hbkr-rs 0.3.2

Hashblock Key Rotation
Documentation 
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//! hbkr Basic type

use std::str::FromStr;

use crate::{
    basicpre::BasicPrefix, derivation::DerivationCode, errors::KrError, key_manage::Publickey,
};

#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum Basic {
    ED25519,
    PASTA,
}

impl Basic {
    pub fn derive(&self, public_key: Publickey) -> BasicPrefix {
        BasicPrefix::new(*self, public_key)
    }
}

impl DerivationCode for Basic {
    fn to_str(&self) -> String {
        match self {
            Self::ED25519 => "D",
            Self::PASTA => "1AAE",
        }
        .into()
    }

    fn code_len(&self) -> usize {
        match self {
            Self::ED25519 => 1,
            Self::PASTA => 4,
        }
    }

    fn derivative_b64_len(&self) -> usize {
        match self {
            Self::ED25519 | Self::PASTA => 43,
        }
    }
}

impl FromStr for Basic {
    type Err = KrError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s
            .get(..1)
            .ok_or_else(|| KrError::DeserializeError("Empty prefix".into()))?
        {
            "D" => Ok(Self::ED25519),
            "1" => match &s[1..4] {
                "AAE" => Ok(Self::PASTA),
                _ => Err(KrError::DeserializeError("Unknown signature code".into())),
            },
            _ => Err(KrError::DeserializeError("Unknown prefix code".into())),
        }
    }
}