add support for EdDSA on security tokens (currently only gnuk)

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/EdDSAKeyFormat.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2017 Schürmann & Breitmoser GbR
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.securitytoken;
+
+import org.bouncycastle.asn1.ASN1ObjectIdentifier;
+import org.bouncycastle.asn1.nist.NISTNamedCurves;
+import org.bouncycastle.asn1.x9.X9ECParameters;
+import org.bouncycastle.bcpg.sig.KeyFlags;
+import org.bouncycastle.math.ec.ECCurve;
+import org.sufficientlysecure.keychain.service.SaveKeyringParcel;
+import org.sufficientlysecure.keychain.service.SaveKeyringParcel.SubkeyAdd;
+
+
+// 4.3.3.6 Algorithm Attributes
+public class EdDSAKeyFormat extends KeyFormat {
+
+    public EdDSAKeyFormat() {
+        super(KeyFormatType.EdDSAKeyFormatType);
+    }
+
+    @Override
+    public void addToSaveKeyringParcel(SaveKeyringParcel.Builder builder, int keyFlags) {
+        builder.addSubkeyAdd(SubkeyAdd.createSubkeyAdd(SaveKeyringParcel.Algorithm.EDDSA,
+                null, null, keyFlags, 0L));
+    }
+}

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/KeyFormat.java

@@ -27,7 +27,8 @@ public abstract class KeyFormat {
 
     public enum KeyFormatType {
         RSAKeyFormatType,
-        ECKeyFormatType
+        ECKeyFormatType,
+        EdDSAKeyFormatType
     }
 
     private final KeyFormatType mKeyFormatType;
@@ -53,7 +54,7 @@ public abstract class KeyFormat {
             case PublicKeyAlgorithmTags.ECDH:
             case PublicKeyAlgorithmTags.ECDSA:
                 if (bytes.length < 2) {
-                    throw new IllegalArgumentException("Bad length for RSA attributes");
+                    throw new IllegalArgumentException("Bad length for EC attributes");
                 }
                 int len = bytes.length - 1;
                 if (bytes[bytes.length - 1] == (byte)0xff) {
@@ -65,6 +66,8 @@ public abstract class KeyFormat {
                 System.arraycopy(bytes, 1, boid, 2, len);
                 final ASN1ObjectIdentifier oid = ASN1ObjectIdentifier.getInstance(boid);
                 return new ECKeyFormat(oid, ECKeyFormat.ECAlgorithmFormat.from(bytes[0], bytes[bytes.length - 1]));
+            case PublicKeyAlgorithmTags.EDDSA:
+                return new EdDSAKeyFormat();
 
             default:
                 throw new IllegalArgumentException("Unsupported Algorithm id " + bytes[0]);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/operations/SecurityTokenPsoSignTokenOp.java

@@ -108,6 +108,7 @@ public class SecurityTokenPsoSignTokenOp {
                 data = prepareDsi(hash, hashAlgo);
                 break;
             case ECKeyFormatType:
+            case EdDSAKeyFormatType:
                 data = hash;
                 break;
             default:
@@ -128,7 +129,7 @@ public class SecurityTokenPsoSignTokenOp {
                 }
                 break;
 
-            case ECKeyFormatType:
+            case ECKeyFormatType: {
                 // "plain" encoding, see https://github.com/open-keychain/open-keychain/issues/2108
                 if (signature.length % 2 != 0) {
                     throw new IOException("Bad signature length!");
@@ -146,6 +147,10 @@ public class SecurityTokenPsoSignTokenOp {
                 signature = baos.toByteArray();
                 break;
             }
+
+            case EdDSAKeyFormatType:
+                break;
+        }
         return signature;
     }
 

OpenKeychain/src/test/java/org/sufficientlysecure/keychain/ArmoredInputStreamTest.java

@@ -4,6 +4,7 @@ package org.sufficientlysecure.keychain;
 import java.io.InputStream;
 
 import org.bouncycastle.bcpg.ArmoredInputStream;
+import org.bouncycastle.util.encoders.Hex;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.sufficientlysecure.keychain.pgp.UncachedKeyringTest;