Implement server-side support for sk-ecdsa U2F-backed keys (#142) * Implement server-side support for sk-ecdsa U2F-backed keys * Fix out-of-bounds read on normal ecdsa-sha2-[identifier] keys * Fix one more potential out-of-bounds read * Check if nistp256 curve is used in sk-ecdsa-sha2- key It's the only allowed curve per PROTOCOL.u2f specification * Implement server-side support for sk-ed25519 FIDO2-backed keys * Keys with type sk-* make no sense as host keys, so they should be disabled * fix typo * Make sk-ecdsa call buf_ecdsa_verify This reduces code duplication, the SK code just handles the different message format. * Reduce sk specific code The application id can be stored in signkey, then we don't need to call sk-specific functions from svr-authpubkey * Remove debugging output, which causes compilation errors with DEBUG_TRACE disabled * Proper cleanup of sk_app Co-authored-by: Matt Johnston <[email protected]>

/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */
#include "tomcrypt.h"

/**
  @file crypt_find_hash_oid.c
  Find a hash, Tom St Denis
*/

int find_hash_oid(const unsigned long *ID, unsigned long IDlen)
{
   int x;
   LTC_ARGCHK(ID != NULL);
   LTC_MUTEX_LOCK(&ltc_hash_mutex);
   for (x = 0; x < TAB_SIZE; x++) {
       if (hash_descriptor[x].name != NULL && hash_descriptor[x].OIDlen == IDlen && !XMEMCMP(hash_descriptor[x].OID, ID, sizeof(unsigned long) * IDlen)) {
          LTC_MUTEX_UNLOCK(&ltc_hash_mutex);
          return x;
       }
   }
   LTC_MUTEX_UNLOCK(&ltc_hash_mutex);
   return -1;
}

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