commonware_cryptography/ed25519/
scheme.rs

1use crate::{Array, BatchScheme, Signer, Specification, Verifier};
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::borrow::Cow;
8use std::fmt::{Debug, Display};
9use std::hash::{Hash, Hasher};
10use std::ops::Deref;
11use zeroize::{Zeroize, ZeroizeOnDrop};
12
13const CURVE_NAME: &str = "ed25519";
14const PRIVATE_KEY_LENGTH: usize = 32;
15const PUBLIC_KEY_LENGTH: usize = 32;
16const SIGNATURE_LENGTH: usize = 64;
17
18/// Ed25519 Signer.
19#[derive(Clone)]
20pub struct Ed25519 {
21    signer: ed25519_consensus::SigningKey,
22    verifier: ed25519_consensus::VerificationKey,
23}
24
25impl Specification for Ed25519 {
26    type PublicKey = PublicKey;
27    type Signature = Signature;
28}
29
30impl Verifier for Ed25519 {
31    fn verify(
32        namespace: Option<&[u8]>,
33        message: &[u8],
34        public_key: &Self::PublicKey,
35        signature: &Self::Signature,
36    ) -> bool {
37        match namespace {
38            Some(namespace) => {
39                let payload = union_unique(namespace, message);
40                public_key
41                    .key
42                    .verify(&signature.signature, &payload)
43                    .is_ok()
44            }
45            None => public_key.key.verify(&signature.signature, message).is_ok(),
46        }
47    }
48}
49
50impl Signer for Ed25519 {
51    type PrivateKey = PrivateKey;
52
53    fn new<R: CryptoRng + Rng>(r: &mut R) -> Self {
54        let signer = ed25519_consensus::SigningKey::new(r);
55        let verifier = signer.verification_key();
56        Self { signer, verifier }
57    }
58
59    fn private_key(&self) -> PrivateKey {
60        PrivateKey::from(self.signer.clone())
61    }
62
63    fn public_key(&self) -> PublicKey {
64        PublicKey::from(self.verifier)
65    }
66
67    fn sign(&mut self, namespace: Option<&[u8]>, message: &[u8]) -> Signature {
68        let sig = match namespace {
69            Some(namespace) => self.signer.sign(&union_unique(namespace, message)),
70            None => self.signer.sign(message),
71        };
72        Signature::from(sig)
73    }
74}
75
76impl From<PrivateKey> for Ed25519 {
77    fn from(private_key: PrivateKey) -> Self {
78        let signer = private_key.key.clone();
79        let verifier = signer.verification_key();
80        Self { signer, verifier }
81    }
82}
83/// Ed25519 Batch Verifier.
84pub struct Ed25519Batch {
85    verifier: ed25519_consensus::batch::Verifier,
86}
87
88impl Specification for Ed25519Batch {
89    type PublicKey = PublicKey;
90    type Signature = Signature;
91}
92
93impl BatchScheme for Ed25519Batch {
94    fn new() -> Self {
95        Ed25519Batch {
96            verifier: ed25519_consensus::batch::Verifier::new(),
97        }
98    }
99
100    fn add(
101        &mut self,
102        namespace: Option<&[u8]>,
103        message: &[u8],
104        public_key: &Self::PublicKey,
105        signature: &Self::Signature,
106    ) -> bool {
107        let payload = match namespace {
108            Some(namespace) => Cow::Owned(union_unique(namespace, message)),
109            None => Cow::Borrowed(message),
110        };
111        let item = ed25519_consensus::batch::Item::from((
112            public_key.key.into(),
113            signature.signature,
114            &payload,
115        ));
116        self.verifier.queue(item);
117        true
118    }
119
120    fn verify<R: RngCore + CryptoRng>(self, rng: &mut R) -> bool {
121        self.verifier.verify(rng).is_ok()
122    }
123}
124
125/// Ed25519 Private Key.
126#[derive(Clone, Zeroize, ZeroizeOnDrop)]
127pub struct PrivateKey {
128    raw: [u8; PRIVATE_KEY_LENGTH],
129    key: ed25519_consensus::SigningKey,
130}
131
132impl Write for PrivateKey {
133    fn write(&self, buf: &mut impl BufMut) {
134        self.raw.write(buf);
135    }
136}
137
138impl Read for PrivateKey {
139    type Cfg = ();
140
141    fn read_cfg(buf: &mut impl Buf, _: &()) -> Result<Self, CodecError> {
142        let raw = <[u8; Self::SIZE]>::read(buf)?;
143        let key = ed25519_consensus::SigningKey::from(raw);
144        Ok(Self { raw, key })
145    }
146}
147
148impl FixedSize for PrivateKey {
149    const SIZE: usize = PRIVATE_KEY_LENGTH;
150}
151
152impl Array for PrivateKey {}
153
154impl Eq for PrivateKey {}
155
156impl Hash for PrivateKey {
157    fn hash<H: Hasher>(&self, state: &mut H) {
158        self.raw.hash(state);
159    }
160}
161
162impl PartialEq for PrivateKey {
163    fn eq(&self, other: &Self) -> bool {
164        self.raw == other.raw
165    }
166}
167
168impl Ord for PrivateKey {
169    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
170        self.raw.cmp(&other.raw)
171    }
172}
173
174impl PartialOrd for PrivateKey {
175    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
176        Some(self.cmp(other))
177    }
178}
179
180impl AsRef<[u8]> for PrivateKey {
181    fn as_ref(&self) -> &[u8] {
182        &self.raw
183    }
184}
185
186impl Deref for PrivateKey {
187    type Target = [u8];
188    fn deref(&self) -> &[u8] {
189        &self.raw
190    }
191}
192
193impl From<ed25519_consensus::SigningKey> for PrivateKey {
194    fn from(key: ed25519_consensus::SigningKey) -> Self {
195        let raw = key.to_bytes();
196        Self { raw, key }
197    }
198}
199
200impl Debug for PrivateKey {
201    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
202        write!(f, "{}", hex(&self.raw))
203    }
204}
205
206impl Display for PrivateKey {
207    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
208        write!(f, "{}", hex(&self.raw))
209    }
210}
211
212/// Ed25519 Public Key.
213#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
214pub struct PublicKey {
215    raw: [u8; PUBLIC_KEY_LENGTH],
216    key: ed25519_consensus::VerificationKey,
217}
218
219impl Write for PublicKey {
220    fn write(&self, buf: &mut impl BufMut) {
221        self.raw.write(buf);
222    }
223}
224
225impl Read for PublicKey {
226    type Cfg = ();
227
228    fn read_cfg(buf: &mut impl Buf, _: &()) -> Result<Self, CodecError> {
229        let raw = <[u8; Self::SIZE]>::read(buf)?;
230        let key = VerificationKey::try_from(raw)
231            .map_err(|e| CodecError::Wrapped(CURVE_NAME, e.into()))?;
232        Ok(Self { raw, key })
233    }
234}
235
236impl FixedSize for PublicKey {
237    const SIZE: usize = PUBLIC_KEY_LENGTH;
238}
239
240impl Array for PublicKey {}
241
242impl AsRef<[u8]> for PublicKey {
243    fn as_ref(&self) -> &[u8] {
244        &self.raw
245    }
246}
247
248impl Deref for PublicKey {
249    type Target = [u8];
250    fn deref(&self) -> &[u8] {
251        &self.raw
252    }
253}
254
255impl From<VerificationKey> for PublicKey {
256    fn from(key: VerificationKey) -> Self {
257        let raw = key.to_bytes();
258        Self { raw, key }
259    }
260}
261
262impl Debug for PublicKey {
263    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
264        write!(f, "{}", hex(&self.raw))
265    }
266}
267
268impl Display for PublicKey {
269    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
270        write!(f, "{}", hex(&self.raw))
271    }
272}
273
274/// Ed25519 Signature.
275#[derive(Clone, Eq, PartialEq)]
276pub struct Signature {
277    raw: [u8; SIGNATURE_LENGTH],
278    signature: ed25519_consensus::Signature,
279}
280
281impl Write for Signature {
282    fn write(&self, buf: &mut impl BufMut) {
283        self.raw.write(buf);
284    }
285}
286
287impl Read for Signature {
288    type Cfg = ();
289
290    fn read_cfg(buf: &mut impl Buf, _: &()) -> Result<Self, CodecError> {
291        let raw = <[u8; Self::SIZE]>::read(buf)?;
292        let signature = ed25519_consensus::Signature::from(raw);
293        Ok(Self { raw, signature })
294    }
295}
296
297impl FixedSize for Signature {
298    const SIZE: usize = SIGNATURE_LENGTH;
299}
300
301impl Array for Signature {}
302
303impl Hash for Signature {
304    fn hash<H: Hasher>(&self, state: &mut H) {
305        self.raw.hash(state);
306    }
307}
308
309impl Ord for Signature {
310    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
311        self.raw.cmp(&other.raw)
312    }
313}
314
315impl PartialOrd for Signature {
316    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
317        Some(self.cmp(other))
318    }
319}
320
321impl AsRef<[u8]> for Signature {
322    fn as_ref(&self) -> &[u8] {
323        &self.raw
324    }
325}
326
327impl Deref for Signature {
328    type Target = [u8];
329    fn deref(&self) -> &[u8] {
330        &self.raw
331    }
332}
333
334impl From<ed25519_consensus::Signature> for Signature {
335    fn from(value: ed25519_consensus::Signature) -> Self {
336        let raw = value.to_bytes();
337        Self {
338            raw,
339            signature: value,
340        }
341    }
342}
343
344impl Debug for Signature {
345    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
346        write!(f, "{}", hex(&self.raw))
347    }
348}
349
350impl Display for Signature {
351    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
352        write!(f, "{}", hex(&self.raw))
353    }
354}
355
356/// Test vectors sourced from https://datatracker.ietf.org/doc/html/rfc8032#section-7.1.
357#[cfg(test)]
358mod tests {
359    use super::*;
360    use commonware_codec::{DecodeExt, Encode};
361    use rand::rngs::OsRng;
362
363    fn test_sign_and_verify(
364        private_key: PrivateKey,
365        public_key: PublicKey,
366        message: &[u8],
367        signature: Signature,
368    ) {
369        let mut signer = Ed25519::from(private_key);
370        let computed_signature = signer.sign(None, message);
371        assert_eq!(computed_signature, signature);
372        assert!(Ed25519::verify(
373            None,
374            message,
375            &public_key,
376            &computed_signature
377        ));
378    }
379
380    fn parse_private_key(private_key: &str) -> PrivateKey {
381        PrivateKey::decode(
382            commonware_utils::from_hex_formatted(private_key)
383                .unwrap()
384                .as_ref(),
385        )
386        .unwrap()
387    }
388
389    fn parse_public_key(public_key: &str) -> PublicKey {
390        PublicKey::decode(
391            commonware_utils::from_hex_formatted(public_key)
392                .unwrap()
393                .as_ref(),
394        )
395        .unwrap()
396    }
397
398    fn parse_signature(signature: &str) -> Signature {
399        Signature::decode(
400            commonware_utils::from_hex_formatted(signature)
401                .unwrap()
402                .as_ref(),
403        )
404        .unwrap()
405    }
406
407    fn vector_1() -> (PrivateKey, PublicKey, Vec<u8>, Signature) {
408        (
409            // secret key
410            parse_private_key(
411                "
412                9d61b19deffd5a60ba844af492ec2cc4
413                4449c5697b326919703bac031cae7f60
414                ",
415            ),
416            // public key
417            parse_public_key(
418                "
419                d75a980182b10ab7d54bfed3c964073a
420                0ee172f3daa62325af021a68f707511a
421                ",
422            ),
423            // message
424            b"".to_vec(),
425            // signature
426            parse_signature(
427                "
428                e5564300c360ac729086e2cc806e828a
429                84877f1eb8e5d974d873e06522490155
430                5fb8821590a33bacc61e39701cf9b46b
431                d25bf5f0595bbe24655141438e7a100b
432                ",
433            ),
434        )
435    }
436
437    fn vector_2() -> (PrivateKey, PublicKey, Vec<u8>, Signature) {
438        (
439            // secret key
440            parse_private_key(
441                "
442                4ccd089b28ff96da9db6c346ec114e0f
443                5b8a319f35aba624da8cf6ed4fb8a6fb
444                ",
445            ),
446            // public key
447            parse_public_key(
448                "
449                3d4017c3e843895a92b70aa74d1b7ebc
450                9c982ccf2ec4968cc0cd55f12af4660c
451                ",
452            ),
453            // message
454            [0x72].to_vec(),
455            // signature
456            parse_signature(
457                "
458                92a009a9f0d4cab8720e820b5f642540
459                a2b27b5416503f8fb3762223ebdb69da
460                085ac1e43e15996e458f3613d0f11d8c
461                387b2eaeb4302aeeb00d291612bb0c00
462                ",
463            ),
464        )
465    }
466
467    #[test]
468    fn test_codec_private_key() {
469        let private_key = parse_private_key(
470            "
471            9d61b19deffd5a60ba844af492ec2cc4
472            4449c5697b326919703bac031cae7f60
473            ",
474        );
475        let encoded = private_key.encode();
476        assert_eq!(encoded.len(), PRIVATE_KEY_LENGTH);
477        let decoded = PrivateKey::decode(encoded).unwrap();
478        assert_eq!(private_key, decoded);
479    }
480
481    #[test]
482    fn test_codec_public_key() {
483        let public_key = parse_public_key(
484            "
485            d75a980182b10ab7d54bfed3c964073a
486            0ee172f3daa62325af021a68f707511a
487            ",
488        );
489        let encoded = public_key.encode();
490        assert_eq!(encoded.len(), PUBLIC_KEY_LENGTH);
491        let decoded = PublicKey::decode(encoded).unwrap();
492        assert_eq!(public_key, decoded);
493    }
494
495    #[test]
496    fn test_codec_signature() {
497        let signature = parse_signature(
498            "
499            e5564300c360ac729086e2cc806e828a
500            84877f1eb8e5d974d873e06522490155
501            5fb8821590a33bacc61e39701cf9b46b
502            d25bf5f0595bbe24655141438e7a100b
503            ",
504        );
505        let encoded = signature.encode();
506        assert_eq!(encoded.len(), SIGNATURE_LENGTH);
507        let decoded = Signature::decode(encoded).unwrap();
508        assert_eq!(signature, decoded);
509    }
510
511    #[test]
512    fn rfc8032_test_vector_1() {
513        let (private_key, public_key, message, signature) = vector_1();
514        test_sign_and_verify(private_key, public_key, &message, signature)
515    }
516
517    // sanity check the test infra rejects bad signatures
518    #[test]
519    #[should_panic]
520    fn bad_signature() {
521        let (private_key, public_key, message, _) = vector_1();
522        let mut signer = <Ed25519 as Signer>::new(&mut OsRng);
523        let bad_signature = signer.sign(None, message.as_ref());
524        test_sign_and_verify(private_key, public_key, &message, bad_signature);
525    }
526
527    // sanity check the test infra rejects non-matching messages
528    #[test]
529    #[should_panic]
530    fn different_message() {
531        let (private_key, public_key, _, signature) = vector_1();
532        let different_message = b"this is a different message".to_vec();
533        test_sign_and_verify(private_key, public_key, &different_message, signature);
534    }
535
536    #[test]
537    fn rfc8032_test_vector_2() {
538        let (private_key, public_key, message, signature) = vector_2();
539        test_sign_and_verify(private_key, public_key, &message, signature)
540    }
541
542    #[test]
543    fn rfc8032_test_vector_3() {
544        let private_key = parse_private_key(
545            "
546            c5aa8df43f9f837bedb7442f31dcb7b1
547            66d38535076f094b85ce3a2e0b4458f7
548            ",
549        );
550        let public_key = parse_public_key(
551            "
552            fc51cd8e6218a1a38da47ed00230f058
553            0816ed13ba3303ac5deb911548908025
554            ",
555        );
556        let message: [u8; 2] = [0xaf, 0x82];
557        let signature = parse_signature(
558            "
559            6291d657deec24024827e69c3abe01a3
560            0ce548a284743a445e3680d7db5ac3ac
561            18ff9b538d16f290ae67f760984dc659
562            4a7c15e9716ed28dc027beceea1ec40a
563            ",
564        );
565        test_sign_and_verify(private_key, public_key, &message, signature)
566    }
567
568    #[test]
569    fn rfc8032_test_vector_1024() {
570        let private_key = parse_private_key(
571            "
572            f5e5767cf153319517630f226876b86c
573            8160cc583bc013744c6bf255f5cc0ee5
574            ",
575        );
576        let public_key = parse_public_key(
577            "
578            278117fc144c72340f67d0f2316e8386
579            ceffbf2b2428c9c51fef7c597f1d426e
580            ",
581        );
582        let message = commonware_utils::from_hex_formatted(
583            "
584            08b8b2b733424243760fe426a4b54908
585            632110a66c2f6591eabd3345e3e4eb98
586            fa6e264bf09efe12ee50f8f54e9f77b1
587            e355f6c50544e23fb1433ddf73be84d8
588            79de7c0046dc4996d9e773f4bc9efe57
589            38829adb26c81b37c93a1b270b20329d
590            658675fc6ea534e0810a4432826bf58c
591            941efb65d57a338bbd2e26640f89ffbc
592            1a858efcb8550ee3a5e1998bd177e93a
593            7363c344fe6b199ee5d02e82d522c4fe
594            ba15452f80288a821a579116ec6dad2b
595            3b310da903401aa62100ab5d1a36553e
596            06203b33890cc9b832f79ef80560ccb9
597            a39ce767967ed628c6ad573cb116dbef
598            efd75499da96bd68a8a97b928a8bbc10
599            3b6621fcde2beca1231d206be6cd9ec7
600            aff6f6c94fcd7204ed3455c68c83f4a4
601            1da4af2b74ef5c53f1d8ac70bdcb7ed1
602            85ce81bd84359d44254d95629e9855a9
603            4a7c1958d1f8ada5d0532ed8a5aa3fb2
604            d17ba70eb6248e594e1a2297acbbb39d
605            502f1a8c6eb6f1ce22b3de1a1f40cc24
606            554119a831a9aad6079cad88425de6bd
607            e1a9187ebb6092cf67bf2b13fd65f270
608            88d78b7e883c8759d2c4f5c65adb7553
609            878ad575f9fad878e80a0c9ba63bcbcc
610            2732e69485bbc9c90bfbd62481d9089b
611            eccf80cfe2df16a2cf65bd92dd597b07
612            07e0917af48bbb75fed413d238f5555a
613            7a569d80c3414a8d0859dc65a46128ba
614            b27af87a71314f318c782b23ebfe808b
615            82b0ce26401d2e22f04d83d1255dc51a
616            ddd3b75a2b1ae0784504df543af8969b
617            e3ea7082ff7fc9888c144da2af58429e
618            c96031dbcad3dad9af0dcbaaaf268cb8
619            fcffead94f3c7ca495e056a9b47acdb7
620            51fb73e666c6c655ade8297297d07ad1
621            ba5e43f1bca32301651339e22904cc8c
622            42f58c30c04aafdb038dda0847dd988d
623            cda6f3bfd15c4b4c4525004aa06eeff8
624            ca61783aacec57fb3d1f92b0fe2fd1a8
625            5f6724517b65e614ad6808d6f6ee34df
626            f7310fdc82aebfd904b01e1dc54b2927
627            094b2db68d6f903b68401adebf5a7e08
628            d78ff4ef5d63653a65040cf9bfd4aca7
629            984a74d37145986780fc0b16ac451649
630            de6188a7dbdf191f64b5fc5e2ab47b57
631            f7f7276cd419c17a3ca8e1b939ae49e4
632            88acba6b965610b5480109c8b17b80e1
633            b7b750dfc7598d5d5011fd2dcc5600a3
634            2ef5b52a1ecc820e308aa342721aac09
635            43bf6686b64b2579376504ccc493d97e
636            6aed3fb0f9cd71a43dd497f01f17c0e2
637            cb3797aa2a2f256656168e6c496afc5f
638            b93246f6b1116398a346f1a641f3b041
639            e989f7914f90cc2c7fff357876e506b5
640            0d334ba77c225bc307ba537152f3f161
641            0e4eafe595f6d9d90d11faa933a15ef1
642            369546868a7f3a45a96768d40fd9d034
643            12c091c6315cf4fde7cb68606937380d
644            b2eaaa707b4c4185c32eddcdd306705e
645            4dc1ffc872eeee475a64dfac86aba41c
646            0618983f8741c5ef68d3a101e8a3b8ca
647            c60c905c15fc910840b94c00a0b9d0
648            ",
649        )
650        .unwrap();
651        let signature = parse_signature(
652            "
653            0aab4c900501b3e24d7cdf4663326a3a
654            87df5e4843b2cbdb67cbf6e460fec350
655            aa5371b1508f9f4528ecea23c436d94b
656            5e8fcd4f681e30a6ac00a9704a188a03
657            ",
658        );
659        test_sign_and_verify(private_key, public_key, &message, signature)
660    }
661
662    #[test]
663    fn rfc8032_test_vector_sha() {
664        let private_key = commonware_utils::from_hex_formatted(
665            "
666            833fe62409237b9d62ec77587520911e
667            9a759cec1d19755b7da901b96dca3d42
668            ",
669        )
670        .unwrap();
671        let public_key = commonware_utils::from_hex_formatted(
672            "
673            ec172b93ad5e563bf4932c70e1245034
674            c35467ef2efd4d64ebf819683467e2bf
675            ",
676        )
677        .unwrap();
678        let message = commonware_utils::from_hex_formatted(
679            "
680            ddaf35a193617abacc417349ae204131
681            12e6fa4e89a97ea20a9eeee64b55d39a
682            2192992a274fc1a836ba3c23a3feebbd
683            454d4423643ce80e2a9ac94fa54ca49f
684            ",
685        )
686        .unwrap();
687        let signature = commonware_utils::from_hex_formatted(
688            "
689            dc2a4459e7369633a52b1bf277839a00
690            201009a3efbf3ecb69bea2186c26b589
691            09351fc9ac90b3ecfdfbc7c66431e030
692            3dca179c138ac17ad9bef1177331a704
693            ",
694        )
695        .unwrap();
696        test_sign_and_verify(
697            PrivateKey::decode(private_key.as_ref()).unwrap(),
698            PublicKey::decode(public_key.as_ref()).unwrap(),
699            &message,
700            Signature::decode(signature.as_ref()).unwrap(),
701        )
702    }
703
704    #[test]
705    fn batch_verify_valid() {
706        let v1 = vector_1();
707        let v2 = vector_2();
708        let mut batch = Ed25519Batch::new();
709        assert!(batch.add(None, &v1.2, &v1.1, &v1.3));
710        assert!(batch.add(None, &v2.2, &v2.1, &v2.3));
711        assert!(batch.verify(&mut rand::thread_rng()));
712    }
713
714    #[test]
715    fn batch_verify_invalid() {
716        let v1 = vector_1();
717        let v2 = vector_2();
718        let mut bad_signature = v2.3.to_vec();
719        bad_signature[3] = 0xff;
720
721        let mut batch = Ed25519Batch::new();
722        assert!(batch.add(None, &v1.2, &v1.1, &v1.3));
723        assert!(batch.add(
724            None,
725            &v2.2,
726            &v2.1,
727            &Signature::decode(bad_signature.as_ref()).unwrap()
728        ));
729        assert!(!batch.verify(&mut rand::thread_rng()));
730    }
731
732    #[test]
733    fn test_zero_signature_fails() {
734        let (_, public_key, message, _) = vector_1();
735        let zero_sig = Signature::decode(vec![0u8; Signature::SIZE].as_ref()).unwrap();
736        assert!(!Ed25519::verify(None, &message, &public_key, &zero_sig));
737    }
738
739    #[test]
740    fn test_high_s_fails() {
741        let (_, public_key, message, signature) = vector_1();
742        let mut bad_signature = signature.to_vec();
743        bad_signature[63] |= 0x80; // make S non-canonical
744        let bad_signature = Signature::decode(bad_signature.as_ref()).unwrap();
745        assert!(!Ed25519::verify(
746            None,
747            &message,
748            &public_key,
749            &bad_signature
750        ));
751    }
752
753    #[test]
754    fn test_invalid_r_fails() {
755        let (_, public_key, message, signature) = vector_1();
756        let mut bad_signature = signature.to_vec();
757        for b in bad_signature.iter_mut().take(32) {
758            *b = 0xff; // invalid R component
759        }
760        let bad_signature = Signature::decode(bad_signature.as_ref()).unwrap();
761        assert!(!Ed25519::verify(
762            None,
763            &message,
764            &public_key,
765            &bad_signature
766        ));
767    }
768}
commonware_cryptography/ed25519/scheme.rs

commonware_cryptography/ed25519/
scheme.rs
