diff options
Diffstat (limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/affirmation/LinkedIdentity.java')
-rw-r--r-- | OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/affirmation/LinkedIdentity.java | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/affirmation/LinkedIdentity.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/affirmation/LinkedIdentity.java new file mode 100644 index 000000000..dcbaa1c1c --- /dev/null +++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/affirmation/LinkedIdentity.java @@ -0,0 +1,160 @@ +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"; + } + +} |