Demo.RSACryptoServiceProviderExtension.GetPublicKeyBlobFromRSA C# (CSharp) Метод

        internal static byte[] GetPublicKeyBlobFromRSA(byte[] RSAData)
        {
            byte[] data = null;
            UInt32 dwCertPublicKeyBlobSize = 0;
            if (RSACryptoServiceProviderExtension.CryptDecodeObject(CRYPT_ENCODING_FLAGS.X509_ASN_ENCODING | CRYPT_ENCODING_FLAGS.PKCS_7_ASN_ENCODING,
                new IntPtr((int)CRYPT_OUTPUT_TYPES.RSA_CSP_PUBLICKEYBLOB), RSAData, (UInt32)RSAData.Length, CRYPT_DECODE_FLAGS.NONE,
                data, ref dwCertPublicKeyBlobSize))
            {
                data = new byte[dwCertPublicKeyBlobSize];
                if (!RSACryptoServiceProviderExtension.CryptDecodeObject(CRYPT_ENCODING_FLAGS.X509_ASN_ENCODING | CRYPT_ENCODING_FLAGS.PKCS_7_ASN_ENCODING,
                    new IntPtr((int)CRYPT_OUTPUT_TYPES.RSA_CSP_PUBLICKEYBLOB), RSAData, (UInt32)RSAData.Length, CRYPT_DECODE_FLAGS.NONE,
                    data, ref dwCertPublicKeyBlobSize))
                    throw new Win32Exception(Marshal.GetLastWin32Error());
            }
            else
                throw new Win32Exception(Marshal.GetLastWin32Error());
            return data;
        }

 /// <summary>Extension method which initializes an RSACryptoServiceProvider from a DER public key blob.</summary>
 public static void LoadPublicKeyDER(this RSACryptoServiceProvider provider, byte[] DERData)
 {
     byte[] RSAData       = RSACryptoServiceProviderExtension.GetRSAFromDER(DERData);
     byte[] publicKeyBlob = RSACryptoServiceProviderExtension.GetPublicKeyBlobFromRSA(RSAData);
     provider.ImportCspBlob(publicKeyBlob);
 }