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    <p>I was surprised there's nothing apparent out there for this. I got curious and implemented a way to decode <code>authorized_keys</code> files. This depends on Apache Commons Codec for Base64 decoding.</p> <pre><code>import java.io.File; import java.math.BigInteger; import java.security.KeyFactory; import java.security.PublicKey; import java.security.spec.DSAPublicKeySpec; import java.security.spec.RSAPublicKeySpec; import java.util.Scanner; import org.apache.commons.codec.binary.Base64; public class AuthorizedKeysDecoder { private byte[] bytes; private int pos; public PublicKey decodePublicKey(String keyLine) throws Exception { bytes = null; pos = 0; // 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")) { bytes = Base64.decodeBase64(part); break; } } if (bytes == null) { throw new IllegalArgumentException("no Base64 part to decode"); } String type = decodeType(); if (type.equals("ssh-rsa")) { BigInteger e = decodeBigInt(); BigInteger m = decodeBigInt(); RSAPublicKeySpec spec = new RSAPublicKeySpec(m, e); return KeyFactory.getInstance("RSA").generatePublic(spec); } else if (type.equals("ssh-dss")) { BigInteger p = decodeBigInt(); BigInteger q = decodeBigInt(); BigInteger g = decodeBigInt(); BigInteger y = decodeBigInt(); DSAPublicKeySpec spec = new DSAPublicKeySpec(y, p, q, g); return KeyFactory.getInstance("DSA").generatePublic(spec); } else { throw new IllegalArgumentException("unknown type " + type); } } private String decodeType() { int len = decodeInt(); String type = new String(bytes, pos, len); pos += len; return type; } private int decodeInt() { return ((bytes[pos++] &amp; 0xFF) &lt;&lt; 24) | ((bytes[pos++] &amp; 0xFF) &lt;&lt; 16) | ((bytes[pos++] &amp; 0xFF) &lt;&lt; 8) | (bytes[pos++] &amp; 0xFF); } private BigInteger decodeBigInt() { int len = decodeInt(); byte[] bigIntBytes = new byte[len]; System.arraycopy(bytes, pos, bigIntBytes, 0, len); pos += len; return new BigInteger(bigIntBytes); } public static void main(String[] args) throws Exception { AuthorizedKeysDecoder decoder = new AuthorizedKeysDecoder(); File file = new File("authorized_keys"); Scanner scanner = new Scanner(file).useDelimiter("\n"); while (scanner.hasNext()) { System.out.println(decoder.decodePublicKey(scanner.next())); } scanner.close(); } } </code></pre>
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    1. USWhiteFang34
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      1. VTUpMod
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    1. COThere's no need to add the commons library as a dependency just for that. Take a look at DatatypeConverter#parseBase64Binary http://docs.oracle.com/javase/7/docs/api/javax/xml/bind/DatatypeConverter.html#parseBase64Binary(java.lang.String)
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    2. COThanks, man! Saved me hours of work.
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