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The BSD License Copyright (c) 2010-2012 RIPE NCC All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of the RIPE NCC nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 package net.ripe.rpki.commons.crypto.util;
 
 
 
 public final class KeyPairUtil {
 
     private KeyPairUtil() {
         // Utility classes should not have a public or default constructor.
     }

    
Get Base64 encoded public key as string. Primarily for generating filenames and transferring public keys across the wire.. Not fit for decoding: strips the trailing '=' characters!
 
     public static String getEncodedKeyIdentifier(PublicKey key) {
         String encoded = base64UrlEncode(getKeyIdentifier(key));
         return StringUtils.stripEnd(encoded"="); // No need to decode, so we can strip padding.
     }

    
Get ASCII Hex encoded hash of the public key; for use in certificate subjects as described here: http://tools.ietf.org/html/draft-ietf-sidr-res-certs-21#section-8
 
     public static String getAsciiHexEncodedPublicKeyHash(PublicKey publicKey) {
         return hexEncodeHashData(getKeyIdentifier(publicKey));
     }
 
     static String hexEncodeHashData(byte[] keyHashData) {
         HexEncoder hexEncoder = new HexEncoder();
         ByteArrayOutputStream out = new ByteArrayOutputStream();
         try {
             hexEncoder.encode(keyHashData, 0, keyHashData.lengthout);
             out.flush();
             return out.toString();
         } catch (IOException e) {
             throw new IllegalArgumentException("Exception hex encoding data"e);
         }
     }
 
     public static byte[] getKeyIdentifier(PublicKey key) {
         try {
             return new JcaX509ExtensionUtils().createSubjectKeyIdentifier(key).getKeyIdentifier();
         } catch (NoSuchAlgorithmException e) {
             throw new IllegalArgumentException("Could not get SubjectKeyIdentifierStructure from key"e);
         }
     }
 
     public static String base64UrlEncode(byte[] data) {
         ByteArrayOutputStream out = new ByteArrayOutputStream();
         try {
             new FileSystemSafeBase64UrlEncoder().encode(data, 0, data.length,
                     out);
             out.flush();
             return out.toString();
         } catch (IOException e) {
             throw new IllegalArgumentException(
                     "Exception when base64url encoding data"e);
         }
     }

    

See also:
Base 64 Encoding with URL and Filename Safe Alphabet
    public static class FileSystemSafeBase64UrlEncoder extends Base64Encoder {
        public FileSystemSafeBase64UrlEncoder() {
            [. - 2] = (byte'-';
            [. - 1] = (byte'_';
            initialiseDecodingTable();
        }
    }
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