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    • Matt Caswell's avatar
      Ensure we test all parameters for BN_FLG_CONSTTIME · 86ccadf5
      Matt Caswell authored
      
      
      RSA_setup_blinding() calls BN_BLINDING_create_param() which later calls
      BN_mod_exp() as follows:
      
      BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx)
      
      ret->mod will have BN_FLG_CONSTTIME set, but ret->e does not. In
      BN_mod_exp() we only test the third param for the existence of this flag.
      We should test all the inputs.
      
      Thanks to Samuel Weiser (samuel.weiser@iaik.tugraz.at) for reporting this
      issue.
      
      This typically only happens once at key load, so this is unlikely to be
      exploitable in any real scenario.
      
      Reviewed-by: default avatarRich Salz <rsalz@openssl.org>
      (Merged from https://github.com/openssl/openssl/pull/4477)
      
      (cherry picked from commit e913d11f)
      86ccadf5
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