Hi,

I am trying to write a hmac(sha1) algorithm and I have a few questions. I have a HW crypto accelerator that does the actual crypto work. I have already successfully implemented sha1 by creating a CRYPTO_ALG_TYPE_DIGEST algorithm.

1) Can I implement hmac(sha1) as a CRYPTO_ALG_TYPE_DIGEST algorithm (i.e. use very similar code to sha1)?

2) Do I need to create a CRYPTO_ALG_TYPE_HASH algorithm?

3) Is it possible to implement hmac(sha1) as both CRYPTO_ALG_TYPE_DIGEST and CRYPTO_ALG_TYPE_HASH?

4) If I use a CRYPTO_ALG_TYPE_HASH, I need to understand the scatterwalk api, is there any help on the subject?

Regards,
Dimitris

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