Github user ahgittin commented on a diff in the pull request:
https://github.com/apache/incubator-brooklyn/pull/465#discussion_r23526368
--- Diff:
utils/common/src/main/java/brooklyn/util/crypto/AuthorizedKeysParser.java ---
@@ -0,0 +1,132 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package brooklyn.util.crypto;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.math.BigInteger;
+import java.security.KeyFactory;
+import java.security.PublicKey;
+import java.security.interfaces.DSAPublicKey;
+import java.security.interfaces.RSAPublicKey;
+import java.security.spec.DSAPublicKeySpec;
+import java.security.spec.RSAPublicKeySpec;
+
+import brooklyn.util.exceptions.Exceptions;
+
+import com.google.common.io.BaseEncoding;
+
+public class AuthorizedKeysParser {
+
+ public static PublicKey decodePublicKey(String keyLine) {
+ try {
+ ByteArrayInputStream stream = null;
+
+ // look for the Base64 encoded part of the line to decode
+ // both ssh-rsa and ssh-dss begin with "AAAA" due to the
length bytes
+ for (String part : keyLine.split(" ")) {
+ if (part.startsWith("AAAA")) {
+ stream = new
ByteArrayInputStream(BaseEncoding.base64().decode(part));
+ break;
+ }
+ }
+ if (stream == null)
+ throw new IllegalArgumentException("Encoded public key
should include phrase beginning AAAA.");
+
+ String type = readType(stream);
+ if (type.equals("ssh-rsa")) {
+ BigInteger e = readBigInt(stream);
+ BigInteger m = readBigInt(stream);
+ RSAPublicKeySpec spec = new RSAPublicKeySpec(m, e);
+ return KeyFactory.getInstance("RSA").generatePublic(spec);
+ } else if (type.equals("ssh-dss")) {
+ BigInteger p = readBigInt(stream);
+ BigInteger q = readBigInt(stream);
+ BigInteger g = readBigInt(stream);
+ BigInteger y = readBigInt(stream);
+ DSAPublicKeySpec spec = new DSAPublicKeySpec(y, p, q, g);
+ return KeyFactory.getInstance("DSA").generatePublic(spec);
+ } else {
+ throw new IllegalArgumentException("Unknown public key
type " + type);
+ }
+
+ } catch (Exception e) {
+ Exceptions.propagateIfFatal(e);
+ throw new IllegalArgumentException("Error parsing
authorized_keys/SSH2 format public key: "+e);
+ }
+ }
+
+ private static int readInt(InputStream stream) throws IOException {
+ return ((stream.read() & 0xFF) << 24) | ((stream.read() & 0xFF) <<
16)
+ | ((stream.read() & 0xFF) << 8) | (stream.read() & 0xFF);
+ }
+
+ private static byte[] readBytesWithLength(InputStream stream) throws
IOException {
+ int len = readInt(stream);
+ byte[] result = new byte[len];
+ stream.read(result);
+ return result;
+ }
+
+ private static void writeInt(OutputStream stream, int v) throws
IOException {
+ for (int shift = 24; shift >= 0; shift -= 8)
+ stream.write((v >>> shift) & 0xFF);
+ }
+ private static void writeBytesWithLength(OutputStream stream, byte[]
buf) throws IOException {
+ writeInt(stream, buf.length);
+ stream.write(buf);
+ }
+
+ private static String readType(InputStream stream) throws IOException
{ return new String(readBytesWithLength(stream)); }
+ private static BigInteger readBigInt(InputStream stream) throws
IOException { return new BigInteger(readBytesWithLength(stream)); }
+
+ public static String encodePublicKey(PublicKey key) {
--- End diff --
i spent a while looking and didn't find one
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