cashu/nuts/
nut02.rs

1//! NUT-02: Keysets and keyset ID
2//!
3//! <https://github.com/cashubtc/nuts/blob/main/02.md>
4
5use core::fmt;
6use core::str::FromStr;
7use std::array::TryFromSliceError;
8#[cfg(feature = "mint")]
9use std::collections::BTreeMap;
10
11#[cfg(feature = "mint")]
12use bitcoin::bip32::{ChildNumber, DerivationPath, Xpriv};
13use bitcoin::hashes::sha256::Hash as Sha256;
14use bitcoin::hashes::Hash;
15#[cfg(feature = "mint")]
16use bitcoin::key::Secp256k1;
17#[cfg(feature = "mint")]
18use bitcoin::secp256k1;
19use serde::{Deserialize, Deserializer, Serialize};
20use serde_with::{serde_as, VecSkipError};
21use thiserror::Error;
22
23use super::nut01::Keys;
24#[cfg(feature = "mint")]
25use super::nut01::{MintKeyPair, MintKeys};
26use crate::nuts::nut00::CurrencyUnit;
27use crate::util::hex;
28use crate::{ensure_cdk, Amount};
29
30/// NUT02 Error
31#[derive(Debug, Error)]
32pub enum Error {
33    /// Hex Error
34    #[error(transparent)]
35    HexError(#[from] hex::Error),
36    /// Keyset length error
37    #[error("NUT02: ID length invalid, expected 8 bytes (short/v1) or 33 bytes (v2)")]
38    Length,
39    /// Unknown version
40    #[error("NUT02: Unknown Version")]
41    UnknownVersion,
42    /// Keyset id does not match
43    #[error("Keyset id incorrect")]
44    IncorrectKeysetId,
45    /// Short keyset id does not match any of the provided IDv2s
46    #[error("Short keyset id does not match any of the provided IDv2s")]
47    UnknownShortKeysetId,
48    /// Short keyset id is ill-formed
49    #[error("Short keyset id is ill-formed")]
50    MalformedShortKeysetId,
51    /// Slice Error
52    #[error(transparent)]
53    Slice(#[from] TryFromSliceError),
54}
55
56/// Keyset version
57#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
58pub enum KeySetVersion {
59    /// Version 00
60    Version00,
61    /// Version 01
62    Version01,
63}
64
65impl KeySetVersion {
66    /// [`KeySetVersion`] to byte
67    pub fn to_byte(&self) -> u8 {
68        match self {
69            Self::Version00 => 0,
70            Self::Version01 => 1,
71        }
72    }
73
74    /// [`KeySetVersion`] from byte
75    pub fn from_byte(byte: &u8) -> Result<Self, Error> {
76        match byte {
77            0 => Ok(Self::Version00),
78            1 => Ok(Self::Version01),
79            _ => Err(Error::UnknownVersion),
80        }
81    }
82
83    /// [`KeySetVersion`] from proto value
84    pub fn from_proto_i32(value: i32) -> Result<Self, Error> {
85        match value {
86            1 => Ok(Self::Version00),
87            2 => Ok(Self::Version01),
88            _ => Err(Error::UnknownVersion),
89        }
90    }
91
92    /// [`KeySetVersion`] to proto value
93    pub fn to_proto_i32(&self) -> i32 {
94        match self {
95            Self::Version00 => 1,
96            Self::Version01 => 2,
97        }
98    }
99}
100
101impl fmt::Display for KeySetVersion {
102    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
103        match self {
104            KeySetVersion::Version00 => f.write_str("00"),
105            KeySetVersion::Version01 => f.write_str("01"),
106        }
107    }
108}
109
110/// Keyset ID bytes
111#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
112pub enum IdBytes {
113    /// Bytes for v1
114    V1([u8; 7]),
115    /// Bytes for v2
116    V2([u8; 32]),
117}
118
119impl IdBytes {
120    /// Convert [`IdBytes`] to [`Vec<u8>`]
121    pub fn to_vec(&self) -> Vec<u8> {
122        match self {
123            IdBytes::V1(bytes) => bytes.to_vec(),
124            IdBytes::V2(bytes) => bytes.to_vec(),
125        }
126    }
127}
128
129/// A keyset ID is an identifier for a specific keyset. It can be derived by
130/// anyone who knows the set of public keys of a mint. The keyset ID **CAN**
131/// be stored in a Cashu token such that the token can be used to identify
132/// which mint or keyset it was generated from.
133#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
134#[serde(into = "String", try_from = "String")]
135pub struct Id {
136    version: KeySetVersion,
137    id: IdBytes,
138}
139
140impl Id {
141    const STRLEN_V1: usize = 14;
142    const BYTELEN_V1: usize = 7;
143    const STRLEN_V2: usize = 64;
144    const BYTELEN_V2: usize = 32;
145
146    /// [`Id`] to bytes
147    pub fn to_bytes(&self) -> Vec<u8> {
148        [vec![self.version.to_byte()], self.id.to_vec()].concat()
149    }
150
151    /// [`Id`] from bytes
152    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
153        if bytes.is_empty() {
154            return Err(Error::Length);
155        }
156
157        let version = KeySetVersion::from_byte(&bytes[0])?;
158        let id = match version {
159            KeySetVersion::Version00 => IdBytes::V1(bytes[1..].try_into()?),
160            KeySetVersion::Version01 => IdBytes::V2(bytes[1..].try_into()?),
161        };
162        Ok(Self { version, id })
163    }
164
165    /// Get the version of the keyset
166    pub fn get_version(&self) -> KeySetVersion {
167        self.version
168    }
169
170    /// *** V2 KEYSET ***
171    /// create [`Id`] v2 from keys, unit and (optionally) expiry
172    /// 1 - sort public keys by their amount in ascending order
173    /// 2 - concatenate all public keys to one byte array
174    /// 3 - concatenate the lowercase unit string to the byte array (e.g. "unit:sat")
175    /// 4 - If a final expiration is specified, convert it into a radix-10 string and concatenate it (e.g "final_expiry:1896187313")
176    /// 5 - HASH_SHA256 the concatenated byte array and take the first 31 bytes
177    /// 6 - prefix it with a keyset ID version byte
178    ///
179    /// # Panics
180    ///
181    /// This function will not panic under normal circumstances as the hash output
182    /// is always valid hex and the correct length.
183    pub fn v2_from_data(
184        map: &Keys,
185        unit: &CurrencyUnit,
186        input_fee_ppk: u64,
187        expiry: Option<u64>,
188    ) -> Self {
189        let mut keys: Vec<(&Amount, &super::PublicKey)> = map.iter().collect();
190        keys.sort_by_key(|(amt, _v)| *amt);
191
192        let keys_string = keys
193            .iter()
194            .map(|(amt, pubkey)| format!("{}:{}", amt, hex::encode(pubkey.to_bytes())))
195            .collect::<Vec<String>>()
196            .join(",");
197
198        let mut data = keys_string;
199        data.push_str(&format!("|unit:{}", unit));
200
201        if input_fee_ppk > 0 {
202            data.push_str(&format!("|input_fee_ppk:{}", input_fee_ppk));
203        }
204
205        if let Some(expiry) = expiry {
206            if expiry > 0 {
207                data.push_str(&format!("|final_expiry:{}", expiry));
208            }
209        }
210
211        let hash = Sha256::hash(data.as_bytes());
212        let hex_of_hash = hex::encode(hash.to_byte_array());
213
214        Self {
215            version: KeySetVersion::Version01,
216            id: IdBytes::V2(
217                hex::decode(&hex_of_hash[0..Self::STRLEN_V2])
218                    .expect("Keys hash could not be hex decoded")
219                    .try_into()
220                    .expect("Invalid length of hex id"),
221            ),
222        }
223    }
224
225    /// *** V1 VERSION ***
226    /// As per NUT-02:
227    ///   1. sort public keys by their amount in ascending order
228    ///   2. concatenate all public keys to one string
229    ///   3. HASH_SHA256 the concatenated public keys
230    ///   4. take the first 14 characters of the hex-encoded hash
231    ///   5. prefix it with a keyset ID version byte
232    ///
233    /// # Panics
234    ///
235    /// This function will not panic under normal circumstances as the hash output
236    /// is always valid hex and the correct length.
237    pub fn v1_from_keys(map: &Keys) -> Self {
238        let mut keys: Vec<(&Amount, &super::PublicKey)> = map.iter().collect();
239        keys.sort_by_key(|(amt, _v)| *amt);
240
241        let pubkeys_concat: Vec<u8> = keys
242            .iter()
243            .map(|(_, pubkey)| pubkey.to_bytes())
244            .collect::<Vec<[u8; 33]>>()
245            .concat();
246
247        let hash = Sha256::hash(&pubkeys_concat);
248        let hex_of_hash = hex::encode(hash.to_byte_array());
249
250        Self {
251            version: KeySetVersion::Version00,
252            id: IdBytes::V1(
253                hex::decode(&hex_of_hash[0..Self::STRLEN_V1])
254                    .expect("Keys hash could not be hex decoded")
255                    .try_into()
256                    .expect("Invalid length of hex id"),
257            ),
258        }
259    }
260
261    /// Selects the correct IDv2 from a list of keysets and the given short-id
262    /// or returns the short-id in the case of v1.
263    pub fn from_short_keyset_id(
264        short_id: &ShortKeysetId,
265        keysets_info: &[KeySetInfo],
266    ) -> Result<Self, Error> {
267        // Check prefix length
268        if short_id.prefix.len() < Self::BYTELEN_V1 || short_id.prefix.len() > Self::BYTELEN_V2 {
269            return Err(Error::MalformedShortKeysetId);
270        }
271
272        match short_id.version {
273            KeySetVersion::Version00 => {
274                let mut idbytes: [u8; Self::BYTELEN_V1] = [0u8; Self::BYTELEN_V1];
275                idbytes.copy_from_slice(&short_id.prefix[..Self::BYTELEN_V1]);
276                Ok(Self {
277                    version: short_id.version,
278                    id: IdBytes::V1(idbytes),
279                })
280            }
281            KeySetVersion::Version01 => {
282                // We return the first match or error
283                for keyset_info in keysets_info.iter() {
284                    if keyset_info.id.version == KeySetVersion::Version01
285                        && keyset_info.id.id.to_vec().starts_with(&short_id.prefix)
286                    {
287                        return Ok(keyset_info.id);
288                    }
289                }
290                Err(Error::UnknownShortKeysetId)
291            }
292        }
293    }
294}
295
296// Used to generate a compressed unique identifier as part of the NUT13 spec
297// This is a one-way function
298impl From<Id> for u32 {
299    fn from(value: Id) -> Self {
300        let id_bytes = value.to_bytes();
301        let mut hex_bytes: [u8; 8] = [0; 8];
302        hex_bytes.copy_from_slice(&id_bytes[..8]);
303
304        let int = u64::from_be_bytes(hex_bytes);
305
306        (int % (2_u64.pow(31) - 1)) as u32
307    }
308}
309
310impl fmt::Display for Id {
311    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
312        let hex_id = match self.id {
313            IdBytes::V1(id) => hex::encode(id),
314            IdBytes::V2(id) => hex::encode(id),
315        };
316        f.write_str(&format!("{}{}", self.version, hex_id))
317    }
318}
319
320impl fmt::Debug for Id {
321    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
322        let hex_id = match self.id {
323            IdBytes::V1(id) => hex::encode(id),
324            IdBytes::V2(id) => hex::encode(id),
325        };
326        f.write_str(&format!("{}{}", self.version, hex_id))
327    }
328}
329
330impl TryFrom<String> for Id {
331    type Error = Error;
332
333    fn try_from(s: String) -> Result<Self, Self::Error> {
334        // Check that string is ASCII (required for hex) to avoid panics on byte slicing
335        // with multi-byte UTF-8 characters
336        ensure_cdk!(
337            s.is_ascii(),
338            Error::HexError(hex::Error::InvalidHexCharacter {
339                c: s.chars().find(|c| !c.is_ascii()).unwrap_or('\0'),
340                index: s.chars().position(|c| !c.is_ascii()).unwrap_or(0),
341            })
342        );
343
344        ensure_cdk!(
345            s.len() == Self::STRLEN_V1 + 2 || s.len() == Self::STRLEN_V2 + 2,
346            Error::Length
347        );
348
349        let version: KeySetVersion = KeySetVersion::from_byte(&hex::decode(&s[..2])?[0])?;
350        let id = match version {
351            KeySetVersion::Version00 => IdBytes::V1(
352                hex::decode(&s[2..])?
353                    .try_into()
354                    .map_err(|_| Error::Length)?,
355            ),
356            KeySetVersion::Version01 => IdBytes::V2(
357                hex::decode(&s[2..])?
358                    .try_into()
359                    .map_err(|_| Error::Length)?,
360            ),
361        };
362
363        Ok(Self { version, id })
364    }
365}
366
367impl FromStr for Id {
368    type Err = Error;
369
370    fn from_str(s: &str) -> Result<Self, Self::Err> {
371        Self::try_from(s.to_string())
372    }
373}
374
375impl From<Id> for String {
376    fn from(value: Id) -> Self {
377        value.to_string()
378    }
379}
380
381/// Improper prefix of the keyset ID. In case of v1, this is the whole ID.
382/// In case of v2, this is the 8-byte prefix
383#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
384#[serde(into = "String", try_from = "String")]
385pub struct ShortKeysetId {
386    /// The version of the short keyset
387    version: KeySetVersion,
388    /// The improper prefix of the keyset ID bytes
389    prefix: Vec<u8>,
390}
391
392impl ShortKeysetId {
393    /// [`ShortKeysetId`] to bytes
394    pub fn to_bytes(&self) -> Vec<u8> {
395        [vec![self.version.to_byte()], self.prefix.clone()].concat()
396    }
397
398    /// [`ShortKeysetId`] from bytes
399    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
400        if bytes.is_empty() {
401            return Err(Error::Length);
402        }
403
404        let version = KeySetVersion::from_byte(&bytes[0])?;
405        let prefix = bytes[1..].to_vec();
406        Ok(Self { version, prefix })
407    }
408}
409
410impl From<Id> for ShortKeysetId {
411    fn from(id: Id) -> Self {
412        let version = id.version;
413        let prefix: Vec<u8> = match id.version {
414            KeySetVersion::Version00 => match id.id {
415                IdBytes::V1(idbytes) => Vec::from(&idbytes),
416                _ => panic!("Unexpected IdBytes length"),
417            },
418            KeySetVersion::Version01 => match id.id {
419                IdBytes::V2(idbytes) => Vec::from(&idbytes[..7]),
420                _ => panic!("Unexpected IdBytes length"),
421            },
422        };
423
424        Self { version, prefix }
425    }
426}
427
428impl fmt::Display for ShortKeysetId {
429    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
430        let hex_id = hex::encode(&self.prefix);
431        f.write_str(&format!("{}{}", self.version, hex_id))
432    }
433}
434
435impl fmt::Debug for ShortKeysetId {
436    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
437        let hex_id = hex::encode(&self.prefix);
438        f.write_str(&format!("{}{}", self.version, hex_id))
439    }
440}
441
442impl TryFrom<String> for ShortKeysetId {
443    type Error = Error;
444
445    fn try_from(s: String) -> Result<Self, Self::Error> {
446        // Check that string is ASCII (required for hex) to avoid panics on byte slicing
447        // with multi-byte UTF-8 characters
448        ensure_cdk!(
449            s.is_ascii(),
450            Error::HexError(hex::Error::InvalidHexCharacter {
451                c: s.chars().find(|c| !c.is_ascii()).unwrap_or('\0'),
452                index: s.chars().position(|c| !c.is_ascii()).unwrap_or(0),
453            })
454        );
455
456        let bytes = hex::decode(s)?;
457
458        Self::from_bytes(&bytes)
459    }
460}
461
462impl FromStr for ShortKeysetId {
463    type Err = Error;
464
465    fn from_str(s: &str) -> Result<Self, Self::Err> {
466        Self::try_from(s.to_string())
467    }
468}
469
470impl From<ShortKeysetId> for String {
471    fn from(value: ShortKeysetId) -> Self {
472        value.to_string()
473    }
474}
475
476/// Mint Keysets [NUT-02]
477/// Ids of mints keyset ids
478#[serde_as]
479#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
480pub struct KeysetResponse {
481    /// set of public key ids that the mint generates
482    #[serde_as(as = "VecSkipError<_>")]
483    pub keysets: Vec<KeySetInfo>,
484}
485
486/// Keyset
487#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
488pub struct KeySet {
489    /// Keyset [`Id`]
490    pub id: Id,
491    /// Keyset [`CurrencyUnit`]
492    pub unit: CurrencyUnit,
493    /// Keyset state - indicates whether the mint will sign new outputs with this keyset
494    #[serde(skip_serializing_if = "Option::is_none")]
495    pub active: Option<bool>,
496    /// Keyset [`Keys`]
497    pub keys: Keys,
498    /// Input Fee PPK
499    #[serde(default)]
500    pub input_fee_ppk: u64,
501    /// Expiry
502    #[serde(skip_serializing_if = "Option::is_none")]
503    pub final_expiry: Option<u64>,
504}
505
506impl KeySet {
507    /// Verify the keyset id matches keys
508    pub fn verify_id(&self) -> Result<(), Error> {
509        let keys_id = match self.id.version {
510            KeySetVersion::Version00 => Id::v1_from_keys(&self.keys),
511            KeySetVersion::Version01 => Id::v2_from_data(
512                &self.keys,
513                &self.unit,
514                self.input_fee_ppk,
515                self.final_expiry,
516            ),
517        };
518
519        ensure_cdk!(
520            u32::from(keys_id) == u32::from(self.id),
521            Error::IncorrectKeysetId
522        );
523
524        ensure_cdk!(keys_id == self.id, Error::IncorrectKeysetId);
525
526        Ok(())
527    }
528}
529
530/// KeySetInfo
531#[derive(Debug, Clone, Hash, PartialEq, Eq, Deserialize, Serialize)]
532pub struct KeySetInfo {
533    /// Keyset [`Id`]
534    pub id: Id,
535    /// Keyset [`CurrencyUnit`]
536    pub unit: CurrencyUnit,
537    /// Keyset state
538    /// Mint will only sign from an active keyset
539    pub active: bool,
540    /// Input Fee PPK
541    #[serde(
542        deserialize_with = "deserialize_input_fee_ppk",
543        default = "default_input_fee_ppk"
544    )]
545    pub input_fee_ppk: u64,
546    /// Expiry of the keyset
547    #[serde(skip_serializing_if = "Option::is_none")]
548    pub final_expiry: Option<u64>,
549}
550
551/// List of [KeySetInfo]
552pub type KeySetInfos = Vec<KeySetInfo>;
553
554/// Utility methods for [KeySetInfos]
555pub trait KeySetInfosMethods {
556    /// Filter for active keysets
557    fn active(&self) -> impl Iterator<Item = &KeySetInfo> + '_;
558
559    /// Filter keysets for specific unit
560    fn unit(&self, unit: CurrencyUnit) -> impl Iterator<Item = &KeySetInfo> + '_;
561}
562
563impl KeySetInfosMethods for KeySetInfos {
564    fn active(&self) -> impl Iterator<Item = &KeySetInfo> + '_ {
565        self.iter().filter(|k| k.active)
566    }
567
568    fn unit(&self, unit: CurrencyUnit) -> impl Iterator<Item = &KeySetInfo> + '_ {
569        self.iter().filter(move |k| k.unit == unit)
570    }
571}
572
573fn deserialize_input_fee_ppk<'de, D>(deserializer: D) -> Result<u64, D::Error>
574where
575    D: Deserializer<'de>,
576{
577    // This will either give us a u64 or null (which becomes None)
578    let opt = Option::<u64>::deserialize(deserializer)?;
579    Ok(opt.unwrap_or_else(default_input_fee_ppk))
580}
581
582fn default_input_fee_ppk() -> u64 {
583    0
584}
585
586#[cfg(feature = "mint")]
587/// MintKeyset
588#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
589pub struct MintKeySet {
590    /// Keyset [`Id`]
591    pub id: Id,
592    /// Keyset [`CurrencyUnit`]
593    pub unit: CurrencyUnit,
594    /// Keyset [`MintKeys`]
595    pub keys: MintKeys,
596    /// Input Fee PPK
597    #[serde(default)]
598    pub input_fee_ppk: u64,
599    #[serde(skip_serializing_if = "Option::is_none")]
600    /// Expiry [`Option<u64>`]
601    pub final_expiry: Option<u64>,
602}
603
604#[cfg(feature = "mint")]
605impl MintKeySet {
606    /// Generate new [`MintKeySet`]
607    ///
608    /// # Panics
609    ///
610    /// This function will panic if the RNG fails or if key derivation fails,
611    /// which should not happen under normal circumstances.
612    pub fn generate<C: secp256k1::Signing>(
613        secp: &Secp256k1<C>,
614        xpriv: Xpriv,
615        unit: CurrencyUnit,
616        amounts: &[u64],
617        input_fee_ppk: u64,
618        final_expiry: Option<u64>,
619        version: KeySetVersion,
620    ) -> Self {
621        let mut map = BTreeMap::new();
622        for (i, amount) in amounts.iter().enumerate() {
623            let secret_key = xpriv
624                .derive_priv(
625                    secp,
626                    &[ChildNumber::from_hardened_idx(i as u32).expect("order is valid index")],
627                )
628                .expect("RNG busted")
629                .private_key;
630            let public_key = secret_key.public_key(secp);
631            map.insert(
632                amount.into(),
633                MintKeyPair {
634                    secret_key: secret_key.into(),
635                    public_key: public_key.into(),
636                },
637            );
638        }
639
640        let keys = MintKeys::new(map);
641        let id = match version {
642            KeySetVersion::Version00 => Id::v1_from_keys(&keys.clone().into()),
643            KeySetVersion::Version01 => {
644                Id::v2_from_data(&keys.clone().into(), &unit, input_fee_ppk, final_expiry)
645            }
646        };
647        Self {
648            id,
649            unit,
650            keys,
651            input_fee_ppk,
652            final_expiry,
653        }
654    }
655
656    /// Generate new [`MintKeySet`] from seed
657    ///
658    /// # Panics
659    ///
660    /// This function will panic if the RNG fails or if key derivation fails,
661    /// which should not happen under normal circumstances.
662    #[allow(clippy::too_many_arguments)]
663    pub fn generate_from_seed<C: secp256k1::Signing>(
664        secp: &Secp256k1<C>,
665        seed: &[u8],
666        amounts: &[u64],
667        currency_unit: CurrencyUnit,
668        derivation_path: DerivationPath,
669        input_fee_ppk: u64,
670        final_expiry: Option<u64>,
671        version: KeySetVersion,
672    ) -> Self {
673        let xpriv = Xpriv::new_master(bitcoin::Network::Bitcoin, seed).expect("RNG busted");
674        Self::generate(
675            secp,
676            xpriv
677                .derive_priv(secp, &derivation_path)
678                .expect("RNG busted"),
679            currency_unit,
680            amounts,
681            input_fee_ppk,
682            final_expiry,
683            version,
684        )
685    }
686
687    /// Generate new [`MintKeySet`] from xpriv
688    ///
689    /// # Panics
690    ///
691    /// This function will panic if the RNG fails or if key derivation fails,
692    /// which should not happen under normal circumstances.
693    #[allow(clippy::too_many_arguments)]
694    pub fn generate_from_xpriv<C: secp256k1::Signing>(
695        secp: &Secp256k1<C>,
696        xpriv: Xpriv,
697        amounts: &[u64],
698        currency_unit: CurrencyUnit,
699        derivation_path: DerivationPath,
700        input_fee_ppk: u64,
701        final_expiry: Option<u64>,
702        version: KeySetVersion,
703    ) -> Self {
704        Self::generate(
705            secp,
706            xpriv
707                .derive_priv(secp, &derivation_path)
708                .expect("RNG busted"),
709            currency_unit,
710            amounts,
711            input_fee_ppk,
712            final_expiry,
713            version,
714        )
715    }
716}
717
718#[cfg(feature = "mint")]
719impl From<MintKeySet> for Id {
720    fn from(keyset: MintKeySet) -> Id {
721        let keys: Keys = keyset.keys.into();
722        match keyset.id.version {
723            KeySetVersion::Version00 => Id::v1_from_keys(&keys),
724            KeySetVersion::Version01 => Id::v2_from_data(
725                &keys,
726                &keyset.unit,
727                keyset.input_fee_ppk,
728                keyset.final_expiry,
729            ),
730        }
731    }
732}
733
734#[cfg(feature = "mint")]
735impl From<&MintKeys> for Id {
736    fn from(map: &MintKeys) -> Self {
737        let keys: super::Keys = map.clone().into();
738
739        Id::v1_from_keys(&keys)
740    }
741}
742
743#[cfg(test)]
744mod test {
745    use std::str::FromStr;
746
747    use bitcoin::secp256k1::rand::{self, RngCore};
748
749    use super::{KeySetInfo, KeySetVersion, Keys, KeysetResponse, ShortKeysetId};
750    use crate::nuts::nut02::{Error, Id};
751    use crate::nuts::KeysResponse;
752    use crate::util::hex;
753    use crate::CurrencyUnit;
754
755    const SHORT_KEYSET_ID: &str = "00456a94ab4e1c46";
756    const SHORT_KEYSET: &str = r#"
757        {
758            "1":"03a40f20667ed53513075dc51e715ff2046cad64eb68960632269ba7f0210e38bc",
759            "2":"03fd4ce5a16b65576145949e6f99f445f8249fee17c606b688b504a849cdc452de",
760            "4":"02648eccfa4c026960966276fa5a4cae46ce0fd432211a4f449bf84f13aa5f8303",
761            "8":"02fdfd6796bfeac490cbee12f778f867f0a2c68f6508d17c649759ea0dc3547528"
762        }
763    "#;
764
765    const KEYSET_ID: &str = "000f01df73ea149a";
766    const KEYSET: &str = r#"
767        {
768            "1":"03ba786a2c0745f8c30e490288acd7a72dd53d65afd292ddefa326a4a3fa14c566",
769            "2":"03361cd8bd1329fea797a6add1cf1990ffcf2270ceb9fc81eeee0e8e9c1bd0cdf5",
770            "4":"036e378bcf78738ddf68859293c69778035740e41138ab183c94f8fee7572214c7",
771            "8":"03909d73beaf28edfb283dbeb8da321afd40651e8902fcf5454ecc7d69788626c0",
772            "16":"028a36f0e6638ea7466665fe174d958212723019ec08f9ce6898d897f88e68aa5d",
773            "32":"03a97a40e146adee2687ac60c2ba2586a90f970de92a9d0e6cae5a4b9965f54612",
774            "64":"03ce86f0c197aab181ddba0cfc5c5576e11dfd5164d9f3d4a3fc3ffbbf2e069664",
775            "128":"0284f2c06d938a6f78794814c687560a0aabab19fe5e6f30ede38e113b132a3cb9",
776            "256":"03b99f475b68e5b4c0ba809cdecaae64eade2d9787aa123206f91cd61f76c01459",
777            "512":"03d4db82ea19a44d35274de51f78af0a710925fe7d9e03620b84e3e9976e3ac2eb",
778            "1024":"031fbd4ba801870871d46cf62228a1b748905ebc07d3b210daf48de229e683f2dc",
779            "2048":"0276cedb9a3b160db6a158ad4e468d2437f021293204b3cd4bf6247970d8aff54b",
780            "4096":"02fc6b89b403ee9eb8a7ed457cd3973638080d6e04ca8af7307c965c166b555ea2",
781            "8192":"0320265583e916d3a305f0d2687fcf2cd4e3cd03a16ea8261fda309c3ec5721e21",
782            "16384":"036e41de58fdff3cb1d8d713f48c63bc61fa3b3e1631495a444d178363c0d2ed50",
783            "32768":"0365438f613f19696264300b069d1dad93f0c60a37536b72a8ab7c7366a5ee6c04",
784            "65536":"02408426cfb6fc86341bac79624ba8708a4376b2d92debdf4134813f866eb57a8d",
785            "131072":"031063e9f11c94dc778c473e968966eac0e70b7145213fbaff5f7a007e71c65f41",
786            "262144":"02f2a3e808f9cd168ec71b7f328258d0c1dda250659c1aced14c7f5cf05aab4328",
787            "524288":"038ac10de9f1ff9395903bb73077e94dbf91e9ef98fd77d9a2debc5f74c575bc86",
788            "1048576":"0203eaee4db749b0fc7c49870d082024b2c31d889f9bc3b32473d4f1dfa3625788",
789            "2097152":"033cdb9d36e1e82ae652b7b6a08e0204569ec7ff9ebf85d80a02786dc7fe00b04c",
790            "4194304":"02c8b73f4e3a470ae05e5f2fe39984d41e9f6ae7be9f3b09c9ac31292e403ac512",
791            "8388608":"025bbe0cfce8a1f4fbd7f3a0d4a09cb6badd73ef61829dc827aa8a98c270bc25b0",
792            "16777216":"037eec3d1651a30a90182d9287a5c51386fe35d4a96839cf7969c6e2a03db1fc21",
793            "33554432":"03280576b81a04e6abd7197f305506476f5751356b7643988495ca5c3e14e5c262",
794            "67108864":"03268bfb05be1dbb33ab6e7e00e438373ca2c9b9abc018fdb452d0e1a0935e10d3",
795            "134217728":"02573b68784ceba9617bbcc7c9487836d296aa7c628c3199173a841e7a19798020",
796            "268435456":"0234076b6e70f7fbf755d2227ecc8d8169d662518ee3a1401f729e2a12ccb2b276",
797            "536870912":"03015bd88961e2a466a2163bd4248d1d2b42c7c58a157e594785e7eb34d880efc9",
798            "1073741824":"02c9b076d08f9020ebee49ac8ba2610b404d4e553a4f800150ceb539e9421aaeee",
799            "2147483648":"034d592f4c366afddc919a509600af81b489a03caf4f7517c2b3f4f2b558f9a41a",
800            "4294967296":"037c09ecb66da082981e4cbdb1ac65c0eb631fc75d85bed13efb2c6364148879b5",
801            "8589934592":"02b4ebb0dda3b9ad83b39e2e31024b777cc0ac205a96b9a6cfab3edea2912ed1b3",
802            "17179869184":"026cc4dacdced45e63f6e4f62edbc5779ccd802e7fabb82d5123db879b636176e9",
803            "34359738368":"02b2cee01b7d8e90180254459b8f09bbea9aad34c3a2fd98c85517ecfc9805af75",
804            "68719476736":"037a0c0d564540fc574b8bfa0253cca987b75466e44b295ed59f6f8bd41aace754",
805            "137438953472":"021df6585cae9b9ca431318a713fd73dbb76b3ef5667957e8633bca8aaa7214fb6",
806            "274877906944":"02b8f53dde126f8c85fa5bb6061c0be5aca90984ce9b902966941caf963648d53a",
807            "549755813888":"029cc8af2840d59f1d8761779b2496623c82c64be8e15f9ab577c657c6dd453785",
808            "1099511627776":"03e446fdb84fad492ff3a25fc1046fb9a93a5b262ebcd0151caa442ea28959a38a",
809            "2199023255552":"02d6b25bd4ab599dd0818c55f75702fde603c93f259222001246569018842d3258",
810            "4398046511104":"03397b522bb4e156ec3952d3f048e5a986c20a00718e5e52cd5718466bf494156a",
811            "8796093022208":"02d1fb9e78262b5d7d74028073075b80bb5ab281edcfc3191061962c1346340f1e",
812            "17592186044416":"030d3f2ad7a4ca115712ff7f140434f802b19a4c9b2dd1c76f3e8e80c05c6a9310",
813            "35184372088832":"03e325b691f292e1dfb151c3fb7cad440b225795583c32e24e10635a80e4221c06",
814            "70368744177664":"03bee8f64d88de3dee21d61f89efa32933da51152ddbd67466bef815e9f93f8fd1",
815            "140737488355328":"0327244c9019a4892e1f04ba3bf95fe43b327479e2d57c25979446cc508cd379ed",
816            "281474976710656":"02fb58522cd662f2f8b042f8161caae6e45de98283f74d4e99f19b0ea85e08a56d",
817            "562949953421312":"02adde4b466a9d7e59386b6a701a39717c53f30c4810613c1b55e6b6da43b7bc9a",
818            "1125899906842624":"038eeda11f78ce05c774f30e393cda075192b890d68590813ff46362548528dca9",
819            "2251799813685248":"02ec13e0058b196db80f7079d329333b330dc30c000dbdd7397cbbc5a37a664c4f",
820            "4503599627370496":"02d2d162db63675bd04f7d56df04508840f41e2ad87312a3c93041b494efe80a73",
821            "9007199254740992":"0356969d6aef2bb40121dbd07c68b6102339f4ea8e674a9008bb69506795998f49",
822            "18014398509481984":"02f4e667567ebb9f4e6e180a4113bb071c48855f657766bb5e9c776a880335d1d6",
823            "36028797018963968":"0385b4fe35e41703d7a657d957c67bb536629de57b7e6ee6fe2130728ef0fc90b0",
824            "72057594037927936":"02b2bc1968a6fddbcc78fb9903940524824b5f5bed329c6ad48a19b56068c144fd",
825            "144115188075855872":"02e0dbb24f1d288a693e8a49bc14264d1276be16972131520cf9e055ae92fba19a",
826            "288230376151711744":"03efe75c106f931a525dc2d653ebedddc413a2c7d8cb9da410893ae7d2fa7d19cc",
827            "576460752303423488":"02c7ec2bd9508a7fc03f73c7565dc600b30fd86f3d305f8f139c45c404a52d958a",
828            "1152921504606846976":"035a6679c6b25e68ff4e29d1c7ef87f21e0a8fc574f6a08c1aa45ff352c1d59f06",
829            "2305843009213693952":"033cdc225962c052d485f7cfbf55a5b2367d200fe1fe4373a347deb4cc99e9a099",
830            "4611686018427387904":"024a4b806cf413d14b294719090a9da36ba75209c7657135ad09bc65328fba9e6f",
831            "9223372036854775808":"0377a6fe114e291a8d8e991627c38001c8305b23b9e98b1c7b1893f5cd0dda6cad"
832        }
833    "#;
834
835    #[test]
836    fn test_deserialization_and_id_generation() {
837        let _id = Id::from_str("009a1f293253e41e").unwrap();
838
839        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();
840
841        let id: Id = Id::v1_from_keys(&keys);
842
843        assert_eq!(id, Id::from_str(SHORT_KEYSET_ID).unwrap());
844
845        let keys: Keys = serde_json::from_str(KEYSET).unwrap();
846
847        let id: Id = Id::v1_from_keys(&keys);
848
849        assert_eq!(id, Id::from_str(KEYSET_ID).unwrap());
850    }
851
852    #[test]
853    fn test_v2_deserialization_and_id_generation() {
854        let unit: CurrencyUnit = CurrencyUnit::from_str("sat").unwrap();
855        let expiry: u64 = 2059210353; // +10 years from now
856        let input_fee_ppk = 100;
857
858        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();
859        let id_from_str =
860            Id::from_str("015ba18a8adcd02e715a58358eb618da4a4b3791151a4bee5e968bb88406ccf76a")
861                .unwrap();
862        let id = Id::v2_from_data(&keys, &unit, input_fee_ppk, Some(expiry));
863        assert_eq!(id, id_from_str);
864
865        let keys: Keys = serde_json::from_str(KEYSET).unwrap();
866        let id_from_str =
867            Id::from_str("01ab6aa4ff30390da34986d84be5274b48ad7a74265d791095bfc39f4098d9764f")
868                .unwrap();
869        let id = Id::v2_from_data(&keys, &unit, 0, Some(expiry));
870        assert_eq!(id, id_from_str);
871
872        let id = Id::v2_from_data(&keys, &unit, 0, None);
873        let id_from_str =
874            Id::from_str("012fbb01a4e200c76df911eeba3b8fe1831202914b24664f4bccbd25852a6708f8")
875                .unwrap();
876        assert_eq!(id, id_from_str);
877    }
878
879    #[test]
880    fn test_deserialization_keyset_info() {
881        let h = r#"{"id":"009a1f293253e41e","unit":"sat","active":true}"#;
882
883        let _keyset_response: KeySetInfo = serde_json::from_str(h).unwrap();
884
885        let h = r#"{"id":"009a1f293253e41e","unit":"sat","active":true, "input_fee_ppk":null}"#;
886
887        let _keyset_response: KeySetInfo = serde_json::from_str(h).unwrap();
888    }
889
890    #[test]
891    fn test_deserialization_of_keyset_response() {
892        let h = r#"{"keysets":[{"id":"009a1f293253e41e","unit":"sat","active":true, "input_fee_ppk": 100},{"id":"eGnEWtdJ0PIM","unit":"sat","active":true},{"id":"003dfdf4e5e35487","unit":"sat","active":true},{"id":"0066ad1a4b6fc57c","unit":"sat","active":true},{"id":"00f7ca24d44c3e5e","unit":"sat","active":true},{"id":"001fcea2931f2d85","unit":"sat","active":true},{"id":"00d095959d940edb","unit":"sat","active":true},{"id":"000d7f730d657125","unit":"sat","active":true},{"id":"0007208d861d7295","unit":"sat","active":true},{"id":"00bfdf8889b719dd","unit":"sat","active":true},{"id":"00ca9b17da045f21","unit":"sat","active":true}]}"#;
893
894        let _keyset_response: KeysetResponse = serde_json::from_str(h).unwrap();
895    }
896
897    #[test]
898    fn test_to_int() {
899        let id = Id::from_str("009a1f293253e41e").unwrap();
900
901        let id_int = u32::from(id);
902        assert_eq!(864559728, id_int)
903    }
904
905    #[test]
906    fn test_v2_to_int() {
907        let id = Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
908            .unwrap();
909
910        let id_int = u32::from(id);
911        assert_eq!(2113471806, id_int);
912    }
913
914    #[test]
915    fn test_id_from_invalid_byte_length() {
916        let three_bytes = [0x01, 0x02, 0x03];
917        let result = Id::from_bytes(&three_bytes);
918        assert!(result.is_err(), "Expected an invalid byte length error");
919    }
920
921    #[test]
922    fn test_id_from_empty_bytes() {
923        let result = Id::from_bytes(&[]);
924        assert!(
925            matches!(result, Err(Error::Length)),
926            "Expected an Error::Length error but got {:?}",
927            result
928        );
929    }
930
931    #[test]
932    fn test_keyset_bytes() {
933        let id = Id::from_str("009a1f293253e41e").unwrap();
934
935        let id_bytes = id.to_bytes();
936
937        assert_eq!(id_bytes.len(), 8);
938
939        let id_from_bytes = Id::from_bytes(&id_bytes).unwrap();
940
941        assert_eq!(id_from_bytes, id);
942    }
943
944    #[test]
945    fn test_keyset_version_proto_mapping() {
946        assert_eq!(
947            KeySetVersion::from_proto_i32(1).unwrap(),
948            KeySetVersion::Version00
949        );
950        assert_eq!(
951            KeySetVersion::from_proto_i32(2).unwrap(),
952            KeySetVersion::Version01
953        );
954        assert!(matches!(
955            KeySetVersion::from_proto_i32(0),
956            Err(Error::UnknownVersion)
957        ));
958
959        assert_eq!(KeySetVersion::Version00.to_proto_i32(), 1);
960        assert_eq!(KeySetVersion::Version01.to_proto_i32(), 2);
961    }
962
963    #[test]
964    fn test_deserialization_keys_response() {
965        let keys = 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966
967        let keys_response: KeysResponse = serde_json::from_str(keys).unwrap();
968
969        assert_eq!(keys_response.keysets.len(), 2);
970    }
971
972    fn generate_random_id(version: KeySetVersion) -> Id {
973        match version {
974            KeySetVersion::Version00 => {
975                let mut rand_bytes = vec![0u8; 8];
976                rand::thread_rng().fill_bytes(&mut rand_bytes[1..]);
977                Id::from_bytes(&rand_bytes).unwrap_or_else(|e| {
978                    panic!("Failed to create Id from {}: {e}", hex::encode(rand_bytes))
979                })
980            }
981            KeySetVersion::Version01 => {
982                let mut rand_bytes = vec![1u8; 33];
983                rand::thread_rng().fill_bytes(&mut rand_bytes[1..]);
984                Id::from_bytes(&rand_bytes).unwrap_or_else(|e| {
985                    panic!("Failed to create Id from {}: {e}", hex::encode(rand_bytes))
986                })
987            }
988        }
989    }
990
991    #[test]
992    fn test_id_serialization() {
993        let id = generate_random_id(KeySetVersion::Version00);
994        let id_str = id.to_string();
995
996        assert!(id_str.chars().all(|c| c.is_ascii_hexdigit()));
997        assert_eq!(16, id_str.len());
998        assert_eq!(id_str.to_lowercase(), id_str);
999    }
1000
1001    #[test]
1002    fn test_id_v2_serialization() {
1003        let id = generate_random_id(KeySetVersion::Version01);
1004        let id_str = id.to_string();
1005
1006        assert!(id_str.chars().all(|c| c.is_ascii_hexdigit()));
1007        assert_eq!(66, id_str.len());
1008        assert_eq!(id_str.to_lowercase(), id_str);
1009    }
1010
1011    #[test]
1012    fn test_id_deserialization() {
1013        let id_from_short_str = Id::from_str("00123");
1014        assert!(matches!(id_from_short_str, Err(Error::Length)));
1015
1016        let id_from_non_hex_str = Id::from_str(&SHORT_KEYSET_ID.replace('a', "x"));
1017        assert!(matches!(id_from_non_hex_str, Err(Error::HexError(_))));
1018
1019        let id_invalid_version = Id::from_str(&SHORT_KEYSET_ID.replace("00", "99"));
1020        assert!(matches!(id_invalid_version, Err(Error::UnknownVersion)));
1021
1022        let id_from_uppercase = Id::from_str(&SHORT_KEYSET_ID.to_uppercase());
1023        assert!(id_from_uppercase.is_ok());
1024    }
1025
1026    #[test]
1027    fn test_short_keyset_id_from_id() {
1028        let idv1 = Id::from_str("009a1f293253e41e").unwrap();
1029        let idv2 =
1030            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
1031                .unwrap();
1032
1033        let short_id_1: ShortKeysetId = idv1.into();
1034        let short_id_2: ShortKeysetId = idv2.into();
1035
1036        assert!(short_id_1.to_string() == "009a1f293253e41e");
1037        assert!(short_id_2.to_string() == "01adc013fa9d8517");
1038    }
1039
1040    #[test]
1041    fn test_id_with_non_ascii_chars() {
1042        // Test that non-ASCII characters in ID strings don't cause panics
1043        // but instead return proper errors. This was found by fuzzing.
1044        // The character 'ǝ' is a 2-byte UTF-8 sequence that could cause
1045        // panics when slicing by byte index.
1046        let id_with_non_ascii = Id::from_str("0ǝfa73302d12ff{");
1047        assert!(matches!(id_with_non_ascii, Err(Error::HexError(_))));
1048
1049        // Also test ShortKeysetId
1050        let short_id_with_non_ascii = ShortKeysetId::from_str("0ǝfa73302d12ff");
1051        assert!(matches!(short_id_with_non_ascii, Err(Error::HexError(_))));
1052    }
1053
1054    #[test]
1055    fn test_v2_from_data_expiry_zero_is_same_as_none() {
1056        let unit: CurrencyUnit = CurrencyUnit::from_str("sat").unwrap();
1057        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();
1058
1059        let id_with_none = Id::v2_from_data(&keys, &unit, 0, None);
1060        let id_with_zero = Id::v2_from_data(&keys, &unit, 0, Some(0));
1061        assert_eq!(
1062            id_with_none, id_with_zero,
1063            "expiry=Some(0) should be treated the same as expiry=None"
1064        );
1065    }
1066
1067    #[test]
1068    fn test_v2_from_data_input_fee_zero_is_same_as_no_fee_component() {
1069        let unit: CurrencyUnit = CurrencyUnit::from_str("sat").unwrap();
1070        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();
1071
1072        let id_without_fee = Id::v2_from_data(&keys, &unit, 0, Some(2059210353));
1073        let id_with_same_inputs = Id::v2_from_data(&keys, &unit, 0, Some(2059210353));
1074
1075        assert_eq!(id_without_fee, id_with_same_inputs);
1076    }
1077
1078    #[test]
1079    fn test_from_short_keyset_id_prefix_too_short() {
1080        let v1_info = KeySetInfo {
1081            id: Id::from_str("00009a1f293253e4").unwrap(),
1082            unit: CurrencyUnit::Sat,
1083            active: true,
1084            input_fee_ppk: 0,
1085            final_expiry: None,
1086        };
1087        let keysets = vec![v1_info];
1088
1089        let short_id = ShortKeysetId::from_bytes(&[0x00, 0x01, 0x02, 0x03]).unwrap();
1090        let res = Id::from_short_keyset_id(&short_id, &keysets);
1091        assert!(
1092            matches!(res, Err(Error::MalformedShortKeysetId)),
1093            "Expected MalformedShortKeysetId for prefix < 7 bytes, got {:?}",
1094            res
1095        );
1096    }
1097
1098    #[test]
1099    fn test_from_short_keyset_id_prefix_too_long() {
1100        let v2_id =
1101            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
1102                .unwrap();
1103        let v2_info = KeySetInfo {
1104            id: v2_id,
1105            unit: CurrencyUnit::Sat,
1106            active: true,
1107            input_fee_ppk: 0,
1108            final_expiry: None,
1109        };
1110        let keysets = vec![v2_info];
1111
1112        let mut bytes = vec![0x01u8];
1113        bytes.extend_from_slice(&[0xAA; 33]);
1114        let short_id = ShortKeysetId::from_bytes(&bytes).unwrap();
1115        let res = Id::from_short_keyset_id(&short_id, &keysets);
1116        assert!(
1117            matches!(res, Err(Error::MalformedShortKeysetId)),
1118            "Expected MalformedShortKeysetId for prefix > 32 bytes, got {:?}",
1119            res
1120        );
1121    }
1122
1123    #[test]
1124    fn test_from_short_keyset_id_panic_regression() {
1125        // v1 id - 7 bytes + 1 byte version prefix = 16 hex chars
1126        let v1_id = Id::from_str("00009a1f293253e4").unwrap();
1127        let v1_info = KeySetInfo {
1128            id: v1_id,
1129            unit: CurrencyUnit::Sat,
1130            active: true,
1131            input_fee_ppk: 0,
1132            final_expiry: None,
1133        };
1134
1135        // v2 id - 32 bytes
1136        let v2_id =
1137            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
1138                .unwrap();
1139        let v2_info = KeySetInfo {
1140            id: v2_id,
1141            unit: CurrencyUnit::Sat,
1142            active: true,
1143            input_fee_ppk: 0,
1144            final_expiry: None,
1145        };
1146
1147        let keysets = vec![v1_info, v2_info];
1148
1149        // This is a v2 short id with 8 bytes prefix
1150        // Before the fix, this would panic when checking against v1_info
1151        let short_id = ShortKeysetId::from_str("01000000003b00000e").unwrap();
1152
1153        let res = Id::from_short_keyset_id(&short_id, &keysets);
1154        assert!(res.is_err());
1155    }
1156
1157    #[test]
1158    fn test_from_short_keyset_id_accepts_boundary_prefix_lengths() {
1159        let v1_id = Id::from_str("00009a1f293253e4").unwrap();
1160        let v2_id =
1161            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
1162                .unwrap();
1163
1164        let keysets = vec![
1165            KeySetInfo {
1166                id: v1_id,
1167                unit: CurrencyUnit::Sat,
1168                active: true,
1169                input_fee_ppk: 0,
1170                final_expiry: None,
1171            },
1172            KeySetInfo {
1173                id: v2_id,
1174                unit: CurrencyUnit::Sat,
1175                active: true,
1176                input_fee_ppk: 0,
1177                final_expiry: None,
1178            },
1179        ];
1180
1181        let short_v1 = ShortKeysetId::from_bytes(&v1_id.to_bytes()).unwrap();
1182        let short_v2 = ShortKeysetId::from(v2_id);
1183
1184        assert_eq!(
1185            Id::from_short_keyset_id(&short_v1, &keysets).unwrap(),
1186            v1_id
1187        );
1188        assert_eq!(
1189            Id::from_short_keyset_id(&short_v2, &keysets).unwrap(),
1190            v2_id
1191        );
1192    }
1193
1194    #[test]
1195    fn test_from_short_keyset_id_returns_unknown_when_v2_prefix_does_not_match() {
1196        let v2_id =
1197            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
1198                .unwrap();
1199        let keysets = vec![KeySetInfo {
1200            id: v2_id,
1201            unit: CurrencyUnit::Sat,
1202            active: true,
1203            input_fee_ppk: 0,
1204            final_expiry: None,
1205        }];
1206
1207        let short_id = ShortKeysetId::from_str("01ffffffffffffff").unwrap();
1208        let res = Id::from_short_keyset_id(&short_id, &keysets);
1209
1210        assert!(matches!(res, Err(Error::UnknownShortKeysetId)));
1211    }
1212
1213    #[test]
1214    fn test_from_short_keyset_id_accepts_exact_32_byte_v2_prefix() {
1215        // Boundary test: a short id whose prefix is exactly 32 bytes (BYTELEN_V2)
1216        // must be accepted and match the full v2 id (which is itself 32 bytes).
1217        let v2_id =
1218            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
1219                .unwrap();
1220        let keysets = vec![KeySetInfo {
1221            id: v2_id,
1222            unit: CurrencyUnit::Sat,
1223            active: true,
1224            input_fee_ppk: 0,
1225            final_expiry: None,
1226        }];
1227
1228        // Build a ShortKeysetId whose prefix equals the full 32-byte id.
1229        // The byte representation is: [version_byte, 32-byte id...], total 33 bytes.
1230        let short_id = ShortKeysetId::from_bytes(&v2_id.to_bytes()).unwrap();
1231        assert_eq!(short_id.prefix.len(), 32);
1232
1233        let res = Id::from_short_keyset_id(&short_id, &keysets).unwrap();
1234        assert_eq!(res, v2_id);
1235    }
1236
1237    #[test]
1238    fn test_id_debug_format_equals_display() {
1239        // Ensure Debug impl is not a no-op. Mutants that replace the body with
1240        // Ok(Default::default()) would produce an empty string.
1241        let id_v1 = Id::from_str(SHORT_KEYSET_ID).unwrap();
1242        assert_eq!(format!("{:?}", id_v1), id_v1.to_string());
1243        assert!(!format!("{:?}", id_v1).is_empty());
1244
1245        let id_v2 =
1246            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
1247                .unwrap();
1248        assert_eq!(format!("{:?}", id_v2), id_v2.to_string());
1249        assert!(!format!("{:?}", id_v2).is_empty());
1250    }
1251
1252    #[test]
1253    fn test_short_keyset_id_debug_format_equals_display() {
1254        // Mutants replacing the body with Ok(Default::default()) would produce "".
1255        let short_v1 = ShortKeysetId::from_str(SHORT_KEYSET_ID).unwrap();
1256        assert_eq!(format!("{:?}", short_v1), short_v1.to_string());
1257        assert!(!format!("{:?}", short_v1).is_empty());
1258
1259        let v2_id =
1260            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
1261                .unwrap();
1262        let short_v2: ShortKeysetId = v2_id.into();
1263        assert_eq!(format!("{:?}", short_v2), short_v2.to_string());
1264        assert!(!format!("{:?}", short_v2).is_empty());
1265    }
1266
1267    #[test]
1268    fn test_keyset_verify_id_valid_returns_ok() {
1269        use super::KeySet;
1270
1271        // v1 keyset
1272        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();
1273        let id = Id::v1_from_keys(&keys);
1274        let keyset = KeySet {
1275            id,
1276            unit: CurrencyUnit::Sat,
1277            active: Some(true),
1278            keys: keys.clone(),
1279            input_fee_ppk: 0,
1280            final_expiry: None,
1281        };
1282        assert!(keyset.verify_id().is_ok(), "valid v1 keyset should verify");
1283
1284        // v2 keyset
1285        let unit = CurrencyUnit::Sat;
1286        let input_fee_ppk = 100u64;
1287        let expiry = Some(2059210353u64);
1288        let id_v2 = Id::v2_from_data(&keys, &unit, input_fee_ppk, expiry);
1289        let keyset_v2 = KeySet {
1290            id: id_v2,
1291            unit,
1292            active: Some(true),
1293            keys,
1294            input_fee_ppk,
1295            final_expiry: expiry,
1296        };
1297        assert!(
1298            keyset_v2.verify_id().is_ok(),
1299            "valid v2 keyset should verify"
1300        );
1301    }
1302
1303    #[test]
1304    fn test_keyset_verify_id_mismatch_returns_error() {
1305        use super::KeySet;
1306
1307        // Use SHORT_KEYSET's keys but mislabel it with KEYSET_ID (from a different keyset).
1308        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();
1309        let wrong_id = Id::from_str(KEYSET_ID).unwrap();
1310
1311        let keyset = KeySet {
1312            id: wrong_id,
1313            unit: CurrencyUnit::Sat,
1314            active: Some(true),
1315            keys,
1316            input_fee_ppk: 0,
1317            final_expiry: None,
1318        };
1319
1320        let res = keyset.verify_id();
1321        assert!(
1322            matches!(res, Err(Error::IncorrectKeysetId)),
1323            "expected IncorrectKeysetId, got {:?}",
1324            res
1325        );
1326    }
1327
1328    #[test]
1329    fn test_keyset_infos_active_filter() {
1330        use super::KeySetInfosMethods;
1331
1332        let id_a = Id::from_str("009a1f293253e41e").unwrap();
1333        let id_b = Id::from_str("00456a94ab4e1c46").unwrap();
1334        let id_c = Id::from_str("000f01df73ea149a").unwrap();
1335
1336        let infos: Vec<KeySetInfo> = vec![
1337            KeySetInfo {
1338                id: id_a,
1339                unit: CurrencyUnit::Sat,
1340                active: true,
1341                input_fee_ppk: 0,
1342                final_expiry: None,
1343            },
1344            KeySetInfo {
1345                id: id_b,
1346                unit: CurrencyUnit::Sat,
1347                active: false,
1348                input_fee_ppk: 0,
1349                final_expiry: None,
1350            },
1351            KeySetInfo {
1352                id: id_c,
1353                unit: CurrencyUnit::Usd,
1354                active: true,
1355                input_fee_ppk: 0,
1356                final_expiry: None,
1357            },
1358        ];
1359
1360        let active_ids: Vec<Id> = infos.active().map(|k| k.id).collect();
1361        assert_eq!(active_ids.len(), 2, "expected two active keysets");
1362        assert!(active_ids.contains(&id_a));
1363        assert!(active_ids.contains(&id_c));
1364        assert!(!active_ids.contains(&id_b));
1365    }
1366
1367    #[test]
1368    fn test_keyset_infos_unit_filter() {
1369        use super::KeySetInfosMethods;
1370
1371        let id_a = Id::from_str("009a1f293253e41e").unwrap();
1372        let id_b = Id::from_str("00456a94ab4e1c46").unwrap();
1373        let id_c = Id::from_str("000f01df73ea149a").unwrap();
1374
1375        let infos: Vec<KeySetInfo> = vec![
1376            KeySetInfo {
1377                id: id_a,
1378                unit: CurrencyUnit::Sat,
1379                active: true,
1380                input_fee_ppk: 0,
1381                final_expiry: None,
1382            },
1383            KeySetInfo {
1384                id: id_b,
1385                unit: CurrencyUnit::Usd,
1386                active: true,
1387                input_fee_ppk: 0,
1388                final_expiry: None,
1389            },
1390            KeySetInfo {
1391                id: id_c,
1392                unit: CurrencyUnit::Sat,
1393                active: false,
1394                input_fee_ppk: 0,
1395                final_expiry: None,
1396            },
1397        ];
1398
1399        let sat_ids: Vec<Id> = infos.unit(CurrencyUnit::Sat).map(|k| k.id).collect();
1400        assert_eq!(sat_ids.len(), 2, "expected two Sat keysets");
1401        assert!(sat_ids.contains(&id_a));
1402        assert!(sat_ids.contains(&id_c));
1403        assert!(
1404            !sat_ids.contains(&id_b),
1405            "Usd keyset should not appear in Sat filter"
1406        );
1407
1408        // A unit that does not match any entry must return an empty iterator.
1409        let none_ids: Vec<Id> = infos.unit(CurrencyUnit::Eur).map(|k| k.id).collect();
1410        assert!(none_ids.is_empty());
1411    }
1412
1413    #[test]
1414    fn test_default_input_fee_ppk_is_zero() {
1415        // KeySetInfo missing the input_fee_ppk field must default to 0.
1416        let json = r#"{"id":"009a1f293253e41e","unit":"sat","active":true}"#;
1417        let info: KeySetInfo = serde_json::from_str(json).unwrap();
1418        assert_eq!(info.input_fee_ppk, 0);
1419
1420        // Explicit null should also default to 0 via the custom deserializer.
1421        let json_null =
1422            r#"{"id":"009a1f293253e41e","unit":"sat","active":true,"input_fee_ppk":null}"#;
1423        let info_null: KeySetInfo = serde_json::from_str(json_null).unwrap();
1424        assert_eq!(info_null.input_fee_ppk, 0);
1425    }
1426}
cashu/nuts/nut02.rs

cashu/nuts/
nut02.rs
