Add support for Fuchsia in crypto/rand.
This change adds the OS-specific routines to get random bytes when using
BoringSSL on Fuchsia. Fuchsia uses the Magenta kernel, which provides
random bytes via a syscall rather than via a file or library function.
Change-Id: I32f858246425309d643d142214c7b8de0c62250a
Reviewed-on: https://boringssl-review.googlesource.com/13140
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/crypto/rand/CMakeLists.txt b/crypto/rand/CMakeLists.txt
index c66d2ee..f7c11f1 100644
--- a/crypto/rand/CMakeLists.txt
+++ b/crypto/rand/CMakeLists.txt
@@ -14,6 +14,7 @@
OBJECT
deterministic.c
+ fuchsia.c
rand.c
urandom.c
windows.c
diff --git a/crypto/rand/fuchsia.c b/crypto/rand/fuchsia.c
new file mode 100644
index 0000000..2e138d0
--- /dev/null
+++ b/crypto/rand/fuchsia.c
@@ -0,0 +1,43 @@
+/* Copyright (c) 2017, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <openssl/rand.h>
+
+#if defined(OPENSSL_FUCHSIA) && !defined(BORINGSSL_UNSAFE_DETERMINISTIC_MODE)
+
+#include <limits.h>
+#include <stdlib.h>
+
+#include <magenta/syscalls.h>
+
+#include "internal.h"
+
+void CRYPTO_sysrand(uint8_t *out, size_t requested) {
+ while (requested > 0) {
+ size_t output_bytes_this_pass = MX_CPRNG_DRAW_MAX_LEN;
+ if (requested < output_bytes_this_pass) {
+ output_bytes_this_pass = requested;
+ }
+ size_t bytes_drawn;
+ mx_status_t status =
+ mx_cprng_draw(out, output_bytes_this_pass, &bytes_drawn);
+ if (status != NO_ERROR) {
+ abort();
+ }
+ requested -= bytes_drawn;
+ out += bytes_drawn;
+ }
+}
+
+#endif /* OPENSSL_FUCHSIA && !BORINGSSL_UNSAFE_DETERMINISTIC_MODE */
diff --git a/include/openssl/base.h b/include/openssl/base.h
index 8c1fd34..3f47521 100644
--- a/include/openssl/base.h
+++ b/include/openssl/base.h
@@ -118,6 +118,10 @@
#define OPENSSL_LINUX
#endif
+#if defined(__Fuchsia__)
+#define OPENSSL_FUCHSIA
+#endif
+
#if defined(TRUSTY)
#define OPENSSL_TRUSTY
#define OPENSSL_NO_THREADS
