com.itextpdf.signatures

Interface ITSAClient

All Known Implementing Classes:

TSAClientBouncyCastle

public interface ITSAClient

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.

Method Summary

Modifier and Type	Method and Description
MessageDigest	getMessageDigest() Returns the MessageDigest to digest the data imprint
byte[]	getTimeStampToken(byte[] imprint) Returns RFC 3161 timeStampToken.
int	getTokenSizeEstimate() Get the time stamp estimated token size.

Method Detail

getTokenSizeEstimate

int getTokenSizeEstimate()

Get the time stamp estimated token size. Implementation must return value large enough to accommodate the entire token returned by getTimeStampToken(byte[]) prior to actual getTimeStampToken(byte[]) call.

Returns:

an estimate of the token size

getMessageDigest

MessageDigest getMessageDigest()
                        throws GeneralSecurityException

Returns the MessageDigest to digest the data imprint

Returns:

The MessageDigest object.

Throws:

GeneralSecurityException

getTimeStampToken

byte[] getTimeStampToken(byte[] imprint)
                  throws Exception

Returns RFC 3161 timeStampToken.

Parameters:

imprint - byte[] - data imprint to be time-stamped

Returns:

byte[] - encoded, TSA signed data of the timeStampToken

Throws:

Exception - - TSA request failed