1 files changed, 84 insertions, 0 deletions
diff --git a/src/lib/cryptolink/botan_link.cc b/src/lib/cryptolink/botan_link.cc
new file mode 100644
index 0000000..5eb0e34
--- /dev/null
+++ b/src/lib/cryptolink/botan_link.cc
@@ -0,0 +1,84 @@
+// Copyright (C) 2011-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cryptolink/cryptolink.h>
+#include <cryptolink/crypto_hash.h>
+#include <cryptolink/crypto_hmac.h>
+#include <cryptolink/crypto_rng.h>
+
+#include <botan/exceptn.h>
+#include <botan/version.h>
+#include <botan/auto_rng.h>
+
+namespace isc {
+namespace cryptolink {
+
+// For Botan, we use the CryptoLink class object in RAII style
+class CryptoLinkImpl {
+    // empty class
+};
+
+CryptoLink::~CryptoLink() {
+}
+
+/// \brief Botan implementation of RNG.
+class RNGImpl : public RNG {
+public:
+    RNGImpl() {
+        rng.reset(new Botan::AutoSeeded_RNG());
+    }
+
+    ~RNGImpl() {
+    }
+
+private:
+    std::vector<uint8_t> random(size_t len) {
+        std::vector<uint8_t> data;
+        if (len > 0) {
+            data.resize(len);
+            try {
+                rng->randomize(&data[0], len);
+            } catch (const Botan::Exception& ex) {
+                isc_throw(isc::cryptolink::LibraryError,
+                          "Botan error: " << ex.what());
+            }
+        }
+        return (data);
+    }
+
+    boost::shared_ptr<Botan::RandomNumberGenerator> rng;
+};
+
+void
+CryptoLink::initialize(CryptoLink& c) {
+    if (!c.impl_) {
+        try {
+            c.impl_.reset(new CryptoLinkImpl());
+        } catch (const Botan::Exception& ex) {
+            isc_throw(InitializationError, "Botan error: " << ex.what());
+        }
+    }
+    if (!c.rng_) {
+        try {
+            c.rng_.reset(new RNGImpl());
+        } catch (const Botan::Exception& ex) {
+            isc_throw(InitializationError, "Botan error: " << ex.what());
+        }
+    }
+    // A not yet fixed bug makes RNG to be destroyed after memory pool...
+    atexit([]{ getCryptoLink().getRNG().reset(); });
+}
+
+std::string
+CryptoLink::getVersion() {
+    return (Botan::version_string());
+}
+
+} // namespace cryptolink
+} // namespace isc
+