private void InitFromHandles(CryptMsgSafeHandle messageHandle, LocalBufferSafeHandle signerHandle)
{
var signerInfo = Marshal.PtrToStructure <CMSG_SIGNER_INFO>(signerHandle.DangerousGetHandle());
var subjectId = new UniversalSubjectIdentifier(signerInfo.Issuer, signerInfo.SerialNumber);
var certs = GetCertificatesFromMessage(messageHandle);
if (subjectId.Type == SubjectIdentifierType.SubjectKeyIdentifier)
{
Certificate = FindCertificate((string)subjectId.Value, certs);
}
else if (subjectId.Type == SubjectIdentifierType.IssuerAndSerialNumber)
{
Certificate = FindCertificate((X509IssuerSerial)subjectId.Value, certs);
}
AdditionalCertificates = certs;
DigestAlgorithm = new Oid(signerInfo.HashAlgorithm.pszObjId);
HashEncryptionAlgorithm = new Oid(signerInfo.HashEncryptionAlgorithm.pszObjId);
SerialNumber = ReadBlob(signerInfo.SerialNumber);
UnsignedAttributes = ReadAttributes(signerInfo.UnauthAttrs);
SignedAttributes = ReadAttributes(signerInfo.AuthAttrs);
}
public unsafe AuthenticodeSignature(AsnEncodedData data, ISignature owningSignature)
{
OwningSignature = owningSignature;
Kind = SignatureKind.AuthenticodeTimestamp;
AdditionalCertificates = owningSignature.AdditionalCertificates;
fixed(byte *dataPtr = data.RawData)
{
uint size = 0;
LocalBufferSafeHandle localBuffer;
if (Crypt32.CryptDecodeObjectEx(EncodingType.PKCS_7_ASN_ENCODING | EncodingType.X509_ASN_ENCODING, (IntPtr)500, new IntPtr(dataPtr), (uint)data.RawData.Length, CryptDecodeFlags.CRYPT_DECODE_ALLOC_FLAG, IntPtr.Zero, out localBuffer, ref size))
{
using (localBuffer)
{
var signerInfo = Marshal.PtrToStructure <CMSG_SIGNER_INFO>(localBuffer.DangerousGetHandle());
DigestAlgorithm = new Oid(signerInfo.HashAlgorithm.pszObjId);
HashEncryptionAlgorithm = new Oid(signerInfo.HashEncryptionAlgorithm.pszObjId);
SerialNumber = ReadBlob(signerInfo.SerialNumber);
UnsignedAttributes = ReadAttributes(signerInfo.UnauthAttrs);
SignedAttributes = ReadAttributes(signerInfo.AuthAttrs);
var subjectId = new UniversalSubjectIdentifier(signerInfo.Issuer, signerInfo.SerialNumber);
if (subjectId.Type == SubjectIdentifierType.SubjectKeyIdentifier)
{
Certificate = FindCertificate((string)subjectId.Value, OwningSignature.AdditionalCertificates);
}
else if (subjectId.Type == SubjectIdentifierType.IssuerAndSerialNumber)
{
Certificate = FindCertificate((X509IssuerSerial)subjectId.Value, OwningSignature.AdditionalCertificates);
}
}
}
else
{
throw new InvalidOperationException("Failed to read Authenticode signature");
}
}
}