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)]
58#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
59pub enum KeySetVersion {
60    /// Version 00
61    Version00,
62    /// Version 01
63    Version01,
64}
65
66impl KeySetVersion {
67    /// [`KeySetVersion`] to byte
68    pub fn to_byte(&self) -> u8 {
69        match self {
70            Self::Version00 => 0,
71            Self::Version01 => 1,
72        }
73    }
74
75    /// [`KeySetVersion`] from byte
76    pub fn from_byte(byte: &u8) -> Result<Self, Error> {
77        match byte {
78            0 => Ok(Self::Version00),
79            1 => Ok(Self::Version01),
80            _ => Err(Error::UnknownVersion),
81        }
82    }
83}
84
85impl fmt::Display for KeySetVersion {
86    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
87        match self {
88            KeySetVersion::Version00 => f.write_str("00"),
89            KeySetVersion::Version01 => f.write_str("01"),
90        }
91    }
92}
93
94/// Keyset ID bytes
95#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
96#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
97pub enum IdBytes {
98    /// Bytes for v1
99    V1([u8; 7]),
100    /// Bytes for v2
101    V2([u8; 32]),
102}
103
104impl IdBytes {
105    /// Convert [`IdBytes`] to [`Vec<u8>`]
106    pub fn to_vec(&self) -> Vec<u8> {
107        match self {
108            IdBytes::V1(bytes) => bytes.to_vec(),
109            IdBytes::V2(bytes) => bytes.to_vec(),
110        }
111    }
112}
113
114/// A keyset ID is an identifier for a specific keyset. It can be derived by
115/// anyone who knows the set of public keys of a mint. The keyset ID **CAN**
116/// be stored in a Cashu token such that the token can be used to identify
117/// which mint or keyset it was generated from.
118#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
119#[serde(into = "String", try_from = "String")]
120#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
121pub struct Id {
122    version: KeySetVersion,
123    id: IdBytes,
124}
125
126impl Id {
127    const STRLEN_V1: usize = 14;
128    const BYTELEN_V1: usize = 7;
129    const STRLEN_V2: usize = 64;
130    const BYTELEN_V2: usize = 32;
131
132    /// [`Id`] to bytes
133    pub fn to_bytes(&self) -> Vec<u8> {
134        [vec![self.version.to_byte()], self.id.to_vec()].concat()
135    }
136
137    /// [`Id`] from bytes
138    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
139        let version = KeySetVersion::from_byte(&bytes[0])?;
140        let id = match version {
141            KeySetVersion::Version00 => IdBytes::V1(bytes[1..].try_into()?),
142            KeySetVersion::Version01 => IdBytes::V2(bytes[1..].try_into()?),
143        };
144        Ok(Self { version, id })
145    }
146
147    /// Get the version of the keyset
148    pub fn get_version(&self) -> KeySetVersion {
149        self.version
150    }
151
152    /// *** V2 KEYSET ***
153    /// create [`Id`] v2 from keys, unit and (optionally) expiry
154    /// 1 - sort public keys by their amount in ascending order
155    /// 2 - concatenate all public keys to one byte array
156    /// 3 - concatenate the lowercase unit string to the byte array (e.g. "unit:sat")
157    /// 4 - If a final expiration is specified, convert it into a radix-10 string and concatenate it (e.g "final_expiry:1896187313")
158    /// 5 - HASH_SHA256 the concatenated byte array and take the first 31 bytes
159    /// 6 - prefix it with a keyset ID version byte
160    ///
161    /// # Panics
162    ///
163    /// This function will not panic under normal circumstances as the hash output
164    /// is always valid hex and the correct length.
165    pub fn v2_from_data(
166        map: &Keys,
167        unit: &CurrencyUnit,
168        input_fee_ppk: u64,
169        expiry: Option<u64>,
170    ) -> Self {
171        let mut keys: Vec<(&Amount, &super::PublicKey)> = map.iter().collect();
172        keys.sort_by_key(|(amt, _v)| *amt);
173
174        let keys_string = keys
175            .iter()
176            .map(|(amt, pubkey)| format!("{}:{}", amt, hex::encode(pubkey.to_bytes())))
177            .collect::<Vec<String>>()
178            .join(",");
179
180        let mut data = keys_string;
181        data.push_str(&format!("|unit:{}", unit));
182
183        if input_fee_ppk > 0 {
184            data.push_str(&format!("|input_fee_ppk:{}", input_fee_ppk));
185        }
186
187        if let Some(expiry) = expiry {
188            if expiry > 0 {
189                data.push_str(&format!("|final_expiry:{}", expiry));
190            }
191        }
192
193        let hash = Sha256::hash(data.as_bytes());
194        let hex_of_hash = hex::encode(hash.to_byte_array());
195
196        Self {
197            version: KeySetVersion::Version01,
198            id: IdBytes::V2(
199                hex::decode(&hex_of_hash[0..Self::STRLEN_V2])
200                    .expect("Keys hash could not be hex decoded")
201                    .try_into()
202                    .expect("Invalid length of hex id"),
203            ),
204        }
205    }
206
207    /// *** V1 VERSION ***
208    /// As per NUT-02:
209    ///   1. sort public keys by their amount in ascending order
210    ///   2. concatenate all public keys to one string
211    ///   3. HASH_SHA256 the concatenated public keys
212    ///   4. take the first 14 characters of the hex-encoded hash
213    ///   5. prefix it with a keyset ID version byte
214    ///
215    /// # Panics
216    ///
217    /// This function will not panic under normal circumstances as the hash output
218    /// is always valid hex and the correct length.
219    pub fn v1_from_keys(map: &Keys) -> Self {
220        let mut keys: Vec<(&Amount, &super::PublicKey)> = map.iter().collect();
221        keys.sort_by_key(|(amt, _v)| *amt);
222
223        let pubkeys_concat: Vec<u8> = keys
224            .iter()
225            .map(|(_, pubkey)| pubkey.to_bytes())
226            .collect::<Vec<[u8; 33]>>()
227            .concat();
228
229        let hash = Sha256::hash(&pubkeys_concat);
230        let hex_of_hash = hex::encode(hash.to_byte_array());
231
232        Self {
233            version: KeySetVersion::Version00,
234            id: IdBytes::V1(
235                hex::decode(&hex_of_hash[0..Self::STRLEN_V1])
236                    .expect("Keys hash could not be hex decoded")
237                    .try_into()
238                    .expect("Invalid length of hex id"),
239            ),
240        }
241    }
242
243    /// Selects the correct IDv2 from a list of keysets and the given short-id
244    /// or returns the short-id in the case of v1.
245    pub fn from_short_keyset_id(
246        short_id: &ShortKeysetId,
247        keysets_info: &[KeySetInfo],
248    ) -> Result<Self, Error> {
249        // Check prefix length
250        if short_id.prefix.len() < Self::BYTELEN_V1 || short_id.prefix.len() > Self::BYTELEN_V2 {
251            return Err(Error::MalformedShortKeysetId);
252        }
253
254        match short_id.version {
255            KeySetVersion::Version00 => {
256                let mut idbytes: [u8; Self::BYTELEN_V1] = [0u8; Self::BYTELEN_V1];
257                idbytes.copy_from_slice(&short_id.prefix[..Self::BYTELEN_V1]);
258                Ok(Self {
259                    version: short_id.version,
260                    id: IdBytes::V1(idbytes),
261                })
262            }
263            KeySetVersion::Version01 => {
264                // We return the first match or error
265                for keyset_info in keysets_info.iter() {
266                    if keyset_info.id.id.to_vec()[..short_id.prefix.len()] == short_id.prefix {
267                        return Ok(keyset_info.id);
268                    }
269                }
270                Err(Error::UnknownShortKeysetId)
271            }
272        }
273    }
274}
275
276// Used to generate a compressed unique identifier as part of the NUT13 spec
277// This is a one-way function
278impl From<Id> for u32 {
279    fn from(value: Id) -> Self {
280        let id_bytes = value.to_bytes();
281        let mut hex_bytes: [u8; 8] = [0; 8];
282        hex_bytes.copy_from_slice(&id_bytes[..8]);
283
284        let int = u64::from_be_bytes(hex_bytes);
285
286        (int % (2_u64.pow(31) - 1)) as u32
287    }
288}
289
290impl fmt::Display for Id {
291    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
292        let hex_id = match self.id {
293            IdBytes::V1(id) => hex::encode(id),
294            IdBytes::V2(id) => hex::encode(id),
295        };
296        f.write_str(&format!("{}{}", self.version, hex_id))
297    }
298}
299
300impl fmt::Debug for Id {
301    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
302        let hex_id = match self.id {
303            IdBytes::V1(id) => hex::encode(id),
304            IdBytes::V2(id) => hex::encode(id),
305        };
306        f.write_str(&format!("{}{}", self.version, hex_id))
307    }
308}
309
310impl TryFrom<String> for Id {
311    type Error = Error;
312
313    fn try_from(s: String) -> Result<Self, Self::Error> {
314        // Check that string is ASCII (required for hex) to avoid panics on byte slicing
315        // with multi-byte UTF-8 characters
316        ensure_cdk!(
317            s.is_ascii(),
318            Error::HexError(hex::Error::InvalidHexCharacter {
319                c: s.chars().find(|c| !c.is_ascii()).unwrap_or('\0'),
320                index: s.chars().position(|c| !c.is_ascii()).unwrap_or(0),
321            })
322        );
323
324        ensure_cdk!(
325            s.len() == Self::STRLEN_V1 + 2 || s.len() == Self::STRLEN_V2 + 2,
326            Error::Length
327        );
328
329        let version: KeySetVersion = KeySetVersion::from_byte(&hex::decode(&s[..2])?[0])?;
330        let id = match version {
331            KeySetVersion::Version00 => IdBytes::V1(
332                hex::decode(&s[2..])?
333                    .try_into()
334                    .map_err(|_| Error::Length)?,
335            ),
336            KeySetVersion::Version01 => IdBytes::V2(
337                hex::decode(&s[2..])?
338                    .try_into()
339                    .map_err(|_| Error::Length)?,
340            ),
341        };
342
343        Ok(Self { version, id })
344    }
345}
346
347impl FromStr for Id {
348    type Err = Error;
349
350    fn from_str(s: &str) -> Result<Self, Self::Err> {
351        Self::try_from(s.to_string())
352    }
353}
354
355impl From<Id> for String {
356    fn from(value: Id) -> Self {
357        value.to_string()
358    }
359}
360
361/// Improper prefix of the keyset ID. In case of v1, this is the whole ID.
362/// In case of v2, this is the 8-byte prefix
363#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
364#[serde(into = "String", try_from = "String")]
365#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
366pub struct ShortKeysetId {
367    /// The version of the short keyset
368    version: KeySetVersion,
369    /// The improper prefix of the keyset ID bytes
370    prefix: Vec<u8>,
371}
372
373impl ShortKeysetId {
374    /// [`ShortKeysetId`] to bytes
375    pub fn to_bytes(&self) -> Vec<u8> {
376        [vec![self.version.to_byte()], self.prefix.clone()].concat()
377    }
378
379    /// [`ShortKeysetId`] from bytes
380    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
381        if bytes.is_empty() {
382            return Err(Error::Length);
383        }
384
385        let version = KeySetVersion::from_byte(&bytes[0])?;
386        let prefix = bytes[1..].to_vec();
387        Ok(Self { version, prefix })
388    }
389}
390
391impl From<Id> for ShortKeysetId {
392    fn from(id: Id) -> Self {
393        let version = id.version;
394        let prefix: Vec<u8> = match id.version {
395            KeySetVersion::Version00 => match id.id {
396                IdBytes::V1(idbytes) => Vec::from(&idbytes),
397                _ => panic!("Unexpected IdBytes length"),
398            },
399            KeySetVersion::Version01 => match id.id {
400                IdBytes::V2(idbytes) => Vec::from(&idbytes[..7]),
401                _ => panic!("Unexpected IdBytes length"),
402            },
403        };
404
405        Self { version, prefix }
406    }
407}
408
409impl fmt::Display for ShortKeysetId {
410    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
411        let hex_id = hex::encode(&self.prefix);
412        f.write_str(&format!("{}{}", self.version, hex_id))
413    }
414}
415
416impl fmt::Debug for ShortKeysetId {
417    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
418        let hex_id = hex::encode(&self.prefix);
419        f.write_str(&format!("{}{}", self.version, hex_id))
420    }
421}
422
423impl TryFrom<String> for ShortKeysetId {
424    type Error = Error;
425
426    fn try_from(s: String) -> Result<Self, Self::Error> {
427        // Check that string is ASCII (required for hex) to avoid panics on byte slicing
428        // with multi-byte UTF-8 characters
429        ensure_cdk!(
430            s.is_ascii(),
431            Error::HexError(hex::Error::InvalidHexCharacter {
432                c: s.chars().find(|c| !c.is_ascii()).unwrap_or('\0'),
433                index: s.chars().position(|c| !c.is_ascii()).unwrap_or(0),
434            })
435        );
436
437        ensure_cdk!(s.len() == 16, Error::Length);
438
439        let version: KeySetVersion = KeySetVersion::from_byte(&hex::decode(&s[..2])?[0])?;
440        let prefix = hex::decode(&s[2..])?;
441
442        Ok(Self { version, prefix })
443    }
444}
445
446impl FromStr for ShortKeysetId {
447    type Err = Error;
448
449    fn from_str(s: &str) -> Result<Self, Self::Err> {
450        Self::try_from(s.to_string())
451    }
452}
453
454impl From<ShortKeysetId> for String {
455    fn from(value: ShortKeysetId) -> Self {
456        value.to_string()
457    }
458}
459
460/// Mint Keysets [NUT-02]
461/// Ids of mints keyset ids
462#[serde_as]
463#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
464#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
465pub struct KeysetResponse {
466    /// set of public key ids that the mint generates
467    #[serde_as(as = "VecSkipError<_>")]
468    pub keysets: Vec<KeySetInfo>,
469}
470
471/// Keyset
472#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
473#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
474pub struct KeySet {
475    /// Keyset [`Id`]
476    #[cfg_attr(feature = "swagger", schema(value_type = String))]
477    pub id: Id,
478    /// Keyset [`CurrencyUnit`]
479    pub unit: CurrencyUnit,
480    /// Keyset state - indicates whether the mint will sign new outputs with this keyset
481    #[serde(skip_serializing_if = "Option::is_none")]
482    pub active: Option<bool>,
483    /// Keyset [`Keys`]
484    pub keys: Keys,
485    /// Input Fee PPK
486    #[serde(default)]
487    pub input_fee_ppk: u64,
488    /// Expiry
489    #[serde(skip_serializing_if = "Option::is_none")]
490    pub final_expiry: Option<u64>,
491}
492
493impl KeySet {
494    /// Verify the keyset id matches keys
495    pub fn verify_id(&self) -> Result<(), Error> {
496        let keys_id = match self.id.version {
497            KeySetVersion::Version00 => Id::v1_from_keys(&self.keys),
498            KeySetVersion::Version01 => Id::v2_from_data(
499                &self.keys,
500                &self.unit,
501                self.input_fee_ppk,
502                self.final_expiry,
503            ),
504        };
505
506        ensure_cdk!(
507            u32::from(keys_id) == u32::from(self.id),
508            Error::IncorrectKeysetId
509        );
510
511        ensure_cdk!(keys_id == self.id, Error::IncorrectKeysetId);
512
513        Ok(())
514    }
515}
516
517/// KeySetInfo
518#[derive(Debug, Clone, Hash, PartialEq, Eq, Deserialize, Serialize)]
519#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
520pub struct KeySetInfo {
521    /// Keyset [`Id`]
522    #[cfg_attr(feature = "swagger", schema(value_type = String))]
523    pub id: Id,
524    /// Keyset [`CurrencyUnit`]
525    pub unit: CurrencyUnit,
526    /// Keyset state
527    /// Mint will only sign from an active keyset
528    pub active: bool,
529    /// Input Fee PPK
530    #[serde(
531        deserialize_with = "deserialize_input_fee_ppk",
532        default = "default_input_fee_ppk"
533    )]
534    pub input_fee_ppk: u64,
535    /// Expiry of the keyset
536    #[serde(skip_serializing_if = "Option::is_none")]
537    pub final_expiry: Option<u64>,
538}
539
540/// List of [KeySetInfo]
541pub type KeySetInfos = Vec<KeySetInfo>;
542
543/// Utility methods for [KeySetInfos]
544pub trait KeySetInfosMethods {
545    /// Filter for active keysets
546    fn active(&self) -> impl Iterator<Item = &KeySetInfo> + '_;
547
548    /// Filter keysets for specific unit
549    fn unit(&self, unit: CurrencyUnit) -> impl Iterator<Item = &KeySetInfo> + '_;
550}
551
552impl KeySetInfosMethods for KeySetInfos {
553    fn active(&self) -> impl Iterator<Item = &KeySetInfo> + '_ {
554        self.iter().filter(|k| k.active)
555    }
556
557    fn unit(&self, unit: CurrencyUnit) -> impl Iterator<Item = &KeySetInfo> + '_ {
558        self.iter().filter(move |k| k.unit == unit)
559    }
560}
561
562fn deserialize_input_fee_ppk<'de, D>(deserializer: D) -> Result<u64, D::Error>
563where
564    D: Deserializer<'de>,
565{
566    // This will either give us a u64 or null (which becomes None)
567    let opt = Option::<u64>::deserialize(deserializer)?;
568    Ok(opt.unwrap_or_else(default_input_fee_ppk))
569}
570
571fn default_input_fee_ppk() -> u64 {
572    0
573}
574
575#[cfg(feature = "mint")]
576/// MintKeyset
577#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
578pub struct MintKeySet {
579    /// Keyset [`Id`]
580    pub id: Id,
581    /// Keyset [`CurrencyUnit`]
582    pub unit: CurrencyUnit,
583    /// Keyset [`MintKeys`]
584    pub keys: MintKeys,
585    /// Input Fee PPK
586    #[serde(default)]
587    pub input_fee_ppk: u64,
588    #[serde(skip_serializing_if = "Option::is_none")]
589    /// Expiry [`Option<u64>`]
590    pub final_expiry: Option<u64>,
591}
592
593#[cfg(feature = "mint")]
594impl MintKeySet {
595    /// Generate new [`MintKeySet`]
596    ///
597    /// # Panics
598    ///
599    /// This function will panic if the RNG fails or if key derivation fails,
600    /// which should not happen under normal circumstances.
601    pub fn generate<C: secp256k1::Signing>(
602        secp: &Secp256k1<C>,
603        xpriv: Xpriv,
604        unit: CurrencyUnit,
605        amounts: &[u64],
606        input_fee_ppk: u64,
607        final_expiry: Option<u64>,
608        version: KeySetVersion,
609    ) -> Self {
610        let mut map = BTreeMap::new();
611        for (i, amount) in amounts.iter().enumerate() {
612            let secret_key = xpriv
613                .derive_priv(
614                    secp,
615                    &[ChildNumber::from_hardened_idx(i as u32).expect("order is valid index")],
616                )
617                .expect("RNG busted")
618                .private_key;
619            let public_key = secret_key.public_key(secp);
620            map.insert(
621                amount.into(),
622                MintKeyPair {
623                    secret_key: secret_key.into(),
624                    public_key: public_key.into(),
625                },
626            );
627        }
628
629        let keys = MintKeys::new(map);
630        let id = match version {
631            KeySetVersion::Version00 => Id::v1_from_keys(&keys.clone().into()),
632            KeySetVersion::Version01 => {
633                Id::v2_from_data(&keys.clone().into(), &unit, input_fee_ppk, final_expiry)
634            }
635        };
636        Self {
637            id,
638            unit,
639            keys,
640            input_fee_ppk,
641            final_expiry,
642        }
643    }
644
645    /// Generate new [`MintKeySet`] from seed
646    ///
647    /// # Panics
648    ///
649    /// This function will panic if the RNG fails or if key derivation fails,
650    /// which should not happen under normal circumstances.
651    #[allow(clippy::too_many_arguments)]
652    pub fn generate_from_seed<C: secp256k1::Signing>(
653        secp: &Secp256k1<C>,
654        seed: &[u8],
655        amounts: &[u64],
656        currency_unit: CurrencyUnit,
657        derivation_path: DerivationPath,
658        input_fee_ppk: u64,
659        final_expiry: Option<u64>,
660        version: KeySetVersion,
661    ) -> Self {
662        let xpriv = Xpriv::new_master(bitcoin::Network::Bitcoin, seed).expect("RNG busted");
663        Self::generate(
664            secp,
665            xpriv
666                .derive_priv(secp, &derivation_path)
667                .expect("RNG busted"),
668            currency_unit,
669            amounts,
670            input_fee_ppk,
671            final_expiry,
672            version,
673        )
674    }
675
676    /// Generate new [`MintKeySet`] from xpriv
677    ///
678    /// # Panics
679    ///
680    /// This function will panic if the RNG fails or if key derivation fails,
681    /// which should not happen under normal circumstances.
682    #[allow(clippy::too_many_arguments)]
683    pub fn generate_from_xpriv<C: secp256k1::Signing>(
684        secp: &Secp256k1<C>,
685        xpriv: Xpriv,
686        amounts: &[u64],
687        currency_unit: CurrencyUnit,
688        derivation_path: DerivationPath,
689        input_fee_ppk: u64,
690        final_expiry: Option<u64>,
691        version: KeySetVersion,
692    ) -> Self {
693        Self::generate(
694            secp,
695            xpriv
696                .derive_priv(secp, &derivation_path)
697                .expect("RNG busted"),
698            currency_unit,
699            amounts,
700            input_fee_ppk,
701            final_expiry,
702            version,
703        )
704    }
705}
706
707#[cfg(feature = "mint")]
708impl From<MintKeySet> for Id {
709    fn from(keyset: MintKeySet) -> Id {
710        let keys: Keys = keyset.keys.into();
711        match keyset.id.version {
712            KeySetVersion::Version00 => Id::v1_from_keys(&keys),
713            KeySetVersion::Version01 => Id::v2_from_data(
714                &keys,
715                &keyset.unit,
716                keyset.input_fee_ppk,
717                keyset.final_expiry,
718            ),
719        }
720    }
721}
722
723#[cfg(feature = "mint")]
724impl From<&MintKeys> for Id {
725    fn from(map: &MintKeys) -> Self {
726        let keys: super::Keys = map.clone().into();
727
728        Id::v1_from_keys(&keys)
729    }
730}
731
732#[cfg(test)]
733mod test {
734    use std::str::FromStr;
735
736    use bitcoin::secp256k1::rand::{self, RngCore};
737
738    use super::{KeySetInfo, KeySetVersion, Keys, KeysetResponse, ShortKeysetId};
739    use crate::nuts::nut02::{Error, Id};
740    use crate::nuts::KeysResponse;
741    use crate::util::hex;
742    use crate::CurrencyUnit;
743
744    const SHORT_KEYSET_ID: &str = "00456a94ab4e1c46";
745    const SHORT_KEYSET: &str = r#"
746        {
747            "1":"03a40f20667ed53513075dc51e715ff2046cad64eb68960632269ba7f0210e38bc",
748            "2":"03fd4ce5a16b65576145949e6f99f445f8249fee17c606b688b504a849cdc452de",
749            "4":"02648eccfa4c026960966276fa5a4cae46ce0fd432211a4f449bf84f13aa5f8303",
750            "8":"02fdfd6796bfeac490cbee12f778f867f0a2c68f6508d17c649759ea0dc3547528"
751        }
752    "#;
753
754    const KEYSET_ID: &str = "000f01df73ea149a";
755    const KEYSET: &str = r#"
756        {
757            "1":"03ba786a2c0745f8c30e490288acd7a72dd53d65afd292ddefa326a4a3fa14c566",
758            "2":"03361cd8bd1329fea797a6add1cf1990ffcf2270ceb9fc81eeee0e8e9c1bd0cdf5",
759            "4":"036e378bcf78738ddf68859293c69778035740e41138ab183c94f8fee7572214c7",
760            "8":"03909d73beaf28edfb283dbeb8da321afd40651e8902fcf5454ecc7d69788626c0",
761            "16":"028a36f0e6638ea7466665fe174d958212723019ec08f9ce6898d897f88e68aa5d",
762            "32":"03a97a40e146adee2687ac60c2ba2586a90f970de92a9d0e6cae5a4b9965f54612",
763            "64":"03ce86f0c197aab181ddba0cfc5c5576e11dfd5164d9f3d4a3fc3ffbbf2e069664",
764            "128":"0284f2c06d938a6f78794814c687560a0aabab19fe5e6f30ede38e113b132a3cb9",
765            "256":"03b99f475b68e5b4c0ba809cdecaae64eade2d9787aa123206f91cd61f76c01459",
766            "512":"03d4db82ea19a44d35274de51f78af0a710925fe7d9e03620b84e3e9976e3ac2eb",
767            "1024":"031fbd4ba801870871d46cf62228a1b748905ebc07d3b210daf48de229e683f2dc",
768            "2048":"0276cedb9a3b160db6a158ad4e468d2437f021293204b3cd4bf6247970d8aff54b",
769            "4096":"02fc6b89b403ee9eb8a7ed457cd3973638080d6e04ca8af7307c965c166b555ea2",
770            "8192":"0320265583e916d3a305f0d2687fcf2cd4e3cd03a16ea8261fda309c3ec5721e21",
771            "16384":"036e41de58fdff3cb1d8d713f48c63bc61fa3b3e1631495a444d178363c0d2ed50",
772            "32768":"0365438f613f19696264300b069d1dad93f0c60a37536b72a8ab7c7366a5ee6c04",
773            "65536":"02408426cfb6fc86341bac79624ba8708a4376b2d92debdf4134813f866eb57a8d",
774            "131072":"031063e9f11c94dc778c473e968966eac0e70b7145213fbaff5f7a007e71c65f41",
775            "262144":"02f2a3e808f9cd168ec71b7f328258d0c1dda250659c1aced14c7f5cf05aab4328",
776            "524288":"038ac10de9f1ff9395903bb73077e94dbf91e9ef98fd77d9a2debc5f74c575bc86",
777            "1048576":"0203eaee4db749b0fc7c49870d082024b2c31d889f9bc3b32473d4f1dfa3625788",
778            "2097152":"033cdb9d36e1e82ae652b7b6a08e0204569ec7ff9ebf85d80a02786dc7fe00b04c",
779            "4194304":"02c8b73f4e3a470ae05e5f2fe39984d41e9f6ae7be9f3b09c9ac31292e403ac512",
780            "8388608":"025bbe0cfce8a1f4fbd7f3a0d4a09cb6badd73ef61829dc827aa8a98c270bc25b0",
781            "16777216":"037eec3d1651a30a90182d9287a5c51386fe35d4a96839cf7969c6e2a03db1fc21",
782            "33554432":"03280576b81a04e6abd7197f305506476f5751356b7643988495ca5c3e14e5c262",
783            "67108864":"03268bfb05be1dbb33ab6e7e00e438373ca2c9b9abc018fdb452d0e1a0935e10d3",
784            "134217728":"02573b68784ceba9617bbcc7c9487836d296aa7c628c3199173a841e7a19798020",
785            "268435456":"0234076b6e70f7fbf755d2227ecc8d8169d662518ee3a1401f729e2a12ccb2b276",
786            "536870912":"03015bd88961e2a466a2163bd4248d1d2b42c7c58a157e594785e7eb34d880efc9",
787            "1073741824":"02c9b076d08f9020ebee49ac8ba2610b404d4e553a4f800150ceb539e9421aaeee",
788            "2147483648":"034d592f4c366afddc919a509600af81b489a03caf4f7517c2b3f4f2b558f9a41a",
789            "4294967296":"037c09ecb66da082981e4cbdb1ac65c0eb631fc75d85bed13efb2c6364148879b5",
790            "8589934592":"02b4ebb0dda3b9ad83b39e2e31024b777cc0ac205a96b9a6cfab3edea2912ed1b3",
791            "17179869184":"026cc4dacdced45e63f6e4f62edbc5779ccd802e7fabb82d5123db879b636176e9",
792            "34359738368":"02b2cee01b7d8e90180254459b8f09bbea9aad34c3a2fd98c85517ecfc9805af75",
793            "68719476736":"037a0c0d564540fc574b8bfa0253cca987b75466e44b295ed59f6f8bd41aace754",
794            "137438953472":"021df6585cae9b9ca431318a713fd73dbb76b3ef5667957e8633bca8aaa7214fb6",
795            "274877906944":"02b8f53dde126f8c85fa5bb6061c0be5aca90984ce9b902966941caf963648d53a",
796            "549755813888":"029cc8af2840d59f1d8761779b2496623c82c64be8e15f9ab577c657c6dd453785",
797            "1099511627776":"03e446fdb84fad492ff3a25fc1046fb9a93a5b262ebcd0151caa442ea28959a38a",
798            "2199023255552":"02d6b25bd4ab599dd0818c55f75702fde603c93f259222001246569018842d3258",
799            "4398046511104":"03397b522bb4e156ec3952d3f048e5a986c20a00718e5e52cd5718466bf494156a",
800            "8796093022208":"02d1fb9e78262b5d7d74028073075b80bb5ab281edcfc3191061962c1346340f1e",
801            "17592186044416":"030d3f2ad7a4ca115712ff7f140434f802b19a4c9b2dd1c76f3e8e80c05c6a9310",
802            "35184372088832":"03e325b691f292e1dfb151c3fb7cad440b225795583c32e24e10635a80e4221c06",
803            "70368744177664":"03bee8f64d88de3dee21d61f89efa32933da51152ddbd67466bef815e9f93f8fd1",
804            "140737488355328":"0327244c9019a4892e1f04ba3bf95fe43b327479e2d57c25979446cc508cd379ed",
805            "281474976710656":"02fb58522cd662f2f8b042f8161caae6e45de98283f74d4e99f19b0ea85e08a56d",
806            "562949953421312":"02adde4b466a9d7e59386b6a701a39717c53f30c4810613c1b55e6b6da43b7bc9a",
807            "1125899906842624":"038eeda11f78ce05c774f30e393cda075192b890d68590813ff46362548528dca9",
808            "2251799813685248":"02ec13e0058b196db80f7079d329333b330dc30c000dbdd7397cbbc5a37a664c4f",
809            "4503599627370496":"02d2d162db63675bd04f7d56df04508840f41e2ad87312a3c93041b494efe80a73",
810            "9007199254740992":"0356969d6aef2bb40121dbd07c68b6102339f4ea8e674a9008bb69506795998f49",
811            "18014398509481984":"02f4e667567ebb9f4e6e180a4113bb071c48855f657766bb5e9c776a880335d1d6",
812            "36028797018963968":"0385b4fe35e41703d7a657d957c67bb536629de57b7e6ee6fe2130728ef0fc90b0",
813            "72057594037927936":"02b2bc1968a6fddbcc78fb9903940524824b5f5bed329c6ad48a19b56068c144fd",
814            "144115188075855872":"02e0dbb24f1d288a693e8a49bc14264d1276be16972131520cf9e055ae92fba19a",
815            "288230376151711744":"03efe75c106f931a525dc2d653ebedddc413a2c7d8cb9da410893ae7d2fa7d19cc",
816            "576460752303423488":"02c7ec2bd9508a7fc03f73c7565dc600b30fd86f3d305f8f139c45c404a52d958a",
817            "1152921504606846976":"035a6679c6b25e68ff4e29d1c7ef87f21e0a8fc574f6a08c1aa45ff352c1d59f06",
818            "2305843009213693952":"033cdc225962c052d485f7cfbf55a5b2367d200fe1fe4373a347deb4cc99e9a099",
819            "4611686018427387904":"024a4b806cf413d14b294719090a9da36ba75209c7657135ad09bc65328fba9e6f",
820            "9223372036854775808":"0377a6fe114e291a8d8e991627c38001c8305b23b9e98b1c7b1893f5cd0dda6cad"
821        }
822    "#;
823
824    #[test]
825    fn test_deserialization_and_id_generation() {
826        let _id = Id::from_str("009a1f293253e41e").unwrap();
827
828        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();
829
830        let id: Id = Id::v1_from_keys(&keys);
831
832        assert_eq!(id, Id::from_str(SHORT_KEYSET_ID).unwrap());
833
834        let keys: Keys = serde_json::from_str(KEYSET).unwrap();
835
836        let id: Id = Id::v1_from_keys(&keys);
837
838        assert_eq!(id, Id::from_str(KEYSET_ID).unwrap());
839    }
840
841    #[test]
842    fn test_v2_deserialization_and_id_generation() {
843        let unit: CurrencyUnit = CurrencyUnit::from_str("sat").unwrap();
844        let expiry: u64 = 2059210353; // +10 years from now
845        let input_fee_ppk = 100;
846
847        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();
848        let id_from_str =
849            Id::from_str("015ba18a8adcd02e715a58358eb618da4a4b3791151a4bee5e968bb88406ccf76a")
850                .unwrap();
851        let id = Id::v2_from_data(&keys, &unit, input_fee_ppk, Some(expiry));
852        assert_eq!(id, id_from_str);
853
854        let keys: Keys = serde_json::from_str(KEYSET).unwrap();
855        let id_from_str =
856            Id::from_str("01ab6aa4ff30390da34986d84be5274b48ad7a74265d791095bfc39f4098d9764f")
857                .unwrap();
858        let id = Id::v2_from_data(&keys, &unit, 0, Some(expiry));
859        assert_eq!(id, id_from_str);
860
861        let id = Id::v2_from_data(&keys, &unit, 0, None);
862        let id_from_str =
863            Id::from_str("012fbb01a4e200c76df911eeba3b8fe1831202914b24664f4bccbd25852a6708f8")
864                .unwrap();
865        assert_eq!(id, id_from_str);
866    }
867
868    #[test]
869    fn test_deserialization_keyset_info() {
870        let h = r#"{"id":"009a1f293253e41e","unit":"sat","active":true}"#;
871
872        let _keyset_response: KeySetInfo = serde_json::from_str(h).unwrap();
873
874        let h = r#"{"id":"009a1f293253e41e","unit":"sat","active":true, "input_fee_ppk":null}"#;
875
876        let _keyset_response: KeySetInfo = serde_json::from_str(h).unwrap();
877    }
878
879    #[test]
880    fn test_deserialization_of_keyset_response() {
881        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}]}"#;
882
883        let _keyset_response: KeysetResponse = serde_json::from_str(h).unwrap();
884    }
885
886    #[test]
887    fn test_to_int() {
888        let id = Id::from_str("009a1f293253e41e").unwrap();
889
890        let id_int = u32::from(id);
891        assert_eq!(864559728, id_int)
892    }
893
894    #[test]
895    fn test_v2_to_int() {
896        let id = Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
897            .unwrap();
898
899        let id_int = u32::from(id);
900        assert_eq!(2113471806, id_int);
901    }
902
903    #[test]
904    fn test_id_from_invalid_byte_length() {
905        let three_bytes = [0x01, 0x02, 0x03];
906        let result = Id::from_bytes(&three_bytes);
907        assert!(result.is_err(), "Expected an invalid byte length error");
908    }
909
910    #[test]
911    fn test_keyset_bytes() {
912        let id = Id::from_str("009a1f293253e41e").unwrap();
913
914        let id_bytes = id.to_bytes();
915
916        assert_eq!(id_bytes.len(), 8);
917
918        let id_from_bytes = Id::from_bytes(&id_bytes).unwrap();
919
920        assert_eq!(id_from_bytes, id);
921    }
922
923    #[test]
924    fn test_deserialization_keys_response() {
925        let keys = 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926
927        let keys_response: KeysResponse = serde_json::from_str(keys).unwrap();
928
929        assert_eq!(keys_response.keysets.len(), 2);
930    }
931
932    fn generate_random_id(version: KeySetVersion) -> Id {
933        match version {
934            KeySetVersion::Version00 => {
935                let mut rand_bytes = vec![0u8; 8];
936                rand::thread_rng().fill_bytes(&mut rand_bytes[1..]);
937                Id::from_bytes(&rand_bytes).unwrap_or_else(|e| {
938                    panic!("Failed to create Id from {}: {e}", hex::encode(rand_bytes))
939                })
940            }
941            KeySetVersion::Version01 => {
942                let mut rand_bytes = vec![1u8; 33];
943                rand::thread_rng().fill_bytes(&mut rand_bytes[1..]);
944                Id::from_bytes(&rand_bytes).unwrap_or_else(|e| {
945                    panic!("Failed to create Id from {}: {e}", hex::encode(rand_bytes))
946                })
947            }
948        }
949    }
950
951    #[test]
952    fn test_id_serialization() {
953        let id = generate_random_id(KeySetVersion::Version00);
954        let id_str = id.to_string();
955
956        assert!(id_str.chars().all(|c| c.is_ascii_hexdigit()));
957        assert_eq!(16, id_str.len());
958        assert_eq!(id_str.to_lowercase(), id_str);
959    }
960
961    #[test]
962    fn test_id_v2_serialization() {
963        let id = generate_random_id(KeySetVersion::Version01);
964        let id_str = id.to_string();
965
966        assert!(id_str.chars().all(|c| c.is_ascii_hexdigit()));
967        assert_eq!(66, id_str.len());
968        assert_eq!(id_str.to_lowercase(), id_str);
969    }
970
971    #[test]
972    fn test_id_deserialization() {
973        let id_from_short_str = Id::from_str("00123");
974        assert!(matches!(id_from_short_str, Err(Error::Length)));
975
976        let id_from_non_hex_str = Id::from_str(&SHORT_KEYSET_ID.replace('a', "x"));
977        assert!(matches!(id_from_non_hex_str, Err(Error::HexError(_))));
978
979        let id_invalid_version = Id::from_str(&SHORT_KEYSET_ID.replace("00", "99"));
980        assert!(matches!(id_invalid_version, Err(Error::UnknownVersion)));
981
982        let id_from_uppercase = Id::from_str(&SHORT_KEYSET_ID.to_uppercase());
983        assert!(id_from_uppercase.is_ok());
984    }
985
986    #[test]
987    fn test_short_keyset_id_from_id() {
988        let idv1 = Id::from_str("009a1f293253e41e").unwrap();
989        let idv2 =
990            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
991                .unwrap();
992
993        let short_id_1: ShortKeysetId = idv1.into();
994        let short_id_2: ShortKeysetId = idv2.into();
995
996        assert!(short_id_1.to_string() == "009a1f293253e41e");
997        assert!(short_id_2.to_string() == "01adc013fa9d8517");
998    }
999
1000    #[test]
1001    fn test_id_with_non_ascii_chars() {
1002        // Test that non-ASCII characters in ID strings don't cause panics
1003        // but instead return proper errors. This was found by fuzzing.
1004        // The character 'ǝ' is a 2-byte UTF-8 sequence that could cause
1005        // panics when slicing by byte index.
1006        let id_with_non_ascii = Id::from_str("0ǝfa73302d12ff{");
1007        assert!(matches!(id_with_non_ascii, Err(Error::HexError(_))));
1008
1009        // Also test ShortKeysetId
1010        let short_id_with_non_ascii = ShortKeysetId::from_str("0ǝfa73302d12ff");
1011        assert!(matches!(short_id_with_non_ascii, Err(Error::HexError(_))));
1012    }
1013}
cashu/nuts/nut02.rs

cashu/nuts/
nut02.rs
