msgPara.pvGetArg = (void *)pCert;

PCCERT_CONTEXT my_CryptGetSignerCertificateCallback_function(void *pvGetArg,DWORD dwCertEncodingType,PCERT_INFO pSignerId,HCERTSTORE hMsgCertStore)
{
	return (PCCERT_CONTEXT)pvGetArg;
}

int main(int argc, char* argv[])
{
 
	HCERTSTORE hCMSCertStore = NULL;
	PCCERT_CONTEXT pCert = NULL;

	DWORD i = 1,c,j=0,k;
	DWORD cbContent = 0;
	BYTE signature[128];
	BYTE hexSig[64];
	BYTE * pbContent1;
	const BYTE * pbContent;

	FILE * inFile, * f = fopen("signed-data.txt","r");


	if( f == NULL )
	{
		puts("file not found");
		exit( EXIT_FAILURE );
	}

	while ( fgetc(f) != EOF )
		++cbContent;

	if( fseek(f,0,SEEK_SET) != 0 )
	{
		puts("fseek failed");
		fclose(f);
		f = fopen("signed-data.txt","r");
		if( f == NULL )
		{
			puts("file not found");
			return -1;
		}
	}
	pbContent1 = (BYTE *)malloc(cbContent+1);
	for( i = 0; i < cbContent; ++i )
		pbContent1[i] = (BYTE)fgetc(f);
	pbContent = pbContent1;
	
	hCMSCertStore = CertOpenStore(CERT_STORE_PROV_FILENAME_A,CODE_TYPE,0,0,"CMS.p7b");
	if(hCMSCertStore == NULL)
	{
		puts("store not open");
		exit( EXIT_FAILURE );
	}

	doPure = TRUE;
	output = fopen("out","w+");
	if( !readGlobalConfig( "" ) )
	{
		puts("error readGlobalConfig");
		exit( EXIT_FAILURE );
	}
	if( ( inFile = fopen( "CMS.p7b", "rb" ) ) == NULL )
	{
		puts("error fopen");
		exit( EXIT_FAILURE );
	}
	
	fseek( inFile, 0, SEEK_SET );
	printAsn1( inFile, 0, LENGTH_MAGIC, 0 );
	fclose( inFile );
	fclose(output);

	output = fopen("out","r");
	fseek(output,-1*(33+64*4),SEEK_END);
	
	while( ( c = fgetc(output) ) != EOF )
	{
		if( c == ' ' || c == '\n' || c == '}' )
			continue;
		signature[j] = (BYTE)c;
		++j;
	}

	for ( i = 0, k = 0 ; i < 64; ++i )
	{
		for ( j = 0 ; j < 2; ++j, ++k )
		{
			if( signature[k] >= 'A' && signature[k] <= 'F' )
				c = (int)signature[k] - 'A'+10;
			else if ( signature[k] >= '0' && signature[k] <= '9' )
				c = (int)signature[k] - '0';

			if( j == 0 )
				hexSig[i] = (BYTE)c*0x10;
			else
				hexSig[i] += (BYTE)c;
		}
	}

	DWORD cSig=64;

	CRYPT_VERIFY_MESSAGE_PARA msgPara;

	while( ( pCert = CertFindCertificateInStore(hCMSCertStore,CODE_TYPE,1,CERT_FIND_ANY,NULL,pCert) ) != NULL )
	{
		ZeroMemory(&msgPara, sizeof(msgPara)); 
		msgPara.cbSize = sizeof(CRYPT_VERIFY_MESSAGE_PARA);
		msgPara.dwMsgAndCertEncodingType = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING;
		msgPara.hCryptProv = NULL;//hCryptProv;
		msgPara.pfnGetSignerCertificate = NULL;//&my_CryptGetSignerCertificateCallback_function;
		msgPara.pvGetArg = (void *)pCert;

		if( !CryptVerifyDetachedMessageSignature(&msgPara,1,hexSig,cSig,1,&pbContent,&cbContent,NULL) )
		{
			printf("%x\n",GetLastError());
		}
		
	}
    

	if( !CertFreeCertificateContext(pCert) )
		puts("Certificate not cleaned");

	if( !CertCloseStore(hCMSCertStore,CERT_CLOSE_STORE_CHECK_FLAG) )
		puts("Store not closed");


	printf("\nHello World!\n");
	fclose(f);
	return 0;
}

msgPara.pvGetArg = (void *)pCert;

PCCERT_CONTEXT WINAPI my_callback_function(void *pvGetArg,DWORD dwCertEncodingType,PCERT_INFO pSignerId,HCERTSTORE hMsgCertStore)
{
	return (PCCERT_CONTEXT)pvGetArg;
}

...

msgPara.pfnGetSignerCertificate = my_callback_function; //функция-callback
msgPara.pvGetArg = (void *)pCert; /* сертификат. Его я получаю из сертификата до callback самстоятельно, т.к. мне необходимо проверить ЭЦП сообщения по всем сертификатам из p7b-файла.*/