System.Security.Cryptography.DSAImplementation.DSACng.ComputeQLength C# (CSharp) Method

            private int ComputeQLength()
            {
                byte[] blob;
                using (SafeNCryptKeyHandle keyHandle = GetDuplicatedKeyHandle())
                {
                    blob = this.ExportKeyBlob(false);
                }

                unsafe
                {
                    if (blob.Length < sizeof(BCRYPT_DSA_KEY_BLOB_V2))
                    {
                        return Sha1HashOutputSize;
                    }

                    fixed (byte* pBlobBytes = blob)
                    {
                        BCRYPT_DSA_KEY_BLOB_V2* pBlob = (BCRYPT_DSA_KEY_BLOB_V2*)pBlobBytes;
                        if (pBlob->Magic != KeyBlobMagicNumber.BCRYPT_DSA_PUBLIC_MAGIC_V2 && pBlob->Magic != KeyBlobMagicNumber.BCRYPT_DSA_PRIVATE_MAGIC_V2)
                        {
                            // This is a V1 BCRYPT_DSA_KEY_BLOB, which hardcodes the Q length to 20 bytes.
                            return Sha1HashOutputSize;
                        }

                        return pBlob->cbGroupSize;
                    }
                }
            }
        }