public byte[] getTimeStampToken(byte[] digest)
throws NoSuchAlgorithmException, UnsupportedEncodingException, TSPException {
TimeStampRequestGenerator tsqGenerator = new TimeStampRequestGenerator();
tsqGenerator.setCertReq(true);
if (tsaOid != null) tsqGenerator.setReqPolicy(tsaOid);
TimeStampRequest tsReq =
tsqGenerator.generate(TSPAlgorithms.SHA1, digest, BigInteger.valueOf(100));
byte[] respBytes;
try {
byte[] requestBytes = tsReq.getEncoded();
URL url = new URL(tsaURL);
HttpsURLConnection tsaConnection = (HttpsURLConnection) url.openConnection();
String user_pass = Base64.encodeToString((tsaUsername + ":" + tsaPassword).getBytes(), 0);
tsaConnection.setRequestProperty("Authorization", "Basic " + user_pass);
tsaConnection.setDoInput(true);
tsaConnection.setDoOutput(true);
tsaConnection.setUseCaches(false);
tsaConnection.setRequestProperty("Content-Type", "application/timestamp-query");
tsaConnection.setRequestProperty("Content-Transfer-Encoding", "binary");
OutputStream out = tsaConnection.getOutputStream();
out.write(requestBytes);
out.close();
InputStream inp = tsaConnection.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = inp.read(buffer, 0, buffer.length)) >= 0) {
baos.write(buffer, 0, bytesRead);
}
respBytes = baos.toByteArray();
String encoding = tsaConnection.getContentEncoding();
if (encoding != null && encoding.equalsIgnoreCase("base64")) {
respBytes = Base64.decode(new String(respBytes), 0);
}
if (respBytes == null) {
String error = "Error: Impossible to get TSA response";
Log.e(TAG, error);
}
TimeStampResponse tsRes = new TimeStampResponse(respBytes);
tsRes.validate(tsReq);
PKIFailureInfo failure = tsRes.getFailInfo();
int value = (failure == null) ? 0 : failure.intValue();
if (value != 0) {
String error = "Error: Invalid TSA response (" + tsRes.getStatusString() + ")";
Log.e(TAG, error);
return null;
}
TimeStampToken myTSToken = tsRes.getTimeStampToken();
if (myTSToken == null) {
String error = "Error: Invalid TSA response (NULL)";
Log.e(TAG, error);
return null;
}
return myTSToken.getEncoded();
} catch (IOException | TSPException e) {
Log.e(TAG, e.getMessage());
}
return null;
}
