Eric Biggers e8cfed5e4e
crypto: cipher - remove crt_u.cipher (struct cipher_tfm) ...
Of the three fields in crt_u.cipher (struct cipher_tfm), ->cit_setkey()
is pointless because it always points to setkey() in crypto/cipher.c.
->cit_decrypt_one() and ->cit_encrypt_one() are slightly less pointless,
since if the algorithm doesn't have an alignmask, they are set directly
to ->cia_encrypt() and ->cia_decrypt(). However, this "optimization"
isn't worthwhile because:
- The "cipher" algorithm type is the only algorithm still using crt_u,
so it's bloating every struct crypto_tfm for every algorithm type.
- If the algorithm has an alignmask, this "optimization" actually makes
things slower, as it causes 2 indirect calls per block rather than 1.
- It adds extra code complexity.
- Some templates already call ->cia_encrypt()/->cia_decrypt() directly
instead of going through ->cit_encrypt_one()/->cit_decrypt_one().
- The "cipher" algorithm type never gives optimal performance anyway.
For that, a higher-level type such as skcipher needs to be used.
Therefore, just remove the extra indirection, and make
crypto_cipher_setkey(), crypto_cipher_encrypt_one(), and
crypto_cipher_decrypt_one() be direct calls into crypto/cipher.c.
Also remove the unused function crypto_cipher_cast().
Signed-off-by: Eric Biggers <ebiggers@google.com >
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au >
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