commonware_cryptography/ed25519/
scheme.rs

1use crate::{Array, PrivateKeyExt};
2cfg_if::cfg_if! {
3    if #[cfg(feature = "std")] {
4        use crate::BatchVerifier;
5        use std::borrow::{Cow, ToOwned};
6        use rand::RngCore;
7    } else {
8        use alloc::borrow::ToOwned;
9    }
10}
11use bytes::{Buf, BufMut};
12use commonware_codec::{Error as CodecError, FixedSize, Read, ReadExt, Write};
13use commonware_utils::{hex, union_unique, Span};
14use core::{
15    fmt::{Debug, Display},
16    hash::{Hash, Hasher},
17    ops::Deref,
18};
19use ed25519_consensus::{self, VerificationKey};
20use rand::{CryptoRng, Rng};
21use zeroize::{Zeroize, ZeroizeOnDrop};
22
23const CURVE_NAME: &str = "ed25519";
24const PRIVATE_KEY_LENGTH: usize = 32;
25const PUBLIC_KEY_LENGTH: usize = 32;
26const SIGNATURE_LENGTH: usize = 64;
27
28/// Ed25519 Private Key.
29#[derive(Clone, Zeroize, ZeroizeOnDrop)]
30pub struct PrivateKey {
31    raw: [u8; PRIVATE_KEY_LENGTH],
32    key: ed25519_consensus::SigningKey,
33}
34
35impl crate::PrivateKey for PrivateKey {}
36
37impl crate::Signer for PrivateKey {
38    type Signature = Signature;
39    type PublicKey = PublicKey;
40
41    fn sign(&self, namespace: Option<&[u8]>, msg: &[u8]) -> Self::Signature {
42        let sig = match namespace {
43            Some(namespace) => self.key.sign(&union_unique(namespace, msg)),
44            None => self.key.sign(msg),
45        };
46        Signature::from(sig)
47    }
48
49    fn public_key(&self) -> Self::PublicKey {
50        let raw = self.key.verification_key().to_bytes();
51        Self::PublicKey {
52            raw,
53            key: self.key.verification_key().to_owned(),
54        }
55    }
56}
57
58impl PrivateKeyExt for PrivateKey {
59    fn from_rng<R: Rng + CryptoRng>(rng: &mut R) -> Self {
60        let key = ed25519_consensus::SigningKey::new(rng);
61        let raw = key.to_bytes();
62        Self { raw, key }
63    }
64}
65
66impl Write for PrivateKey {
67    fn write(&self, buf: &mut impl BufMut) {
68        self.raw.write(buf);
69    }
70}
71
72impl Read for PrivateKey {
73    type Cfg = ();
74
75    fn read_cfg(buf: &mut impl Buf, _: &()) -> Result<Self, CodecError> {
76        let raw = <[u8; Self::SIZE]>::read(buf)?;
77        let key = ed25519_consensus::SigningKey::from(raw);
78        Ok(Self { raw, key })
79    }
80}
81
82impl FixedSize for PrivateKey {
83    const SIZE: usize = PRIVATE_KEY_LENGTH;
84}
85
86impl Span for PrivateKey {}
87
88impl Array for PrivateKey {}
89
90impl Eq for PrivateKey {}
91
92impl Hash for PrivateKey {
93    fn hash<H: Hasher>(&self, state: &mut H) {
94        self.raw.hash(state);
95    }
96}
97
98impl PartialEq for PrivateKey {
99    fn eq(&self, other: &Self) -> bool {
100        self.raw == other.raw
101    }
102}
103
104impl Ord for PrivateKey {
105    fn cmp(&self, other: &Self) -> core::cmp::Ordering {
106        self.raw.cmp(&other.raw)
107    }
108}
109
110impl PartialOrd for PrivateKey {
111    fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
112        Some(self.cmp(other))
113    }
114}
115
116impl AsRef<[u8]> for PrivateKey {
117    fn as_ref(&self) -> &[u8] {
118        &self.raw
119    }
120}
121
122impl Deref for PrivateKey {
123    type Target = [u8];
124    fn deref(&self) -> &[u8] {
125        &self.raw
126    }
127}
128
129impl From<ed25519_consensus::SigningKey> for PrivateKey {
130    fn from(key: ed25519_consensus::SigningKey) -> Self {
131        let raw = key.to_bytes();
132        Self { raw, key }
133    }
134}
135
136impl Debug for PrivateKey {
137    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
138        write!(f, "{}", hex(&self.raw))
139    }
140}
141
142impl Display for PrivateKey {
143    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
144        write!(f, "{}", hex(&self.raw))
145    }
146}
147
148/// Ed25519 Public Key.
149#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
150pub struct PublicKey {
151    raw: [u8; PUBLIC_KEY_LENGTH],
152    key: ed25519_consensus::VerificationKey,
153}
154
155impl From<PrivateKey> for PublicKey {
156    fn from(value: PrivateKey) -> Self {
157        let raw = value.key.verification_key().to_bytes();
158        Self {
159            raw,
160            key: value.key.verification_key(),
161        }
162    }
163}
164
165impl crate::PublicKey for PublicKey {}
166
167impl crate::Verifier for PublicKey {
168    type Signature = Signature;
169
170    fn verify(&self, namespace: Option<&[u8]>, msg: &[u8], sig: &Self::Signature) -> bool {
171        match namespace {
172            Some(namespace) => {
173                let payload = union_unique(namespace, msg);
174                self.key.verify(&sig.signature, &payload).is_ok()
175            }
176            None => self.key.verify(&sig.signature, msg).is_ok(),
177        }
178    }
179}
180
181impl Write for PublicKey {
182    fn write(&self, buf: &mut impl BufMut) {
183        self.raw.write(buf);
184    }
185}
186
187impl Read for PublicKey {
188    type Cfg = ();
189
190    fn read_cfg(buf: &mut impl Buf, _: &()) -> Result<Self, CodecError> {
191        let raw = <[u8; Self::SIZE]>::read(buf)?;
192        let result = VerificationKey::try_from(raw);
193        #[cfg(feature = "std")]
194        let key = result.map_err(|e| CodecError::Wrapped(CURVE_NAME, e.into()))?;
195        #[cfg(not(feature = "std"))]
196        let key = result
197            .map_err(|e| CodecError::Wrapped(CURVE_NAME, alloc::format!("{:?}", e).into()))?;
198
199        Ok(Self { raw, key })
200    }
201}
202
203impl FixedSize for PublicKey {
204    const SIZE: usize = PUBLIC_KEY_LENGTH;
205}
206
207impl Span for PublicKey {}
208
209impl Array for PublicKey {}
210
211impl AsRef<[u8]> for PublicKey {
212    fn as_ref(&self) -> &[u8] {
213        &self.raw
214    }
215}
216
217impl Deref for PublicKey {
218    type Target = [u8];
219    fn deref(&self) -> &[u8] {
220        &self.raw
221    }
222}
223
224impl From<VerificationKey> for PublicKey {
225    fn from(key: VerificationKey) -> Self {
226        let raw = key.to_bytes();
227        Self { raw, key }
228    }
229}
230
231impl Debug for PublicKey {
232    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
233        write!(f, "{}", hex(&self.raw))
234    }
235}
236
237impl Display for PublicKey {
238    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
239        write!(f, "{}", hex(&self.raw))
240    }
241}
242
243/// Ed25519 Signature.
244#[derive(Clone, Eq, PartialEq)]
245pub struct Signature {
246    raw: [u8; SIGNATURE_LENGTH],
247    signature: ed25519_consensus::Signature,
248}
249
250impl crate::Signature for Signature {}
251
252impl Write for Signature {
253    fn write(&self, buf: &mut impl BufMut) {
254        self.raw.write(buf);
255    }
256}
257
258impl Read for Signature {
259    type Cfg = ();
260
261    fn read_cfg(buf: &mut impl Buf, _: &()) -> Result<Self, CodecError> {
262        let raw = <[u8; Self::SIZE]>::read(buf)?;
263        let signature = ed25519_consensus::Signature::from(raw);
264        Ok(Self { raw, signature })
265    }
266}
267
268impl FixedSize for Signature {
269    const SIZE: usize = SIGNATURE_LENGTH;
270}
271
272impl Span for Signature {}
273
274impl Array for Signature {}
275
276impl Hash for Signature {
277    fn hash<H: Hasher>(&self, state: &mut H) {
278        self.raw.hash(state);
279    }
280}
281
282impl Ord for Signature {
283    fn cmp(&self, other: &Self) -> core::cmp::Ordering {
284        self.raw.cmp(&other.raw)
285    }
286}
287
288impl PartialOrd for Signature {
289    fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
290        Some(self.cmp(other))
291    }
292}
293
294impl AsRef<[u8]> for Signature {
295    fn as_ref(&self) -> &[u8] {
296        &self.raw
297    }
298}
299
300impl Deref for Signature {
301    type Target = [u8];
302    fn deref(&self) -> &[u8] {
303        &self.raw
304    }
305}
306
307impl From<ed25519_consensus::Signature> for Signature {
308    fn from(value: ed25519_consensus::Signature) -> Self {
309        let raw = value.to_bytes();
310        Self {
311            raw,
312            signature: value,
313        }
314    }
315}
316
317impl Debug for Signature {
318    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
319        write!(f, "{}", hex(&self.raw))
320    }
321}
322
323impl Display for Signature {
324    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
325        write!(f, "{}", hex(&self.raw))
326    }
327}
328
329/// Ed25519 Batch Verifier.
330#[cfg(feature = "std")]
331pub struct Batch {
332    verifier: ed25519_consensus::batch::Verifier,
333}
334
335#[cfg(feature = "std")]
336impl BatchVerifier<PublicKey> for Batch {
337    fn new() -> Self {
338        Batch {
339            verifier: ed25519_consensus::batch::Verifier::new(),
340        }
341    }
342
343    fn add(
344        &mut self,
345        namespace: Option<&[u8]>,
346        message: &[u8],
347        public_key: &PublicKey,
348        signature: &Signature,
349    ) -> bool {
350        let payload = match namespace {
351            Some(namespace) => Cow::Owned(union_unique(namespace, message)),
352            None => Cow::Borrowed(message),
353        };
354        let item = ed25519_consensus::batch::Item::from((
355            public_key.key.into(),
356            signature.signature,
357            &payload,
358        ));
359        self.verifier.queue(item);
360        true
361    }
362
363    fn verify<R: RngCore + CryptoRng>(self, rng: &mut R) -> bool {
364        self.verifier.verify(rng).is_ok()
365    }
366}
367
368/// Test vectors sourced from https://datatracker.ietf.org/doc/html/rfc8032#section-7.1.
369#[cfg(test)]
370mod tests {
371    use super::*;
372    use crate::{ed25519, Signer as _, Verifier as _};
373    use commonware_codec::{DecodeExt, Encode};
374    use rand::rngs::OsRng;
375
376    fn test_sign_and_verify(
377        private_key: PrivateKey,
378        public_key: PublicKey,
379        message: &[u8],
380        signature: Signature,
381    ) {
382        let computed_signature = private_key.sign(None, message);
383        assert_eq!(computed_signature, signature);
384        assert!(public_key.verify(None, message, &computed_signature));
385    }
386
387    fn parse_private_key(private_key: &str) -> PrivateKey {
388        PrivateKey::decode(
389            commonware_utils::from_hex_formatted(private_key)
390                .unwrap()
391                .as_ref(),
392        )
393        .unwrap()
394    }
395
396    fn parse_public_key(public_key: &str) -> PublicKey {
397        PublicKey::decode(
398            commonware_utils::from_hex_formatted(public_key)
399                .unwrap()
400                .as_ref(),
401        )
402        .unwrap()
403    }
404
405    fn parse_signature(signature: &str) -> Signature {
406        Signature::decode(
407            commonware_utils::from_hex_formatted(signature)
408                .unwrap()
409                .as_ref(),
410        )
411        .unwrap()
412    }
413
414    fn vector_1() -> (PrivateKey, PublicKey, Vec<u8>, Signature) {
415        (
416            // secret key
417            parse_private_key(
418                "
419                9d61b19deffd5a60ba844af492ec2cc4
420                4449c5697b326919703bac031cae7f60
421                ",
422            ),
423            // public key
424            parse_public_key(
425                "
426                d75a980182b10ab7d54bfed3c964073a
427                0ee172f3daa62325af021a68f707511a
428                ",
429            ),
430            // message
431            b"".to_vec(),
432            // signature
433            parse_signature(
434                "
435                e5564300c360ac729086e2cc806e828a
436                84877f1eb8e5d974d873e06522490155
437                5fb8821590a33bacc61e39701cf9b46b
438                d25bf5f0595bbe24655141438e7a100b
439                ",
440            ),
441        )
442    }
443
444    fn vector_2() -> (PrivateKey, PublicKey, Vec<u8>, Signature) {
445        (
446            // secret key
447            parse_private_key(
448                "
449                4ccd089b28ff96da9db6c346ec114e0f
450                5b8a319f35aba624da8cf6ed4fb8a6fb
451                ",
452            ),
453            // public key
454            parse_public_key(
455                "
456                3d4017c3e843895a92b70aa74d1b7ebc
457                9c982ccf2ec4968cc0cd55f12af4660c
458                ",
459            ),
460            // message
461            [0x72].to_vec(),
462            // signature
463            parse_signature(
464                "
465                92a009a9f0d4cab8720e820b5f642540
466                a2b27b5416503f8fb3762223ebdb69da
467                085ac1e43e15996e458f3613d0f11d8c
468                387b2eaeb4302aeeb00d291612bb0c00
469                ",
470            ),
471        )
472    }
473
474    #[test]
475    fn test_codec_private_key() {
476        let private_key = parse_private_key(
477            "
478            9d61b19deffd5a60ba844af492ec2cc4
479            4449c5697b326919703bac031cae7f60
480            ",
481        );
482        let encoded = private_key.encode();
483        assert_eq!(encoded.len(), PRIVATE_KEY_LENGTH);
484        let decoded = PrivateKey::decode(encoded).unwrap();
485        assert_eq!(private_key, decoded);
486    }
487
488    #[test]
489    fn test_codec_public_key() {
490        let public_key = parse_public_key(
491            "
492            d75a980182b10ab7d54bfed3c964073a
493            0ee172f3daa62325af021a68f707511a
494            ",
495        );
496        let encoded = public_key.encode();
497        assert_eq!(encoded.len(), PUBLIC_KEY_LENGTH);
498        let decoded = PublicKey::decode(encoded).unwrap();
499        assert_eq!(public_key, decoded);
500    }
501
502    #[test]
503    fn test_codec_signature() {
504        let signature = parse_signature(
505            "
506            e5564300c360ac729086e2cc806e828a
507            84877f1eb8e5d974d873e06522490155
508            5fb8821590a33bacc61e39701cf9b46b
509            d25bf5f0595bbe24655141438e7a100b
510            ",
511        );
512        let encoded = signature.encode();
513        assert_eq!(encoded.len(), SIGNATURE_LENGTH);
514        let decoded = Signature::decode(encoded).unwrap();
515        assert_eq!(signature, decoded);
516    }
517
518    #[test]
519    fn rfc8032_test_vector_1() {
520        let (private_key, public_key, message, signature) = vector_1();
521        test_sign_and_verify(private_key, public_key, &message, signature)
522    }
523
524    // sanity check the test infra rejects bad signatures
525    #[test]
526    #[should_panic]
527    fn bad_signature() {
528        let (private_key, public_key, message, _) = vector_1();
529        let private_key_2 = PrivateKey::from_rng(&mut OsRng);
530        let bad_signature = private_key_2.sign(None, message.as_ref());
531        test_sign_and_verify(private_key, public_key, &message, bad_signature);
532    }
533
534    // sanity check the test infra rejects non-matching messages
535    #[test]
536    #[should_panic]
537    fn different_message() {
538        let (private_key, public_key, _, signature) = vector_1();
539        let different_message = b"this is a different message".to_vec();
540        test_sign_and_verify(private_key, public_key, &different_message, signature);
541    }
542
543    #[test]
544    fn rfc8032_test_vector_2() {
545        let (private_key, public_key, message, signature) = vector_2();
546        test_sign_and_verify(private_key, public_key, &message, signature)
547    }
548
549    #[test]
550    fn rfc8032_test_vector_3() {
551        let private_key = parse_private_key(
552            "
553            c5aa8df43f9f837bedb7442f31dcb7b1
554            66d38535076f094b85ce3a2e0b4458f7
555            ",
556        );
557        let public_key = parse_public_key(
558            "
559            fc51cd8e6218a1a38da47ed00230f058
560            0816ed13ba3303ac5deb911548908025
561            ",
562        );
563        let message: [u8; 2] = [0xaf, 0x82];
564        let signature = parse_signature(
565            "
566            6291d657deec24024827e69c3abe01a3
567            0ce548a284743a445e3680d7db5ac3ac
568            18ff9b538d16f290ae67f760984dc659
569            4a7c15e9716ed28dc027beceea1ec40a
570            ",
571        );
572        test_sign_and_verify(private_key, public_key, &message, signature)
573    }
574
575    #[test]
576    fn rfc8032_test_vector_1024() {
577        let private_key = parse_private_key(
578            "
579            f5e5767cf153319517630f226876b86c
580            8160cc583bc013744c6bf255f5cc0ee5
581            ",
582        );
583        let public_key = parse_public_key(
584            "
585            278117fc144c72340f67d0f2316e8386
586            ceffbf2b2428c9c51fef7c597f1d426e
587            ",
588        );
589        let message = commonware_utils::from_hex_formatted(
590            "
591            08b8b2b733424243760fe426a4b54908
592            632110a66c2f6591eabd3345e3e4eb98
593            fa6e264bf09efe12ee50f8f54e9f77b1
594            e355f6c50544e23fb1433ddf73be84d8
595            79de7c0046dc4996d9e773f4bc9efe57
596            38829adb26c81b37c93a1b270b20329d
597            658675fc6ea534e0810a4432826bf58c
598            941efb65d57a338bbd2e26640f89ffbc
599            1a858efcb8550ee3a5e1998bd177e93a
600            7363c344fe6b199ee5d02e82d522c4fe
601            ba15452f80288a821a579116ec6dad2b
602            3b310da903401aa62100ab5d1a36553e
603            06203b33890cc9b832f79ef80560ccb9
604            a39ce767967ed628c6ad573cb116dbef
605            efd75499da96bd68a8a97b928a8bbc10
606            3b6621fcde2beca1231d206be6cd9ec7
607            aff6f6c94fcd7204ed3455c68c83f4a4
608            1da4af2b74ef5c53f1d8ac70bdcb7ed1
609            85ce81bd84359d44254d95629e9855a9
610            4a7c1958d1f8ada5d0532ed8a5aa3fb2
611            d17ba70eb6248e594e1a2297acbbb39d
612            502f1a8c6eb6f1ce22b3de1a1f40cc24
613            554119a831a9aad6079cad88425de6bd
614            e1a9187ebb6092cf67bf2b13fd65f270
615            88d78b7e883c8759d2c4f5c65adb7553
616            878ad575f9fad878e80a0c9ba63bcbcc
617            2732e69485bbc9c90bfbd62481d9089b
618            eccf80cfe2df16a2cf65bd92dd597b07
619            07e0917af48bbb75fed413d238f5555a
620            7a569d80c3414a8d0859dc65a46128ba
621            b27af87a71314f318c782b23ebfe808b
622            82b0ce26401d2e22f04d83d1255dc51a
623            ddd3b75a2b1ae0784504df543af8969b
624            e3ea7082ff7fc9888c144da2af58429e
625            c96031dbcad3dad9af0dcbaaaf268cb8
626            fcffead94f3c7ca495e056a9b47acdb7
627            51fb73e666c6c655ade8297297d07ad1
628            ba5e43f1bca32301651339e22904cc8c
629            42f58c30c04aafdb038dda0847dd988d
630            cda6f3bfd15c4b4c4525004aa06eeff8
631            ca61783aacec57fb3d1f92b0fe2fd1a8
632            5f6724517b65e614ad6808d6f6ee34df
633            f7310fdc82aebfd904b01e1dc54b2927
634            094b2db68d6f903b68401adebf5a7e08
635            d78ff4ef5d63653a65040cf9bfd4aca7
636            984a74d37145986780fc0b16ac451649
637            de6188a7dbdf191f64b5fc5e2ab47b57
638            f7f7276cd419c17a3ca8e1b939ae49e4
639            88acba6b965610b5480109c8b17b80e1
640            b7b750dfc7598d5d5011fd2dcc5600a3
641            2ef5b52a1ecc820e308aa342721aac09
642            43bf6686b64b2579376504ccc493d97e
643            6aed3fb0f9cd71a43dd497f01f17c0e2
644            cb3797aa2a2f256656168e6c496afc5f
645            b93246f6b1116398a346f1a641f3b041
646            e989f7914f90cc2c7fff357876e506b5
647            0d334ba77c225bc307ba537152f3f161
648            0e4eafe595f6d9d90d11faa933a15ef1
649            369546868a7f3a45a96768d40fd9d034
650            12c091c6315cf4fde7cb68606937380d
651            b2eaaa707b4c4185c32eddcdd306705e
652            4dc1ffc872eeee475a64dfac86aba41c
653            0618983f8741c5ef68d3a101e8a3b8ca
654            c60c905c15fc910840b94c00a0b9d0
655            ",
656        )
657        .unwrap();
658        let signature = parse_signature(
659            "
660            0aab4c900501b3e24d7cdf4663326a3a
661            87df5e4843b2cbdb67cbf6e460fec350
662            aa5371b1508f9f4528ecea23c436d94b
663            5e8fcd4f681e30a6ac00a9704a188a03
664            ",
665        );
666        test_sign_and_verify(private_key, public_key, &message, signature)
667    }
668
669    #[test]
670    fn rfc8032_test_vector_sha() {
671        let private_key = commonware_utils::from_hex_formatted(
672            "
673            833fe62409237b9d62ec77587520911e
674            9a759cec1d19755b7da901b96dca3d42
675            ",
676        )
677        .unwrap();
678        let public_key = commonware_utils::from_hex_formatted(
679            "
680            ec172b93ad5e563bf4932c70e1245034
681            c35467ef2efd4d64ebf819683467e2bf
682            ",
683        )
684        .unwrap();
685        let message = commonware_utils::from_hex_formatted(
686            "
687            ddaf35a193617abacc417349ae204131
688            12e6fa4e89a97ea20a9eeee64b55d39a
689            2192992a274fc1a836ba3c23a3feebbd
690            454d4423643ce80e2a9ac94fa54ca49f
691            ",
692        )
693        .unwrap();
694        let signature = commonware_utils::from_hex_formatted(
695            "
696            dc2a4459e7369633a52b1bf277839a00
697            201009a3efbf3ecb69bea2186c26b589
698            09351fc9ac90b3ecfdfbc7c66431e030
699            3dca179c138ac17ad9bef1177331a704
700            ",
701        )
702        .unwrap();
703        test_sign_and_verify(
704            PrivateKey::decode(private_key.as_ref()).unwrap(),
705            PublicKey::decode(public_key.as_ref()).unwrap(),
706            &message,
707            Signature::decode(signature.as_ref()).unwrap(),
708        )
709    }
710
711    #[test]
712    fn batch_verify_valid() {
713        let v1 = vector_1();
714        let v2 = vector_2();
715        let mut batch = ed25519::Batch::new();
716        assert!(batch.add(None, &v1.2, &v1.1, &v1.3));
717        assert!(batch.add(None, &v2.2, &v2.1, &v2.3));
718        assert!(batch.verify(&mut rand::thread_rng()));
719    }
720
721    #[test]
722    fn batch_verify_invalid() {
723        let v1 = vector_1();
724        let v2 = vector_2();
725        let mut bad_signature = v2.3.to_vec();
726        bad_signature[3] = 0xff;
727
728        let mut batch = Batch::new();
729        assert!(batch.add(None, &v1.2, &v1.1, &v1.3));
730        assert!(batch.add(
731            None,
732            &v2.2,
733            &v2.1,
734            &Signature::decode(bad_signature.as_ref()).unwrap()
735        ));
736        assert!(!batch.verify(&mut rand::thread_rng()));
737    }
738
739    #[test]
740    fn test_zero_signature_fails() {
741        let (_, public_key, message, _) = vector_1();
742        let zero_sig = Signature::decode(vec![0u8; Signature::SIZE].as_ref()).unwrap();
743        assert!(!public_key.verify(None, &message, &zero_sig));
744    }
745
746    #[test]
747    fn test_high_s_fails() {
748        let (_, public_key, message, signature) = vector_1();
749        let mut bad_signature = signature.to_vec();
750        bad_signature[63] |= 0x80; // make S non-canonical
751        let bad_signature = Signature::decode(bad_signature.as_ref()).unwrap();
752        assert!(!public_key.verify(None, &message, &bad_signature));
753    }
754
755    #[test]
756    fn test_invalid_r_fails() {
757        let (_, public_key, message, signature) = vector_1();
758        let mut bad_signature = signature.to_vec();
759        for b in bad_signature.iter_mut().take(32) {
760            *b = 0xff; // invalid R component
761        }
762        let bad_signature = Signature::decode(bad_signature.as_ref()).unwrap();
763        assert!(!public_key.verify(None, &message, &bad_signature));
764    }
765}
commonware_cryptography/ed25519/scheme.rs

commonware_cryptography/ed25519/
scheme.rs
