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schannel: use CryptGenRandom for random numbers 

This function is available for every Windows version since Windows 95/NT.

reference:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa379942.aspx
This commit is contained in:
Marcel Raad 2014-07-31 12:59:46 +02:00 committed by Daniel Stenberg
parent 0c23ec232b
commit f8f2188888
2 changed files with 20 additions and 0 deletions
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17
lib/vtls/curl_schannel.c
View File

@ -1215,6 +1215,23 @@ size_t Curl_schannel_version(char *buffer, size_t size)
return size;
}
int Curl_schannel_random(unsigned char *entropy, size_t length)
{
HCRYPTPROV hCryptProv = 0;
if(!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
return 1;
if(!CryptGenRandom(hCryptProv, (DWORD)length, entropy)) {
CryptReleaseContext(hCryptProv, 0UL);
return 1;
}
CryptReleaseContext(hCryptProv, 0UL);
return 0;
}
#ifdef _WIN32_WCE
static CURLcode verify_certificate(struct connectdata *conn, int sockindex)
{

3
lib/vtls/curl_schannel.h
View File

@ -113,6 +113,8 @@ int Curl_schannel_init(void);
void Curl_schannel_cleanup(void);
size_t Curl_schannel_version(char *buffer, size_t size);
int Curl_schannel_random(unsigned char *entropy, size_t length);
/* API setup for Schannel */
#define curlssl_init Curl_schannel_init
#define curlssl_cleanup Curl_schannel_cleanup
@ -129,5 +131,6 @@ size_t Curl_schannel_version(char *buffer, size_t size);
#define curlssl_check_cxn(x) (x=x, -1)
#define curlssl_data_pending Curl_schannel_data_pending
#define CURL_SSL_BACKEND CURLSSLBACKEND_SCHANNEL
#define curlssl_random(x,y,z) Curl_schannel_random(y,z)
#endif /* USE_SCHANNEL */
#endif /* HEADER_CURL_SCHANNEL_H */