ABLKCIPHER

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Hi,

I am trying to write an ABLKCIPHER algorithm for my hardware crypto engine and I have a few questions:

1) In struct ablkcipher_alg, what do these fields do? I see some implementations use them and some not. Do I need to implement them?
   int (*givencrypt)(struct skcipher_givcrypt_request *req);
   int (*givdecrypt)(struct skcipher_givcrypt_request *req);
   const char *geniv;

2) What is a CRYPTO_ALG_TYPE_GIVCIPHER? What does it do and how does it interface to other algorithms?

In case, it is important; we are using linux-2.6.28 but we will soon move to linux-2.6.31. The ultimate goal is to accelerate authenc(cbc(aes),hmac(sha1)) and I am currently implementing the simpler algorithms as a learning exercise.

Regards,
Dimitris
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