[gnutls-devel] GnuTLS | xts: check key block according to FIPS-140-2 IG A.9 (!1233)

[Development of GNU's TLS library]

Dmitry Baryshkov commented on a discussion on lib/nettle/cipher.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/1233#note_323441975

>  		     length, dst, src);
>  }
>  
> +static void
> +_xts_aes128_set_encrypt_key(struct xts_aes128_key *xts_key,
> +			    const uint8_t *key)
> +{
> +	if (safe_memcmp(key, key + AES128_KEY_SIZE, AES128_KEY_SIZE) == 0)
> +		_gnutls_switch_lib_state(LIB_STATE_ERROR);
> +	else
> +		xts_aes128_set_encrypt_key(xts_key, key);

Moreover in non-FIPS case if I understand correctly, this will result in GnuTLS silently ignoring key changes.

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