CMSG_CTRL_DECRYPT_PARA (Windows CE 5.0)

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This structure contains information used to decrypt an enveloped message for a key transport recipient. This structure is passed to CryptMsgControl if the dwCtrlType parameter is CMSG_CTRL_DECRYPT.

Important changes affecting the handling of enveloped messages have been made to CryptoAPI to support S/MIME e-mail interoperability. For details, see the Remarks section of CryptMsgOpenToEncode.

typedef struct _CMSG_CTRL_DECRYPT_PARA {  DWORD cbSize;  HCRYPTPROV hCryptProv;  DWORD dwKeySpec;  DWORD dwRecipientIndex;} CMSG_CTRL_DECRYPT_PARA, *PCMSG_CTRL_DECRYPT_PARA;

Members

• cbSize
  Size of this structure in bytes.

• hCryptProv
  Cryptographic service provider (CSP) handle.

• dwKeySpec
  The private key to be used.

  The following dwKeySpec values are defined for the default provider.

  Value	Description
  AT_KEYEXCHANGE	Keys used to encrypt/decrypt session keys.
  AT_SIGNATURE	Keys used to create and verify digital signatures.

  If dwKeySpec is zero, the default AT_KEYEXCHANGE is used.

• dwRecipientIndex
  Index of the recipient in the message associated with the hCryptProv private key.

Requirements

OS Versions: Windows CE .NET 4.0 and later.
Header: Wincrypt.h.

See Also

Cryptography Structures

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