CryptMsgSignCTL function (wincrypt.h)

The CryptMsgSignCTL function creates a signed message containing an encoded CTL.


BOOL CryptMsgSignCTL(
  [in]      DWORD                    dwMsgEncodingType,
  [in]      BYTE                     *pbCtlContent,
  [in]      DWORD                    cbCtlContent,
  [in]      PCMSG_SIGNED_ENCODE_INFO pSignInfo,
  [in]      DWORD                    dwFlags,
  [out]     BYTE                     *pbEncoded,
  [in, out] DWORD                    *pcbEncoded


[in] dwMsgEncodingType

Specifies the encoding type used. It is always acceptable to specify both the certificate and message encoding types by combining them with a bitwise-OR operation as shown in the following example:


Currently defined encoding types are:


[in] pbCtlContent

The encoded CTL_INFO that can be a member of a CTL_CONTEXT structure or can be created using the CryptEncodeObject function.

[in] cbCtlContent

The size, in bytes, of the content pointed to by pbCtlContent.

[in] pSignInfo

A pointer to a CMSG_SIGNED_ENCODE_INFO structure containing an array of a CMSG_SIGNER_ENCODE_INFO structures.

The message can be encoded without signers if the cbSize member of the structure is set to the size of the structure and all of the other members are set to zero.

[in] dwFlags

If CMS_PKCS7 is defined, can be set to CMSG_CMS_ENCAPSULATED_CTL_FLAG to encode a CMS compatible V3 SignedData message.

[out] pbEncoded

A pointer to a buffer to receives the encoded message.

This parameter can be NULL to get the size of this information for memory allocation purposes. For more information, see Retrieving Data of Unknown Length.

[in, out] pcbEncoded

A pointer to a DWORD specifying the size, in bytes, of the pbEncoded buffer. When the function returns, the DWORD contains the number of bytes stored or to be stored in the buffer.

Return value

If the function succeeds, the return value is nonzero (TRUE).

If the function fails, the return value is zero (FALSE). For extended error information, call GetLastError. This function can return errors propagated from calls to CryptMsgOpenToEncode and CryptMsgUpdate.


Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header wincrypt.h
Library Crypt32.lib
DLL Crypt32.dll

See also




Verification Functions Using CTLs