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KEYS: add SP800-56A KDF support for DH

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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: Stephan Mueller <smueller@chronox.de>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Stephan Mueller
2016-08-19 20:39:09 +02:00
committed by David Howells
parent f0df90cd7c
commit f1c316a3ab
10 changed files with 315 additions and 26 deletions
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7
include/uapi/linux/keyctl.h
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@@ -69,4 +69,11 @@ struct keyctl_dh_params {
__s32 base;
};
struct keyctl_kdf_params {
char *hashname;
char *otherinfo;
__u32 otherinfolen;
__u32 __spare[8];
};
#endif /* _LINUX_KEYCTL_H */