public UniversalSubjectIdentifier(CRYPTOAPI_BLOB issuer, CRYPTOAPI_BLOB serialNumber)
{
var allZeroSerial = IsBlobAllZero(serialNumber);
if (allZeroSerial)
{
var x500Name = LocalBufferSafeHandle.Zero;
var flags = EncodingType.PKCS_7_ASN_ENCODING | EncodingType.X509_ASN_ENCODING;
uint size = 0;
if (Crypt32.CryptDecodeObjectEx(flags, (IntPtr)7, issuer.pbData, issuer.cbData, CryptDecodeFlags.CRYPT_DECODE_ALLOC_FLAG, IntPtr.Zero, out x500Name, ref size))
{
using (x500Name)
{
var info = Marshal.PtrToStructure <CERT_NAME_INFO>(x500Name.DangerousGetHandle());
for (var i = 0L; i < info.cRDN; i++)
{
var rdn = Marshal.PtrToStructure <CERT_RDN>(new IntPtr(info.rgRDN.ToInt64() + i * Marshal.SizeOf <CERT_RDN>()));
for (var j = 0; j < rdn.cRDNAttr; j++)
{
var attribute = Marshal.PtrToStructure <CERT_RDN_ATTR>(new IntPtr(rdn.rgRDNAttr.ToInt64() + j * Marshal.SizeOf <CERT_RDN_ATTR>()));
if (attribute.pszObjId == KnownOids.KeyId)
{
Type = SubjectIdentifierType.SubjectKeyIdentifier;
var ski = new byte[attribute.Value.cbData];
Marshal.Copy(attribute.Value.pbData, ski, 0, ski.Length);
Value = HashHelpers.HexEncodeBigEndian(ski);
return;
}
}
}
}
}
}
unsafe
{
var result = Crypt32.CertNameToStr(EncodingType.PKCS_7_ASN_ENCODING | EncodingType.X509_ASN_ENCODING, new IntPtr(&issuer), CertNameStrType.CERT_X500_NAME_STR | CertNameStrType.CERT_NAME_STR_REVERSE_FLAG, null, 0);
if (result <= 1)
{
throw new InvalidOperationException();
}
var builder = new StringBuilder((int)result);
var final = Crypt32.CertNameToStr(EncodingType.PKCS_7_ASN_ENCODING | EncodingType.X509_ASN_ENCODING, new IntPtr(&issuer), CertNameStrType.CERT_X500_NAME_STR | CertNameStrType.CERT_NAME_STR_REVERSE_FLAG, builder, result);
if (final <= 1)
{
throw new InvalidOperationException();
}
var serial = new byte[serialNumber.cbData];
Marshal.Copy(serialNumber.pbData, serial, 0, serial.Length);
var issuerSerial = new X509IssuerSerial();
issuerSerial.IssuerName = builder.ToString();
issuerSerial.SerialNumber = HashHelpers.HexEncodeBigEndian(serial);
Value = issuerSerial;
Type = SubjectIdentifierType.IssuerAndSerialNumber;
}
}
