src/basic/gcrypt-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 /***
   4   Copyright 2012 Lennart Poettering
   5 ***/
   6
   7 #if HAVE_GCRYPT
   8 #include <gcrypt.h>
   9
  10 #include "gcrypt-util.h"
  11 #include "hexdecoct.h"
  12
  13 void initialize_libgcrypt(bool secmem) {
  14         const char *p;
  15         if (gcry_control(GCRYCTL_INITIALIZATION_FINISHED_P))
  16                 return;
  17
  18         p = gcry_check_version("1.4.5");
  19         assert(p);
  20
  21         /* Turn off "secmem". Clients which wish to make use of this
  22          * feature should initialize the library manually */
  23         if (!secmem)
  24                 gcry_control(GCRYCTL_DISABLE_SECMEM);
  25         gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
  26 }
  27
  28 int string_hashsum(const char *s, size_t len, int md_algorithm, char **out) {
  29         _cleanup_(gcry_md_closep) gcry_md_hd_t md = NULL;
  30         size_t hash_size;
  31         void *hash;
  32         char *enc;
  33
  34         initialize_libgcrypt(false);
  35
  36         hash_size = gcry_md_get_algo_dlen(md_algorithm);
  37         assert(hash_size > 0);
  38
  39         gcry_md_open(&md, md_algorithm, 0);
  40         if (!md)
  41                 return -EIO;
  42
  43         gcry_md_write(md, s, len);
  44
  45         hash = gcry_md_read(md, 0);
  46         if (!hash)
  47                 return -EIO;
  48
  49         enc = hexmem(hash, hash_size);
  50         if (!enc)
  51                 return -ENOMEM;
  52
  53         *out = enc;
  54         return 0;
  55 }
  56 #endif