PROPID_M_HASH_ALG

The PROPID_M_HASH_ALG property identifies the hashing algorithm used when authenticating messages.

Type Indicator

VT_UI4

PROPVARIANT Field

ulVal

Property Values

This property can be set to any of the values defined by the ALG_ID data type in wincrypt.h (the default is CALG_MD5).

Remarks

The MSMQ run-time DLL on the source computer uses the hashing algorithm when creating a digital signature for a message. The target Queue Manger then uses the same hashing algorithm to authenticate the message when it is received.

When passing PROPID_M_HASH_ALG to MQReceiveMessage, the corresponding VT field in the aPropVar array can be set to VT_NULL.

For information on what MSMQ does to authenticate messages, see How MSMQ Authenticates Messages.

QuickInfo

  Windows NT: Requires version 4.0 SP3 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in mq.h.
  Import Library: Use mqrt.lib.
  Unicode: Defined only as Unicode.