f, 0x68, 0x4b, 0xda, 0x12, 0xf6, 0x84,
210+
0xbd, 0xa1, 0x2f, 0x68, 0x4b, 0xda, 0x12, 0xf6, 0x84, 0xbd, 0xa1, 0x2f, 0x68, 0x4b,
211+
0x8e, 0x38, 0xe2, 0x3c,
212+
]),
213+
FieldElement::from_bytes_unchecked(&[
214+
0xc7, 0x5e, 0x0c, 0x32, 0xd5, 0xcb, 0x7c, 0x0f, 0xa9, 0xd0, 0xa5, 0x4b, 0x12, 0xa0,
215+
0xa6, 0xd5, 0x64, 0x7a, 0xb0, 0x46, 0xd6, 0x86, 0xda, 0x6f, 0xdf, 0xfc, 0x90, 0xfc,
216+
0x20, 0x1d, 0x71, 0xa3,
217+
]),
218+
FieldElement::from_bytes_unchecked(&[
219+
0x29, 0xa6, 0x19, 0x46, 0x91, 0xf9, 0x1a, 0x73, 0x71, 0x52, 0x09, 0xef, 0x65, 0x12,
220+
0xe5, 0x76, 0x72, 0x28, 0x30, 0xa2, 0x01, 0xbe, 0x20, 0x18, 0xa7, 0x65, 0xe8, 0x5a,
221+
0x9e, 0xce, 0xe9, 0x31,
222+
]),
223+
FieldElement::from_bytes_unchecked(&[
224+
0x2f, 0x68, 0x4b, 0xda, 0x12, 0xf6, 0x84, 0xbd, 0xa1, 0x2f, 0x68, 0x4b, 0xda, 0x12,
225+
0xf6, 0x84, 0xbd, 0xa1, 0x2f, 0x68, 0x4b, 0xda, 0x12, 0xf6, 0x84, 0xbd, 0xa1, 0x2f,
226+
0x38, 0xe3, 0x8d, 0x84,
227+
]),
228+
];
229+
const YDEN: [FieldElement; 4] = [
230+
FieldElement::from_bytes_unchecked(&[
231+
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
232+
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe,
233+
0xff, 0xff, 0xf9, 0x3b,
234+
]),
235+
FieldElement::from_bytes_unchecked(&[
236+
0x7a, 0x06, 0x53, 0x4b, 0xb8, 0xbd, 0xb4, 0x9f, 0xd5, 0xe9, 0xe6, 0x63, 0x27, 0x22,
237+
0xc2, 0x98, 0x94, 0x67, 0xc1, 0xbf, 0xc8, 0xe8, 0xd9, 0x78, 0xdf, 0xb4, 0x25, 0xd2,
238+
0x68, 0x5c, 0x25, 0x73,
239+
]),
240+
FieldElement::from_bytes_unchecked(&[
241+
0x64, 0x84, 0xaa, 0x71, 0x65, 0x45, 0xca, 0x2c, 0xf3, 0xa7, 0x0c, 0x3f, 0xa8, 0xfe,
242+
0x33, 0x7e, 0x0a, 0x3d, 0x21, 0x16, 0x2f, 0x0d, 0x62, 0x99, 0xa7, 0xbf, 0x81, 0x92,
243+
0xbf, 0xd2, 0xa7, 0x6f,
244+
]),
245+
FieldElement::from_bytes_unchecked(&[
246+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
247+
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
248+
0x00, 0x00, 0x00, 0x01,
249+
]),
250+
];
251+
252+
let mut xs = Array::<FieldElement, U4>::default();
253+
xs[0] = FieldElement::ONE;
254+
xs[1] = x;
255+
xs[2] = x.square();
256+
for i in 3..4 {
257+
xs[i] = xs[i - 1] * x;
258+
}
259+
let x_num = compute_iso(&xs, &XNUM);
260+
let x_den = compute_iso(&xs, &XDEN).invert().unwrap();
261+
let y_num = compute_iso(&xs, &YNUM) * y;
262+
let y_den = compute_iso(&xs, &YDEN).invert().unwrap();
263+
264+
(x_num * x_den, y_num * y_den)
265+
}
266+
267+
fn compute_iso(xxs: &[FieldElement], k: &[FieldElement]) -> FieldElement {
268+
let mut xx = FieldElement::ZERO;
269+
for (xi, ki) in xxs.iter().zip(k.iter()) {
270+
xx += *xi * ki;
271+
}
272+
xx
256273
}
257274

258275
#[cfg(test)]

‎p256/Cargo.toml

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -50,7 +50,7 @@ digest = ["ecdsa-core/digest", "ecdsa-core/hazmat"]
5050
ecdh = ["arithmetic", "elliptic-curve/ecdh"]
5151
ecdsa = ["arithmetic", "ecdsa-core/signing", "ecdsa-core/verifying", "sha256"]
5252
expose-field = ["arithmetic"]
53-
hash2curve = ["arithmetic", "dep:hash2curve"]
53+
hash2curve = ["arithmetic", "dep:hash2curve", "primeorder/hash2curve"]
5454
oprf = ["hash2curve", "sha2"]
5555
pem = ["elliptic-curve/pem", "ecdsa-core/pem", "pkcs8"]
5656
pkcs8 = ["ecdsa-core?/pkcs8", "elliptic-curve/pkcs8"]

‎p256/src/arithmetic/hash2curve.rs

Lines changed: 5 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -5,10 +5,10 @@ use elliptic_curve::{
55
bigint::{ArrayEncoding, U256},
66
consts::{U16, U48},
77
ops::Reduce,
8-
point::DecompressPoint,
98
subtle::Choice,
109
};
11-
use hash2curve::{GroupDigest, MapToCurve, OsswuMap, OsswuMapParams, Sgn0};
10+
use hash2curve::{GroupDigest, MapToCurve};
11+
use primeorder::osswu::{AffineOsswuMap, OsswuMap, OsswuMapParams, Sgn0};
1212

1313
impl GroupDigest for NistP256 {
1414
type SecurityLevel = U16;
@@ -63,12 +63,7 @@ impl MapToCurve for NistP256 {
6363
type ScalarLength = U48;
6464

6565
fn map_to_curve(element: Self::FieldElement) -> ProjectivePoint {
66-
let (qx, qy) = element.osswu();
67-
68-
// TODO(tarcieri): assert that `qy` is correct? less circuitous conversion?
69-
AffinePoint::decompress(&qx.to_bytes(), qy.is_odd())
70-
.unwrap()
71-
.into()
66+
AffinePoint::osswu(&element).into()
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}
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}
7469

@@ -101,9 +96,10 @@ mod tests {
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consts::U48,
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sec1::{self, ToEncodedPoint},
10398
};
104-
use hash2curve::{self, ExpandMsgXmd, GroupDigest, MapToCurve, OsswuMap};
99+
use hash2curve::{self, ExpandMsgXmd, GroupDigest, MapToCurve};
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use hex_literal::hex;
106101
use primefield::bigint::Reduce;
102+
use primeorder::osswu::OsswuMap;
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use proptest::{num::u64::ANY, prelude::ProptestConfig, proptest};
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use sha2::Sha256;
109105

‎p384/Cargo.toml

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -54,7 +54,7 @@ digest = ["ecdsa-core/digest", "ecdsa-core/hazmat"]
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ecdh = ["arithmetic", "elliptic-curve/ecdh"]
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ecdsa = ["arithmetic", "ecdsa-core/signing", "ecdsa-core/verifying", "sha384"]
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expose-field = ["arithmetic"]
57-
hash2curve = ["arithmetic", "dep:hash2curve"]
57+
hash2curve = ["arithmetic", "dep:hash2curve", "primeorder/hash2curve"]
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oprf = ["hash2curve", "sha2"]
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pem = ["elliptic-curve/pem", "ecdsa-core/pem", "pkcs8"]
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pkcs8 = ["ecdsa-core/pkcs8", "elliptic-curve/pkcs8"]

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