src/basic/gcrypt-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #if HAVE_GCRYPT
   4 #include <gcrypt.h>
   5
   6 #include "gcrypt-util.h"
   7 #include "hexdecoct.h"
   8
   9 void initialize_libgcrypt(bool secmem) {
  10         if (gcry_control(GCRYCTL_INITIALIZATION_FINISHED_P))
  11                 return;
  12
  13         assert_se(gcry_check_version("1.4.5"));
  14
  15         /* Turn off "secmem". Clients which wish to make use of this
  16          * feature should initialize the library manually */
  17         if (!secmem)
  18                 gcry_control(GCRYCTL_DISABLE_SECMEM);
  19         gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
  20 }
  21
  22 int string_hashsum(const char *s, size_t len, int md_algorithm, char **out) {
  23         _cleanup_(gcry_md_closep) gcry_md_hd_t md = NULL;
  24         size_t hash_size;
  25         void *hash;
  26         char *enc;
  27
  28         initialize_libgcrypt(false);
  29
  30         hash_size = gcry_md_get_algo_dlen(md_algorithm);
  31         assert(hash_size > 0);
  32
  33         gcry_md_open(&md, md_algorithm, 0);
  34         if (!md)
  35                 return -EIO;
  36
  37         gcry_md_write(md, s, len);
  38
  39         hash = gcry_md_read(md, 0);
  40         if (!hash)
  41                 return -EIO;
  42
  43         enc = hexmem(hash, hash_size);
  44         if (!enc)
  45                 return -ENOMEM;
  46
  47         *out = enc;
  48         return 0;
  49 }
  50 #endif