//TODO: use a strict random source once to seed a PRNG?
+#ifndef HAVE_MINGW
+
static int random_fd = -1;
void crypto_init(void) {
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();
}
void crypto_exit(void) {
+ close(random_fd);
+}
+
+void randomize(void *out, size_t 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));
+ if(!CryptGenRandom(prov, outlen, out)) {
+ fprintf(stderr, "CryptGenRandom() failed\n");
abort();
}
}
+
+#endif