CryptAcquireContext(&hProvParty1,NULL,MS_ENH_DSS_DH_PROV,PROV_DSS_DH,CRYPT_VERIFYCONTEXT);

    CryptGenKey(hProvParty1,CALG_DH_EPHEM,DHKEYSIZE << 16 | CRYPT_EXPORTABLE | CRYPT_PREGEN,&hPrivateKey1);

CryptExportKey(hPrivateKey1, 0, PUBLICKEYBLOB, 0, pbKeyBlob1, &dwDataLen1);

fReturn = CryptImportKey(hProvParty1,temp2,272,hPrivateKey1,0,&hSessionKey2);

if(CryptExportKey(hSessionKey2,hSessionKey2exp,PRIVATEKEYBLOB,0,NULL,&dwDataLenExp))