com.guardtime.ksi.unisignature

Interface AggregationHashChain

public interface AggregationHashChain

An aggregation hash chain that represents (a part of) the computation of the per-round global root hash value from a document hash value. Aggregation hash chain contains the following data:

• index fields: an `aggregation time' and a sequence of `chain index' values;
• an `input hash' and an optional `input data': the input for the computation specified by the hash chain;
• `aggregation algorithm': the one-byte identifier of the hash function used to compute the output hash values of the link structures
• a sequence of `left link' and `right link' structures

Field Summary

Fields

Modifier and Type	Field and Description
static int	ELEMENT_TYPE

Method Summary

Modifier and Type	Method and Description
ChainResult	calculateOutputHash(long level) Calculates the aggregation hash chain output hash.
HashAlgorithm	getAggregationAlgorithm() Returns hash function algorithm used to compute the output hash values of the link structures
Date	getAggregationTime() Returns the aggregation time.
List<Long>	getChainIndex() Returns the chain index of the aggregation chain.
List<AggregationChainLink>	getChainLinks() Returns the list of aggregation chain left and right links.
Identity[]	getIdentity() Returns the array of the identities in the aggregation hash chain.
DataHash	getInputHash() Returns the input hash for the computation specified by the aggregation hash chain
DataHash	getOutputHash() Returns the output hash

Field Detail

ELEMENT_TYPE

static final int ELEMENT_TYPE

See Also:

Constant Field Values

Method Detail

getAggregationTime

Date getAggregationTime()

Returns the aggregation time.

getChainIndex

List<Long> getChainIndex()

Returns the chain index of the aggregation chain.

getInputHash

DataHash getInputHash()

Returns the input hash for the computation specified by the aggregation hash chain

getOutputHash

DataHash getOutputHash()

Returns the output hash

getChainLinks

List<AggregationChainLink> getChainLinks()

Returns the list of aggregation chain left and right links. List must always be ordered.

getIdentity

Identity[] getIdentity()

Returns the array of the identities in the aggregation hash chain.

calculateOutputHash

ChainResult calculateOutputHash(long level)
                         throws KSIException

Calculates the aggregation hash chain output hash.

Throws:

KSIException

getAggregationAlgorithm

HashAlgorithm getAggregationAlgorithm()

Returns hash function algorithm used to compute the output hash values of the link structures