CertOIDToAlgId

The CertOIDToAlgId function converts the ASN.1 Object Identifier string to the CryptoAPI algorithm identifier (ALG_ID).

#include <wincrypt.h>
DWORD WINAPI CertOIDToAlgId(
  LPCSTR pszObjId     // in
);
 

Parameters

pszObjId

A pointer to the ASN.1 Object Identifier to be converted to an algorithm identifier.

Return Values

Returns zero if there isn't an algorithm identifier corresponding to the Object Identifier string.

Example

// EXAMPLE CODE FOR USING CertOIDToAlgId() to 
// convert the szOID_RSA_RC4 Object Identifier string to an 
// algorithm identifier.

// Set up the variables.
LPCSTR pszObjID = szOID_RSA_RC4; 
DWORD Alg_Id;

Alg_Id = CertOIDToAlgId(pszObjID);

if (Alg_Id == 0) 
   printf("No ALG_ID string correlates to the Object Identifier. \n");
else
   // Print the Alg_Id returned in hex.
   printf("%h", Alg_Id);
 

QuickInfo

  Windows NT: Requires version 4.0 SP3 or later. Available also in IE 3.02 and later.
  Windows: Requires Windows 98 (or Windows 95 with IE 3.02 or later).
  Windows CE: Unsupported.
  Header: Declared in wincrypt.h.
  Import Library: Use crypt32.lib.