From 7db92fb1932065e40cd4709989e429fca2d49778 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@meshlink.io>
Date: Sun, 25 May 2014 16:26:37 +0200
Subject: [PATCH] Use CryptGenRandom() instead of /dev/[u]random on Windows.

---
 src/crypto.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/crypto.c b/src/crypto.c
index cf000c8a..2e2fa538 100644
--- a/src/crypto.c
+++ b/src/crypto.c
@@ -23,6 +23,8 @@
 
 //TODO: use a strict random source once to seed a PRNG?
 
+#ifndef HAVE_MINGW
+
 static int random_fd = -1;
 
 void crypto_init(void) {
@@ -36,11 +38,30 @@ void crypto_init(void) {
 }
 
 void crypto_exit(void) {
+	close(random_fd);
+}
+
+#else
+
+#include <wincrypt.h>
+HCRYPTPROV prov;
+
+void crypto_init(void) {
+	if(!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
+		fprintf(stderr, "CryptAcquireContext() failed!\n");
+		abort();
+	}
+}
+
+void crypto_exit(void) {
+	CryptReleaseContext(prov, 0);
 }
 
 void randomize(void *out, size_t outlen) {
-	if(read(random_fd, out, outlen) != outlen) {
-		fprintf(stderr, "Error reading random numbers: %s\n", strerror(errno));
+	if(!CryptGenRandom(prov, outlen, out)) {
+		fprintf(stderr, "CryptGenRandom() failed\n");
 		abort();
 	}
 }
+
+#endif
-- 
2.39.5