src/TortoisePlink/crypto/aesgcm-select.c

   1 #include "ssh.h"
   2 #include "aesgcm.h"
   3
   4 static ssh2_mac *aesgcm_mac_selector_new(const ssh2_macalg *alg,
   5                                          ssh_cipher *cipher)
   6 {
   7     static const ssh2_macalg *const real_algs[] = {
   8 #if HAVE_CLMUL
   9         &ssh2_aesgcm_mac_clmul,
  10 #endif
  11 #if HAVE_NEON_PMULL
  12         &ssh2_aesgcm_mac_neon,
  13 #endif
  14         &ssh2_aesgcm_mac_sw,
  15         NULL,
  16     };
  17
  18     for (size_t i = 0; real_algs[i]; i++) {
  19         const ssh2_macalg *alg = real_algs[i];
  20         const struct aesgcm_extra *alg_extra =
  21             (const struct aesgcm_extra *)alg->extra;
  22         if (check_aesgcm_availability(alg_extra))
  23             return ssh2_mac_new(alg, cipher);
  24     }
  25
  26     /* We should never reach the NULL at the end of the list, because
  27      * the last non-NULL entry should be software-only GCM, which is
  28      * always available. */
  29     unreachable("aesgcm_select ran off the end of its list");
  30 }
  31
  32 const ssh2_macalg ssh2_aesgcm_mac = {
  33     .new = aesgcm_mac_selector_new,
  34     .name = "",
  35     .etm_name = "", /* Not selectable independently */
  36     .len = 16,
  37     .keylen = 0,
  38 };