cdk/crates/cdk-common/src/nuts/nut02.rs

//! NUT-02: Keysets and keyset ID
//!
//! <https://github.com/cashubtc/nuts/blob/main/02.md>

use core::fmt;
use core::str::FromStr;
use std::array::TryFromSliceError;
use std::collections::BTreeMap;

use bitcoin::bip32::{ChildNumber, DerivationPath, Xpriv};
use bitcoin::hashes::sha256::Hash as Sha256;
use bitcoin::hashes::Hash;
use bitcoin::key::Secp256k1;
use bitcoin::secp256k1;
use serde::{Deserialize, Serialize};
use serde_with::{serde_as, VecSkipError};
use thiserror::Error;

use super::nut01::{Keys, MintKeyPair, MintKeys};
use crate::amount::AmountStr;
use crate::nuts::nut00::CurrencyUnit;
use crate::util::hex;
use crate::Amount;

/// NUT02 Error
#[derive(Debug, Error)]
pub enum Error {
    /// Hex Error
    #[error(transparent)]
    HexError(#[from] hex::Error),
    /// Keyset length error
    #[error("NUT02: ID length invalid")]
    Length,
    /// Unknown version
    #[error("NUT02: Unknown Version")]
    UnknownVersion,
    /// Keyset id does not match
    #[error("Keyset id incorrect")]
    IncorrectKeysetId,
    /// Slice Error
    #[error(transparent)]
    Slice(#[from] TryFromSliceError),
}

/// Keyset version
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
pub enum KeySetVersion {
    /// Current Version 00
    Version00,
}

impl KeySetVersion {
    /// [`KeySetVersion`] to byte
    pub fn to_byte(&self) -> u8 {
        match self {
            Self::Version00 => 0,
        }
    }

    /// [`KeySetVersion`] from byte
    pub fn from_byte(byte: &u8) -> Result<Self, Error> {
        match byte {
            0 => Ok(Self::Version00),
            _ => Err(Error::UnknownVersion),
        }
    }
}

impl fmt::Display for KeySetVersion {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            KeySetVersion::Version00 => f.write_str("00"),
        }
    }
}

/// A keyset ID is an identifier for a specific keyset. It can be derived by
/// anyone who knows the set of public keys of a mint. The keyset ID **CAN**
/// be stored in a Cashu token such that the token can be used to identify
/// which mint or keyset it was generated from.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
#[serde(into = "String", try_from = "String")]
#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema), schema(as = String))]
pub struct Id {
    version: KeySetVersion,
    id: [u8; Self::BYTELEN],
}

impl Id {
    const STRLEN: usize = 14;
    const BYTELEN: usize = 7;

    /// [`Id`] to bytes
    pub fn to_bytes(&self) -> Vec<u8> {
        [vec![self.version.to_byte()], self.id.to_vec()].concat()
    }

    /// [`Id`] from bytes
    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
        Ok(Self {
            version: KeySetVersion::from_byte(&bytes[0])?,
            id: bytes[1..].try_into()?,
        })
    }

    /// [`Id`] as bytes
    pub fn as_bytes(&self) -> [u8; Self::BYTELEN + 1] {
        let mut bytes = [0u8; Self::BYTELEN + 1];
        bytes[0] = self.version.to_byte();
        bytes[1..].copy_from_slice(&self.id);
        bytes
    }
}

// Used to generate a compressed unique identifier as part of the NUT13 spec
// This is a one-way function
impl From<Id> for u32 {
    fn from(value: Id) -> Self {
        let hex_bytes: [u8; 8] = value.as_bytes();

        let int = u64::from_be_bytes(hex_bytes);

        (int % (2_u64.pow(31) - 1)) as u32
    }
}

impl fmt::Display for Id {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(&format!("{}{}", self.version, hex::encode(self.id)))
    }
}

impl TryFrom<String> for Id {
    type Error = Error;

    fn try_from(s: String) -> Result<Self, Self::Error> {
        if s.len() != 16 {
            return Err(Error::Length);
        }

        Ok(Self {
            version: KeySetVersion::from_byte(&hex::decode(&s[..2])?[0])?,
            id: hex::decode(&s[2..])?
                .try_into()
                .map_err(|_| Error::Length)?,
        })
    }
}

impl FromStr for Id {
    type Err = Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Self::try_from(s.to_string())
    }
}

impl From<Id> for String {
    fn from(value: Id) -> Self {
        value.to_string()
    }
}

impl From<&Keys> for Id {
    /// As per NUT-02:
    ///   1. sort public keys by their amount in ascending order
    ///   2. concatenate all public keys to one string
    ///   3. HASH_SHA256 the concatenated public keys
    ///   4. take the first 14 characters of the hex-encoded hash
    ///   5. prefix it with a keyset ID version byte
    fn from(map: &Keys) -> Self {
        let mut keys: Vec<(&AmountStr, &super::PublicKey)> = map.iter().collect();
        keys.sort_by_key(|(amt, _v)| *amt);

        let pubkeys_concat: Vec<u8> = keys
            .iter()
            .map(|(_, pubkey)| pubkey.to_bytes())
            .collect::<Vec<[u8; 33]>>()
            .concat();

        let hash = Sha256::hash(&pubkeys_concat);
        let hex_of_hash = hex::encode(hash.to_byte_array());

        Self {
            version: KeySetVersion::Version00,
            id: hex::decode(&hex_of_hash[0..Self::STRLEN])
                .expect("Keys hash could not be hex decoded")
                .try_into()
                .expect("Invalid length of hex id"),
        }
    }
}

/// Mint Keysets [NUT-02]
/// Ids of mints keyset ids
#[serde_as]
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
pub struct KeysetResponse {
    /// set of public key ids that the mint generates
    #[serde_as(as = "VecSkipError<_>")]
    pub keysets: Vec<KeySetInfo>,
}

/// Keyset
#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
pub struct KeySet {
    /// Keyset [`Id`]
    pub id: Id,
    /// Keyset [`CurrencyUnit`]
    pub unit: CurrencyUnit,
    /// Keyset [`Keys`]
    pub keys: Keys,
}

impl KeySet {
    /// Verify the keyset is matches keys
    pub fn verify_id(&self) -> Result<(), Error> {
        let keys_id: Id = (&self.keys).into();

        if keys_id != self.id {
            return Err(Error::IncorrectKeysetId);
        }

        Ok(())
    }
}

impl From<MintKeySet> for KeySet {
    fn from(keyset: MintKeySet) -> Self {
        Self {
            id: keyset.id,
            unit: keyset.unit,
            keys: Keys::from(keyset.keys),
        }
    }
}

/// KeySetInfo
#[derive(Debug, Clone, Hash, PartialEq, Eq, Deserialize, Serialize)]
#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
pub struct KeySetInfo {
    /// Keyset [`Id`]
    pub id: Id,
    /// Keyset [`CurrencyUnit`]
    pub unit: CurrencyUnit,
    /// Keyset state
    /// Mint will only sign from an active keyset
    pub active: bool,
    /// Input Fee PPK
    #[serde(default = "default_input_fee_ppk")]
    pub input_fee_ppk: u64,
}

fn default_input_fee_ppk() -> u64 {
    0
}

/// MintKeyset
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct MintKeySet {
    /// Keyset [`Id`]
    pub id: Id,
    /// Keyset [`CurrencyUnit`]
    pub unit: CurrencyUnit,
    /// Keyset [`MintKeys`]
    pub keys: MintKeys,
}

impl MintKeySet {
    /// Generate new [`MintKeySet`]
    pub fn generate<C: secp256k1::Signing>(
        secp: &Secp256k1<C>,
        xpriv: Xpriv,
        unit: CurrencyUnit,
        max_order: u8,
    ) -> Self {
        let mut map = BTreeMap::new();
        for i in 0..max_order {
            let amount = Amount::from(2_u64.pow(i as u32));
            let secret_key = xpriv
                .derive_priv(
                    secp,
                    &[ChildNumber::from_hardened_idx(i as u32).expect("order is valid index")],
                )
                .expect("RNG busted")
                .private_key;
            let public_key = secret_key.public_key(secp);
            map.insert(
                amount,
                MintKeyPair {
                    secret_key: secret_key.into(),
                    public_key: public_key.into(),
                },
            );
        }

        let keys = MintKeys::new(map);
        Self {
            id: (&keys).into(),
            unit,
            keys,
        }
    }

    /// Generate new [`MintKeySet`] from seed
    pub fn generate_from_seed<C: secp256k1::Signing>(
        secp: &Secp256k1<C>,
        seed: &[u8],
        max_order: u8,
        currency_unit: CurrencyUnit,
        derivation_path: DerivationPath,
    ) -> Self {
        let xpriv = Xpriv::new_master(bitcoin::Network::Bitcoin, seed).expect("RNG busted");
        Self::generate(
            secp,
            xpriv
                .derive_priv(secp, &derivation_path)
                .expect("RNG busted"),
            currency_unit,
            max_order,
        )
    }

    /// Generate new [`MintKeySet`] from xpriv
    pub fn generate_from_xpriv<C: secp256k1::Signing>(
        secp: &Secp256k1<C>,
        xpriv: Xpriv,
        max_order: u8,
        currency_unit: CurrencyUnit,
        derivation_path: DerivationPath,
    ) -> Self {
        Self::generate(
            secp,
            xpriv
                .derive_priv(secp, &derivation_path)
                .expect("RNG busted"),
            currency_unit,
            max_order,
        )
    }
}

impl From<MintKeySet> for Id {
    fn from(keyset: MintKeySet) -> Id {
        let keys: super::KeySet = keyset.into();

        Id::from(&keys.keys)
    }
}

impl From<&MintKeys> for Id {
    fn from(map: &MintKeys) -> Self {
        let keys: super::Keys = map.clone().into();

        Id::from(&keys)
    }
}

#[cfg(test)]
mod test {
    use std::str::FromStr;

    use rand::RngCore;

    use super::{KeySetInfo, Keys, KeysetResponse};
    use crate::nuts::nut02::{Error, Id};
    use crate::nuts::KeysResponse;
    use crate::util::hex;

    const SHORT_KEYSET_ID: &str = "00456a94ab4e1c46";
    const SHORT_KEYSET: &str = r#"
        {
            "1":"03a40f20667ed53513075dc51e715ff2046cad64eb68960632269ba7f0210e38bc",
            "2":"03fd4ce5a16b65576145949e6f99f445f8249fee17c606b688b504a849cdc452de",
            "4":"02648eccfa4c026960966276fa5a4cae46ce0fd432211a4f449bf84f13aa5f8303",
            "8":"02fdfd6796bfeac490cbee12f778f867f0a2c68f6508d17c649759ea0dc3547528"
        }
    "#;

    const KEYSET_ID: &str = "000f01df73ea149a";
    const KEYSET: &str = r#"
        {
            "1":"03ba786a2c0745f8c30e490288acd7a72dd53d65afd292ddefa326a4a3fa14c566",
            "2":"03361cd8bd1329fea797a6add1cf1990ffcf2270ceb9fc81eeee0e8e9c1bd0cdf5",
            "4":"036e378bcf78738ddf68859293c69778035740e41138ab183c94f8fee7572214c7",
            "8":"03909d73beaf28edfb283dbeb8da321afd40651e8902fcf5454ecc7d69788626c0",
            "16":"028a36f0e6638ea7466665fe174d958212723019ec08f9ce6898d897f88e68aa5d",
            "32":"03a97a40e146adee2687ac60c2ba2586a90f970de92a9d0e6cae5a4b9965f54612",
            "64":"03ce86f0c197aab181ddba0cfc5c5576e11dfd5164d9f3d4a3fc3ffbbf2e069664",
            "128":"0284f2c06d938a6f78794814c687560a0aabab19fe5e6f30ede38e113b132a3cb9",
            "256":"03b99f475b68e5b4c0ba809cdecaae64eade2d9787aa123206f91cd61f76c01459",
            "512":"03d4db82ea19a44d35274de51f78af0a710925fe7d9e03620b84e3e9976e3ac2eb",
            "1024":"031fbd4ba801870871d46cf62228a1b748905ebc07d3b210daf48de229e683f2dc",
            "2048":"0276cedb9a3b160db6a158ad4e468d2437f021293204b3cd4bf6247970d8aff54b",
            "4096":"02fc6b89b403ee9eb8a7ed457cd3973638080d6e04ca8af7307c965c166b555ea2",
            "8192":"0320265583e916d3a305f0d2687fcf2cd4e3cd03a16ea8261fda309c3ec5721e21",
            "16384":"036e41de58fdff3cb1d8d713f48c63bc61fa3b3e1631495a444d178363c0d2ed50",
            "32768":"0365438f613f19696264300b069d1dad93f0c60a37536b72a8ab7c7366a5ee6c04",
            "65536":"02408426cfb6fc86341bac79624ba8708a4376b2d92debdf4134813f866eb57a8d",
            "131072":"031063e9f11c94dc778c473e968966eac0e70b7145213fbaff5f7a007e71c65f41",
            "262144":"02f2a3e808f9cd168ec71b7f328258d0c1dda250659c1aced14c7f5cf05aab4328",
            "524288":"038ac10de9f1ff9395903bb73077e94dbf91e9ef98fd77d9a2debc5f74c575bc86",
            "1048576":"0203eaee4db749b0fc7c49870d082024b2c31d889f9bc3b32473d4f1dfa3625788",
            "2097152":"033cdb9d36e1e82ae652b7b6a08e0204569ec7ff9ebf85d80a02786dc7fe00b04c",
            "4194304":"02c8b73f4e3a470ae05e5f2fe39984d41e9f6ae7be9f3b09c9ac31292e403ac512",
            "8388608":"025bbe0cfce8a1f4fbd7f3a0d4a09cb6badd73ef61829dc827aa8a98c270bc25b0",
            "16777216":"037eec3d1651a30a90182d9287a5c51386fe35d4a96839cf7969c6e2a03db1fc21",
            "33554432":"03280576b81a04e6abd7197f305506476f5751356b7643988495ca5c3e14e5c262",
            "67108864":"03268bfb05be1dbb33ab6e7e00e438373ca2c9b9abc018fdb452d0e1a0935e10d3",
            "134217728":"02573b68784ceba9617bbcc7c9487836d296aa7c628c3199173a841e7a19798020",
            "268435456":"0234076b6e70f7fbf755d2227ecc8d8169d662518ee3a1401f729e2a12ccb2b276",
            "536870912":"03015bd88961e2a466a2163bd4248d1d2b42c7c58a157e594785e7eb34d880efc9",
            "1073741824":"02c9b076d08f9020ebee49ac8ba2610b404d4e553a4f800150ceb539e9421aaeee",
            "2147483648":"034d592f4c366afddc919a509600af81b489a03caf4f7517c2b3f4f2b558f9a41a",
            "4294967296":"037c09ecb66da082981e4cbdb1ac65c0eb631fc75d85bed13efb2c6364148879b5",
            "8589934592":"02b4ebb0dda3b9ad83b39e2e31024b777cc0ac205a96b9a6cfab3edea2912ed1b3",
            "17179869184":"026cc4dacdced45e63f6e4f62edbc5779ccd802e7fabb82d5123db879b636176e9",
            "34359738368":"02b2cee01b7d8e90180254459b8f09bbea9aad34c3a2fd98c85517ecfc9805af75",
            "68719476736":"037a0c0d564540fc574b8bfa0253cca987b75466e44b295ed59f6f8bd41aace754",
            "137438953472":"021df6585cae9b9ca431318a713fd73dbb76b3ef5667957e8633bca8aaa7214fb6",
            "274877906944":"02b8f53dde126f8c85fa5bb6061c0be5aca90984ce9b902966941caf963648d53a",
            "549755813888":"029cc8af2840d59f1d8761779b2496623c82c64be8e15f9ab577c657c6dd453785",
            "1099511627776":"03e446fdb84fad492ff3a25fc1046fb9a93a5b262ebcd0151caa442ea28959a38a",
            "2199023255552":"02d6b25bd4ab599dd0818c55f75702fde603c93f259222001246569018842d3258",
            "4398046511104":"03397b522bb4e156ec3952d3f048e5a986c20a00718e5e52cd5718466bf494156a",
            "8796093022208":"02d1fb9e78262b5d7d74028073075b80bb5ab281edcfc3191061962c1346340f1e",
            "17592186044416":"030d3f2ad7a4ca115712ff7f140434f802b19a4c9b2dd1c76f3e8e80c05c6a9310",
            "35184372088832":"03e325b691f292e1dfb151c3fb7cad440b225795583c32e24e10635a80e4221c06",
            "70368744177664":"03bee8f64d88de3dee21d61f89efa32933da51152ddbd67466bef815e9f93f8fd1",
            "140737488355328":"0327244c9019a4892e1f04ba3bf95fe43b327479e2d57c25979446cc508cd379ed",
            "281474976710656":"02fb58522cd662f2f8b042f8161caae6e45de98283f74d4e99f19b0ea85e08a56d",
            "562949953421312":"02adde4b466a9d7e59386b6a701a39717c53f30c4810613c1b55e6b6da43b7bc9a",
            "1125899906842624":"038eeda11f78ce05c774f30e393cda075192b890d68590813ff46362548528dca9",
            "2251799813685248":"02ec13e0058b196db80f7079d329333b330dc30c000dbdd7397cbbc5a37a664c4f",
            "4503599627370496":"02d2d162db63675bd04f7d56df04508840f41e2ad87312a3c93041b494efe80a73",
            "9007199254740992":"0356969d6aef2bb40121dbd07c68b6102339f4ea8e674a9008bb69506795998f49",
            "18014398509481984":"02f4e667567ebb9f4e6e180a4113bb071c48855f657766bb5e9c776a880335d1d6",
            "36028797018963968":"0385b4fe35e41703d7a657d957c67bb536629de57b7e6ee6fe2130728ef0fc90b0",
            "72057594037927936":"02b2bc1968a6fddbcc78fb9903940524824b5f5bed329c6ad48a19b56068c144fd",
            "144115188075855872":"02e0dbb24f1d288a693e8a49bc14264d1276be16972131520cf9e055ae92fba19a",
            "288230376151711744":"03efe75c106f931a525dc2d653ebedddc413a2c7d8cb9da410893ae7d2fa7d19cc",
            "576460752303423488":"02c7ec2bd9508a7fc03f73c7565dc600b30fd86f3d305f8f139c45c404a52d958a",
            "1152921504606846976":"035a6679c6b25e68ff4e29d1c7ef87f21e0a8fc574f6a08c1aa45ff352c1d59f06",
            "2305843009213693952":"033cdc225962c052d485f7cfbf55a5b2367d200fe1fe4373a347deb4cc99e9a099",
            "4611686018427387904":"024a4b806cf413d14b294719090a9da36ba75209c7657135ad09bc65328fba9e6f",
            "9223372036854775808":"0377a6fe114e291a8d8e991627c38001c8305b23b9e98b1c7b1893f5cd0dda6cad"
        }
    "#;

    #[test]
    fn test_deserialization_and_id_generation() {
        let _id = Id::from_str("009a1f293253e41e").unwrap();

        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();

        let id: Id = (&keys).into();

        assert_eq!(id, Id::from_str(SHORT_KEYSET_ID).unwrap());

        let keys: Keys = serde_json::from_str(KEYSET).unwrap();

        let id: Id = (&keys).into();

        assert_eq!(id, Id::from_str(KEYSET_ID).unwrap());
    }

    #[test]
    fn test_deserialization_keyset_info() {
        let h = r#"{"id":"009a1f293253e41e","unit":"sat","active":true}"#;

        let _keyset_response: KeySetInfo = serde_json::from_str(h).unwrap();
    }

    #[test]
    fn test_deserialization_of_keyset_response() {
        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}]}"#;

        let _keyset_response: KeysetResponse = serde_json::from_str(h).unwrap();
    }

    #[test]
    fn test_to_int() {
        let id = Id::from_str("009a1f293253e41e").unwrap();

        let id_int = u32::from(id);
        assert_eq!(864559728, id_int)
    }

    #[test]
    fn test_id_from_invalid_byte_length() {
        let three_bytes = [0x01, 0x02, 0x03];
        let result = Id::from_bytes(&three_bytes);
        assert!(result.is_err(), "Expected an invalid byte length error");
    }

    #[test]
    fn test_keyset_bytes() {
        let id = Id::from_str("009a1f293253e41e").unwrap();

        let id_bytes = id.to_bytes();

        assert_eq!(id_bytes.len(), 8);

        let id_from_bytes = Id::from_bytes(&id_bytes).unwrap();

        assert_eq!(id_from_bytes, id);
    }

    #[test]
    fn test_deserialization_keys_response() {
        let keys = 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        let keys_response: KeysResponse = serde_json::from_str(keys).unwrap();

        assert_eq!(keys_response.keysets.len(), 2);
    }

    fn generate_random_id() -> Id {
        let mut rand_bytes = vec![0u8; 8];
        rand::thread_rng().fill_bytes(&mut rand_bytes[1..]);
        Id::from_bytes(&rand_bytes)
            .unwrap_or_else(|e| panic!("Failed to create Id from {}: {e}", hex::encode(rand_bytes)))
    }

    #[test]
    fn test_id_serialization() {
        let id = generate_random_id();
        let id_str = id.to_string();

        assert!(id_str.chars().all(|c| c.is_ascii_hexdigit()));
        assert_eq!(16, id_str.len());
        assert_eq!(id_str.to_lowercase(), id_str);
    }

    #[test]
    fn test_id_deserialization() {
        let id_from_short_str = Id::from_str("00123");
        assert!(matches!(id_from_short_str, Err(Error::Length)));

        let id_from_non_hex_str = Id::from_str(&SHORT_KEYSET_ID.replace('a', "x"));
        assert!(matches!(id_from_non_hex_str, Err(Error::HexError(_))));

        let id_invalid_version = Id::from_str(&SHORT_KEYSET_ID.replace("00", "99"));
        assert!(matches!(id_invalid_version, Err(Error::UnknownVersion)));

        let id_from_uppercase = Id::from_str(&SHORT_KEYSET_ID.to_uppercase());
        assert!(id_from_uppercase.is_ok());
    }
}