X-Git-Url: http://git.meshlink.io/?p=meshlink;a=blobdiff_plain;f=src%2Fcrypto.c;h=3244a0b4628bdd2e6ddb6f49dbf1a0c30fab17ad;hp=cf000c8a0824f855a1f6e6815603e00500c6ed33;hb=963c5055505f2fc117cd5efa06eaa02c9b2bf85d;hpb=0afa91b3c4f62db18c715e8499368a7c2c9ee5bd

diff --git a/src/crypto.c b/src/crypto.c
index cf000c8a..3244a0b4 100644
--- a/src/crypto.c
+++ b/src/crypto.c
@@ -23,12 +23,19 @@
 
 //TODO: use a strict random source once to seed a PRNG?
 
+#ifndef HAVE_MINGW
+
 static int random_fd = -1;
 
 void crypto_init(void) {
+	assert(random_fd == -1);
+
 	random_fd = open("/dev/urandom", O_RDONLY);
-	if(random_fd < 0)
+
+	if(random_fd < 0) {
 		random_fd = open("/dev/random", O_RDONLY);
+	}
+
 	if(random_fd < 0) {
 		fprintf(stderr, "Could not open source of random numbers: %s\n", strerror(errno));
 		abort();
@@ -36,11 +43,57 @@ void crypto_init(void) {
 }
 
 void crypto_exit(void) {
+	assert(random_fd != -1);
+
+	close(random_fd);
+	random_fd = -1;
+}
+
+void randomize(void *out, size_t outlen) {
+	assert(outlen);
+
+	char *ptr = out;
+
+	while(outlen) {
+		size_t len = read(random_fd, ptr, outlen);
+
+		if(len <= 0) {
+			if(errno == EAGAIN || errno == EINTR) {
+				continue;
+			}
+
+			fprintf(stderr, "Could not read random numbers: %s\n", strerror(errno));
+			abort();
+		}
+
+		ptr += len;
+		outlen -= len;
+	}
+}
+
+#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));
+	assert(outlen);
+
+	if(!CryptGenRandom(prov, outlen, out)) {
+		fprintf(stderr, "CryptGenRandom() failed\n");
 		abort();
 	}
 }
+
+#endif