cashu 0.16.0

Cashu shared types and crypto utilities, used as the foundation for the CDK and their crates
Documentation
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//! 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;
#[cfg(feature = "mint")]
use std::collections::BTreeMap;

#[cfg(feature = "mint")]
use bitcoin::bip32::{ChildNumber, DerivationPath, Xpriv};
use bitcoin::hashes::sha256::Hash as Sha256;
use bitcoin::hashes::Hash;
#[cfg(feature = "mint")]
use bitcoin::key::Secp256k1;
#[cfg(feature = "mint")]
use bitcoin::secp256k1;
use serde::{Deserialize, Deserializer, Serialize};
use serde_with::{serde_as, VecSkipError};
use thiserror::Error;

use super::nut01::Keys;
#[cfg(feature = "mint")]
use super::nut01::{MintKeyPair, MintKeys};
use crate::nuts::nut00::CurrencyUnit;
use crate::util::hex;
use crate::{ensure_cdk, 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, expected 8 bytes (short/v1) or 33 bytes (v2)")]
    Length,
    /// Unknown version
    #[error("NUT02: Unknown Version")]
    UnknownVersion,
    /// Keyset id does not match
    #[error("Keyset id incorrect")]
    IncorrectKeysetId,
    /// Short keyset id does not match any of the provided IDv2s
    #[error("Short keyset id does not match any of the provided IDv2s")]
    UnknownShortKeysetId,
    /// Short keyset id is ill-formed
    #[error("Short keyset id is ill-formed")]
    MalformedShortKeysetId,
    /// 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 {
    /// Version 00
    Version00,
    /// Version 01
    Version01,
}

impl KeySetVersion {
    /// [`KeySetVersion`] to byte
    pub fn to_byte(&self) -> u8 {
        match self {
            Self::Version00 => 0,
            Self::Version01 => 1,
        }
    }

    /// [`KeySetVersion`] from byte
    pub fn from_byte(byte: &u8) -> Result<Self, Error> {
        match byte {
            0 => Ok(Self::Version00),
            1 => Ok(Self::Version01),
            _ => Err(Error::UnknownVersion),
        }
    }

    /// [`KeySetVersion`] from proto value
    pub fn from_proto_i32(value: i32) -> Result<Self, Error> {
        match value {
            1 => Ok(Self::Version00),
            2 => Ok(Self::Version01),
            _ => Err(Error::UnknownVersion),
        }
    }

    /// [`KeySetVersion`] to proto value
    pub fn to_proto_i32(&self) -> i32 {
        match self {
            Self::Version00 => 1,
            Self::Version01 => 2,
        }
    }
}

impl fmt::Display for KeySetVersion {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            KeySetVersion::Version00 => f.write_str("00"),
            KeySetVersion::Version01 => f.write_str("01"),
        }
    }
}

/// Keyset ID bytes
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
pub enum IdBytes {
    /// Bytes for v1
    V1([u8; 7]),
    /// Bytes for v2
    V2([u8; 32]),
}

impl IdBytes {
    /// Convert [`IdBytes`] to [`Vec<u8>`]
    pub fn to_vec(&self) -> Vec<u8> {
        match self {
            IdBytes::V1(bytes) => bytes.to_vec(),
            IdBytes::V2(bytes) => bytes.to_vec(),
        }
    }
}

/// 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(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
#[serde(into = "String", try_from = "String")]
#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
pub struct Id {
    version: KeySetVersion,
    id: IdBytes,
}

impl Id {
    const STRLEN_V1: usize = 14;
    const BYTELEN_V1: usize = 7;
    const STRLEN_V2: usize = 64;
    const BYTELEN_V2: usize = 32;

    /// [`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> {
        let version = KeySetVersion::from_byte(&bytes[0])?;
        let id = match version {
            KeySetVersion::Version00 => IdBytes::V1(bytes[1..].try_into()?),
            KeySetVersion::Version01 => IdBytes::V2(bytes[1..].try_into()?),
        };
        Ok(Self { version, id })
    }

    /// Get the version of the keyset
    pub fn get_version(&self) -> KeySetVersion {
        self.version
    }

    /// *** V2 KEYSET ***
    /// create [`Id`] v2 from keys, unit and (optionally) expiry
    /// 1 - sort public keys by their amount in ascending order
    /// 2 - concatenate all public keys to one byte array
    /// 3 - concatenate the lowercase unit string to the byte array (e.g. "unit:sat")
    /// 4 - If a final expiration is specified, convert it into a radix-10 string and concatenate it (e.g "final_expiry:1896187313")
    /// 5 - HASH_SHA256 the concatenated byte array and take the first 31 bytes
    /// 6 - prefix it with a keyset ID version byte
    ///
    /// # Panics
    ///
    /// This function will not panic under normal circumstances as the hash output
    /// is always valid hex and the correct length.
    pub fn v2_from_data(
        map: &Keys,
        unit: &CurrencyUnit,
        input_fee_ppk: u64,
        expiry: Option<u64>,
    ) -> Self {
        let mut keys: Vec<(&Amount, &super::PublicKey)> = map.iter().collect();
        keys.sort_by_key(|(amt, _v)| *amt);

        let keys_string = keys
            .iter()
            .map(|(amt, pubkey)| format!("{}:{}", amt, hex::encode(pubkey.to_bytes())))
            .collect::<Vec<String>>()
            .join(",");

        let mut data = keys_string;
        data.push_str(&format!("|unit:{}", unit));

        if input_fee_ppk > 0 {
            data.push_str(&format!("|input_fee_ppk:{}", input_fee_ppk));
        }

        if let Some(expiry) = expiry {
            if expiry > 0 {
                data.push_str(&format!("|final_expiry:{}", expiry));
            }
        }

        let hash = Sha256::hash(data.as_bytes());
        let hex_of_hash = hex::encode(hash.to_byte_array());

        Self {
            version: KeySetVersion::Version01,
            id: IdBytes::V2(
                hex::decode(&hex_of_hash[0..Self::STRLEN_V2])
                    .expect("Keys hash could not be hex decoded")
                    .try_into()
                    .expect("Invalid length of hex id"),
            ),
        }
    }

    /// *** V1 VERSION ***
    /// 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
    ///
    /// # Panics
    ///
    /// This function will not panic under normal circumstances as the hash output
    /// is always valid hex and the correct length.
    pub fn v1_from_keys(map: &Keys) -> Self {
        let mut keys: Vec<(&Amount, &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: IdBytes::V1(
                hex::decode(&hex_of_hash[0..Self::STRLEN_V1])
                    .expect("Keys hash could not be hex decoded")
                    .try_into()
                    .expect("Invalid length of hex id"),
            ),
        }
    }

    /// Selects the correct IDv2 from a list of keysets and the given short-id
    /// or returns the short-id in the case of v1.
    pub fn from_short_keyset_id(
        short_id: &ShortKeysetId,
        keysets_info: &[KeySetInfo],
    ) -> Result<Self, Error> {
        // Check prefix length
        if short_id.prefix.len() < Self::BYTELEN_V1 || short_id.prefix.len() > Self::BYTELEN_V2 {
            return Err(Error::MalformedShortKeysetId);
        }

        match short_id.version {
            KeySetVersion::Version00 => {
                let mut idbytes: [u8; Self::BYTELEN_V1] = [0u8; Self::BYTELEN_V1];
                idbytes.copy_from_slice(&short_id.prefix[..Self::BYTELEN_V1]);
                Ok(Self {
                    version: short_id.version,
                    id: IdBytes::V1(idbytes),
                })
            }
            KeySetVersion::Version01 => {
                // We return the first match or error
                for keyset_info in keysets_info.iter() {
                    if keyset_info.id.id.to_vec()[..short_id.prefix.len()] == short_id.prefix {
                        return Ok(keyset_info.id);
                    }
                }
                Err(Error::UnknownShortKeysetId)
            }
        }
    }
}

// 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 id_bytes = value.to_bytes();
        let mut hex_bytes: [u8; 8] = [0; 8];
        hex_bytes.copy_from_slice(&id_bytes[..8]);

        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 {
        let hex_id = match self.id {
            IdBytes::V1(id) => hex::encode(id),
            IdBytes::V2(id) => hex::encode(id),
        };
        f.write_str(&format!("{}{}", self.version, hex_id))
    }
}

impl fmt::Debug for Id {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let hex_id = match self.id {
            IdBytes::V1(id) => hex::encode(id),
            IdBytes::V2(id) => hex::encode(id),
        };
        f.write_str(&format!("{}{}", self.version, hex_id))
    }
}

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

    fn try_from(s: String) -> Result<Self, Self::Error> {
        // Check that string is ASCII (required for hex) to avoid panics on byte slicing
        // with multi-byte UTF-8 characters
        ensure_cdk!(
            s.is_ascii(),
            Error::HexError(hex::Error::InvalidHexCharacter {
                c: s.chars().find(|c| !c.is_ascii()).unwrap_or('\0'),
                index: s.chars().position(|c| !c.is_ascii()).unwrap_or(0),
            })
        );

        ensure_cdk!(
            s.len() == Self::STRLEN_V1 + 2 || s.len() == Self::STRLEN_V2 + 2,
            Error::Length
        );

        let version: KeySetVersion = KeySetVersion::from_byte(&hex::decode(&s[..2])?[0])?;
        let id = match version {
            KeySetVersion::Version00 => IdBytes::V1(
                hex::decode(&s[2..])?
                    .try_into()
                    .map_err(|_| Error::Length)?,
            ),
            KeySetVersion::Version01 => IdBytes::V2(
                hex::decode(&s[2..])?
                    .try_into()
                    .map_err(|_| Error::Length)?,
            ),
        };

        Ok(Self { version, id })
    }
}

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()
    }
}

/// Improper prefix of the keyset ID. In case of v1, this is the whole ID.
/// In case of v2, this is the 8-byte prefix
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
#[serde(into = "String", try_from = "String")]
#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
pub struct ShortKeysetId {
    /// The version of the short keyset
    version: KeySetVersion,
    /// The improper prefix of the keyset ID bytes
    prefix: Vec<u8>,
}

impl ShortKeysetId {
    /// [`ShortKeysetId`] to bytes
    pub fn to_bytes(&self) -> Vec<u8> {
        [vec![self.version.to_byte()], self.prefix.clone()].concat()
    }

    /// [`ShortKeysetId`] from bytes
    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
        if bytes.is_empty() {
            return Err(Error::Length);
        }

        let version = KeySetVersion::from_byte(&bytes[0])?;
        let prefix = bytes[1..].to_vec();
        Ok(Self { version, prefix })
    }
}

impl From<Id> for ShortKeysetId {
    fn from(id: Id) -> Self {
        let version = id.version;
        let prefix: Vec<u8> = match id.version {
            KeySetVersion::Version00 => match id.id {
                IdBytes::V1(idbytes) => Vec::from(&idbytes),
                _ => panic!("Unexpected IdBytes length"),
            },
            KeySetVersion::Version01 => match id.id {
                IdBytes::V2(idbytes) => Vec::from(&idbytes[..7]),
                _ => panic!("Unexpected IdBytes length"),
            },
        };

        Self { version, prefix }
    }
}

impl fmt::Display for ShortKeysetId {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let hex_id = hex::encode(&self.prefix);
        f.write_str(&format!("{}{}", self.version, hex_id))
    }
}

impl fmt::Debug for ShortKeysetId {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let hex_id = hex::encode(&self.prefix);
        f.write_str(&format!("{}{}", self.version, hex_id))
    }
}

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

    fn try_from(s: String) -> Result<Self, Self::Error> {
        // Check that string is ASCII (required for hex) to avoid panics on byte slicing
        // with multi-byte UTF-8 characters
        ensure_cdk!(
            s.is_ascii(),
            Error::HexError(hex::Error::InvalidHexCharacter {
                c: s.chars().find(|c| !c.is_ascii()).unwrap_or('\0'),
                index: s.chars().position(|c| !c.is_ascii()).unwrap_or(0),
            })
        );

        ensure_cdk!(s.len() == 16, Error::Length);

        let version: KeySetVersion = KeySetVersion::from_byte(&hex::decode(&s[..2])?[0])?;
        let prefix = hex::decode(&s[2..])?;

        Ok(Self { version, prefix })
    }
}

impl FromStr for ShortKeysetId {
    type Err = Error;

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

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

/// 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`]
    #[cfg_attr(feature = "swagger", schema(value_type = String))]
    pub id: Id,
    /// Keyset [`CurrencyUnit`]
    pub unit: CurrencyUnit,
    /// Keyset state - indicates whether the mint will sign new outputs with this keyset
    #[serde(skip_serializing_if = "Option::is_none")]
    pub active: Option<bool>,
    /// Keyset [`Keys`]
    pub keys: Keys,
    /// Input Fee PPK
    #[serde(default)]
    pub input_fee_ppk: u64,
    /// Expiry
    #[serde(skip_serializing_if = "Option::is_none")]
    pub final_expiry: Option<u64>,
}

impl KeySet {
    /// Verify the keyset id matches keys
    pub fn verify_id(&self) -> Result<(), Error> {
        let keys_id = match self.id.version {
            KeySetVersion::Version00 => Id::v1_from_keys(&self.keys),
            KeySetVersion::Version01 => Id::v2_from_data(
                &self.keys,
                &self.unit,
                self.input_fee_ppk,
                self.final_expiry,
            ),
        };

        ensure_cdk!(
            u32::from(keys_id) == u32::from(self.id),
            Error::IncorrectKeysetId
        );

        ensure_cdk!(keys_id == self.id, Error::IncorrectKeysetId);

        Ok(())
    }
}

/// KeySetInfo
#[derive(Debug, Clone, Hash, PartialEq, Eq, Deserialize, Serialize)]
#[cfg_attr(feature = "swagger", derive(utoipa::ToSchema))]
pub struct KeySetInfo {
    /// Keyset [`Id`]
    #[cfg_attr(feature = "swagger", schema(value_type = String))]
    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(
        deserialize_with = "deserialize_input_fee_ppk",
        default = "default_input_fee_ppk"
    )]
    pub input_fee_ppk: u64,
    /// Expiry of the keyset
    #[serde(skip_serializing_if = "Option::is_none")]
    pub final_expiry: Option<u64>,
}

/// List of [KeySetInfo]
pub type KeySetInfos = Vec<KeySetInfo>;

/// Utility methods for [KeySetInfos]
pub trait KeySetInfosMethods {
    /// Filter for active keysets
    fn active(&self) -> impl Iterator<Item = &KeySetInfo> + '_;

    /// Filter keysets for specific unit
    fn unit(&self, unit: CurrencyUnit) -> impl Iterator<Item = &KeySetInfo> + '_;
}

impl KeySetInfosMethods for KeySetInfos {
    fn active(&self) -> impl Iterator<Item = &KeySetInfo> + '_ {
        self.iter().filter(|k| k.active)
    }

    fn unit(&self, unit: CurrencyUnit) -> impl Iterator<Item = &KeySetInfo> + '_ {
        self.iter().filter(move |k| k.unit == unit)
    }
}

fn deserialize_input_fee_ppk<'de, D>(deserializer: D) -> Result<u64, D::Error>
where
    D: Deserializer<'de>,
{
    // This will either give us a u64 or null (which becomes None)
    let opt = Option::<u64>::deserialize(deserializer)?;
    Ok(opt.unwrap_or_else(default_input_fee_ppk))
}

fn default_input_fee_ppk() -> u64 {
    0
}

#[cfg(feature = "mint")]
/// 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,
    /// Input Fee PPK
    #[serde(default)]
    pub input_fee_ppk: u64,
    #[serde(skip_serializing_if = "Option::is_none")]
    /// Expiry [`Option<u64>`]
    pub final_expiry: Option<u64>,
}

#[cfg(feature = "mint")]
impl MintKeySet {
    /// Generate new [`MintKeySet`]
    ///
    /// # Panics
    ///
    /// This function will panic if the RNG fails or if key derivation fails,
    /// which should not happen under normal circumstances.
    pub fn generate<C: secp256k1::Signing>(
        secp: &Secp256k1<C>,
        xpriv: Xpriv,
        unit: CurrencyUnit,
        amounts: &[u64],
        input_fee_ppk: u64,
        final_expiry: Option<u64>,
        version: KeySetVersion,
    ) -> Self {
        let mut map = BTreeMap::new();
        for (i, amount) in amounts.iter().enumerate() {
            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.into(),
                MintKeyPair {
                    secret_key: secret_key.into(),
                    public_key: public_key.into(),
                },
            );
        }

        let keys = MintKeys::new(map);
        let id = match version {
            KeySetVersion::Version00 => Id::v1_from_keys(&keys.clone().into()),
            KeySetVersion::Version01 => {
                Id::v2_from_data(&keys.clone().into(), &unit, input_fee_ppk, final_expiry)
            }
        };
        Self {
            id,
            unit,
            keys,
            input_fee_ppk,
            final_expiry,
        }
    }

    /// Generate new [`MintKeySet`] from seed
    ///
    /// # Panics
    ///
    /// This function will panic if the RNG fails or if key derivation fails,
    /// which should not happen under normal circumstances.
    #[allow(clippy::too_many_arguments)]
    pub fn generate_from_seed<C: secp256k1::Signing>(
        secp: &Secp256k1<C>,
        seed: &[u8],
        amounts: &[u64],
        currency_unit: CurrencyUnit,
        derivation_path: DerivationPath,
        input_fee_ppk: u64,
        final_expiry: Option<u64>,
        version: KeySetVersion,
    ) -> 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,
            amounts,
            input_fee_ppk,
            final_expiry,
            version,
        )
    }

    /// Generate new [`MintKeySet`] from xpriv
    ///
    /// # Panics
    ///
    /// This function will panic if the RNG fails or if key derivation fails,
    /// which should not happen under normal circumstances.
    #[allow(clippy::too_many_arguments)]
    pub fn generate_from_xpriv<C: secp256k1::Signing>(
        secp: &Secp256k1<C>,
        xpriv: Xpriv,
        amounts: &[u64],
        currency_unit: CurrencyUnit,
        derivation_path: DerivationPath,
        input_fee_ppk: u64,
        final_expiry: Option<u64>,
        version: KeySetVersion,
    ) -> Self {
        Self::generate(
            secp,
            xpriv
                .derive_priv(secp, &derivation_path)
                .expect("RNG busted"),
            currency_unit,
            amounts,
            input_fee_ppk,
            final_expiry,
            version,
        )
    }
}

#[cfg(feature = "mint")]
impl From<MintKeySet> for Id {
    fn from(keyset: MintKeySet) -> Id {
        let keys: Keys = keyset.keys.into();
        match keyset.id.version {
            KeySetVersion::Version00 => Id::v1_from_keys(&keys),
            KeySetVersion::Version01 => Id::v2_from_data(
                &keys,
                &keyset.unit,
                keyset.input_fee_ppk,
                keyset.final_expiry,
            ),
        }
    }
}

#[cfg(feature = "mint")]
impl From<&MintKeys> for Id {
    fn from(map: &MintKeys) -> Self {
        let keys: super::Keys = map.clone().into();

        Id::v1_from_keys(&keys)
    }
}

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

    use bitcoin::secp256k1::rand::{self, RngCore};

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

    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 = Id::v1_from_keys(&keys);

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

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

        let id: Id = Id::v1_from_keys(&keys);

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

    #[test]
    fn test_v2_deserialization_and_id_generation() {
        let unit: CurrencyUnit = CurrencyUnit::from_str("sat").unwrap();
        let expiry: u64 = 2059210353; // +10 years from now
        let input_fee_ppk = 100;

        let keys: Keys = serde_json::from_str(SHORT_KEYSET).unwrap();
        let id_from_str =
            Id::from_str("015ba18a8adcd02e715a58358eb618da4a4b3791151a4bee5e968bb88406ccf76a")
                .unwrap();
        let id = Id::v2_from_data(&keys, &unit, input_fee_ppk, Some(expiry));
        assert_eq!(id, id_from_str);

        let keys: Keys = serde_json::from_str(KEYSET).unwrap();
        let id_from_str =
            Id::from_str("01ab6aa4ff30390da34986d84be5274b48ad7a74265d791095bfc39f4098d9764f")
                .unwrap();
        let id = Id::v2_from_data(&keys, &unit, 0, Some(expiry));
        assert_eq!(id, id_from_str);

        let id = Id::v2_from_data(&keys, &unit, 0, None);
        let id_from_str =
            Id::from_str("012fbb01a4e200c76df911eeba3b8fe1831202914b24664f4bccbd25852a6708f8")
                .unwrap();
        assert_eq!(id, id_from_str);
    }

    #[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();

        let h = r#"{"id":"009a1f293253e41e","unit":"sat","active":true, "input_fee_ppk":null}"#;

        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_v2_to_int() {
        let id = Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
            .unwrap();

        let id_int = u32::from(id);
        assert_eq!(2113471806, 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_keyset_version_proto_mapping() {
        assert_eq!(
            KeySetVersion::from_proto_i32(1).unwrap(),
            KeySetVersion::Version00
        );
        assert_eq!(
            KeySetVersion::from_proto_i32(2).unwrap(),
            KeySetVersion::Version01
        );
        assert!(matches!(
            KeySetVersion::from_proto_i32(0),
            Err(Error::UnknownVersion)
        ));

        assert_eq!(KeySetVersion::Version00.to_proto_i32(), 1);
        assert_eq!(KeySetVersion::Version01.to_proto_i32(), 2);
    }

    #[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(version: KeySetVersion) -> Id {
        match version {
            KeySetVersion::Version00 => {
                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))
                })
            }
            KeySetVersion::Version01 => {
                let mut rand_bytes = vec![1u8; 33];
                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(KeySetVersion::Version00);
        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_v2_serialization() {
        let id = generate_random_id(KeySetVersion::Version01);
        let id_str = id.to_string();

        assert!(id_str.chars().all(|c| c.is_ascii_hexdigit()));
        assert_eq!(66, 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());
    }

    #[test]
    fn test_short_keyset_id_from_id() {
        let idv1 = Id::from_str("009a1f293253e41e").unwrap();
        let idv2 =
            Id::from_str("01adc013fa9d85171586660abab27579888611659d357bc86bc09cb26eee8bc035")
                .unwrap();

        let short_id_1: ShortKeysetId = idv1.into();
        let short_id_2: ShortKeysetId = idv2.into();

        assert!(short_id_1.to_string() == "009a1f293253e41e");
        assert!(short_id_2.to_string() == "01adc013fa9d8517");
    }

    #[test]
    fn test_id_with_non_ascii_chars() {
        // Test that non-ASCII characters in ID strings don't cause panics
        // but instead return proper errors. This was found by fuzzing.
        // The character 'ǝ' is a 2-byte UTF-8 sequence that could cause
        // panics when slicing by byte index.
        let id_with_non_ascii = Id::from_str("0ǝfa73302d12ff{");
        assert!(matches!(id_with_non_ascii, Err(Error::HexError(_))));

        // Also test ShortKeysetId
        let short_id_with_non_ascii = ShortKeysetId::from_str("0ǝfa73302d12ff");
        assert!(matches!(short_id_with_non_ascii, Err(Error::HexError(_))));
    }
}