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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.openpgp;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.bouncycastle.util.encoders.Hex;

public class PGPSessionKey
{
    private final int algorithm;
    private final byte[] sessionKey;

    public PGPSessionKey(int algorithm, byte[] sessionKey)
    {
        this.algorithm = algorithm;
        this.sessionKey = sessionKey;
    }

    public int getAlgorithm()
    {
        return algorithm;
    }

    public byte[] getKey()
    {
        byte[] copy = new byte[sessionKey.length];
        System.arraycopy(sessionKey, 0, copy, 0, sessionKey.length);
        return copy;
    }

    @SuppressWarnings("ArrayToString")
    public String toString()
    {
        // mote: we only print the reference to sessionKey to prevent accidental disclosure of the actual key value.
        return algorithm + ":" + sessionKey;
    }

    public static PGPSessionKey fromAsciiRepresentation(String ascii)
    {
        Pattern pattern = Pattern.compile("(\\d{1,3}):([0-9A-Fa-f]+)");
        Matcher matcher = pattern.matcher(ascii);
        if (!matcher.matches())
        {
            throw new IllegalArgumentException("Provided ascii encoding does not match expected format :");
        }
        String alg = matcher.group(1);
        String hexKey = matcher.group(2);

        return new PGPSessionKey(Integer.parseInt(alg), Hex.decode(hexKey));
    }
}