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implement Signer for rsa
Signed-off-by: Arthur Gautier <[email protected]>
1 parent 148cd25 commit 2cc63f4

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‎tss-esapi/src/abstraction/mod.rs‎

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@@ -14,6 +14,8 @@ mod signatures;
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mod signer;
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pub use hashing::AssociatedHashingAlgorithm;
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pub use signer::EcSigner;
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#[cfg(feature = "rsa")]
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pub use signer::{RsaPkcsSigner, RsaPssSigner};
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use std::convert::TryFrom;
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‎tss-esapi/src/abstraction/signer.rs‎

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@@ -327,3 +327,290 @@ where
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const SIGNATURE_ALGORITHM_IDENTIFIER: AlgorithmIdentifier<Self::Params> =
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Signature::<C>::ALGORITHM_IDENTIFIER;
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}
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#[cfg(feature = "rsa")]
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mod rsa {
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use super::TpmSigner;
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use crate::{
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abstraction::{signer::KeyParams, AssociatedHashingAlgorithm},
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structures::{Digest as TpmDigest, RsaScheme},
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Error, WrapperErrorKind,
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};
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use std::fmt;
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use digest::{Digest, FixedOutput, Output};
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use log::error;
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use pkcs8::AssociatedOid;
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use signature::{DigestSigner, Error as SigError, Keypair, Signer};
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use x509_cert::{
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der::asn1::AnyRef,
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spki::{
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self, AlgorithmIdentifier, AlgorithmIdentifierOwned, AssociatedAlgorithmIdentifier,
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DynSignatureAlgorithmIdentifier, SignatureAlgorithmIdentifier,
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},
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};
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use ::rsa::{pkcs1v15, pss, RsaPublicKey};
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/// [`RsaPkcsSigner`] will sign a payload with an RSA secret key stored on the TPM.
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///
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/// ```no_run
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/// # use std::sync::Mutex;
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/// # use tss_esapi::{
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/// # abstraction::{RsaPkcsSigner, transient::{TransientKeyContextBuilder, KeyParams}},
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/// # interface_types::{algorithm::{HashingAlgorithm, RsaSchemeAlgorithm}, key_bits::RsaKeyBits},
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/// # structures::{RsaExponent, RsaScheme},
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/// # TctiNameConf
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/// # };
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/// use signature::Signer;
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/// #
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/// # // Create context
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/// # let mut context = TransientKeyContextBuilder::new()
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/// # .with_tcti(
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/// # TctiNameConf::from_environment_variable().expect("Failed to get TCTI"),
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/// # )
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/// # .build()
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/// # .expect("Failed to create Context");
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///
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/// let key_params = KeyParams::Rsa {
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/// size: RsaKeyBits::Rsa1024,
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/// scheme: RsaScheme::create(RsaSchemeAlgorithm::RsaSsa, Some(HashingAlgorithm::Sha256))
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/// .expect("Failed to create RSA scheme"),
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/// pub_exponent: RsaExponent::default(),
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/// };
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/// let (tpm_km, _tpm_auth) = context
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/// .create_key(key_params, 0)
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/// .expect("Failed to create a private keypair");
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///
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/// let signer = RsaPkcsSigner::<_, sha2::Sha256>::new((Mutex::new(&mut context), tpm_km, key_params, None))
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/// .expect("Failed to create a signer");
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/// let signature = signer.sign(b"Hello Bob, Alice here.");
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/// ```
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#[derive(Debug)]
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pub struct RsaPkcsSigner<Ctx, D>
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where
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D: Digest,
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{
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context: Ctx,
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verifying_key: pkcs1v15::VerifyingKey<D>,
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}
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impl<Ctx, D> RsaPkcsSigner<Ctx, D>
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where
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Ctx: TpmSigner,
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D: Digest + AssociatedOid + AssociatedHashingAlgorithm + fmt::Debug,
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{
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pub fn new(context: Ctx) -> Result<Self, Error> {
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match context.key_params()? {
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KeyParams::Rsa {
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scheme: RsaScheme::RsaSsa(hash),
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..
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} if hash.hashing_algorithm() == D::TPM_DIGEST => {}
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other => {
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error!(
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"Unsupported key parameters: {other:?}, expected RsaSsa({:?})",
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D::new()
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);
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return Err(Error::local_error(WrapperErrorKind::InvalidParam));
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}
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}
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let public_key = context.public()?;
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let public_key = RsaPublicKey::try_from(&public_key)?;
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let verifying_key = pkcs1v15::VerifyingKey::new(public_key);
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Ok(Self {
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context,
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verifying_key,
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})
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}
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}
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impl<Ctx, D> Keypair for RsaPkcsSigner<Ctx, D>
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where
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D: Digest,
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{
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type VerifyingKey = pkcs1v15::VerifyingKey<D>;
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fn verifying_key(&self) -> Self::VerifyingKey {
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self.verifying_key.clone()
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}
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}
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impl<Ctx, D> DigestSigner<D, pkcs1v15::Signature> for RsaPkcsSigner<Ctx, D>
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where
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D: Digest + FixedOutput,
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D: AssociatedHashingAlgorithm,
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TpmDigest: From<Output<D>>,
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Ctx: TpmSigner,
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{
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fn try_sign_digest(&self, digest: D) -> Result<pkcs1v15::Signature, SigError> {
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let digest = TpmDigest::from(digest.finalize_fixed());
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//let key_params = Self::key_params::<D>();
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let signature = self.context.sign(digest).map_err(SigError::from_source)?;
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let signature =
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pkcs1v15::Signature::try_from(signature).map_err(SigError::from_source)?;
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Ok(signature)
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}
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}
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impl<Ctx, D> Signer<pkcs1v15::Signature> for RsaPkcsSigner<Ctx, D>
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where
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D: Digest + FixedOutput,
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D: AssociatedHashingAlgorithm,
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TpmDigest: From<Output<D>>,
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Ctx: TpmSigner,
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{
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fn try_sign(&self, msg: &[u8]) -> Result<pkcs1v15::Signature, SigError> {
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let mut d = D::new();
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Digest::update(&mut d, msg);
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self.try_sign_digest(d)
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}
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}
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impl<Ctx, D> SignatureAlgorithmIdentifier for RsaPkcsSigner<Ctx, D>
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where
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D: Digest + pkcs1v15::RsaSignatureAssociatedOid,
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{
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type Params = AnyRef<'static>;
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const SIGNATURE_ALGORITHM_IDENTIFIER: AlgorithmIdentifier<Self::Params> =
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pkcs1v15::SigningKey::<D>::ALGORITHM_IDENTIFIER;
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}
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/// [`RsaPssSigner`] will sign a payload with an RSA secret key stored on the TPM.
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///
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/// ```no_run
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/// # use std::sync::Mutex;
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/// # use tss_esapi::{
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/// # abstraction::{RsaPssSigner, transient::{TransientKeyContextBuilder, KeyParams}},
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/// # interface_types::{algorithm::{HashingAlgorithm, RsaSchemeAlgorithm}, key_bits::RsaKeyBits},
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/// # structures::{RsaExponent, RsaScheme},
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/// # TctiNameConf
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/// # };
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/// use signature::Signer;
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/// #
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/// # // Create context
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/// # let mut context = TransientKeyContextBuilder::new()
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/// # .with_tcti(
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/// # TctiNameConf::from_environment_variable().expect("Failed to get TCTI"),
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/// # )
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/// # .build()
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/// # .expect("Failed to create Context");
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///
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/// let key_params = KeyParams::Rsa {
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/// size: RsaKeyBits::Rsa1024,
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/// scheme: RsaScheme::create(RsaSchemeAlgorithm::RsaPss, Some(HashingAlgorithm::Sha256))
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/// .expect("Failed to create RSA scheme"),
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/// pub_exponent: RsaExponent::default(),
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/// };
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/// let (tpm_km, _tpm_auth) = context
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/// .create_key(key_params, 0)
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/// .expect("Failed to create a private keypair");
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///
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/// let signer = RsaPssSigner::<_, sha2::Sha256>::new((Mutex::new(&mut context), tpm_km, key_params, None))
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/// .expect("Failed to create a signer");
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/// let signature = signer.sign(b"Hello Bob, Alice here.");
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/// ```
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#[derive(Debug)]
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pub struct RsaPssSigner<Ctx, D>
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where
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D: Digest,
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{
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context: Ctx,
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verifying_key: pss::VerifyingKey<D>,
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}
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impl<Ctx, D> RsaPssSigner<Ctx, D>
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where
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Ctx: TpmSigner,
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D: Digest + AssociatedHashingAlgorithm + fmt::Debug,
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{
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pub fn new(context: Ctx) -> Result<Self, Error> {
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match context.key_params()? {
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KeyParams::Rsa {
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scheme: RsaScheme::RsaPss(hash),
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..
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} if hash.hashing_algorithm() == D::TPM_DIGEST => {}
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other => {
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error!(
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"Unsupported key parameters: {other:?}, expected RsaSsa({:?})",
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D::new()
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);
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return Err(Error::local_error(WrapperErrorKind::InvalidParam));
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}
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}
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let public_key = context.public()?;
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let public_key = RsaPublicKey::try_from(&public_key)?;
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let verifying_key = pss::VerifyingKey::new(public_key);
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Ok(Self {
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context,
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verifying_key,
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})
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}
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}
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impl<Ctx, D> Keypair for RsaPssSigner<Ctx, D>
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where
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D: Digest,
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{
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type VerifyingKey = pss::VerifyingKey<D>;
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fn verifying_key(&self) -> Self::VerifyingKey {
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self.verifying_key.clone()
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}
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}
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impl<Ctx, D> DigestSigner<D, pss::Signature> for RsaPssSigner<Ctx, D>
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where
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D: Digest + FixedOutput,
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D: AssociatedHashingAlgorithm,
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TpmDigest: From<Output<D>>,
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Ctx: TpmSigner,
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{
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fn try_sign_digest(&self, digest: D) -> Result<pss::Signature, SigError> {
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let digest = TpmDigest::from(digest.finalize_fixed());
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let signature = self.context.sign(digest).map_err(SigError::from_source)?;
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let signature = pss::Signature::try_from(signature).map_err(SigError::from_source)?;
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Ok(signature)
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}
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}
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impl<Ctx, D> Signer<pss::Signature> for RsaPssSigner<Ctx, D>
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where
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D: Digest + FixedOutput,
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D: AssociatedHashingAlgorithm,
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TpmDigest: From<Output<D>>,
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Ctx: TpmSigner,
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{
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fn try_sign(&self, msg: &[u8]) -> Result<pss::Signature, SigError> {
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let mut d = D::new();
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Digest::update(&mut d, msg);
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self.try_sign_digest(d)
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}
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}
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impl<Ctx, D> DynSignatureAlgorithmIdentifier for RsaPssSigner<Ctx, D>
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where
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D: Digest + AssociatedOid,
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{
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fn signature_algorithm_identifier(&self) -> spki::Result<AlgorithmIdentifierOwned> {
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pss::get_default_pss_signature_algo_id::<D>()
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}
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}
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}
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#[cfg(feature = "rsa")]
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pub use self::rsa::{RsaPkcsSigner, RsaPssSigner};

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