Add a random number generator.

1 files changed, 35 insertions, 0 deletions

diff --git a/src/random/libwebidoidc-random.c b/src/random/libwebidoidc-random.c
new file mode 100644
index 0000000..2bea9bb
--- /dev/null
+++ b/src/random/libwebidoidc-random.c
@@ -0,0 +1,35 @@
+#include <utilities.h>
+#include <threads.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <webid-oidc/random.h>
+
+#define _(s) dgettext (PACKAGE, s)
+
+/* Register "random", a guile function to generate random data. */
+void init_webidoidc_random (void);
+
+SCM_DEFINE (webidoidc_random_g, "random", 1, 0, 0, (SCM length),
+	    "Get @var{length} random bytes, and encode them in a base64-url string.")
+{
+  size_t c_length = scm_to_size_t (length);
+  uint8_t *data = scm_gc_malloc_pointerless (c_length, "random data");
+  webid_oidc_random (c_length, data);
+  return wrap_bytevector (c_length, data);
+}
+
+SCM_DEFINE (webidoidc_random_init_g, "random-init!", 0, 0, 0, (void),
+	    "Re-initialize the random number generator so that future threads are not predictable.")
+{
+  webid_oidc_random_init ();
+  return SCM_UNDEFINED;
+}
+
+void
+init_webidoidc_random (void)
+{
+  webid_oidc_random_init ();
+#ifndef SCM_MAGIC_SNARFER
+#include "libwebidoidc-random.x"
+#endif /* not SCM_MAGIC_SNARFER */
+}