Add ECDSA Sig type

Author: Adrian Cruceru

src/oid.rs

@@ -14,6 +14,7 @@ lazy_static! {
     // PKCS #1
     pub static ref rsaEncryption: ObjectIdentifier = vec![1, 2, 840, 113549, 1, 1, 1].into();
     pub static ref sha256WithRSAEncryption: ObjectIdentifier = vec![1, 2, 840, 113549, 1, 1, 11].into();
+    pub static ref sha256WithECDSAEncryption: ObjectIdentifier = vec![1, 2, 840, 10045, 4, 3, 2].into();
 
     // X.500 attribute types
     pub static ref commonName: ObjectIdentifier = vec![2, 5, 4, 3].into();

src/types.rs

@@ -54,6 +54,35 @@ impl BERDecodable for RsaPkcs15<Sha256> {
     }
 }
 
+pub struct EcdsaPkcs15<H>(pub H);
+
+impl<H> SignatureAlgorithm for EcdsaPkcs15<H> {}
+
+/// sha256WithECDSAEncryption
+impl DerWrite for EcdsaPkcs15<Sha256> {
+    fn write(&self, writer: DERWriter) {
+        writer.write_sequence(|writer| {
+            writer.next().write_oid(&oid::sha256WithECDSAEncryption);
+            writer.next().write_null();
+        })
+    }
+}
+
+impl BERDecodable for EcdsaPkcs15<Sha256> {
+    fn decode_ber<'a, 'b>(reader: BERReader<'a, 'b>) -> ASN1Result<Self> {
+        reader.read_sequence(|seq_reader| {
+            let oid = ObjectIdentifier::decode_ber(seq_reader.next())?;
+            seq_reader.next().read_null()?;
+            if oid == *oid::sha256WithECDSAEncryption {
+                Ok(EcdsaPkcs15(Sha256))
+            } else {
+                Err(ASN1Error::new(ASN1ErrorKind::Invalid))
+            }
+        })
+    }
+}
+
+
 #[derive(Clone, Debug, Eq, PartialEq, Hash)]
 pub struct Name {
     // The actual ASN.1 type is Vec<HashSet<(ObjectIdentifier, TaggedDerValue)>>.