Re: compilation of ms crypto api program
From: Ashok (ashokraj36_at_yahoo.com)
Date: 06/23/03
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Date: 22 Jun 2003 22:15:29 -0700
"Sisyphus" <kalinabears@hdc.com.au> wrote in message news:<3ef1aed1$0$32365@echo-01.iinet.net.au>...
> "Ashok" <ashokraj36@yahoo.com> wrote in message
> news:548b67bf.0306182221.2e9c5d70@posting.google.com...
> > Dear Group,
> >
> > I am a newbie to Crypto programming, I tried compiling following
> > program using MS VC++ 6.0 on windows2000-sp3+windows high encryption
> > pack. but my compilation is not successful, and got about 18 erros,
> > can any one help me resolve the same
> >
> > Thanks in advance,
> > Ashok
> >
> > -----------------------------
> > program .......
> >
> >
> >
> > # include <wincrypt.h>
> > # include <winerror.h>
> > # include <stdio.h>
> > # include <windows.h>
> >
> > const OUT_BUFFER_SIZE = 2048+64; // extra padding
> > const IN_BUFFER_SIZE = 2048;
> >
> > void main(int argc, char * argv[])
> > {
> > HANDLE hInFile, hOutFile;
> > BYTE pbBuffer[2048+64];//OUT_BUFFER_SIZE];
> >
> > BOOL finished;
> > HCRYPTPROV hProvider = 0;
> > HCRYPTKEY hKey = 0;
> > HCRYPTKEY hExchangeKey = 0;
> > DWORD dwByteCount, dwBytesWritten;
> >
> > if (argc != 3) {
> > printf("Usage: ENCRYPT infile outfile\n");
> > exit(0);
> > }
> >
> > // Get handle for the default provider (use RSA encryption).
> > CryptAcquireContext(&hProvider, NULL, NULL, PROV_DSS_DH, 0);
> >
> > // Open infile and create outfile.
> > HInFile = CreateFile(argv[1], GENERIC_READ, FILE_SHARE_READ,
> > NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
> > hOutFile = CreateFile(argv[2], GENERIC_WRITE, FILE_SHARE_READ,
> > NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
> >
> >
> > // Generate a random key (in "simple blob" format).
> > CryptGetUserKey(hProvider, AT_KEYEXCHANGE, &hExchangeKey);
> > CryptGenKey(hProvider, CALG_RC2, CRYPT_EXPORTABLE, &hKey);
> >
> > // The first call to ExportKey with NULL gets the key size.
> > dwByteCount=0;
> > CryptExportKey(hKey, hExchangeKey, SIMPLEBLOB, 0, NULL,
> > &dwByteCount);
> > CryptExportKey(hKey, hExchangeKey, SIMPLEBLOB, 0, pbBuffer,
> > &dwByteCount);
> >
> > // Write size of key blob, then key blob itself, to output
> > file.
> > WriteFile(hOutFile, &dwByteCount, sizeof(dwByteCount),
> > &dwBytesWritten, NULL);
> > WriteFile(hOutFile, pbBuffer, dwByteCount, &dwBytesWritten,
> > NULL);
> >
> > // Now, read data in, encrypt it, and write encrypted data to
> > output.
> > do
> > {
> > ReadFile(hInFile, pbBuffer,
> > IN_BUFFER_SIZE,&dwByteCount,NULL);
> > finished = (dwByteCount < IN_BUFFER_SIZE);
> > CryptEncrypt(hKey, 0, finished, 0, pbBuffer,
> > &dwByteCount, OUT_BUFFER_SIZE);
> > WriteFile(hOutFile, pbBuffer, dwByteCount,
> > &dwBytesWritten, NULL);
> > } while (!finished);
> >
> > // Clean up: release handles, close files.
> > CryptDestroyKey(hKey);
> > CryptDestroyKey(hExchangeKey);
> >
> > CryptReleaseContext(hProvider, 0);
> > CloseHandle(hInFile);
> > CloseHandle(hOutFile);
> > return(0);
> > }
> > -----------------------------------------
> >
> > Errors .............
> >
> > --------------------Configuration: Cpp1 - Win32
> > Debug--------------------
> > Compiling...
> > Cpp1.c
> > D:\PSR\MSVC\Cpp1.c(16) : error C2065: 'HCRYPTPROV' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(16) : error C2146: syntax error : missing ';'
> > before identifier 'hProvider'
> > D:\PSR\MSVC\Cpp1.c(16) : error C2065: 'hProvider' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(17) : error C2065: 'HCRYPTKEY' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(17) : error C2146: syntax error : missing ';'
> > before identifier 'hKey'
> > D:\PSR\MSVC\Cpp1.c(17) : error C2065: 'hKey' : undeclared identifier
> > D:\PSR\MSVC\Cpp1.c(18) : error C2146: syntax error : missing ';'
> > before identifier 'hExchangeKey'
> > D:\PSR\MSVC\Cpp1.c(18) : error C2065: 'hExchangeKey' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(19) : error C2275: 'DWORD' : illegal use of this
> > type as an expression
> > d:\program files\microsoft visual
> > studio\vc98\include\windef.h(141) : see declaration of 'DWORD'
> > D:\PSR\MSVC\Cpp1.c(19) : error C2146: syntax error : missing ';'
> > before identifier 'dwByteCount'
> > D:\PSR\MSVC\Cpp1.c(19) : error C2065: 'dwByteCount' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(19) : error C2065: 'dwBytesWritten' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(27) : warning C4013: 'CryptAcquireContext'
> > undefined; assuming extern returning int
> > D:\PSR\MSVC\Cpp1.c(27) : error C2065: 'PROV_DSS_DH' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(30) : error C2065: 'HInFile' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(30) : warning C4047: '=' : 'int ' differs in levels
> > of indirection from 'void *'
> > D:\PSR\MSVC\Cpp1.c(35) : warning C4013: 'CryptGetUserKey' undefined;
> > assuming extern returning int
> > D:\PSR\MSVC\Cpp1.c(35) : error C2065: 'AT_KEYEXCHANGE' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(36) : warning C4013: 'CryptGenKey' undefined;
> > assuming extern returning int
> > D:\PSR\MSVC\Cpp1.c(36) : error C2065: 'CALG_RC2' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(36) : error C2065: 'CRYPT_EXPORTABLE' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(40) : warning C4013: 'CryptExportKey' undefined;
> > assuming extern returning int
> > D:\PSR\MSVC\Cpp1.c(40) : error C2065: 'SIMPLEBLOB' : undeclared
> > identifier
> > D:\PSR\MSVC\Cpp1.c(52) : warning C4013: 'CryptEncrypt' undefined;
> > assuming extern returning int
> > D:\PSR\MSVC\Cpp1.c(57) : warning C4013: 'CryptDestroyKey' undefined;
> > assuming extern returning int
> > D:\PSR\MSVC\Cpp1.c(60) : warning C4013: 'CryptReleaseContext'
> > undefined; assuming extern returning int
> > D:\PSR\MSVC\Cpp1.c(63) : warning C4098: 'main' : 'void' function
> > returning a value
> > Error executing cl.exe.
> >
> > Cpp1.obj - 18 error(s), 9 warning(s)
> >
> >
> > --------------------------------------------------------------------------
> ----
>
> Hi,
>
> These are C programming issues and, as such, have nothing to do with this
> newsgroup.
>
> Anyway :-) ........
>
> 'main()' should not return a value (because you have specified void) - so
> delete "return(0);" at the end.
>
> If you:
> # include "\your_path_to\ATL\SRC\STDAFX.H"
> the typedefs in wincrypt.h are not ignored and most of those errors
> disappear.
>
> Somewhere in there you wrote 'hInFile' as 'HInFile'. You need to correct
> that typo.
>
> There was also a couple of instances where comments extended onto the next
> line - probably just a case of wrapping - but if you're source contains
> those same errors then you'll need to correct them.
>
> After that I found it at least compiled, though 'encrypt infile outfile'
> merely copied infile to outfile (no sign of encryption).
> Haven't looked at reasons for that - maybe it's because I haven't got the
> "windows high encryption pack".
>
> Hth.
>
> Cheers,
> Rob
Dear Rob
This is a very valuable suggestion... this worked and now program is
successful and I could encrypt target file.
Thanks a lot
Ashok
- Next message: David Wagner: "Re: Can we obtain securer data encryption if we encrypt the data once more?"
- Previous message: Scott Fluhrer: "Re: A new public key algorithm based on avalanche properties"
- In reply to: Sisyphus: "Re: compilation of ms crypto api program"
- Next in thread: Russ Lyttle: "Re: compilation of ms crypto api program"
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