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package de.gultsch.chat.crypto;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import org.openintents.openpgp.OpenPgpError;
import org.openintents.openpgp.OpenPgpSignatureResult;
import org.openintents.openpgp.util.OpenPgpApi;
import org.openintents.openpgp.util.OpenPgpConstants;
import android.app.PendingIntent;
import android.os.Bundle;
import android.util.Log;
public class PgpEngine {
private OpenPgpApi api;
public PgpEngine(OpenPgpApi api) {
this.api = api;
}
public String decrypt(String message) throws UserInputRequiredException,
OpenPgpException {
InputStream is = new ByteArrayInputStream(message.getBytes());
ByteArrayOutputStream os = new ByteArrayOutputStream();
Bundle result = api.decryptAndVerify(is, os);
switch (result.getInt(OpenPgpConstants.RESULT_CODE)) {
case OpenPgpConstants.RESULT_CODE_SUCCESS:
return os.toString();
case OpenPgpConstants.RESULT_CODE_USER_INTERACTION_REQUIRED:
throw new UserInputRequiredException(
(PendingIntent) result
.getParcelable(OpenPgpConstants.RESULT_INTENT));
case OpenPgpConstants.RESULT_CODE_ERROR:
throw new OpenPgpException(
(OpenPgpError) result
.getParcelable(OpenPgpConstants.RESULT_ERRORS));
default:
return null;
}
}
public String encrypt(long keyId, String message) {
Bundle params = new Bundle();
params.putBoolean(OpenPgpConstants.PARAMS_REQUEST_ASCII_ARMOR, true);
long[] keyIds = { keyId };
params.putLongArray(OpenPgpConstants.PARAMS_KEY_IDS, keyIds);
InputStream is = new ByteArrayInputStream(message.getBytes());
ByteArrayOutputStream os = new ByteArrayOutputStream();
Bundle result = api.encrypt(params, is, os);
StringBuilder encryptedMessageBody = new StringBuilder();
String[] lines = os.toString().split("\n");
for (int i = 3; i < lines.length - 1; ++i) {
encryptedMessageBody.append(lines[i].trim());
}
return encryptedMessageBody.toString();
}
public long fetchKeyId(String status, String signature)
throws OpenPgpException {
StringBuilder pgpSig = new StringBuilder();
pgpSig.append("-----BEGIN PGP SIGNED MESSAGE-----");
pgpSig.append('\n');
pgpSig.append("Hash: SHA1");
pgpSig.append('\n');
pgpSig.append('\n');
pgpSig.append(status);
pgpSig.append('\n');
pgpSig.append("-----BEGIN PGP SIGNATURE-----");
pgpSig.append('\n');
pgpSig.append('\n');
pgpSig.append(signature.replace("\n", "").trim());
pgpSig.append('\n');
pgpSig.append("-----END PGP SIGNATURE-----");
Bundle params = new Bundle();
params.putBoolean(OpenPgpConstants.PARAMS_REQUEST_ASCII_ARMOR, true);
InputStream is = new ByteArrayInputStream(pgpSig.toString().getBytes());
ByteArrayOutputStream os = new ByteArrayOutputStream();
Bundle result = api.decryptAndVerify(params, is, os);
switch (result.getInt(OpenPgpConstants.RESULT_CODE)) {
case OpenPgpConstants.RESULT_CODE_SUCCESS:
OpenPgpSignatureResult sigResult = result
.getParcelable(OpenPgpConstants.RESULT_SIGNATURE);
return sigResult.getKeyId();
case OpenPgpConstants.RESULT_CODE_USER_INTERACTION_REQUIRED:
break;
case OpenPgpConstants.RESULT_CODE_ERROR:
throw new OpenPgpException(
(OpenPgpError) result
.getParcelable(OpenPgpConstants.RESULT_ERRORS));
}
return 0;
}
public String generateSignature(String status)
throws UserInputRequiredException {
Bundle params = new Bundle();
params.putBoolean(OpenPgpConstants.PARAMS_REQUEST_ASCII_ARMOR, true);
InputStream is = new ByteArrayInputStream(status.getBytes());
ByteArrayOutputStream os = new ByteArrayOutputStream();
Bundle result = api.sign(params, is, os);
StringBuilder signatureBuilder = new StringBuilder();
switch (result.getInt(OpenPgpConstants.RESULT_CODE)) {
case OpenPgpConstants.RESULT_CODE_SUCCESS:
String[] lines = os.toString().split("\n");
for (int i = 7; i < lines.length - 1; ++i) {
signatureBuilder.append(lines[i].trim());
}
break;
case OpenPgpConstants.RESULT_CODE_USER_INTERACTION_REQUIRED:
UserInputRequiredException exception = new UserInputRequiredException(
(PendingIntent) result
.getParcelable(OpenPgpConstants.RESULT_INTENT));
throw exception;
case OpenPgpConstants.RESULT_CODE_ERROR:
break;
}
return signatureBuilder.toString();
}
public class UserInputRequiredException extends Exception {
private static final long serialVersionUID = -6913480043269132016L;
private PendingIntent pi;
public UserInputRequiredException(PendingIntent pi) {
this.pi = pi;
}
public PendingIntent getPendingIntent() {
return this.pi;
}
}
public class OpenPgpException extends Exception {
private static final long serialVersionUID = -7324789703473056077L;
private OpenPgpError error;
public OpenPgpException(OpenPgpError openPgpError) {
this.error = openPgpError;
}
public OpenPgpError getOpenPgpError() {
return this.error;
}
}
}
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