1 files changed, 31 insertions, 0 deletions
diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..4ba1bce
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,31 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#include "dice/utils.h"
+
+#include <stdint.h>
+
+void DiceHexEncode(const uint8_t* in, size_t num_bytes, void* out,
+                   size_t out_size) {
+  const uint8_t kHexMap[16] = "0123456789abcdef";
+  size_t in_pos = 0;
+  size_t out_pos = 0;
+  uint8_t* out_bytes = out;
+  for (in_pos = 0; in_pos < num_bytes && out_pos < out_size; ++in_pos) {
+    out_bytes[out_pos++] = kHexMap[(in[in_pos] >> 4)];
+    if (out_pos < out_size) {
+      out_bytes[out_pos++] = kHexMap[in[in_pos] & 0xF];
+    }
+  }
+}