first step of v2 final release

crypto/rand/rand_extra/deterministic.c

@@ -0,0 +1,48 @@
+/* Copyright (c) 2016, 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(BORINGSSL_UNSAFE_DETERMINISTIC_MODE)
+
+#include <string.h>
+
+#include <openssl/chacha.h>
+
+#include "../internal.h"
+#include "../fipsmodule/rand/internal.h"
+
+
+/* g_num_calls is the number of calls to |CRYPTO_sysrand| that have occurred.
+ *
+ * This is intentionally not thread-safe. If the fuzzer mode is ever used in a
+ * multi-threaded program, replace this with a thread-local. (A mutex would not
+ * be deterministic.) */
+static uint64_t g_num_calls = 0;
+
+void RAND_reset_for_fuzzing(void) { g_num_calls = 0; }
+
+void CRYPTO_sysrand(uint8_t *out, size_t requested) {
+  static const uint8_t kZeroKey[32];
+
+  uint8_t nonce[12];
+  OPENSSL_memset(nonce, 0, sizeof(nonce));
+  OPENSSL_memcpy(nonce, &g_num_calls, sizeof(g_num_calls));
+
+  OPENSSL_memset(out, 0, requested);
+  CRYPTO_chacha_20(out, out, requested, kZeroKey, nonce, 0);
+  g_num_calls++;
+}
+
+#endif  /* BORINGSSL_UNSAFE_DETERMINISTIC_MODE */