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 |