public void VerifyExtendedSignatureUsingPublicationsFile()
{
KSI.Ksi ksi = GetKsi();
// Read the existing signature, assume it is extended
IKsiSignature signature = LoadExtendedSignature();
// We need to compute the hash from the original data, to make sure it
// matches the one in the signature and has not been changed
// Use the same algorithm as the input hash in the signature
IDataHasher dataHasher = new DataHasher(signature.GetAggregationHashChains()[0].InputHash.Algorithm);
dataHasher.AddData(File.ReadAllBytes("Resources/infile.txt"));
// Do the verification and check the result
VerificationPolicy policy = new PublicationBasedVerificationPolicy();
VerificationContext context = new VerificationContext(signature)
{
DocumentHash = dataHasher.GetHash(),
PublicationsFile = ksi.GetPublicationsFile(),
};
VerificationResult verificationResult = policy.Verify(context);
if (verificationResult.ResultCode == VerificationResultCode.Ok)
{
Console.WriteLine("VerifyExtendedSignatureUsingPublicationsFile > signature valid");
}
else
{
Console.WriteLine("VerifyExtendedSignatureUsingPublicationsFile > verification failed with error > " + verificationResult.VerificationError);
}
}
public void VerifyKeyBased()
{
KSI.Ksi ksi = GetKsi();
// Read signature, assume to be not extended
IKsiSignature signature = LoadUnextendedSignature();
IDataHasher dataHasher = new DataHasher(signature.GetAggregationHashChains()[0].InputHash.Algorithm);
dataHasher.AddData(File.ReadAllBytes("Resources/infile.txt"));
VerificationPolicy policy = new KeyBasedVerificationPolicy(new X509Store(StoreName.Root), GetCertificateSubjectRdnSelector());
VerificationContext context = new VerificationContext(signature)
{
DocumentHash = dataHasher.GetHash(),
PublicationsFile = ksi.GetPublicationsFile(),
};
VerificationResult verificationResult = policy.Verify(context);
if (verificationResult.ResultCode == VerificationResultCode.Ok)
{
Console.WriteLine("VerifyKeyBased > signature valid");
}
else
{
Console.WriteLine("VerifyKeyBased > signature verification failed with error > " + verificationResult.VerificationError);
}
}
public void VerifyExtendedSignatureUsingPublicationsFile()
{
KSI.Ksi ksi = GetKsi();
// Read the existing signature, assume it is extended
IKsiSignature signature = LoadExtendedSignature();
DataHash documentHash = KsiProvider.CreateDataHasher(signature.InputHash.Algorithm)
.AddData(File.ReadAllBytes("Resources/infile.txt"))
.GetHash();
// Do the verification and check the result
VerificationPolicy policy = new PublicationBasedVerificationPolicy();
VerificationContext context = new VerificationContext(signature)
{
DocumentHash = documentHash,
PublicationsFile = ksi.GetPublicationsFile(),
};
VerificationResult verificationResult = policy.Verify(context);
if (verificationResult.ResultCode == VerificationResultCode.Ok)
{
Console.WriteLine("VerifyExtendedSignatureUsingPublicationsFile > signature valid");
}
else
{
Console.WriteLine("VerifyExtendedSignatureUsingPublicationsFile > verification failed with error > " + verificationResult.VerificationError);
}
}
public void ExtendToGivenPublicationDate()
{
KSI.Ksi ksi = GetKsi();
IKsiSignature signature = LoadUnextendedSignature();
PublicationRecordInPublicationFile publicationRecord = ksi.GetPublicationsFile().GetNearestPublicationRecord(new DateTime(2016, 2, 15));
if (publicationRecord == null)
{
Console.WriteLine("ExtendToGivenPublicationDate > no suitable publication yet. signature not extended");
return;
}
Console.WriteLine("ExtendToGivenPublicationDate > trying to extend signature to publication > "
+ Util.ConvertUnixTimeToDateTime(publicationRecord.PublicationData.PublicationTime));
IKsiSignature extendedSignature = ksi.Extend(signature, publicationRecord);
if (extendedSignature.IsExtended)
{
Console.WriteLine("ExtendToGivenPublicationDate > signature extended to publication > "
+ Util.ConvertUnixTimeToDateTime(extendedSignature.PublicationRecord.PublicationData.PublicationTime));
// Store the extended signature
// ...
}
else
{
Console.WriteLine("ExtendToGivenPublicationDate > signature not extended");
}
}
public void PrintPublicationInfo()
{
KSI.Ksi ksi = GetKsi();
PublicationRecord publicationRecord = ksi.GetPublicationsFile().GetNearestPublicationRecord(new DateTime(2016, 2, 1));
foreach (string s in publicationRecord.PublicationReferences)
{
Console.WriteLine("PrintPublicationInfo > publication reference > " + s);
}
}
public void ExtendToLatestPublication()
{
KSI.Ksi ksi = GetKsi();
IKsiSignature signature = LoadUnextendedSignature();
PublicationRecordInPublicationFile latestPublicationRecord = ksi.GetPublicationsFile().GetLatestPublication();
if (!signature.IsExtended || signature.PublicationRecord.PublicationData.PublicationTime < latestPublicationRecord.PublicationData.PublicationTime)
{
IKsiSignature extendedSignature = ksi.Extend(signature, latestPublicationRecord);
if (extendedSignature.IsExtended)
{
Console.WriteLine("ExtendToLatestPublication > signature extended to publication > " +
Util.ConvertUnixTimeToDateTime(extendedSignature.PublicationRecord.PublicationData.PublicationTime));
// Store the extended signature
// ...
}
}
}
