[RFC] consider keysize in algorithm selection

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Hello Herbert,

this is my first attempt. 
patch 1 - the main patch (touching core api)
patch 2 - fixing remaining crypto infrastructure
patch 3 - fixing some users

Almost all users are easy to fix. The wlan stack allocates the cipher at
one time and sets the key at another time. So I don't know the requested
keysize at allocation time.
In the fixup, crypto_authenc_alloc() got a little ugly. The keysize is
only consider for the blkcipher but the hash might also be limited. Tell
me what you thing about this one. Maybe something like cbc(aes|192) is a
better solution.

Sebastian
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