Now it calls CryptGenRandom() if is it compiled for windows. It might be possible to save the cryptographic provider in between invocations, e.g. by making it static -- I have no idea how computationally intensive that operation actually is.
Signed-off-by: Geert Martin Ijewski <gm.ijew...@web.de> diff --git a/crypto/random-platform.c b/crypto/random-platform.c index 82b755a..7aa0476 100644 --- a/crypto/random-platform.c +++ b/crypto/random-platform.c @@ -26,6 +26,7 @@ int qcrypto_random_bytes(uint8_t *buf G_GNUC_UNUSED, size_t buflen G_GNUC_UNUSED, Error **errp) { +#ifndef _WIN32 int fd; int ret = -1; int got; @@ -61,4 +62,26 @@ int qcrypto_random_bytes(uint8_t *buf G_GNUC_UNUSED, cleanup: close(fd); return ret; +#else + HCRYPTPROV hCryptProv; + + if (!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0)) { + if (NTE_BAD_KEYSET == GetLastError()) { + if (!CryptAcquireContext(&hCryptProv, NULL, NULL, + PROV_RSA_FULL, CRYPT_NEWKEYSET)) { + error_setg_errno(errp, GetLastError(), + "Unable to create cryptographic provider"); + } + } + } + + if (!CryptGenRandom(hCryptProv, buflen, buf)) { + error_setg_errno(errp, GetLastError(), + "Unable to read random bytes"); + return -1; + } + + CryptReleaseContext(hCryptProv, 0); + return 0; +#endif } diff --git a/include/sysemu/os-win32.h b/include/sysemu/os-win32.h index ff18b23..4a5d908 100644 --- a/include/sysemu/os-win32.h +++ b/include/sysemu/os-win32.h @@ -29,6 +29,7 @@ #include <winsock2.h> #include <windows.h> #include <ws2tcpip.h> +#include <Wincrypt.h> #if defined(_WIN64) /* On w64, setjmp is implemented by _setjmp which needs a second parameter.