/// <summary>
/// Extend signature to publication.
/// </summary>
/// <param name="calendarHashChain">extended calendar hash chain</param>
/// <param name="publicationRecord">extended publication record</param>
/// <param name="signatureFactory">signature factory to be used when creating extended signature</param>
/// <returns>extended KSI signature</returns>
public IKsiSignature Extend(CalendarHashChain calendarHashChain, PublicationRecordInSignature publicationRecord, IKsiSignatureFactory signatureFactory = null)
{
Logger.Debug("Extending KSI signature.");
if (calendarHashChain == null)
{
throw new ArgumentNullException(nameof(calendarHashChain));
}
if (CalendarHashChain != null && !CalendarHashChain.AreRightLinksEqual(calendarHashChain))
{
throw new KsiException("Right links of signature calendar hash chain and extended calendar hash chain do not match");
}
if (publicationRecord == null)
{
publicationRecord = new PublicationRecordInSignature(false, false, calendarHashChain.PublicationData);
}
if (signatureFactory == null)
{
signatureFactory = new KsiSignatureFactory();
}
using (TlvWriter writer = new TlvWriter(new MemoryStream()))
{
foreach (ITlvTag childTag in this)
{
switch (childTag.Type)
{
case Constants.CalendarHashChain.TagType:
case Constants.CalendarAuthenticationRecord.TagType:
case Constants.PublicationRecord.TagTypeInSignature:
break;
default:
writer.WriteTag(childTag);
break;
}
}
writer.WriteTag(calendarHashChain);
writer.WriteTag(publicationRecord);
try
{
IKsiSignature signature = signatureFactory.CreateByContent(((MemoryStream)writer.BaseStream).ToArray(), InputHash);
Logger.Debug("Extending KSI signature successful.");
return(signature);
}
catch (TlvException e)
{
Logger.Warn("Extending KSI signature failed: {0}", e);
throw;
}
}
}
/// <summary>
/// Compare right links if they are equal.
/// </summary>
/// <param name="calendarHashChain">calendar hash chain to compare to</param>
/// <returns>true if right links are equal and in same order</returns>
public bool AreRightLinksEqual(CalendarHashChain calendarHashChain)
{
IEnumerator <Link> currentEnumerator = GetRightLinksEnumerable(_chain).GetEnumerator();
IEnumerator <Link> externalEnumerator = GetRightLinksEnumerable(calendarHashChain._chain).GetEnumerator();
Link currentLink = currentEnumerator.MoveNext() ? currentEnumerator.Current : null;
Link externalLink = externalEnumerator.MoveNext() ? externalEnumerator.Current : null;
while (currentLink != null || externalLink != null)
{
if (currentLink != externalLink)
{
return(false);
}
currentLink = currentEnumerator.MoveNext() ? currentEnumerator.Current : null;
externalLink = externalEnumerator.MoveNext() ? externalEnumerator.Current : null;
}
return(true);
}
/// <summary>
/// Create KSI signature instance from tlv tags
/// </summary>
/// <param name="aggregationHashChains">Aggregation hash chain tlv elements</param>
/// <param name="calendarHashChain">Calendar hash chain tlv element</param>
/// <param name="calendarAuthenticationRecord">Calendar authentication record tlv element</param>
/// <param name="publicationRecord">Publication record tlv element</param>
/// <param name="rfc3161Record">RFC3161 record tlv element</param>
/// <param name="hash">Signed hash</param>
/// <returns></returns>
public IKsiSignature Create(ICollection <AggregationHashChain> aggregationHashChains, CalendarHashChain calendarHashChain,
CalendarAuthenticationRecord calendarAuthenticationRecord, PublicationRecordInSignature publicationRecord,
Rfc3161Record rfc3161Record, DataHash hash)
{
List <ITlvTag> childTags = new List <ITlvTag>();
if (rfc3161Record != null)
{
childTags.Add(rfc3161Record);
}
if (aggregationHashChains == null)
{
throw new ArgumentNullException(nameof(aggregationHashChains));
}
foreach (AggregationHashChain childTag in aggregationHashChains)
{
childTags.Add(childTag);
}
if (calendarHashChain != null)
{
childTags.Add(calendarHashChain);
}
if (publicationRecord != null)
{
childTags.Add(publicationRecord);
}
if (calendarAuthenticationRecord != null)
{
childTags.Add(calendarAuthenticationRecord);
}
return(CreateAndVerify(childTags.ToArray(), hash));
}
/// <summary>
/// Extend signature to publication.
/// </summary>
/// <param name="calendarHashChain">extended calendar hash chain</param>
/// <param name="publicationRecord">extended publication record</param>
/// <param name="signatureFactory">signature factory to be used when creating extended signature</param>
/// <returns>extended KSI signature</returns>
public IKsiSignature Extend(CalendarHashChain calendarHashChain, PublicationRecordInPublicationFile publicationRecord, IKsiSignatureFactory signatureFactory = null)
{
return(Extend(calendarHashChain, publicationRecord?.ConvertToPublicationRecordInSignature(), signatureFactory));
}
/// <summary>
/// Extend KSI signature with given calendar hash chain.
/// </summary>
/// <param name="calendarHashChain">calendar hash chain</param>
/// <param name="signatureFactory">signature factory to be used when creating extended signature</param>
/// <returns>extended KSI signature</returns>
public IKsiSignature Extend(CalendarHashChain calendarHashChain, IKsiSignatureFactory signatureFactory = null)
{
return(Extend(calendarHashChain, (PublicationRecordInSignature)null, signatureFactory));
}
