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CMSG_RC2_AUX_INFO structure (wincrypt.h)

The CMSG_RC2_AUX_INFO structure contains the bit length of the key for RC2 encryption algorithms. The pvEncryptionAuxInfo member in CMSG_ENVELOPED_ENCODE_INFO can be set to point to an instance of this structure.

Note  This structure is only used when the other members of a CMSG_ENVELOPED_ENCODE_INFO structure indicate that a default key length of 40 bits is to be used with an RC2 encryption algorithm. For more information, see CMSG_ENVELOPED_ENCODE_INFO.
 

Syntax

typedef struct _CMSG_RC2_AUX_INFO {
  DWORD cbSize;
  DWORD dwBitLen;
} CMSG_RC2_AUX_INFO, *PCMSG_RC2_AUX_INFO;

Members

cbSize

Size of this structure in bytes.

dwBitLen

Specifies the RC2 effective key length. Currently 40-, 64-, and 128-bit lengths are supported.

Note  This value is the actual key bit length to be used. The values of the dwVersion member of a CRYPT_RC2_CBC_PARAMETERS structure to indicate the use of a specific key length is not that specific key length. For example, the dwVersion value that indicates the use of a 128-bit key length is CRYPT_RC2_128BIT_VERSION, which is defined as 58, not 128 bits.
 
Note  If dwBitLen is set to CMSG_SP3_COMPATIBLE_ENCRYPT_FLAG, SP3 compatible encryption is done and the 40-bit default length is ignored.
 

Requirements

Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Header wincrypt.h

See also

CMSG_ENVELOPED_ENCODE_INFO

CRYPT_ALGORITHM_IDENTIFIER

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