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List:       ms-cryptoapi
Subject:    Re: Where is CertStrToName (it wasn't there)
From:       Jean Renard Ward <jrward () WORLD ! STD ! COM>
Date:       1999-01-18 15:04:02
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We had the same problem, and concluded that the function was just missing.

We wrote our own equivalent function:

Here is the source code -- it uses a couple of in-house string classes, but you might \
be able to implement your own, using it as a guide.


#if !defined _WIN32_WINNT
#define _WIN32_WINNT 0x0400
#endif

// ----- includes  ------------------------------------------------------------

#include "WinWarnDisable.h" // suppress Level-4 warnings in Microsoft slop
#include <windows.h>    // For IsBadStringPtr(...)
#include "WinWarnDefault.h"
#include <stdio.h>
#include <time.h>
#include "EXTENDEDassert.h"
#include "macros.h"
#include "LcpStatExc.h"
#include "asn1.h"
#include "util.h"
#include "CryptoUtils.h"
#include "CertUtils.h"

// ----- functions ------------------------------------------------------------

// ----------------------------------------------------------------------------
// SimpleCertStrToName - Simple substitute for the CertStrToName function in
//  older (IE3.02) environments. Takes a parameter in the form 'CN=<common name>'
//  For simplicity the function skips everything until the first '=' and
//  treats the given string _always_ as a common name.
//  As characters are only alphanumeric chars and ' ' (blank), '_' (underscore)
//  and '=' (equal sign) allowed.
//
// Simple ASN1 encoding for name:
//
// SEQUENCE
// {
//      SET
//      {
//          SEQUENCE
//          {
//              OBJECT IDENTIFIER
//              ANY
//          }
//          ...
//      }
//      ...
// }
//
//
// ----------------------------------------------------------------------------
lcp_status_t
SimpleCertStrToName(const TCHAR*    CommonName,
                    COctetString&   osEncName)
{
    bool    fAlphaCharFound = false;
    TCHAR*  pTc = (TCHAR*)CommonName;

    BYTE oid_CN[]   = { OID_COMMON_NAME };
    int len         = 0;

    // -- sanity check
    if(NULL == pTc || 0 == (len = (int) _tcslen(pTc)))
        return LCP_E_BAD_ARG;

    // -- spell check
    for(int i=0; i<len; i++)
    {
        TCHAR c = pTc[i];

        // .. check for alphanumeric chars first ..
        if(
                (c >= _T('A') && c <= _T('Z'))
            ||  (c >= _T('a') && c <= _T('z'))
            ||  (c >= _T('0') && c <= _T('9'))
            )
        {
            fAlphaCharFound = true;
            continue;
        }

        // .. otherwise for the allowed special chars ..

        if( !(
                c == _T(' ')
            ||  c == _T('.')
            ||  c == _T('/')
            ||  c == _T('(')
            ||  c == _T(')')
            ||  c == _T('+')
            ||  c == _T('-')
            ||  c == _T('=')
            )
        )
        return LCP_E_BAD_ARG;
    }

    // -- skip leading white spaces
    while(pTc[i] == _T(' ') || pTc[i] == _T('\t'))
        pTc++;

    // .. adjust length ..
    len = _tcslen(pTc);
    if(0 == len) return LCP_E_BAD_ARG;

    // -- remove the CN= part ...

    // .. search for '=' ..
    pTc = _tcschr(CommonName, _T('='));
    if(NULL != pTc)
    {
        pTc++;              // skip '='
        len = _tcslen(pTc); // adjust length
        if(0 == len) return LCP_E_BAD_ARG;

        // .. skip leading white spaces ..
        while(*pTc == _T(' ') || *pTc == _T('\t'))
            pTc++;

        // .. adjust length ..
        len = _tcslen(pTc);
        if(0 == len) return LCP_E_BAD_ARG;
    }
    else
        pTc = (TCHAR*)CommonName;   // no '=' found

    COctetString osOidCN(sizeof(oid_CN), oid_CN);
    COctetString osName(len*sizeof(TCHAR), (BYTE*)pTc);

    osEncName = SEQUENCE(SET(SEQUENCE(osOidCN + PrintableString(osName))));

    return LCP_S_OK;
}


"McCarthy, James (NZ)" wrote:
> 
> According to Microsoft's documentation, CertStrToName is available under NT
> SP3 or IE 3.02.  I have IE 3.02 installed on a NT SP3 machine but the
> version of crypt32.dll I have does not have this method in it
> (CertNameToString is present though).  The version number of crypt32.dll is
> 4.
> 
> Does anyone have any information about this?  Do we have to reload SP3 after
> installing IE 3.02?
> 
> Thanks,
> 
> Jim

--
=============================================================
Jean Renard Ward                   "My comments  reflect only
mailto:jrward@gmx.de                my own ignorance, and not
mailto:jrward@alum.mit.edu           necessarily that of my
mailto:JeanRenard.Ward@sbs.siemens.com  current employer."
http://www.erols.com/rwservices           Boston, USA
=============================================================

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