1 files changed, 59 insertions, 0 deletions
diff --git a/src/lib/crypto/rng.cpp b/src/lib/crypto/rng.cpp
new file mode 100644
index 0000000..bf5bfad
--- /dev/null
+++ b/src/lib/crypto/rng.cpp
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2017-2021, [Ribose Inc](https://www.ribose.com).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *
+ * 2.  Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <botan/ffi.h>
+#include "rng.h"
+#include "types.h"
+
+namespace rnp {
+RNG::RNG(Type type)
+{
+    if (botan_rng_init(&botan_rng, type == Type::DRBG ? "user" : NULL)) {
+        throw rnp::rnp_exception(RNP_ERROR_RNG);
+    }
+}
+
+RNG::~RNG()
+{
+    (void) botan_rng_destroy(botan_rng);
+}
+
+void
+RNG::get(uint8_t *data, size_t len)
+{
+    if (botan_rng_get(botan_rng, data, len)) {
+        // This should never happen
+        throw rnp::rnp_exception(RNP_ERROR_RNG);
+    }
+}
+
+struct botan_rng_struct *
+RNG::handle()
+{
+    return botan_rng;
+}
+} // namespace rnp