heddle-crypto 0.3.1

An AI-native version control system
Documentation 
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// SPDX-License-Identifier: Apache-2.0
//! RSA signature implementation.

use pkcs8::{DecodePrivateKey, DecodePublicKey, EncodePublicKey};
use rsa::{
    Pkcs1v15Sign, RsaPrivateKey, RsaPublicKey, pkcs1::DecodeRsaPrivateKey, rand_core::OsRng,
};
use sha2::{Digest, Sha256};

use crate::{Signer, SignerError};

/// RSA signer.
pub struct RsaSigner {
    private_key: RsaPrivateKey,
    public_key: RsaPublicKey,
    cached_public_key_pem: Vec<u8>,
}

impl RsaSigner {
    fn from_key_pair(
        private_key: RsaPrivateKey,
        public_key: RsaPublicKey,
    ) -> Result<Self, SignerError> {
        let cached_public_key_pem = public_key
            .to_public_key_pem(pkcs8::LineEnding::LF)
            .map_err(|e| SignerError::Pkcs8(e.to_string()))?
            .into_bytes();
        Ok(Self {
            private_key,
            public_key,
            cached_public_key_pem,
        })
    }

    pub fn generate(key_size: usize) -> Result<Self, SignerError> {
        let private_key = RsaPrivateKey::new(&mut OsRng, key_size)
            .map_err(|e| SignerError::Rsa(e.to_string()))?;
        let public_key = private_key.to_public_key();
        Self::from_key_pair(private_key, public_key)
    }

    pub fn from_pem(pem: &str) -> Result<Self, SignerError> {
        use crate::pem_loader::{PemKind, classify_pem};

        let private_key =
            match classify_pem(pem) {
                PemKind::Pkcs1Rsa => RsaPrivateKey::from_pkcs1_pem(pem)
                    .map_err(|e| SignerError::Rsa(e.to_string()))?,
                PemKind::Pkcs8 => RsaPrivateKey::from_pkcs8_pem(pem)
                    .map_err(|e| SignerError::Pkcs8(e.to_string()))?,
                _ => return Err(SignerError::UnknownKeyFormat),
            };

        let public_key = private_key.to_public_key();
        Self::from_key_pair(private_key, public_key)
    }

    pub fn to_pem(&self) -> Result<String, SignerError> {
        use pkcs8::EncodePrivateKey;

        self.private_key
            .to_pkcs8_pem(pkcs8::LineEnding::LF)
            .map(|pem| pem.to_string())
            .map_err(|e| SignerError::Pkcs8(e.to_string()))
    }

    pub fn public_key_to_pem(&self) -> Result<String, SignerError> {
        self.public_key
            .to_public_key_pem(pkcs8::LineEnding::LF)
            .map_err(|e| SignerError::Pkcs8(e.to_string()))
    }

    pub fn verify_with_public_key(
        data: &[u8],
        public_key_pem: &[u8],
        signature: &[u8],
    ) -> Result<(), SignerError> {
        let public_key_str = std::str::from_utf8(public_key_pem)
            .map_err(|e| SignerError::InvalidPublicKey(e.to_string()))?;
        let public_key = RsaPublicKey::from_public_key_pem(public_key_str)
            .map_err(|e| SignerError::InvalidPublicKey(e.to_string()))?;
        let hash = Sha256::digest(data);
        public_key
            .verify(Pkcs1v15Sign::new::<Sha256>(), &hash, signature)
            .map_err(|_| SignerError::VerificationFailed)
    }
}

impl Signer for RsaSigner {
    fn algorithm(&self) -> &'static str {
        "rsa"
    }

    fn public_key(&self) -> &[u8] {
        &self.cached_public_key_pem
    }

    fn sign(&self, data: &[u8]) -> Result<Vec<u8>, SignerError> {
        let hash = Sha256::digest(data);
        self.private_key
            .sign(Pkcs1v15Sign::new::<Sha256>(), &hash)
            .map_err(|e| SignerError::Rsa(e.to_string()))
    }

    fn verify(&self, data: &[u8], signature: &[u8]) -> Result<(), SignerError> {
        let hash = Sha256::digest(data);
        self.public_key
            .verify(Pkcs1v15Sign::new::<Sha256>(), &hash, signature)
            .map_err(|_| SignerError::VerificationFailed)
    }
}