KEYS: Add a key type op to permit the key description to be vetted
Add a key type operation to permit the key type to vet the description of a new key that key_alloc() is about to allocate. The operation may reject the description if it wishes with an error of its choosing. If it does this, the key will not be allocated. Signed-off-by: NDavid Howells <dhowells@redhat.com> Reviewed-by: NMimi Zohar <zohar@us.ibm.com> Signed-off-by: NJames Morris <jmorris@namei.org>
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