KSISignature (KSI SDK 4.19.220 API)

```
public interface KSISignature
```
This interface represents a KSI uni-signature. KSI signature consist of the following components:
- One or more aggregation hash chain components that together form a single continuous chain.
- At most one calendar hash chain component. Represents the computation of the published hash value from the per-round root hash value.
- Publication record. Contains the published hash value and bibliographic references to the media where it appeared.
- Authentication record. Contains the trace of authenticating a party (e.g. a key-based signature). There are two types of authentication records: one for aggregation hash chains and another for calendar hash chains.
- At most one RFC 3161 compatibility record

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`Identity[]`	`getAggregationHashChainIdentity()` Returns an array of the identities present in all aggregation hash chains.
`AggregationHashChain[]`	`getAggregationHashChains()` Returns aggregation hash chains.
`Date`	`getAggregationTime()` Returns the aggregation time.
`CalendarAuthenticationRecord`	`getCalendarAuthenticationRecord()` Returns the signature calendar authentication record if signature isn't extended.
`CalendarHashChain`	`getCalendarHashChain()` Returns the signature calendar hash chain.
`DataHash`	`getInputHash()` If RFC3161 compatibility record is present then RFC3161 input hash will be returned.
`SignaturePublicationRecord`	`getPublicationRecord()` Returns the instance of signature publication record if signature is extended.
`Date`	`getPublicationTime()` Returns the publication time.
`RFC3161Record`	`getRfc3161Record()` An older implementation of the KSI service used the formats and protocols specified in the X.509 time-stamping standard (RFC 3161).
`boolean`	`isExtended()` Returns true if signature contains signature publication record element.
`void`	`writeTo(OutputStream output)` Writes `KSISignature` to given output stream

- Method Detail
  - getAggregationHashChains
```
AggregationHashChain[] getAggregationHashChains()
```
    Returns aggregation hash chains. Aggregation hash chains are sorted by aggregation time and aggregation chain indexes. At least one aggregation hash chain is always present.
  - getCalendarHashChain
```
CalendarHashChain getCalendarHashChain()
```
    Returns the signature calendar hash chain.
  - getCalendarAuthenticationRecord
```
CalendarAuthenticationRecord getCalendarAuthenticationRecord()
```
    Returns the signature calendar authentication record if signature isn't extended. If signature is extended the null is returned.
  - getPublicationRecord
```
SignaturePublicationRecord getPublicationRecord()
```
    Returns the instance of signature publication record if signature is extended. Returns null if signature isn't extended.
  - getRfc3161Record
```
RFC3161Record getRfc3161Record()
```
    An older implementation of the KSI service used the formats and protocols specified in the X.509 time-stamping standard (RFC 3161). In that format, the hash value of the time-stamped datum was not signed directly, but via several intermediate structures. This method returns the RFC3161 compatibility record (or null is RFC3161 record isn't present).
  - getInputHash
```
DataHash getInputHash()
```
    If RFC3161 compatibility record is present then RFC3161 input hash will be returned. If RFC3161 record isn't present then first aggregation chain input hash will be returned.
  - getAggregationTime
```
Date getAggregationTime()
```
    Returns the aggregation time.
  - getPublicationTime
```
Date getPublicationTime()
```
    Returns the publication time.
  - getAggregationHashChainIdentity
```
Identity[] getAggregationHashChainIdentity()
```
    Returns an array of the identities present in all aggregation hash chains. The identities in the array are ordered - the higher-aggregator identity is before lower-aggregator identity.
  - isExtended
```
boolean isExtended()
```
    Returns true if signature contains signature publication record element.
  - writeTo
```
void writeTo(OutputStream output)
      throws KSIException
```
    Writes KSISignature to given output stream
    
    Parameters:
    
    output - instance of OutputStream
    
    Throws:
    
    KSIException - will be thrown when writing to stream fails

Interface KSISignature

Method Summary

Method Detail

getAggregationHashChains

getCalendarHashChain

getCalendarAuthenticationRecord

getPublicationRecord

getRfc3161Record

getInputHash

getAggregationTime

getPublicationTime

getAggregationHashChainIdentity

isExtended

writeTo