Package org.bouncycastle.tsp.ers

RFC 4998 Evidence Record Syntax (ERS) over RFC 3161 timestamps. Provides generators and verifiers for archive timestamps, archive-timestamp chains, and the Merkle-tree data-group construction used to bind multiple data objects under a single timestamp.

Interface Summary

Interface	Description
ERSData	General interface for a data object covered by an RFC 4998 Evidence Record - anything (a byte array, file, stream, or ERSDataGroup) that can produce the hash used as a leaf in the archive time-stamp's hash tree.
ERSRootNodeCalculator	Base interface for an implementation that calculates the root hash contained in the time-stamp from the Merkle tree based on the partial hash-tree nodes.

Class Summary

Class	Description
BinaryTreeRootCalculator	Calculator based on the use of a left weighted binary Merkle tree created on top of the partial hash tree objects provided.
ERSArchiveTimeStamp	Carrier for an RFC 4998 ArchiveTimeStamp - an RFC 3161 time-stamp token together with the reduced hash tree (a sequence of PartialHashtrees) that binds a particular data object or data group to the time-stamped root hash.
ERSArchiveTimeStampGenerator	Generator for RFC 4998 ArchiveTimeStamps.
ERSByteData	Generic class for holding byte[] data for RFC 4998 ERS.
ERSCachingData	Base ERSData implementation that caches calculated hashes, keyed by digest algorithm and previous-chain hash, so the (potentially expensive) hash of a data object is computed only once per combination.
ERSDataGroup	Representation of data groups with more than 1 members according to the description provided in RFC4998.
ERSDirectoryDataGroup	Representation of a data group based on a directory.
ERSEvidenceRecord	Carrier for an RFC 4998 EvidenceRecord - the ArchiveTimeStampSequence of ArchiveTimeStampChains that provides long-term, renewable proof of existence for one or more data objects.
ERSEvidenceRecordGenerator	Generator for RFC 4998 Evidence Records.
ERSEvidenceRecordSelector	Selector matching the ERSEvidenceRecords that contain, and validate the presence of, a given data object/group at a particular date.
ERSEvidenceRecordStore	A Store of ERSEvidenceRecords indexed by the data-object hashes found in the leaf (first) PartialHashtree of each record's initial ArchiveTimeStamp.
ERSFileData	Generic class for holding a File of data for RFC 4998 ERS.
ERSInputStreamData	Generic class for processing an InputStream (or File) of data for RFC 4998 ERS.
SortedHashList	A sorting list - byte[] are sorted in ascending order.
SortedIndexedHashList	A sorting list - byte[] are sorted in ascending order.

Exception Summary

Exception	Description
ArchiveTimeStampValidationException	Exception thrown when validation of an RFC 4998 ArchiveTimeStamp fails - for example when the expected data hash is not present in the reduced hash tree, or the recovered root hash does not match the time-stamp imprint.
ERSException	Base exception for errors in the RFC 4998 Evidence Record Syntax (ERS) layer.
PartialHashTreeVerificationException	Exception thrown when verification of an RFC 4998 PartialHashtree fails.