com.itextpdf.signatures.ITSAClient Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2022 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
OF THIRD PARTY RIGHTS
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or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
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The interactive user interfaces in modified source and object code versions
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Section 5 of the GNU Affero General Public License.
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or manipulated using iText.
You can be released from the requirements of the license by purchasing
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*/
package com.itextpdf.signatures;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
/**
* Time Stamp Authority client (caller) interface.
*
* Interface used by the PdfPKCS7 digital signature builder to call
* Time Stamp Authority providing RFC 3161 compliant time stamp token.
*/
public interface ITSAClient {
/**
* Get the time stamp estimated token size.
* Implementation must return value large enough to accommodate the
* entire token returned by {@link #getTimeStampToken(byte[])} prior
* to actual {@link #getTimeStampToken(byte[])} call.
*
* @return an estimate of the token size
*/
int getTokenSizeEstimate();
/**
* Returns the {@link MessageDigest} to digest the data imprint
*
* @return The {@link MessageDigest} object.
* @throws GeneralSecurityException the general security exception
*/
MessageDigest getMessageDigest() throws GeneralSecurityException;
/**
* Returns RFC 3161 timeStampToken.
*
* @param imprint byte[] - data imprint to be time-stamped
* @return byte[] - encoded, TSA signed data of the timeStampToken
* @throws Exception - TSA request failed
*/
byte[] getTimeStampToken(byte[] imprint) throws Exception;
}