• Stephan Mueller's avatar
    KEYS: add SP800-56A KDF support for DH · f1c316a3
    Stephan Mueller authored
    SP800-56A defines the use of DH with key derivation function based on a
    counter. The input to the KDF is defined as (DH shared secret || other
    information). The value for the "other information" is to be provided by
    the caller.
    
    The KDF is implemented using the hash support from the kernel crypto API.
    The implementation uses the symmetric hash support as the input to the
    hash operation is usually very small. The caller is allowed to specify
    the hash name that he wants to use to derive the key material allowing
    the use of all supported hashes provided with the kernel crypto API.
    
    As the KDF implements the proper truncation of the DH shared secret to
    the requested size, this patch fills the caller buffer up to its size.
    
    The patch is tested with a new test added to the keyutils user space
    code which uses a CAVS test vector testing the compliance with
    SP800-56A.
    Signed-off-by: default avatarStephan Mueller <smueller@chronox.de>
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    f1c316a3
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