Re: [PATCH/proposal] dm-crypt: add digest-based iv generation mode

[James Morris]

On Tue, 24 Feb 2004, Matt Mackall wrote:

> Something like:
> 
>  /* calculate the size of a tfm so that users can manage their own
>  copies */
> 
>  int crypto_alg_size(const char *name);
> 
>  /* copy a TFM to a user-managed buffer, possibly on stack, with proper
>  internal reference counting and any other necessary magic, size checks
>  against boneheaded buffer sizing */
> 
>  crypto_copy_tfm(char *dst, const struct crypto_tfm *src, int size);

Does it need to be copied from an existing tfm?  I think it would be 
cleaner to provide just a way to initialize a tfm.

>  /* do all the necessary bookkeeping to release a user-managed TFM, use
>  char pointer to avoid alloc/free mismatch */
> 
>  crypto_copy_cleanup_tfm(char *usertfm);
> 

This is doable.


- James
-- 
James Morris
<jmorris@xxxxxxxxxx>


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