ecdsa: implement key import

Signed-off-by: Arthur Gautier <baloo@superbaloo.net>

Author: baloo

Cargo.lock

@@ -27,6 +27,7 @@ x509-cert = "0.2.4"
 thiserror = "1.0"
 
 [dev-dependencies]
+rand = "0.8.5"
 serial_test = "0.5.1"
 testresult = "0.2.0"
 x509-cert = { version = "0.2.4", features = ["builder"] }

cryptoki-rustcrypto/Cargo.toml

@@ -6,18 +6,21 @@ use cryptoki::{
     object::{Attribute, AttributeType, KeyType, ObjectClass, ObjectHandle},
 };
 use der::{
-    asn1::{ObjectIdentifier, OctetStringRef},
+    asn1::{ObjectIdentifier, OctetString, OctetStringRef},
     oid::AssociatedOid,
     AnyRef, Decode, Encode,
 };
 use ecdsa::{
     elliptic_curve::{
         generic_array::ArrayLength,
+        ops::Invert,
+        point::PointCompression,
         sec1::{FromEncodedPoint, ModulusSize, ToEncodedPoint},
-        AffinePoint, CurveArithmetic, FieldBytesSize, PublicKey,
+        subtle::CtOption,
+        AffinePoint, CurveArithmetic, FieldBytesSize, PublicKey, Scalar,
     },
-    hazmat::DigestPrimitive,
-    PrimeCurve, Signature, VerifyingKey,
+    hazmat::{DigestPrimitive, SignPrimitive},
+    PrimeCurve, Signature, SignatureSize, SigningKey, VerifyingKey,
 };
 use signature::{digest::Digest, DigestSigner};
 use spki::{
@@ -27,7 +30,7 @@ use spki::{
 use std::{convert::TryFrom, ops::Add};
 use thiserror::Error;
 
-use crate::SessionLike;
+use crate::{CryptokiImport, SessionLike};
 
 pub fn read_key<S: SessionLike, C: SignAlgorithm>(
     session: &S,
@@ -69,6 +72,56 @@ where
     }
 }
 
+impl<C> CryptokiImport for SigningKey<C>
+where
+    C: PrimeCurve + CurveArithmetic,
+    Scalar<C>: Invert<Output = CtOption<Scalar<C>>> + SignPrimitive<C>,
+    SignatureSize<C>: ArrayLength<u8>,
+
+    C: AssociatedOid,
+{
+    fn put_key<S: SessionLike>(
+        &self,
+        session: &S,
+        template: impl Into<Vec<Attribute>>,
+    ) -> cryptoki::error::Result<ObjectHandle> {
+        let mut template = template.into();
+        template.push(Attribute::Class(ObjectClass::PRIVATE_KEY));
+        template.push(Attribute::KeyType(KeyType::EC));
+        template.push(Attribute::EcParams(C::OID.to_der().unwrap()));
+        template.push(Attribute::Value(self.to_bytes().as_slice().to_vec()));
+
+        let handle = session.create_object(&template)?;
+
+        Ok(handle)
+    }
+}
+
+impl<C> CryptokiImport for VerifyingKey<C>
+where
+    C: PrimeCurve + CurveArithmetic + PointCompression,
+    AffinePoint<C>: FromEncodedPoint<C> + ToEncodedPoint<C>,
+    FieldBytesSize<C>: ModulusSize,
+    C: AssociatedOid,
+{
+    fn put_key<S: SessionLike>(
+        &self,
+        session: &S,
+        template: impl Into<Vec<Attribute>>,
+    ) -> cryptoki::error::Result<ObjectHandle> {
+        let mut template = template.into();
+        template.push(Attribute::Class(ObjectClass::PUBLIC_KEY));
+        template.push(Attribute::KeyType(KeyType::EC));
+        template.push(Attribute::EcParams(C::OID.to_der().unwrap()));
+        let ec_point = OctetString::new(self.to_sec1_bytes()).unwrap();
+        template.push(Attribute::EcPoint(ec_point.to_der().unwrap()));
+
+        let handle = session.create_object(&template)?;
+
+        Ok(handle)
+    }
+}
+
 #[derive(Error, Debug)]
 pub enum Error {
     #[error("Cryptoki error: {0}")]
@@ -118,8 +171,6 @@ where
     pub fn new(session: S, label: &[u8]) -> Result<Self, Error> {
         // First we'll lookup a private key with that label.
         let template = vec![
-            Attribute::Token(true),
-            Attribute::Private(true),
             Attribute::Label(label.to_vec()),
             Attribute::Class(ObjectClass::PRIVATE_KEY),
             Attribute::KeyType(KeyType::EC),

cryptoki-rustcrypto/src/ecdsa.rs

@@ -68,3 +68,11 @@ impl<'s> SessionLike for &'s Session {
         Session::generate_random_slice(self, random_data)
     }
 }
+
+pub trait CryptokiImport {
+    fn put_key<S: SessionLike>(
+        &self,
+        session: &S,
+        template: impl Into<Vec<Attribute>>,
+    ) -> Result<ObjectHandle>;
+}

cryptoki-rustcrypto/src/lib.rs

@@ -11,7 +11,7 @@ use cryptoki::{
     session::UserType,
     types::AuthPin,
 };
-use cryptoki_rustcrypto::ecdsa;
+use cryptoki_rustcrypto::{ecdsa, CryptokiImport};
 use der::Encode;
 use p256::pkcs8::AssociatedOid;
 use serial_test::serial;
@@ -39,7 +39,7 @@ fn sign_verify() -> TestResult {
 
     // pub key template
     let pub_key_template = vec![
-        Attribute::Token(true),
+        Attribute::Token(false),
         Attribute::Private(false),
         Attribute::KeyType(KeyType::EC),
         Attribute::Verify(true),
@@ -49,7 +49,7 @@ fn sign_verify() -> TestResult {
 
     // priv key template
     let priv_key_template = vec![
-        Attribute::Token(true),
+        Attribute::Token(false),
         Attribute::Private(true),
         Attribute::Sign(true),
         Attribute::Label(label.to_vec()),
@@ -76,3 +76,42 @@ fn sign_verify() -> TestResult {
 
     Ok(())
 }
+
+#[test]
+#[serial]
+fn test_import() -> TestResult {
+    let (pkcs11, slot) = init_pins();
+
+    // open a session
+    let session = pkcs11.open_rw_session(slot)?;
+
+    // log in the session
+    session.login(UserType::User, Some(&AuthPin::new(USER_PIN.into())))?;
+
+    let mut rng = rand::thread_rng();
+    let private = p256::ecdsa::SigningKey::random(&mut rng);
+
+    let label = b"demo-import";
+
+    let template = vec![Attribute::Token(false), Attribute::Label(label.to_vec())];
+
+    let private_handle = private.put_key(&session, template.clone())?;
+    let public_handle = private.verifying_key().put_key(&session, template)?;
+
+    // data to sign
+    let data = [0xFF, 0x55, 0xDD];
+
+    let signer =
+        ecdsa::Signer::<p256::NistP256, _>::new(&session, label).expect("Lookup keys from HSM");
+
+    let signature: p256::ecdsa::Signature = signer.sign(&data);
+
+    let verifying_key = private.verifying_key();
+    verifying_key.verify(&data, &signature)?;
+
+    // delete keys
+    session.destroy_object(private_handle)?;
+    session.destroy_object(public_handle)?;
+
+    Ok(())
+}