public RFC3161TimestampSignature(CmsSignature rfc3161Signature) : base(rfc3161Signature)
{
var content = rfc3161Signature.Content;
if (content is object)
{
TimestampDateTime = TimestampDecoding.DecodeRfc3161(content);
}
}
private static unsafe IReadOnlyList <ICmsSignature> GetSignatures(CryptMsgSafeHandle messageHandle)
{
var countSize = 0u;
if (!Crypt32.CryptMsgGetParam(messageHandle, CryptMsgParamType.CMSG_SIGNER_COUNT_PARAM, 0, LocalBufferSafeHandle.Zero, ref countSize))
{
return(Array.Empty <ICmsSignature>());
}
uint signerCount;
using (var countHandle = LocalBufferSafeHandle.Alloc(countSize))
{
if (!Crypt32.CryptMsgGetParam(messageHandle, CryptMsgParamType.CMSG_SIGNER_COUNT_PARAM, 0, countHandle, ref countSize))
{
return(Array.Empty <ICmsSignature>());
}
signerCount = (uint)Marshal.ReadInt32(countHandle.DangerousGetHandle());
}
var signatures = new List <ICmsSignature>();
var contentSize = 0u;
byte[] content = null;
if (Crypt32.CryptMsgGetParam(messageHandle, CryptMsgParamType.CMSG_CONTENT_PARAM, 0, LocalBufferSafeHandle.Zero, ref contentSize))
{
using (var contentHandle = LocalBufferSafeHandle.Alloc(contentSize))
{
if (Crypt32.CryptMsgGetParam(messageHandle, CryptMsgParamType.CMSG_CONTENT_PARAM, 0, contentHandle, ref contentSize))
{
content = new byte[contentSize];
Marshal.Copy(contentHandle.DangerousGetHandle(), content, 0, (int)contentSize);
}
}
}
for (var i = 0u; i < signerCount; i++)
{
var signerSize = 0u;
if (!Crypt32.CryptMsgGetParam(messageHandle, CryptMsgParamType.CMSG_SIGNER_INFO_PARAM, i, LocalBufferSafeHandle.Zero, ref signerSize))
{
continue;
}
using (var signerHandle = LocalBufferSafeHandle.Alloc(signerSize))
{
if (!Crypt32.CryptMsgGetParam(messageHandle, CryptMsgParamType.CMSG_SIGNER_INFO_PARAM, i, signerHandle, ref signerSize))
{
continue;
}
var signature = new CmsSignature(SignatureKind.Signature, messageHandle, signerHandle, content);
signatures.Add(signature);
}
}
return(signatures.AsReadOnly());
}
