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List:       ms-cryptoapi
Subject:    R: Problem with low-level functions (hash data file)
From:       "Carucci, Giuseppe (Olivettiricerca)"
Date:       2000-09-12 9:29:58
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In my previous mail (see below), the error returned by CryptMsgOpenToEncode 
function is not (excuse me) CRYPT_E_MSG_ERROR, but CRYPT_E_UNKNOW_ALGO!

I suppose that the problem is the hash algorithm (szOID_RSA_SHA1RSA) because
with szOID_RSA_MD5 the function CryptMsgOpenToEncode returns OK.
But the stream callback function is not called by CryptMsgUpdate; then I
have not generated 
a hashed file (attached mode).

How I can do to use the SHA1 hash algorithm !? Why the callback is not
called !?
I will precise that a callback is used in my program to sign file (attached
mode) and functions 
correctly! With CMSG_HASHED flag I can't to use the stream callback!!?

Thanks in advance.

Carucci Giuseppe
Olivetti Ricerca SCpA (Getronics Group)
tel. 0806352056

Contrada La Marchesa - SS 271  KM 8,3 
70020 Bitritto (BA)
mail: Giuseppe.Carucci@getronics.com

                                     ///
                                     (. .)
---------------------------------oOO--(_)--OOo----------------------


> -----Messaggio originale-----
> Da:   Carucci, Giuseppe (Olivettiricerca)
> [SMTP:Giuseppe.Carucci@GETRONICS.COM]
> Inviato:      marted́ 12 settembre 2000 10.19
> A:    CryptoAPI@DISCUSS.MICROSOFT.COM
> Oggetto:      Problem with low-level functions (hash data file)
> 
> I am using low-level functions with streaming (to read a file) to encode
> and
> to hash data (attached mode).
> 
> I have implemented the hash with  low-level API (CryptMsgOpenToEncode,
> CryptMsgUpdate, etc) and a callback function to write a file that contains
> the data and digest in PKCS#7 format; but when I call CryptMsgOpenToEncode
> I have the error CRYPT_E_MSG_ERROR (you can see my code below).
> 
> I call CryptAcquireContext to get a handle to a provider.
> Is this necessary? Or I can to pass the value 0 to
> HashedEncodeInfo.hCryptProv?
> 
> Is there an incorrect parameter? Or where is the problem?
> 
> Thanks in advance.
> 
>         // Get a handle to a cryptographic provider.
>         ....
>         CryptAcquireContext(&phProv, NULL, NULL, PROV_RSA_FULL,
> CRYPT_VERIFYCONTEXT)
>         ....
> 
>         // Initialize the algorithm identifier structure.
>         ....
>         HashAlgorithm.pszObjId = szOID_RSA_SHA1RSA;
>         ....
> 
>         // Initialize the CMSG_HASHED_ENCODE_INFO structure.
>         HashedEncodeInfo.hCryptProv = phProv;
>         HashedEncodeInfo.HashAlgorithm = HashAlgorithm;
>         HashedEncodeInfo.pvHashAuxInfo = NULL;
> 
>         // Input file
>         hInFile = CreateFile(...);
>         // Output file, containing your hashed data (in a PKCS7 format)
>       hOutFile = CreateFile(...);
> 
>         ....
> 
>         // fill the StreamInfo struct
>         StreamInfo.cbContent = dwInFileLen;
>         StreamInfo.pfnStreamOutput = &StreamCallback;
>         StreamInfo.pvArg = &hOutFile;
> 
>         // Open a message for encoding mode attach or detach
>         hMsg = CryptMsgOpenToEncode(
>            ENCODING_TYPE,      // Encoding type.
>            0,               // Flags.
>            CMSG_HASHED,           // message type.
>            &HashedEncodeInfo,  // Pointer to structure
>            NULL,                  // Inner content OID.
>            &StreamInfo);          // Stream information.
>         if (hMsg == NULL)
>         {
>                 .........................................
>                 .........................................
>                 My error is : CRYPT_E_MSG_ERROR
>                 .........................................
>                 .........................................
>         }
> 
>         ....
> 
> 
> Carucci Giuseppe
> Olivetti Ricerca SCpA (Getronics Group)
> tel. 0806352056
> 
> Contrada La Marchesa - SS 271  KM 8,3
> 70020 Bitritto (BA)
> mail: Giuseppe.Carucci@getronics.com
> 
>                                      ///
>                                      (. .)
> ---------------------------------oOO--(_)--OOo----------------------
> 
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