Line data    Source code

       1             : /**
       2             :  * The MIT License (MIT)
       3             :  *
       4             :  * Copyright (c) 2021 RSK Labs Ltd
       5             :  *
       6             :  * Permission is hereby granted, free of charge, to any person obtaining a copy
       7             :  * of this software and associated documentation files (the "Software"), to
       8             :  * deal in the Software without restriction, including without limitation the
       9             :  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
      10             :  * sell copies of the Software, and to permit persons to whom the Software is
      11             :  * furnished to do so, subject to the following conditions:
      12             :  *
      13             :  * The above copyright notice and this permission notice shall be included in
      14             :  * all copies or substantial portions of the Software.
      15             :  *
      16             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      17             :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      18             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      19             :  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      20             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      21             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
      22             :  * IN THE SOFTWARE.
      23             :  */
      24             : 
      25             : #include "hal/log.h"
      26             : #include "endian.h"
      27             : #include "hmac_sha512.h"
      28             : 
      29             : #include <mbedtls/md.h>
      30             : 
      31         456 : bool hmac_sha512(uint8_t *out,
      32             :                  const size_t out_length,
      33             :                  const uint8_t *key,
      34             :                  const unsigned int key_length,
      35             :                  const uint8_t *text,
      36             :                  const unsigned int text_length) {
      37             :     mbedtls_md_context_t ctx;
      38             :     int use_hmac;
      39             :     const mbedtls_md_info_t *md_info;
      40             : 
      41         456 :     if (out_length < SHA512_HASH_LENGTH) {
      42             :         LOG("Error: output buffer too small\n");
      43           1 :         return false;
      44             :     }
      45             : 
      46         455 :     mbedtls_md_init(&ctx);
      47         455 :     md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
      48         455 :     if (!md_info) {
      49             :         LOG("Error: SHA-512 not supported\n");
      50           0 :         goto hmac_sha512_error;
      51             :     }
      52             : 
      53         455 :     use_hmac = 1;
      54         455 :     if (mbedtls_md_setup(&ctx, md_info, use_hmac) != 0) {
      55           0 :         goto hmac_sha512_error;
      56             :     }
      57             : 
      58         455 :     if (mbedtls_md_hmac_starts(&ctx, key, key_length) != 0) {
      59           0 :         goto hmac_sha512_error;
      60             :     }
      61             : 
      62         455 :     if (mbedtls_md_hmac_update(&ctx, text, text_length) != 0) {
      63           0 :         goto hmac_sha512_error;
      64             :     }
      65             : 
      66         455 :     if (mbedtls_md_hmac_finish(&ctx, out) != 0) {
      67           0 :         goto hmac_sha512_error;
      68             :     }
      69             : 
      70         455 :     mbedtls_md_free(&ctx);
      71         455 :     return true;
      72             : 
      73           0 : hmac_sha512_error:
      74             :     LOG("Error: failed to compute HMAC-SHA512\n");
      75           0 :     mbedtls_md_free(&ctx);
      76           0 :     return false;
      77             : }