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

commonware_cryptography/ed25519/
scheme.rs
