private static bool IsRepositoryCounterSignerInfo(CRYPT_ATTRIBUTE_STRING commitmentTypeIndicationAttribute)
{
int sizeOfCryptIntegerBlob = MarshalUtility.SizeOf <CRYPT_INTEGER_BLOB>();
for (var i = 0; i < commitmentTypeIndicationAttribute.cValue; ++i)
{
var attributeValuePointer = new IntPtr(
(long)commitmentTypeIndicationAttribute.rgValue + (i * sizeOfCryptIntegerBlob));
var attributeValue = MarshalUtility.PtrToStructure <CRYPT_INTEGER_BLOB>(attributeValuePointer);
var bytes = new byte[attributeValue.cbData];
Marshal.Copy(attributeValue.pbData, bytes, startIndex: 0, length: bytes.Length);
var commitmentTypeIndication = CommitmentTypeIndication.Read(bytes);
if (string.Equals(
commitmentTypeIndication.CommitmentTypeId.Value,
Oids.CommitmentTypeIdentifierProofOfReceipt,
StringComparison.Ordinal))
{
return(true);
}
}
return(false);
}
/// <summary>
/// Create a CommitmentTypeIndication attribute.
/// https://tools.ietf.org/html/rfc5126.html#section-5.11.1
/// </summary>
/// <param name="type">The signature type.</param>
public static CryptographicAttributeObject CreateCommitmentTypeIndication(SignatureType type)
{
// SignatureType -> Oid
var oid = GetSignatureTypeOid(type);
var commitmentTypeIndication = CommitmentTypeIndication.Create(new Oid(oid));
var value = new AsnEncodedData(Oids.CommitmentTypeIndication, commitmentTypeIndication.Encode());
return(new CryptographicAttributeObject(
new Oid(Oids.CommitmentTypeIndication),
new AsnEncodedDataCollection(value)));
}
/// <summary>
/// Attribute -> SignatureType values with no validation.
/// </summary>
private static IEnumerable <SignatureType> GetCommitmentTypeIndicationRawValues(CryptographicAttributeObject attribute)
{
// Most packages should have either 0 or 1 signature types.
var values = new List <SignatureType>(capacity: 1);
foreach (var value in attribute.Values)
{
var indication = CommitmentTypeIndication.Read(value.RawData);
var signatureType = GetSignatureType(indication.CommitmentTypeId.Value);
values.Add(signatureType);
}
return(values);
}
