commonware_cryptography/ed25519/
scheme.rs

1use crate::{Array, BatchVerifier, PrivateKeyExt};
2use bytes::{Buf, BufMut};
3use commonware_codec::{Error as CodecError, FixedSize, Read, ReadExt, Write};
4use commonware_utils::{hex, union_unique};
5use ed25519_consensus::{self, VerificationKey};
6use rand::{CryptoRng, Rng, RngCore};
7use std::{
8    borrow::Cow,
9    fmt::{Debug, Display},
10    hash::{Hash, Hasher},
11    ops::Deref,
12};
13use zeroize::{Zeroize, ZeroizeOnDrop};
14
15const CURVE_NAME: &str = "ed25519";
16const PRIVATE_KEY_LENGTH: usize = 32;
17const PUBLIC_KEY_LENGTH: usize = 32;
18const SIGNATURE_LENGTH: usize = 64;
19
20/// Ed25519 Private Key.
21#[derive(Clone, Zeroize, ZeroizeOnDrop)]
22pub struct PrivateKey {
23    raw: [u8; PRIVATE_KEY_LENGTH],
24    key: ed25519_consensus::SigningKey,
25}
26
27impl crate::PrivateKey for PrivateKey {}
28
29impl crate::Signer for PrivateKey {
30    type Signature = Signature;
31    type PublicKey = PublicKey;
32
33    fn sign(&self, namespace: Option<&[u8]>, msg: &[u8]) -> Self::Signature {
34        let sig = match namespace {
35            Some(namespace) => self.key.sign(&union_unique(namespace, msg)),
36            None => self.key.sign(msg),
37        };
38        Signature::from(sig)
39    }
40
41    fn public_key(&self) -> Self::PublicKey {
42        let raw = self.key.verification_key().to_bytes();
43        Self::PublicKey {
44            raw,
45            key: self.key.verification_key().to_owned(),
46        }
47    }
48}
49
50impl PrivateKeyExt for PrivateKey {
51    fn from_rng<R: Rng + CryptoRng>(rng: &mut R) -> Self {
52        let key = ed25519_consensus::SigningKey::new(rng);
53        let raw = key.to_bytes();
54        Self { raw, key }
55    }
56}
57
58impl Write for PrivateKey {
59    fn write(&self, buf: &mut impl BufMut) {
60        self.raw.write(buf);
61    }
62}
63
64impl Read for PrivateKey {
65    type Cfg = ();
66
67    fn read_cfg(buf: &mut impl Buf, _: &()) -> Result<Self, CodecError> {
68        let raw = <[u8; Self::SIZE]>::read(buf)?;
69        let key = ed25519_consensus::SigningKey::from(raw);
70        Ok(Self { raw, key })
71    }
72}
73
74impl FixedSize for PrivateKey {
75    const SIZE: usize = PRIVATE_KEY_LENGTH;
76}
77
78impl Array for PrivateKey {}
79
80impl Eq for PrivateKey {}
81
82impl Hash for PrivateKey {
83    fn hash<H: Hasher>(&self, state: &mut H) {
84        self.raw.hash(state);
85    }
86}
87
88impl PartialEq for PrivateKey {
89    fn eq(&self, other: &Self) -> bool {
90        self.raw == other.raw
91    }
92}
93
94impl Ord for PrivateKey {
95    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
96        self.raw.cmp(&other.raw)
97    }
98}
99
100impl PartialOrd for PrivateKey {
101    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
102        Some(self.cmp(other))
103    }
104}
105
106impl AsRef<[u8]> for PrivateKey {
107    fn as_ref(&self) -> &[u8] {
108        &self.raw
109    }
110}
111
112impl Deref for PrivateKey {
113    type Target = [u8];
114    fn deref(&self) -> &[u8] {
115        &self.raw
116    }
117}
118
119impl From<ed25519_consensus::SigningKey> for PrivateKey {
120    fn from(key: ed25519_consensus::SigningKey) -> Self {
121        let raw = key.to_bytes();
122        Self { raw, key }
123    }
124}
125
126impl Debug for PrivateKey {
127    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
128        write!(f, "{}", hex(&self.raw))
129    }
130}
131
132impl Display for PrivateKey {
133    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
134        write!(f, "{}", hex(&self.raw))
135    }
136}
137
138/// Ed25519 Public Key.
139#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
140pub struct PublicKey {
141    raw: [u8; PUBLIC_KEY_LENGTH],
142    key: ed25519_consensus::VerificationKey,
143}
144
145impl From<PrivateKey> for PublicKey {
146    fn from(value: PrivateKey) -> Self {
147        let raw = value.key.verification_key().to_bytes();
148        Self {
149            raw,
150            key: value.key.verification_key(),
151        }
152    }
153}
154
155impl crate::PublicKey for PublicKey {}
156
157impl crate::Verifier for PublicKey {
158    type Signature = Signature;
159
160    fn verify(&self, namespace: Option<&[u8]>, msg: &[u8], sig: &Self::Signature) -> bool {
161        match namespace {
162            Some(namespace) => {
163                let payload = union_unique(namespace, msg);
164                self.key.verify(&sig.signature, &payload).is_ok()
165            }
166            None => self.key.verify(&sig.signature, msg).is_ok(),
167        }
168    }
169}
170
171impl Write for PublicKey {
172    fn write(&self, buf: &mut impl BufMut) {
173        self.raw.write(buf);
174    }
175}
176
177impl Read for PublicKey {
178    type Cfg = ();
179
180    fn read_cfg(buf: &mut impl Buf, _: &()) -> Result<Self, CodecError> {
181        let raw = <[u8; Self::SIZE]>::read(buf)?;
182        let key = VerificationKey::try_from(raw)
183            .map_err(|e| CodecError::Wrapped(CURVE_NAME, e.into()))?;
184        Ok(Self { raw, key })
185    }
186}
187
188impl FixedSize for PublicKey {
189    const SIZE: usize = PUBLIC_KEY_LENGTH;
190}
191
192impl Array for PublicKey {}
193
194impl AsRef<[u8]> for PublicKey {
195    fn as_ref(&self) -> &[u8] {
196        &self.raw
197    }
198}
199
200impl Deref for PublicKey {
201    type Target = [u8];
202    fn deref(&self) -> &[u8] {
203        &self.raw
204    }
205}
206
207impl From<VerificationKey> for PublicKey {
208    fn from(key: VerificationKey) -> Self {
209        let raw = key.to_bytes();
210        Self { raw, key }
211    }
212}
213
214impl Debug for PublicKey {
215    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
216        write!(f, "{}", hex(&self.raw))
217    }
218}
219
220impl Display for PublicKey {
221    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
222        write!(f, "{}", hex(&self.raw))
223    }
224}
225
226/// Ed25519 Signature.
227#[derive(Clone, Eq, PartialEq)]
228pub struct Signature {
229    raw: [u8; SIGNATURE_LENGTH],
230    signature: ed25519_consensus::Signature,
231}
232
233impl crate::Signature for Signature {}
234
235impl Write for Signature {
236    fn write(&self, buf: &mut impl BufMut) {
237        self.raw.write(buf);
238    }
239}
240
241impl Read for Signature {
242    type Cfg = ();
243
244    fn read_cfg(buf: &mut impl Buf, _: &()) -> Result<Self, CodecError> {
245        let raw = <[u8; Self::SIZE]>::read(buf)?;
246        let signature = ed25519_consensus::Signature::from(raw);
247        Ok(Self { raw, signature })
248    }
249}
250
251impl FixedSize for Signature {
252    const SIZE: usize = SIGNATURE_LENGTH;
253}
254
255impl Array for Signature {}
256
257impl Hash for Signature {
258    fn hash<H: Hasher>(&self, state: &mut H) {
259        self.raw.hash(state);
260    }
261}
262
263impl Ord for Signature {
264    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
265        self.raw.cmp(&other.raw)
266    }
267}
268
269impl PartialOrd for Signature {
270    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
271        Some(self.cmp(other))
272    }
273}
274
275impl AsRef<[u8]> for Signature {
276    fn as_ref(&self) -> &[u8] {
277        &self.raw
278    }
279}
280
281impl Deref for Signature {
282    type Target = [u8];
283    fn deref(&self) -> &[u8] {
284        &self.raw
285    }
286}
287
288impl From<ed25519_consensus::Signature> for Signature {
289    fn from(value: ed25519_consensus::Signature) -> Self {
290        let raw = value.to_bytes();
291        Self {
292            raw,
293            signature: value,
294        }
295    }
296}
297
298impl Debug for Signature {
299    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
300        write!(f, "{}", hex(&self.raw))
301    }
302}
303
304impl Display for Signature {
305    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
306        write!(f, "{}", hex(&self.raw))
307    }
308}
309
310/// Ed25519 Batch Verifier.
311pub struct Batch {
312    verifier: ed25519_consensus::batch::Verifier,
313}
314
315impl BatchVerifier<PublicKey> for Batch {
316    fn new() -> Self {
317        Batch {
318            verifier: ed25519_consensus::batch::Verifier::new(),
319        }
320    }
321
322    fn add(
323        &mut self,
324        namespace: Option<&[u8]>,
325        message: &[u8],
326        public_key: &PublicKey,
327        signature: &Signature,
328    ) -> bool {
329        let payload = match namespace {
330            Some(namespace) => Cow::Owned(union_unique(namespace, message)),
331            None => Cow::Borrowed(message),
332        };
333        let item = ed25519_consensus::batch::Item::from((
334            public_key.key.into(),
335            signature.signature,
336            &payload,
337        ));
338        self.verifier.queue(item);
339        true
340    }
341
342    fn verify<R: RngCore + CryptoRng>(self, rng: &mut R) -> bool {
343        self.verifier.verify(rng).is_ok()
344    }
345}
346
347/// Test vectors sourced from https://datatracker.ietf.org/doc/html/rfc8032#section-7.1.
348#[cfg(test)]
349mod tests {
350    use super::*;
351    use crate::{ed25519, Signer as _, Verifier as _};
352    use commonware_codec::{DecodeExt, Encode};
353    use rand::rngs::OsRng;
354
355    fn test_sign_and_verify(
356        private_key: PrivateKey,
357        public_key: PublicKey,
358        message: &[u8],
359        signature: Signature,
360    ) {
361        let computed_signature = private_key.sign(None, message);
362        assert_eq!(computed_signature, signature);
363        assert!(public_key.verify(None, message, &computed_signature));
364    }
365
366    fn parse_private_key(private_key: &str) -> PrivateKey {
367        PrivateKey::decode(
368            commonware_utils::from_hex_formatted(private_key)
369                .unwrap()
370                .as_ref(),
371        )
372        .unwrap()
373    }
374
375    fn parse_public_key(public_key: &str) -> PublicKey {
376        PublicKey::decode(
377            commonware_utils::from_hex_formatted(public_key)
378                .unwrap()
379                .as_ref(),
380        )
381        .unwrap()
382    }
383
384    fn parse_signature(signature: &str) -> Signature {
385        Signature::decode(
386            commonware_utils::from_hex_formatted(signature)
387                .unwrap()
388                .as_ref(),
389        )
390        .unwrap()
391    }
392
393    fn vector_1() -> (PrivateKey, PublicKey, Vec<u8>, Signature) {
394        (
395            // secret key
396            parse_private_key(
397                "
398                9d61b19deffd5a60ba844af492ec2cc4
399                4449c5697b326919703bac031cae7f60
400                ",
401            ),
402            // public key
403            parse_public_key(
404                "
405                d75a980182b10ab7d54bfed3c964073a
406                0ee172f3daa62325af021a68f707511a
407                ",
408            ),
409            // message
410            b"".to_vec(),
411            // signature
412            parse_signature(
413                "
414                e5564300c360ac729086e2cc806e828a
415                84877f1eb8e5d974d873e06522490155
416                5fb8821590a33bacc61e39701cf9b46b
417                d25bf5f0595bbe24655141438e7a100b
418                ",
419            ),
420        )
421    }
422
423    fn vector_2() -> (PrivateKey, PublicKey, Vec<u8>, Signature) {
424        (
425            // secret key
426            parse_private_key(
427                "
428                4ccd089b28ff96da9db6c346ec114e0f
429                5b8a319f35aba624da8cf6ed4fb8a6fb
430                ",
431            ),
432            // public key
433            parse_public_key(
434                "
435                3d4017c3e843895a92b70aa74d1b7ebc
436                9c982ccf2ec4968cc0cd55f12af4660c
437                ",
438            ),
439            // message
440            [0x72].to_vec(),
441            // signature
442            parse_signature(
443                "
444                92a009a9f0d4cab8720e820b5f642540
445                a2b27b5416503f8fb3762223ebdb69da
446                085ac1e43e15996e458f3613d0f11d8c
447                387b2eaeb4302aeeb00d291612bb0c00
448                ",
449            ),
450        )
451    }
452
453    #[test]
454    fn test_codec_private_key() {
455        let private_key = parse_private_key(
456            "
457            9d61b19deffd5a60ba844af492ec2cc4
458            4449c5697b326919703bac031cae7f60
459            ",
460        );
461        let encoded = private_key.encode();
462        assert_eq!(encoded.len(), PRIVATE_KEY_LENGTH);
463        let decoded = PrivateKey::decode(encoded).unwrap();
464        assert_eq!(private_key, decoded);
465    }
466
467    #[test]
468    fn test_codec_public_key() {
469        let public_key = parse_public_key(
470            "
471            d75a980182b10ab7d54bfed3c964073a
472            0ee172f3daa62325af021a68f707511a
473            ",
474        );
475        let encoded = public_key.encode();
476        assert_eq!(encoded.len(), PUBLIC_KEY_LENGTH);
477        let decoded = PublicKey::decode(encoded).unwrap();
478        assert_eq!(public_key, decoded);
479    }
480
481    #[test]
482    fn test_codec_signature() {
483        let signature = parse_signature(
484            "
485            e5564300c360ac729086e2cc806e828a
486            84877f1eb8e5d974d873e06522490155
487            5fb8821590a33bacc61e39701cf9b46b
488            d25bf5f0595bbe24655141438e7a100b
489            ",
490        );
491        let encoded = signature.encode();
492        assert_eq!(encoded.len(), SIGNATURE_LENGTH);
493        let decoded = Signature::decode(encoded).unwrap();
494        assert_eq!(signature, decoded);
495    }
496
497    #[test]
498    fn rfc8032_test_vector_1() {
499        let (private_key, public_key, message, signature) = vector_1();
500        test_sign_and_verify(private_key, public_key, &message, signature)
501    }
502
503    // sanity check the test infra rejects bad signatures
504    #[test]
505    #[should_panic]
506    fn bad_signature() {
507        let (private_key, public_key, message, _) = vector_1();
508        let private_key_2 = PrivateKey::from_rng(&mut OsRng);
509        let bad_signature = private_key_2.sign(None, message.as_ref());
510        test_sign_and_verify(private_key, public_key, &message, bad_signature);
511    }
512
513    // sanity check the test infra rejects non-matching messages
514    #[test]
515    #[should_panic]
516    fn different_message() {
517        let (private_key, public_key, _, signature) = vector_1();
518        let different_message = b"this is a different message".to_vec();
519        test_sign_and_verify(private_key, public_key, &different_message, signature);
520    }
521
522    #[test]
523    fn rfc8032_test_vector_2() {
524        let (private_key, public_key, message, signature) = vector_2();
525        test_sign_and_verify(private_key, public_key, &message, signature)
526    }
527
528    #[test]
529    fn rfc8032_test_vector_3() {
530        let private_key = parse_private_key(
531            "
532            c5aa8df43f9f837bedb7442f31dcb7b1
533            66d38535076f094b85ce3a2e0b4458f7
534            ",
535        );
536        let public_key = parse_public_key(
537            "
538            fc51cd8e6218a1a38da47ed00230f058
539            0816ed13ba3303ac5deb911548908025
540            ",
541        );
542        let message: [u8; 2] = [0xaf, 0x82];
543        let signature = parse_signature(
544            "
545            6291d657deec24024827e69c3abe01a3
546            0ce548a284743a445e3680d7db5ac3ac
547            18ff9b538d16f290ae67f760984dc659
548            4a7c15e9716ed28dc027beceea1ec40a
549            ",
550        );
551        test_sign_and_verify(private_key, public_key, &message, signature)
552    }
553
554    #[test]
555    fn rfc8032_test_vector_1024() {
556        let private_key = parse_private_key(
557            "
558            f5e5767cf153319517630f226876b86c
559            8160cc583bc013744c6bf255f5cc0ee5
560            ",
561        );
562        let public_key = parse_public_key(
563            "
564            278117fc144c72340f67d0f2316e8386
565            ceffbf2b2428c9c51fef7c597f1d426e
566            ",
567        );
568        let message = commonware_utils::from_hex_formatted(
569            "
570            08b8b2b733424243760fe426a4b54908
571            632110a66c2f6591eabd3345e3e4eb98
572            fa6e264bf09efe12ee50f8f54e9f77b1
573            e355f6c50544e23fb1433ddf73be84d8
574            79de7c0046dc4996d9e773f4bc9efe57
575            38829adb26c81b37c93a1b270b20329d
576            658675fc6ea534e0810a4432826bf58c
577            941efb65d57a338bbd2e26640f89ffbc
578            1a858efcb8550ee3a5e1998bd177e93a
579            7363c344fe6b199ee5d02e82d522c4fe
580            ba15452f80288a821a579116ec6dad2b
581            3b310da903401aa62100ab5d1a36553e
582            06203b33890cc9b832f79ef80560ccb9
583            a39ce767967ed628c6ad573cb116dbef
584            efd75499da96bd68a8a97b928a8bbc10
585            3b6621fcde2beca1231d206be6cd9ec7
586            aff6f6c94fcd7204ed3455c68c83f4a4
587            1da4af2b74ef5c53f1d8ac70bdcb7ed1
588            85ce81bd84359d44254d95629e9855a9
589            4a7c1958d1f8ada5d0532ed8a5aa3fb2
590            d17ba70eb6248e594e1a2297acbbb39d
591            502f1a8c6eb6f1ce22b3de1a1f40cc24
592            554119a831a9aad6079cad88425de6bd
593            e1a9187ebb6092cf67bf2b13fd65f270
594            88d78b7e883c8759d2c4f5c65adb7553
595            878ad575f9fad878e80a0c9ba63bcbcc
596            2732e69485bbc9c90bfbd62481d9089b
597            eccf80cfe2df16a2cf65bd92dd597b07
598            07e0917af48bbb75fed413d238f5555a
599            7a569d80c3414a8d0859dc65a46128ba
600            b27af87a71314f318c782b23ebfe808b
601            82b0ce26401d2e22f04d83d1255dc51a
602            ddd3b75a2b1ae0784504df543af8969b
603            e3ea7082ff7fc9888c144da2af58429e
604            c96031dbcad3dad9af0dcbaaaf268cb8
605            fcffead94f3c7ca495e056a9b47acdb7
606            51fb73e666c6c655ade8297297d07ad1
607            ba5e43f1bca32301651339e22904cc8c
608            42f58c30c04aafdb038dda0847dd988d
609            cda6f3bfd15c4b4c4525004aa06eeff8
610            ca61783aacec57fb3d1f92b0fe2fd1a8
611            5f6724517b65e614ad6808d6f6ee34df
612            f7310fdc82aebfd904b01e1dc54b2927
613            094b2db68d6f903b68401adebf5a7e08
614            d78ff4ef5d63653a65040cf9bfd4aca7
615            984a74d37145986780fc0b16ac451649
616            de6188a7dbdf191f64b5fc5e2ab47b57
617            f7f7276cd419c17a3ca8e1b939ae49e4
618            88acba6b965610b5480109c8b17b80e1
619            b7b750dfc7598d5d5011fd2dcc5600a3
620            2ef5b52a1ecc820e308aa342721aac09
621            43bf6686b64b2579376504ccc493d97e
622            6aed3fb0f9cd71a43dd497f01f17c0e2
623            cb3797aa2a2f256656168e6c496afc5f
624            b93246f6b1116398a346f1a641f3b041
625            e989f7914f90cc2c7fff357876e506b5
626            0d334ba77c225bc307ba537152f3f161
627            0e4eafe595f6d9d90d11faa933a15ef1
628            369546868a7f3a45a96768d40fd9d034
629            12c091c6315cf4fde7cb68606937380d
630            b2eaaa707b4c4185c32eddcdd306705e
631            4dc1ffc872eeee475a64dfac86aba41c
632            0618983f8741c5ef68d3a101e8a3b8ca
633            c60c905c15fc910840b94c00a0b9d0
634            ",
635        )
636        .unwrap();
637        let signature = parse_signature(
638            "
639            0aab4c900501b3e24d7cdf4663326a3a
640            87df5e4843b2cbdb67cbf6e460fec350
641            aa5371b1508f9f4528ecea23c436d94b
642            5e8fcd4f681e30a6ac00a9704a188a03
643            ",
644        );
645        test_sign_and_verify(private_key, public_key, &message, signature)
646    }
647
648    #[test]
649    fn rfc8032_test_vector_sha() {
650        let private_key = commonware_utils::from_hex_formatted(
651            "
652            833fe62409237b9d62ec77587520911e
653            9a759cec1d19755b7da901b96dca3d42
654            ",
655        )
656        .unwrap();
657        let public_key = commonware_utils::from_hex_formatted(
658            "
659            ec172b93ad5e563bf4932c70e1245034
660            c35467ef2efd4d64ebf819683467e2bf
661            ",
662        )
663        .unwrap();
664        let message = commonware_utils::from_hex_formatted(
665            "
666            ddaf35a193617abacc417349ae204131
667            12e6fa4e89a97ea20a9eeee64b55d39a
668            2192992a274fc1a836ba3c23a3feebbd
669            454d4423643ce80e2a9ac94fa54ca49f
670            ",
671        )
672        .unwrap();
673        let signature = commonware_utils::from_hex_formatted(
674            "
675            dc2a4459e7369633a52b1bf277839a00
676            201009a3efbf3ecb69bea2186c26b589
677            09351fc9ac90b3ecfdfbc7c66431e030
678            3dca179c138ac17ad9bef1177331a704
679            ",
680        )
681        .unwrap();
682        test_sign_and_verify(
683            PrivateKey::decode(private_key.as_ref()).unwrap(),
684            PublicKey::decode(public_key.as_ref()).unwrap(),
685            &message,
686            Signature::decode(signature.as_ref()).unwrap(),
687        )
688    }
689
690    #[test]
691    fn batch_verify_valid() {
692        let v1 = vector_1();
693        let v2 = vector_2();
694        let mut batch = ed25519::Batch::new();
695        assert!(batch.add(None, &v1.2, &v1.1, &v1.3));
696        assert!(batch.add(None, &v2.2, &v2.1, &v2.3));
697        assert!(batch.verify(&mut rand::thread_rng()));
698    }
699
700    #[test]
701    fn batch_verify_invalid() {
702        let v1 = vector_1();
703        let v2 = vector_2();
704        let mut bad_signature = v2.3.to_vec();
705        bad_signature[3] = 0xff;
706
707        let mut batch = Batch::new();
708        assert!(batch.add(None, &v1.2, &v1.1, &v1.3));
709        assert!(batch.add(
710            None,
711            &v2.2,
712            &v2.1,
713            &Signature::decode(bad_signature.as_ref()).unwrap()
714        ));
715        assert!(!batch.verify(&mut rand::thread_rng()));
716    }
717
718    #[test]
719    fn test_zero_signature_fails() {
720        let (_, public_key, message, _) = vector_1();
721        let zero_sig = Signature::decode(vec![0u8; Signature::SIZE].as_ref()).unwrap();
722        assert!(!public_key.verify(None, &message, &zero_sig));
723    }
724
725    #[test]
726    fn test_high_s_fails() {
727        let (_, public_key, message, signature) = vector_1();
728        let mut bad_signature = signature.to_vec();
729        bad_signature[63] |= 0x80; // make S non-canonical
730        let bad_signature = Signature::decode(bad_signature.as_ref()).unwrap();
731        assert!(!public_key.verify(None, &message, &bad_signature));
732    }
733
734    #[test]
735    fn test_invalid_r_fails() {
736        let (_, public_key, message, signature) = vector_1();
737        let mut bad_signature = signature.to_vec();
738        for b in bad_signature.iter_mut().take(32) {
739            *b = 0xff; // invalid R component
740        }
741        let bad_signature = Signature::decode(bad_signature.as_ref()).unwrap();
742        assert!(!public_key.verify(None, &message, &bad_signature));
743    }
744}
commonware_cryptography/ed25519/scheme.rs

commonware_cryptography/ed25519/
scheme.rs
