CryptAcquireContext(&crypt_prov, NULL, NULL,
PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
if (!CryptGenRandom(crypt_prov, n, buffer)) {
CryptAcquireContext(&crypt_prov, NULL, NULL,
PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
if (!CryptGenRandom(crypt_prov, n, buffer)) {