package/libs/wolfssl/patches/200-ecc-rng.patch

   1 Since commit 6467de5a8840 ("Randomize z ordinates in scalar
   2 mult when timing resistant") wolfssl requires a RNG for an EC
   3 key when the hardened built option is selected.
   4
   5 wc_ecc_set_rng is only available when built hardened, so there
   6 is no safe way to install the RNG to the key regardless whether
   7 or not wolfssl is compiled hardened.
   8
   9 Always export wc_ecc_set_rng so tools such as hostapd can install
  10 RNG regardless of the built settings for wolfssl.
  11
  12 --- a/wolfcrypt/src/ecc.c
  13 +++ b/wolfcrypt/src/ecc.c
  14 @@ -11655,21 +11655,21 @@ void wc_ecc_fp_free(void)
  15
  16  #endif /* FP_ECC */
  17
  18 -#ifdef ECC_TIMING_RESISTANT
  19  int wc_ecc_set_rng(ecc_key* key, WC_RNG* rng)
  20  {
  21      int err = 0;
  22
  23 +#ifdef ECC_TIMING_RESISTANT
  24      if (key == NULL) {
  25          err = BAD_FUNC_ARG;
  26      }
  27      else {
  28          key->rng = rng;
  29      }
  30 +#endif
  31
  32      return err;
  33  }
  34 -#endif
  35
  36  #ifdef HAVE_ECC_ENCRYPT
  37
  38 --- a/wolfssl/wolfcrypt/ecc.h
  39 +++ b/wolfssl/wolfcrypt/ecc.h
  40 @@ -650,10 +650,8 @@ WOLFSSL_API
  41  void wc_ecc_fp_free(void);
  42  WOLFSSL_LOCAL
  43  void wc_ecc_fp_init(void);
  44 -#ifdef ECC_TIMING_RESISTANT
  45  WOLFSSL_API
  46  int wc_ecc_set_rng(ecc_key* key, WC_RNG* rng);
  47 -#endif
  48
  49  WOLFSSL_API
  50  int wc_ecc_set_curve(ecc_key* key, int keysize, int curve_id);