CRYPT_HASH_MESSAGE_PARA structure (wincrypt.h)
The CRYPT_HASH_MESSAGE_PARA structure contains data for hashing messages.
Syntax
typedef struct _CRYPT_HASH_MESSAGE_PARA {
DWORD cbSize;
DWORD dwMsgEncodingType;
HCRYPTPROV_LEGACY hCryptProv;
CRYPT_ALGORITHM_IDENTIFIER HashAlgorithm;
void *pvHashAuxInfo;
} CRYPT_HASH_MESSAGE_PARA, *PCRYPT_HASH_MESSAGE_PARA;
Members
cbSize
Size of this structure in bytes.
dwMsgEncodingType
Type of encoding 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:
X509_ASN_ENCODING | PKCS_7_ASN_ENCODING
Currently defined encoding types are:
- X509_ASN_ENCODING
- PKCS_7_ASN_ENCODING
hCryptProv
This member is not used and should be set to NULL.
Windows Server 2003 and Windows XP: A handle to the cryptographic service provider (CSP) to be used.Unless there is a strong reason for passing in a specific cryptographic provider in hCryptProv, pass zero to use the default RSA or DSS provider.
This member's data type is HCRYPTPROV.
HashAlgorithm
CRYPT_ALGORITHM_IDENTIFIER containing the algorithm for generating the hash of the message.
pvHashAuxInfo
Not currently used, and must be set to NULL.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Header | wincrypt.h |