ml-dsa: implement spki

ml-dsa/Cargo.toml

@@ -15,14 +15,17 @@ categories = ["cryptography"]
 keywords = ["crypto", "signature"]
 
 [features]
-default = ["std", "rand_core"]
-std = ["sha3/std"]
+default = ["std", "rand_core", "alloc"]
+std = ["alloc", "sha3/std"]
 zeroize = ["dep:zeroize", "hybrid-array/zeroize"]
 rand_core = ["dep:rand_core", "signature/rand_core"]
+alloc = ["pkcs8/alloc"]
 
 [dependencies]
+const-oid = { version = "0.10.0-rc.1", features = ["db"] }
 hybrid-array = { version = "0.2.3", features = ["extra-sizes"] }
 num-traits = "0.2.19"
+pkcs8 = { version = "=0.11.0-rc.1", default-features = false }
 rand_core = { version = "0.6.4", optional = true }
 sha3 = "0.10.8"
 signature = "2.3.0-pre.4"
@@ -32,6 +35,7 @@ zeroize = { version = "1.8.1", optional = true, default-features = false }
 criterion = "0.5.1"
 hex = { version = "0.4.3", features = ["serde"] }
 hex-literal = "0.4.1"
+pkcs8 = { version = "=0.11.0-rc.1", features = ["pem"] }
 rand = "0.8.5"
 serde = { version = "1.0.215", features = ["derive"] }
 serde_json = "1.0.132"

ml-dsa/src/lib.rs

@@ -41,6 +41,7 @@ mod util;
 // TODO(RLB) Move module to an independent crate shared with ml_kem
 mod module_lattice;
 
+use const_oid::db::fips204;
 use core::convert::{AsRef, TryFrom, TryInto};
 use hybrid_array::{
     typenum::{
@@ -49,13 +50,31 @@ use hybrid_array::{
     },
     Array,
 };
+use pkcs8::{
+    der::AnyRef,
+    spki::{
+        AlgorithmIdentifier, AssociatedAlgorithmIdentifier, SignatureAlgorithmIdentifier,
+        SubjectPublicKeyInfoRef,
+    },
+    AlgorithmIdentifierRef, PrivateKeyInfoRef,
+};
 
 #[cfg(feature = "rand_core")]
 use rand_core::CryptoRngCore;
 
 #[cfg(feature = "zeroize")]
 use zeroize::{Zeroize, ZeroizeOnDrop};
 
+#[cfg(feature = "alloc")]
+use pkcs8::{
+    der::{
+        self,
+        asn1::{BitString, BitStringRef},
+    },
+    spki::{self, SignatureBitStringEncoding, SubjectPublicKeyInfo},
+    EncodePublicKey,
+};
+
 use crate::algebra::{AlgebraExt, Elem, NttMatrix, NttVector, Truncate, Vector};
 use crate::crypto::H;
 use crate::hint::Hint;
@@ -124,6 +143,22 @@ impl<P: MlDsaParams> signature::SignatureEncoding for Signature<P> {
     type Repr = EncodedSignature<P>;
 }
 
+#[cfg(feature = "alloc")]
+impl<P: MlDsaParams> SignatureBitStringEncoding for Signature<P> {
+    fn to_bitstring(&self) -> der::Result<BitString> {
+        BitString::new(0, self.encode().to_vec())
+    }
+}
+
+impl<P: MlDsaParams> AssociatedAlgorithmIdentifier for Signature<P> {
+    type Params = AnyRef<'static>;
+
+    const ALGORITHM_IDENTIFIER: AlgorithmIdentifierRef<'static> = AlgorithmIdentifierRef {
+        oid: P::ALGORITHM_OID,
+        parameters: None,
+    };
+}
+
 // This method takes a slice of slices so that we can accommodate the varying calculations (direct
 // for test vectors, 0... for sign/sign_deterministic, 1... for the pre-hashed version) without
 // having to allocate memory for components.
@@ -156,6 +191,23 @@ impl<P: MlDsaParams> signature::KeypairRef for KeyPair<P> {
     type VerifyingKey = VerifyingKey<P>;
 }
 
+impl<P> TryFrom<PrivateKeyInfoRef<'_>> for KeyPair<P>
+where
+    P: MlDsaParams,
+{
+    type Error = pkcs8::Error;
+
+    fn try_from(private_key_info: pkcs8::PrivateKeyInfoRef<'_>) -> pkcs8::Result<Self> {
+        private_key_info
+            .algorithm
+            .assert_algorithm_oid(P::ALGORITHM_OID)?;
+
+        let seed = Array::try_from(private_key_info.private_key.as_bytes())
+            .map_err(|_| pkcs8::Error::KeyMalformed)?;
+        Ok(P::key_gen_internal(&seed))
+    }
+}
+
 /// An ML-DSA signing key
 #[derive(Clone, PartialEq)]
 pub struct SigningKey<P: MlDsaParams> {
@@ -384,8 +436,34 @@ impl<P: MlDsaParams> signature::RandomizedSigner<Signature<P>> for SigningKey<P>
     }
 }
 
+impl<P: MlDsaParams> SignatureAlgorithmIdentifier for SigningKey<P> {
+    type Params = AnyRef<'static>;
+
+    const SIGNATURE_ALGORITHM_IDENTIFIER: AlgorithmIdentifier<Self::Params> =
+        Signature::<P>::ALGORITHM_IDENTIFIER;
+}
+
+impl<P> TryFrom<PrivateKeyInfoRef<'_>> for SigningKey<P>
+where
+    P: MlDsaParams,
+{
+    type Error = pkcs8::Error;
+
+    fn try_from(private_key_info: pkcs8::PrivateKeyInfoRef<'_>) -> pkcs8::Result<Self> {
+        private_key_info
+            .algorithm
+            .assert_algorithm_oid(P::ALGORITHM_OID)?;
+
+        let seed = Array::try_from(private_key_info.private_key.as_bytes())
+            .map_err(|_| pkcs8::Error::KeyMalformed)?;
+        let keypair = P::key_gen_internal(&seed);
+
+        Ok(keypair.signing_key)
+    }
+}
+
 /// An ML-DSA verification key
-#[derive(Clone, PartialEq)]
+#[derive(Clone, Debug, PartialEq)]
 pub struct VerifyingKey<P: ParameterSet> {
     rho: B32,
     t1: Vector<P::K>,
@@ -488,6 +566,49 @@ impl<P: MlDsaParams> signature::Verifier<Signature<P>> for VerifyingKey<P> {
     }
 }
 
+impl<P: MlDsaParams> SignatureAlgorithmIdentifier for VerifyingKey<P> {
+    type Params = AnyRef<'static>;
+
+    const SIGNATURE_ALGORITHM_IDENTIFIER: AlgorithmIdentifier<Self::Params> =
+        Signature::<P>::ALGORITHM_IDENTIFIER;
+}
+
+#[cfg(feature = "alloc")]
+impl<P: MlDsaParams> EncodePublicKey for VerifyingKey<P> {
+    fn to_public_key_der(&self) -> spki::Result<der::Document> {
+        let algorithm_identifier = AlgorithmIdentifierRef {
+            oid: P::ALGORITHM_OID,
+            parameters: None,
+        };
+
+        let public_key = self.encode();
+        let subject_public_key = BitStringRef::new(0, &public_key)?;
+
+        SubjectPublicKeyInfo {
+            algorithm: algorithm_identifier,
+            subject_public_key,
+        }
+        .try_into()
+    }
+}
+
+impl<P: MlDsaParams> TryFrom<SubjectPublicKeyInfoRef<'_>> for VerifyingKey<P> {
+    type Error = spki::Error;
+
+    fn try_from(spki: SubjectPublicKeyInfoRef<'_>) -> spki::Result<Self> {
+        spki.algorithm.assert_algorithm_oid(P::ALGORITHM_OID)?;
+
+        Ok(Self::decode(
+            &EncodedVerifyingKey::<P>::try_from(
+                spki.subject_public_key
+                    .as_bytes()
+                    .ok_or_else(|| der::Tag::BitString.value_error())?,
+            )
+            .map_err(|_| pkcs8::Error::KeyMalformed)?,
+        ))
+    }
+}
+
 /// `MlDsa44` is the parameter set for security category 2.
 #[derive(Default, Clone, Debug, PartialEq)]
 pub struct MlDsa44;
@@ -503,6 +624,7 @@ impl ParameterSet for MlDsa44 {
     type Lambda = U32;
     type Omega = U80;
     const TAU: usize = 39;
+    const ALGORITHM_OID: pkcs8::ObjectIdentifier = fips204::ID_ML_DSA_44;
 }
 
 /// `MlDsa65` is the parameter set for security category 3.
@@ -520,6 +642,7 @@ impl ParameterSet for MlDsa65 {
     type Lambda = U48;
     type Omega = U55;
     const TAU: usize = 49;
+    const ALGORITHM_OID: pkcs8::ObjectIdentifier = fips204::ID_ML_DSA_65;
 }
 
 /// `MlKem87` is the parameter set for security category 5.
@@ -537,6 +660,7 @@ impl ParameterSet for MlDsa87 {
     type Lambda = U64;
     type Omega = U75;
     const TAU: usize = 60;
+    const ALGORITHM_OID: pkcs8::ObjectIdentifier = fips204::ID_ML_DSA_87;
 }
 
 /// A parameter set that knows how to generate key pairs

ml-dsa/src/param.rs

@@ -113,6 +113,9 @@ pub trait ParameterSet {
     #[allow(clippy::as_conversions)]
     #[allow(clippy::cast_possible_truncation)]
     const BETA: u32 = (Self::TAU as u32) * Self::Eta::U32;
+
+    /// Associated OID with the Parameter
+    const ALGORITHM_OID: pkcs8::ObjectIdentifier;
 }
 
 pub trait SigningKeyParams: ParameterSet {

ml-dsa/tests/examples/ML-DSA-44.priv

@@ -0,0 +1,4 @@
+-----BEGIN PRIVATE KEY-----
+MDICAQAwCwYJYIZIAWUDBAMRBCAAAQIDBAUGBwgJCgsMDQ4PEBESExQVFhcYGRob
+HB0eHw==
+-----END PRIVATE KEY-----

ml-dsa/tests/examples/ML-DSA-44.pub

@@ -0,0 +1,30 @@
+-----BEGIN PUBLIC KEY-----
+MIIFMjALBglghkgBZQMEAxEDggUhANeytHJUquDbReeTDUqY0sl9jxOX0Xidr6Fw
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+-----END PUBLIC KEY-----

ml-dsa/tests/examples/ML-DSA-65.priv

@@ -0,0 +1,4 @@
+-----BEGIN PRIVATE KEY-----
+MDICAQAwCwYJYIZIAWUDBAMSBCAAAQIDBAUGBwgJCgsMDQ4PEBESExQVFhcYGRob
+HB0eHw==
+-----END PRIVATE KEY-----

ml-dsa/tests/examples/ML-DSA-65.pub

@@ -0,0 +1,44 @@
+-----BEGIN PUBLIC KEY-----
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+-----END PUBLIC KEY-----

ml-dsa/tests/examples/ML-DSA-87.priv

@@ -0,0 +1,4 @@
+-----BEGIN PRIVATE KEY-----
+MDICAQAwCwYJYIZIAWUDBAMTBCAAAQIDBAUGBwgJCgsMDQ4PEBESExQVFhcYGRob
+HB0eHw==
+-----END PRIVATE KEY-----

ml-dsa/tests/examples/ML-DSA-87.pub

@@ -0,0 +1,57 @@
+-----BEGIN PUBLIC KEY-----
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+-----END PUBLIC KEY-----

ml-dsa/tests/examples/README.md

@@ -0,0 +1 @@
+Examples found in this directory can be found in https://github.com/lamps-wg/dilithium-certificates/tree/main/examples