feat: revise EdDSA mechanism to support optional params

This revises the `Mechanism::Eddsa` struct to receive a `EddsaParams` struct as an optional argument.

Signed-off-by: Mete Can Eriş <[email protected]>

cryptoki/src/mechanism/eddsa.rs

@@ -0,0 +1,61 @@
+//! EdDSA mechanism types
+
+use cryptoki_sys::*;
+use std::marker::PhantomData;
+
+/// EdDSA parameters.
+///
+/// The EdDSA mechanism, denoted CKM_EDDSA, is a mechanism for
+/// single-part and multipart signatures and verification for
+/// EdDSA.  This mechanism implements the five EdDSA signature
+/// schemes defined in RFC 8032 and RFC 8410.
+///
+/// For curves according to RFC 8032, this mechanism has an
+/// optional parameter, a CK_EDDSA_PARAMS structure.
+///
+/// The absence or presence of the parameter as well as its
+/// content is used to identify which signature scheme is to be
+/// used.
+///
+/// | Signature Scheme | Mechanism Param | phFlag | Context Data |
+/// |------------------|-----------------|--------|--------------|
+/// | Ed25519          | Not Required    | N/A    | N/A          |
+/// | Ed25519ctx       | Required        | False  | Optional     |
+/// | Ed25519ph        | Required        | True   | Optional     |
+/// | Ed448            | Required        | False  | Optional     |
+/// | Ed448ph          | Required        | True   | Optional     |
+///
+/// This structure wraps a `CK_EDDSA_PARAMS` structure.
+#[derive(Copy, Debug, Clone)]
+#[repr(transparent)]
+pub struct EddsaParams<'a> {
+    inner: CK_EDDSA_PARAMS,
+    _marker: PhantomData<&'a [u8]>,
+}
+
+impl EddsaParams<'_> {
+    /// Construct EdDSA parameters.
+    ///
+    /// # Arguments
+    ///
+    /// * `params` - The CK_EDDSA_PARAMS structure.
+    pub fn new(params: CK_EDDSA_PARAMS) -> Self {
+        Self {
+            inner: params,
+            _marker: PhantomData,
+        }
+    }
+}
+
+impl Default for EddsaParams<'_> {
+    /// Provide a default instance of `EddsaParams`.
+    ///
+    /// This initializes `EddsaParams` with the default value
+    /// of the `CK_EDDSA_PARAMS` structure.
+    fn default() -> Self {
+        Self {
+            inner: CK_EDDSA_PARAMS::default(),
+            _marker: PhantomData,
+        }
+    }
+}

cryptoki/src/mechanism/mod.rs

@@ -3,6 +3,7 @@
 //! Data types for mechanisms
 
 pub mod aead;
+pub mod eddsa;
 pub mod ekdf;
 pub mod elliptic_curve;
 pub mod hkdf;
@@ -902,11 +903,16 @@ pub enum Mechanism<'a> {
     EcdsaSha512,
     /// EDDSA mechanism
     ///
+    /// This mechanism has an optional parameter, a CK_EDDSA_PARAMS
+    /// structure. The absence or presence of the parameter as well
+    /// as its content is used to identify which signature scheme
+    /// is to be used.
+    ///
     /// Note: EdDSA is not part of the PKCS#11 v2.40 standard and as
-    /// such may not be understood by the backend. It is included here
-    /// because some vendor implementations support it through the
-    /// v2.40 interface.
-    Eddsa,
+    /// such may not be understood by some backends. It is included
+    /// here because some vendor implementations support it through
+    /// the v2.40 interface.
+    Eddsa(Option<eddsa::EddsaParams<'a>>),
 
     // SHA-n
     /// SHA-1 mechanism
@@ -1001,7 +1007,7 @@ impl Mechanism<'_> {
             Mechanism::EccKeyPairGen => MechanismType::ECC_KEY_PAIR_GEN,
             Mechanism::EccEdwardsKeyPairGen => MechanismType::ECC_EDWARDS_KEY_PAIR_GEN,
             Mechanism::EccMontgomeryKeyPairGen => MechanismType::ECC_MONTGOMERY_KEY_PAIR_GEN,
-            Mechanism::Eddsa => MechanismType::EDDSA,
+            Mechanism::Eddsa(_) => MechanismType::EDDSA,
             Mechanism::Ecdh1Derive(_) => MechanismType::ECDH1_DERIVE,
             Mechanism::Ecdsa => MechanismType::ECDSA,
             Mechanism::EcdsaSha1 => MechanismType::ECDSA_SHA1,
@@ -1073,6 +1079,13 @@ impl From<&Mechanism<'_>> for CK_MECHANISM {
             | Mechanism::Sha512RsaPkcsPss(params) => make_mechanism(mechanism, params),
             Mechanism::RsaPkcsOaep(params) => make_mechanism(mechanism, params),
             Mechanism::Ecdh1Derive(params) => make_mechanism(mechanism, params),
+            Mechanism::Eddsa(params) => match params {
+                Some(params) => make_mechanism(mechanism, params),
+                None => CK_MECHANISM {
+                    mechanism,
+                    ..Default::default()
+                },
+            },
             Mechanism::HkdfDerive(params) | Mechanism::HkdfData(params) => {
                 make_mechanism(mechanism, params)
             }
@@ -1098,7 +1111,6 @@ impl From<&Mechanism<'_>> for CK_MECHANISM {
             | Mechanism::EccKeyPairGen
             | Mechanism::EccEdwardsKeyPairGen
             | Mechanism::EccMontgomeryKeyPairGen
-            | Mechanism::Eddsa
             | Mechanism::Ecdsa
             | Mechanism::EcdsaSha1
             | Mechanism::EcdsaSha224

cryptoki/tests/basic.rs

@@ -7,6 +7,7 @@ use common::init_pins;
 use cryptoki::context::Function;
 use cryptoki::error::{Error, RvError};
 use cryptoki::mechanism::aead::GcmParams;
+use cryptoki::mechanism::eddsa::EddsaParams;
 use cryptoki::mechanism::rsa::{PkcsMgfType, PkcsOaepParams, PkcsOaepSource};
 use cryptoki::mechanism::{Mechanism, MechanismType};
 use cryptoki::object::{
@@ -99,9 +100,57 @@ fn sign_verify_ed25519() -> TestResult {
 
     let data = [0xFF, 0x55, 0xDD];
 
-    let signature = session.sign(&Mechanism::Eddsa, private, &data)?;
+    let signature = session.sign(&Mechanism::Eddsa(None), private, &data)?;
 
-    session.verify(&Mechanism::Eddsa, public, &data, &signature)?;
+    session.verify(&Mechanism::Eddsa(None), public, &data, &signature)?;
+
+    session.destroy_object(public)?;
+    session.destroy_object(private)?;
+
+    Ok(())
+}
+
+#[test]
+#[serial]
+fn sign_verify_ed25519_with_eddsa_params() -> TestResult {
+    let (pkcs11, slot) = init_pins();
+
+    let session = pkcs11.open_rw_session(slot)?;
+
+    session.login(UserType::User, Some(&AuthPin::new(USER_PIN.into())))?;
+
+    let mechanism = Mechanism::EccEdwardsKeyPairGen;
+
+    let pub_key_template = vec![
+        Attribute::Token(true),
+        Attribute::Private(false),
+        Attribute::Verify(true),
+        // Ed25519 OID
+        // See: https://github.com/opendnssec/SoftHSMv2/blob/ac70dc398b236e4522101930e790008936489e2d/src/lib/test/SignVerifyTests.cpp#L173
+        Attribute::EcParams(vec![
+            0x13, 0x0c, 0x65, 0x64, 0x77, 0x61, 0x72, 0x64, 0x73, 0x32, 0x35, 0x35, 0x31, 0x39,
+        ]),
+    ];
+
+    let priv_key_template = vec![Attribute::Token(true)];
+
+    let (public, private) =
+        session.generate_key_pair(&mechanism, &pub_key_template, &priv_key_template)?;
+
+    let data = [0xFF, 0x55, 0xDD];
+
+    let signature = session.sign(
+        &Mechanism::Eddsa(Some(EddsaParams::default())),
+        private,
+        &data,
+    )?;
+
+    session.verify(
+        &Mechanism::Eddsa(Some(EddsaParams::default())),
+        public,
+        &data,
+        &signature,
+    )?;
 
     session.destroy_object(public)?;
     session.destroy_object(private)?;