1 files changed, 68 insertions, 0 deletions
diff --git a/src/lib/crypto/mem.cpp b/src/lib/crypto/mem.cpp
new file mode 100644
index 0000000..bf54aa6
--- /dev/null
+++ b/src/lib/crypto/mem.cpp
@@ -0,0 +1,68 @@
+/*-
+ * Copyright (c) 2021 Ribose Inc.
+ * 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 HOLDERS 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 <cstdio>
+#include "mem.h"
+#include "logging.h"
+#include <botan/ffi.h>
+
+void
+secure_clear(void *vp, size_t size)
+{
+    botan_scrub_mem(vp, size);
+}
+
+namespace rnp {
+
+bool
+hex_encode(const uint8_t *buf, size_t buf_len, char *hex, size_t hex_len, hex_format_t format)
+{
+    uint32_t flags = format == HEX_LOWERCASE ? BOTAN_FFI_HEX_LOWER_CASE : 0;
+
+    if (hex_len < (buf_len * 2 + 1)) {
+        return false;
+    }
+    hex[buf_len * 2] = '\0';
+    return botan_hex_encode(buf, buf_len, hex, flags) == 0;
+}
+
+size_t
+hex_decode(const char *hex, uint8_t *buf, size_t buf_len)
+{
+    size_t hexlen = strlen(hex);
+
+    /* check for 0x prefix */
+    if ((hexlen >= 2) && (hex[0] == '0') && ((hex[1] == 'x') || (hex[1] == 'X'))) {
+        hex += 2;
+        hexlen -= 2;
+    }
+    if (botan_hex_decode(hex, hexlen, buf, &buf_len) != 0) {
+        RNP_LOG("Hex decode failed on string: %s", hex);
+        return 0;
+    }
+    return buf_len;
+}
+} // namespace rnp
+\ No newline at end of file