I looked at recent GCM code and noticed this:
/* FIXME: Should use const for the cipher context. Then needs const for
nettle_crypt_func, which also rules out using that abstraction for
arcfour. */
void
gcm_set_key(struct gcm_key *key,
void *cipher, nettle_crypt_func *f);
However GCM (like CCM) is only specified for block ciphers, and further,
only for 128-bit block ciphers. Thus I wonder if avoiding use of const
just to let the abstraction support a stream cipher is wise?
/Simon
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