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package org.sufficientlysecure.keychain.pgp.affirmation;
import org.spongycastle.bcpg.UserAttributeSubpacket;
import org.spongycastle.util.Strings;
import org.spongycastle.util.encoders.Hex;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.util.Log;
import java.net.URI;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.Set;
public class LinkedIdentity {
protected byte[] mData;
public final String mNonce;
public final URI mSubUri;
final Set<String> mFlags;
final HashMap<String,String> mParams;
protected LinkedIdentity(byte[] data, String nonce, Set<String> flags,
HashMap<String, String> params, URI subUri) {
if ( ! nonce.matches("[0-9a-zA-Z]+")) {
throw new AssertionError("bug: nonce must be hexstring!");
}
mData = data;
mNonce = nonce;
mFlags = flags;
mParams = params;
mSubUri = subUri;
}
LinkedIdentity(String nonce, Set<String> flags,
HashMap<String, String> params, URI subUri) {
this(null, nonce, flags, params, subUri);
}
public byte[] encode() {
if (mData != null) {
return mData;
}
StringBuilder b = new StringBuilder();
b.append("pgpid:");
// add flags
if (mFlags != null) {
boolean first = true;
for (String flag : mFlags) {
if (!first) {
b.append(";");
}
first = false;
b.append(flag);
}
}
// add parameters
if (mParams != null) {
boolean first = true;
Iterator<Entry<String, String>> it = mParams.entrySet().iterator();
while (it.hasNext()) {
if (!first) {
b.append(";");
}
first = false;
Entry<String, String> entry = it.next();
b.append(entry.getKey()).append("=").append(entry.getValue());
}
}
b.append("@");
b.append(mSubUri);
byte[] nonceBytes = Hex.decode(mNonce);
byte[] data = Strings.toUTF8ByteArray(b.toString());
byte[] result = new byte[data.length+12];
System.arraycopy(nonceBytes, 0, result, 0, 12);
System.arraycopy(data, 0, result, 12, result.length);
return result;
}
/** This method parses an affirmation from a UserAttributeSubpacket, or returns null if the
* subpacket can not be parsed as a valid affirmation.
*/
public static LinkedIdentity parseAffirmation(UserAttributeSubpacket subpacket) {
if (subpacket.getType() != 100) {
return null;
}
byte[] data = subpacket.getData();
String nonce = Hex.toHexString(data, 0, 12);
try {
return parseUri(nonce, Strings.fromUTF8ByteArray(Arrays.copyOfRange(data, 12, data.length)));
} catch (IllegalArgumentException e) {
Log.e(Constants.TAG, "error parsing uri in (suspected) affirmation packet");
return null;
}
}
protected static LinkedIdentity parseUri (String nonce, String uriString) {
URI uri = URI.create(uriString);
if ("pgpid".equals(uri.getScheme())) {
Log.e(Constants.TAG, "unknown uri scheme in (suspected) affirmation packet");
return null;
}
if (!uri.isOpaque()) {
Log.e(Constants.TAG, "non-opaque uri in (suspected) affirmation packet");
return null;
}
String specific = uri.getSchemeSpecificPart();
if (!specific.contains("@")) {
Log.e(Constants.TAG, "unknown uri scheme in affirmation packet");
return null;
}
String[] pieces = specific.split("@", 2);
URI subUri = URI.create(pieces[1]);
Set<String> flags = new HashSet<String>();
HashMap<String,String> params = new HashMap<String,String>();
{
String[] rawParams = pieces[0].split(";");
for (String param : rawParams) {
String[] p = param.split("=", 2);
if (p.length == 1) {
flags.add(param);
} else {
params.put(p[0], p[1]);
}
}
}
return new LinkedIdentity(nonce, flags, params, subUri);
}
public static String generateNonce() {
// TODO make this actually random
// byte[] data = new byte[96];
// new SecureRandom().nextBytes(data);
// return Hex.toHexString(data);
// debug for now
return "0123456789ABCDEF01234567";
}
}
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