hbkr-rs 0.3.2

Hashblock Key Rotation
Documentation 
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use std::str::FromStr;

use crate::{derivation::DerivationCode, errors::KrError, self_signing_pre::SelfSigningPrefix};

/// Self Signing Derivations
///
/// A self signing prefix derivation outputs a signature as its derivative (2.3.5)
#[derive(Debug, PartialEq, Clone, Copy, Hash)]
pub enum SelfSigning {
    Ed25519Sha512,
    ECDSAsecp256k1Sha256,
    Ed448,
}

impl SelfSigning {
    pub fn derive(&self, sig: Vec<u8>) -> SelfSigningPrefix {
        SelfSigningPrefix::new(*self, sig)
    }
}

impl DerivationCode for SelfSigning {
    fn to_str(&self) -> String {
        match self {
            Self::Ed25519Sha512 => "0B",
            Self::ECDSAsecp256k1Sha256 => "0C",
            Self::Ed448 => "1AAE",
        }
        .into()
    }

    fn code_len(&self) -> usize {
        match self {
            Self::Ed25519Sha512 | Self::ECDSAsecp256k1Sha256 => 2,
            Self::Ed448 => 4,
        }
    }

    fn derivative_b64_len(&self) -> usize {
        match self {
            Self::Ed25519Sha512 | Self::ECDSAsecp256k1Sha256 => 86,
            Self::Ed448 => 152,
        }
    }
}

impl FromStr for SelfSigning {
    type Err = KrError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s
            .get(..1)
            .ok_or_else(|| KrError::DeserializeError("Empty prefix".into()))?
        {
            "0" => match &s[1..2] {
                "B" => Ok(Self::Ed25519Sha512),
                "C" => Ok(Self::ECDSAsecp256k1Sha256),
                _ => Err(KrError::DeserializeError(
                    "Unknown signature type code".into(),
                )),
            },
            "1" => match &s[1..4] {
                "AAE" => Ok(Self::Ed448),
                _ => Err(KrError::DeserializeError(
                    "Unknown signature type code".into(),
                )),
            },
            _ => Err(KrError::DeserializeError(format!(
                "Unknown master code: {}",
                s
            ))),
        }
    }
}