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         454 : bool hmac_sha512(uint8_t *out,
      32             :                  const uint8_t *key,
      33             :                  const unsigned int key_length,
      34             :                  const uint8_t *text,
      35             :                  const unsigned int text_length) {
      36             :     mbedtls_md_context_t ctx;
      37             :     int use_hmac;
      38             :     const mbedtls_md_info_t *md_info;
      39             : 
      40         454 :     mbedtls_md_init(&ctx);
      41         454 :     md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
      42         454 :     if (!md_info) {
      43             :         LOG("Error: SHA-512 not supported\n");
      44           0 :         goto hmac_sha512_error;
      45             :     }
      46             : 
      47         454 :     use_hmac = 1;
      48         454 :     if (mbedtls_md_setup(&ctx, md_info, use_hmac) != 0) {
      49           0 :         goto hmac_sha512_error;
      50             :     }
      51             : 
      52         454 :     if (mbedtls_md_hmac_starts(&ctx, key, key_length) != 0) {
      53           0 :         goto hmac_sha512_error;
      54             :     }
      55             : 
      56         454 :     if (mbedtls_md_hmac_update(&ctx, text, text_length) != 0) {
      57           0 :         goto hmac_sha512_error;
      58             :     }
      59             : 
      60         454 :     if (mbedtls_md_hmac_finish(&ctx, out) != 0) {
      61           0 :         goto hmac_sha512_error;
      62             :     }
      63             : 
      64         454 :     mbedtls_md_free(&ctx);
      65         454 :     return true;
      66             : 
      67           0 : hmac_sha512_error:
      68             :     LOG("Error: failed to compute HMAC-SHA512\n");
      69           0 :     mbedtls_md_free(&ctx);
      70           0 :     return false;
      71             : }