internal static RecipientInfoType GetRecipientInfoType(X509Certificate2 certificate)
{
RecipientInfoType recipientInfoType = RecipientInfoType.Unknown;
if (certificate != null)
{
switch (X509Utils.OidToAlgId(((CAPI.CERT_INFO)Marshal.PtrToStructure(((CAPI.CERT_CONTEXT)Marshal.PtrToStructure(X509Utils.GetCertContext(certificate).DangerousGetHandle(), typeof(CAPI.CERT_CONTEXT))).pCertInfo, typeof(CAPI.CERT_INFO))).SubjectPublicKeyInfo.Algorithm.pszObjId))
{
case 41984U:
recipientInfoType = RecipientInfoType.KeyTransport;
break;
case 43521U:
case 43522U:
recipientInfoType = RecipientInfoType.KeyAgreement;
break;
default:
recipientInfoType = RecipientInfoType.Unknown;
break;
}
}
return(recipientInfoType);
}
internal AlgorithmIdentifier(CAPI.CRYPT_ALGORITHM_IDENTIFIER algorithmIdentifier)
{
int keyLength = 0;
uint cbDecodedValue = 0U;
SafeLocalAllocHandle decodedValue = SafeLocalAllocHandle.InvalidHandle;
byte[] numArray = new byte[0];
uint num = X509Utils.OidToAlgId(algorithmIdentifier.pszObjId);
switch (num)
{
case 26114U:
if (algorithmIdentifier.Parameters.cbData > 0U)
{
if (!CAPI.DecodeObject(new IntPtr(41L), algorithmIdentifier.Parameters.pbData, algorithmIdentifier.Parameters.cbData, out decodedValue, out cbDecodedValue))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
CAPI.CRYPT_RC2_CBC_PARAMETERS rc2CbcParameters = (CAPI.CRYPT_RC2_CBC_PARAMETERS)Marshal.PtrToStructure(decodedValue.DangerousGetHandle(), typeof(CAPI.CRYPT_RC2_CBC_PARAMETERS));
switch (rc2CbcParameters.dwVersion)
{
case 52U:
keyLength = 56;
break;
case 58U:
keyLength = 128;
break;
case 160U:
keyLength = 40;
break;
}
if (rc2CbcParameters.fIV)
{
numArray = (byte[])rc2CbcParameters.rgbIV.Clone();
break;
}
else
{
break;
}
}
else
{
break;
}
case 26625U:
case 26113U:
case 26115U:
if (algorithmIdentifier.Parameters.cbData > 0U)
{
if (!CAPI.DecodeObject(new IntPtr(25L), algorithmIdentifier.Parameters.pbData, algorithmIdentifier.Parameters.cbData, out decodedValue, out cbDecodedValue))
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
if (cbDecodedValue > 0U)
{
if ((int)num == 26625)
{
CAPI.CRYPTOAPI_BLOB cryptoapiBlob = (CAPI.CRYPTOAPI_BLOB)Marshal.PtrToStructure(decodedValue.DangerousGetHandle(), typeof(CAPI.CRYPTOAPI_BLOB));
if (cryptoapiBlob.cbData > 0U)
{
numArray = new byte[(IntPtr)cryptoapiBlob.cbData];
Marshal.Copy(cryptoapiBlob.pbData, numArray, 0, numArray.Length);
}
}
else
{
numArray = new byte[(IntPtr)cbDecodedValue];
Marshal.Copy(decodedValue.DangerousGetHandle(), numArray, 0, numArray.Length);
}
}
}
keyLength = (int)num != 26625 ? ((int)num != 26113 ? 192 : 64) : 128 - numArray.Length * 8;
break;
default:
if (algorithmIdentifier.Parameters.cbData > 0U)
{
numArray = new byte[(IntPtr)algorithmIdentifier.Parameters.cbData];
Marshal.Copy(algorithmIdentifier.Parameters.pbData, numArray, 0, numArray.Length);
break;
}
else
{
break;
}
}
this.Reset(new Oid(algorithmIdentifier.pszObjId), keyLength, numArray);
decodedValue.Dispose();
}