1 // Copyright 2020 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14
15 #include "dice/utils.h"
16
17 #include <stdint.h>
18
DiceHexEncode(const uint8_t * in,size_t num_bytes,void * out,size_t out_size)19 void DiceHexEncode(const uint8_t* in, size_t num_bytes, void* out,
20 size_t out_size) {
21 const uint8_t kHexMap[16] = "0123456789abcdef";
22 size_t in_pos = 0;
23 size_t out_pos = 0;
24 uint8_t* out_bytes = out;
25 for (in_pos = 0; in_pos < num_bytes && out_pos < out_size; ++in_pos) {
26 out_bytes[out_pos++] = kHexMap[(in[in_pos] >> 4)];
27 if (out_pos < out_size) {
28 out_bytes[out_pos++] = kHexMap[in[in_pos] & 0xF];
29 }
30 }
31 }
32