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-rw-r--r--src/de/gultsch/chat/crypto/PgpEngine.java148
1 files changed, 148 insertions, 0 deletions
diff --git a/src/de/gultsch/chat/crypto/PgpEngine.java b/src/de/gultsch/chat/crypto/PgpEngine.java
new file mode 100644
index 00000000..6d94e577
--- /dev/null
+++ b/src/de/gultsch/chat/crypto/PgpEngine.java
@@ -0,0 +1,148 @@
+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;
+ }
+ }
+}