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CSecureChannelClient::DecryptParam

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The DecryptParam method decrypts data received through a parameter. Encryption is performed in-place on the encrypted data.

Syntax

HRESULT DecryptParam(BYTE*pbData,
  DWORDdwDataLen);

Parameters

pbData

[in, out] Pointer to the data buffer that holds the information to decrypt. On input contains the encrypted data; on output, contains the decrypted data. The decrypted data is the same length as the encrypted data.

dwDataLen

[in] Pointer to a DWORD specifying the length of the buffer to which pbData points.

Return Values

The method returns an HRESULT. All the interface methods in Windows Media Device Manager can return any of the following classes of error codes:

  • Standard COM error codes
  • Windows error codes converted to HRESULT values
  • Windows Media Device Manager error codes

For an extenstive list of possible error codes, see Error Codes.

Possible values include, but are not limited to, those in the following table.

Return code Description
S_OK The method succeeded.
E_INVALIDARG A parameter is invalid or is a NULL pointer.
E_FAIL An unspecified error occurred.

Remarks

This is used by IWMDMOperation::TransferObjectData to decrypt data read from the device.

For robustness, before calling the DecryptParam method, components should copy the data to a temporary buffer and then use DecryptParam to decrypt the temporary buffer. Decryption is handled in-place in the buffer; the buffer does not need to be resized.

For example code, see IWMDMOperation::TransferObjectData.

Requirements

Header: Include scclient.h.

Library: mssachlp.lib

See Also