TryEncryptOrDecrypt() [1/2]

unsafe bool System.Security.Cryptography.RSACng.TryEncryptOrDecrypt ( ReadOnlySpan< byte > data, Span< byte > destination, RSAEncryptionPadding padding, bool encrypt, out int bytesWritten )

inlineprivate

Definition at line 233 of file RSACng.cs.

    {
        if (padding == null)
        {
            throw new ArgumentNullException("padding");
        }
        int num = System.Security.Cryptography.RsaPaddingProcessor.BytesRequiredForBitCount(KeySize);
        if (!encrypt && data.Length != num)
        {
            throw new CryptographicException(System.SR.Cryptography_RSA_DecryptWrongSize);
        }
        if (encrypt && padding.Mode == RSAEncryptionPaddingMode.Pkcs1 && data.Length > num - 11)
        {
            throw new CryptographicException(System.SR.Format(System.SR.Cryptography_Encryption_MessageTooLong, num - 11));
        }
        using SafeNCryptKeyHandle key = GetDuplicatedKeyHandle();
        if (encrypt && data.Length == 0)
        {
            byte[] array = System.Security.Cryptography.CryptoPool.Rent(num);
            Span<byte> span = new Span<byte>(array, 0, num);
            try
            {
                if (padding == RSAEncryptionPadding.Pkcs1)
                {
                    System.Security.Cryptography.RsaPaddingProcessor.PadPkcs1Encryption(data, span);
                }
                else
                {
                    if (padding.Mode != RSAEncryptionPaddingMode.Oaep)
                    {
                        throw new CryptographicException(System.SR.Cryptography_UnsupportedPaddingMode);
                    }
                    System.Security.Cryptography.RsaPaddingProcessor rsaPaddingProcessor = System.Security.Cryptography.RsaPaddingProcessor.OpenProcessor(padding.OaepHashAlgorithm);
                    rsaPaddingProcessor.PadOaep(data, span);
                }
                return TryEncryptOrDecrypt(key, span, destination, global::Interop.NCrypt.AsymmetricPaddingMode.NCRYPT_NO_PADDING_FLAG, null, encrypt, out bytesWritten);
            }
            finally
            {
                CryptographicOperations.ZeroMemory(span);
                System.Security.Cryptography.CryptoPool.Return(array, 0);
            }
        }
        switch (padding.Mode)
        {
        case RSAEncryptionPaddingMode.Pkcs1:
            return TryEncryptOrDecrypt(key, data, destination, global::Interop.NCrypt.AsymmetricPaddingMode.NCRYPT_PAD_PKCS1_FLAG, null, encrypt, out bytesWritten);
        case RSAEncryptionPaddingMode.Oaep:
        {
            IntPtr intPtr = Marshal.StringToHGlobalUni(padding.OaepHashAlgorithm.Name);
            try
            {
                global::Interop.BCrypt.BCRYPT_OAEP_PADDING_INFO bCRYPT_OAEP_PADDING_INFO = default(global::Interop.BCrypt.BCRYPT_OAEP_PADDING_INFO);
                bCRYPT_OAEP_PADDING_INFO.pszAlgId = intPtr;
                bCRYPT_OAEP_PADDING_INFO.pbLabel = IntPtr.Zero;
                bCRYPT_OAEP_PADDING_INFO.cbLabel = 0;
                global::Interop.BCrypt.BCRYPT_OAEP_PADDING_INFO bCRYPT_OAEP_PADDING_INFO2 = bCRYPT_OAEP_PADDING_INFO;
                return TryEncryptOrDecrypt(key, data, destination, global::Interop.NCrypt.AsymmetricPaddingMode.NCRYPT_PAD_OAEP_FLAG, &bCRYPT_OAEP_PADDING_INFO2, encrypt, out bytesWritten);
            }
            finally
            {
                Marshal.FreeHGlobal(intPtr);
            }
        }
        default:
            throw new CryptographicException(System.SR.Cryptography_UnsupportedPaddingMode);
        }
    }

References System.array, System.Security.Cryptography.RsaPaddingProcessor.BytesRequiredForBitCount(), System.SR.Cryptography_Encryption_MessageTooLong, System.SR.Cryptography_RSA_DecryptWrongSize, System.SR.Cryptography_UnsupportedPaddingMode, System.destination, System.SR.Format(), System.Runtime.InteropServices.Marshal.FreeHGlobal(), System.Security.Cryptography.RSACng.GetDuplicatedKeyHandle(), System.key, System.Security.Cryptography.AsymmetricAlgorithm.KeySize, System.Security.Cryptography.RSAEncryptionPadding.Mode, System.Security.Cryptography.HashAlgorithmName.Name, System.Security.Cryptography.RSAEncryptionPadding.OaepHashAlgorithm, System.Security.Cryptography.RsaPaddingProcessor.OpenProcessor(), System.Security.Cryptography.RsaPaddingProcessor.PadPkcs1Encryption(), System.Security.Cryptography.RSAEncryptionPadding.Pkcs1, System.Security.Cryptography.CryptoPool.Rent(), System.Security.Cryptography.CryptoPool.Return(), System.Runtime.InteropServices.Marshal.StringToHGlobalUni(), System.Security.Cryptography.RSACng.TryEncryptOrDecrypt(), System.IntPtr.Zero, and System.Security.Cryptography.CryptographicOperations.ZeroMemory().

Referenced by System.Security.Cryptography.RSACng.TryDecrypt(), System.Security.Cryptography.RSACng.TryEncrypt(), and System.Security.Cryptography.RSACng.TryEncryptOrDecrypt().