First implementation

src/main/groovy/io/kamax/mxisd/key/KeyManager.groovy

@@ -0,0 +1,107 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2017 Maxime Dor
+ *
+ * https://max.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.key
+
+import io.kamax.mxisd.config.KeyConfig
+import net.i2p.crypto.eddsa.EdDSAEngine
+import net.i2p.crypto.eddsa.EdDSAPrivateKey
+import net.i2p.crypto.eddsa.EdDSAPublicKey
+import net.i2p.crypto.eddsa.KeyPairGenerator
+import net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable
+import net.i2p.crypto.eddsa.spec.EdDSAParameterSpec
+import net.i2p.crypto.eddsa.spec.EdDSAPrivateKeySpec
+import net.i2p.crypto.eddsa.spec.EdDSAPublicKeySpec
+import org.apache.commons.io.FileUtils
+import org.springframework.beans.factory.InitializingBean
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.stereotype.Component
+
+import java.nio.charset.StandardCharsets
+import java.nio.file.Files
+import java.nio.file.Path
+import java.nio.file.Paths
+import java.security.KeyPair
+import java.security.MessageDigest
+import java.security.PrivateKey
+import java.security.PublicKey
+
+@Component
+class KeyManager implements InitializingBean {
+
+    @Autowired
+    private KeyConfig keyCfg
+
+    private EdDSAParameterSpec keySpecs
+    private EdDSAEngine signEngine
+    private List<KeyPair> keys
+
+    @Override
+    void afterPropertiesSet() throws Exception {
+        keySpecs = EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.CURVE_ED25519_SHA512)
+        signEngine = new EdDSAEngine(MessageDigest.getInstance(keySpecs.getHashAlgorithm()))
+        keys = new ArrayList<>()
+
+        Path privKey = Paths.get(keyCfg.getPath())
+
+        if (!Files.exists(privKey)) {
+            KeyPair pair = (new KeyPairGenerator()).generateKeyPair()
+            String keyEncoded = Base64.getEncoder().encodeToString(pair.getPrivate().getEncoded())
+            FileUtils.writeStringToFile(privKey.toFile(), keyEncoded, StandardCharsets.ISO_8859_1)
+            keys.add(pair)
+        } else {
+            if (Files.isDirectory(privKey)) {
+                throw new RuntimeException("Invalid path for private key: ${privKey.toString()}")
+            }
+
+            if (Files.isReadable(privKey)) {
+                byte[] seed = Base64.getDecoder().decode(FileUtils.readFileToString(privKey.toFile(), StandardCharsets.ISO_8859_1))
+                EdDSAPrivateKeySpec privKeySpec = new EdDSAPrivateKeySpec(seed, keySpecs)
+                EdDSAPublicKeySpec pubKeySpec = new EdDSAPublicKeySpec(privKeySpec.getA(), keySpecs)
+                keys.add(new KeyPair(new EdDSAPublicKey(pubKeySpec), new EdDSAPrivateKey(privKeySpec)))
+            }
+        }
+    }
+
+    int getCurrentIndex() {
+        return 0
+    }
+
+    KeyPair getKeys(int index) {
+        return keys.get(index)
+    }
+
+    PrivateKey getPrivateKey(int index) {
+        return getKeys(index).getPrivate()
+    }
+
+    PublicKey getPublicKey(int index) {
+        return getKeys(index).getPublic()
+    }
+
+    EdDSAParameterSpec getSpecs() {
+        return keySpecs
+    }
+
+    String getPublicKeyBase64(int index) {
+        return Base64.getEncoder().encodeToString(getPublicKey(index).getEncoded())
+    }
+
+}