package eu.siacs.conversations.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 android.app.PendingIntent; import android.content.Intent; public class PgpEngine { private OpenPgpApi api; public PgpEngine(OpenPgpApi api) { this.api = api; } public String decrypt(String message) throws UserInputRequiredException, OpenPgpException { Intent params = new Intent(); params.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY); InputStream is = new ByteArrayInputStream(message.getBytes()); ByteArrayOutputStream os = new ByteArrayOutputStream(); Intent result = api.executeApi(params, is, os); switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, 0)) { case OpenPgpApi.RESULT_CODE_SUCCESS: return os.toString(); case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED: throw new UserInputRequiredException((PendingIntent) result.getParcelableExtra(OpenPgpApi.RESULT_INTENT)); case OpenPgpApi.RESULT_CODE_ERROR: throw new OpenPgpException( (OpenPgpError) result.getParcelableExtra(OpenPgpApi.RESULT_ERROR)); default: return null; } } public String encrypt(long keyId, String message) { long[] keys = {keyId}; Intent params = new Intent(); params.setAction(OpenPgpApi.ACTION_ENCRYPT); params.putExtra(OpenPgpApi.EXTRA_KEY_IDS,keys); params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true); InputStream is = new ByteArrayInputStream(message.getBytes()); ByteArrayOutputStream os = new ByteArrayOutputStream(); Intent result = api.executeApi(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 { if (signature==null) { return 0; } if (status==null) { status=""; } StringBuilder pgpSig = new StringBuilder(); pgpSig.append("-----BEGIN PGP SIGNED MESSAGE-----"); 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-----"); Intent params = new Intent(); params.setAction(OpenPgpApi.ACTION_DECRYPT_VERIFY); params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true); InputStream is = new ByteArrayInputStream(pgpSig.toString().getBytes()); ByteArrayOutputStream os = new ByteArrayOutputStream(); Intent result = api.executeApi(params, is, os); switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, 0)) { case OpenPgpApi.RESULT_CODE_SUCCESS: OpenPgpSignatureResult sigResult = result.getParcelableExtra(OpenPgpApi.RESULT_SIGNATURE); if (sigResult==null) { return 0; } else { return sigResult.getKeyId(); } case OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED: break; case OpenPgpApi.RESULT_CODE_ERROR: throw new OpenPgpException( (OpenPgpError) result.getParcelableExtra(OpenPgpApi.RESULT_ERROR)); } return 0; } public String generateSignature(String status) throws UserInputRequiredException { Intent params = new Intent(); params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true); params.setAction(OpenPgpApi.ACTION_SIGN); InputStream is = new ByteArrayInputStream(status.getBytes()); ByteArrayOutputStream os = new ByteArrayOutputStream(); Intent result = api.executeApi(params, is, os); StringBuilder signatureBuilder = new StringBuilder(); switch (result.getIntExtra(OpenPgpApi.RESULT_CODE, 0)) { case OpenPgpApi.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 OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED: throw new UserInputRequiredException((PendingIntent) result.getParcelableExtra(OpenPgpApi.RESULT_INTENT)); case OpenPgpApi.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; } } }