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| author | Stephan Mueller <smueller@chronox.de> | 2016-05-26 23:38:12 +0200 |
|---|---|---|
| committer | James Morris <james.l.morris@oracle.com> | 2016-06-03 16:14:34 +1000 |
| commit | 4693fc734d675c5518ea9bd4c9623db45bc37402 (patch) | |
| tree | 54dcf2388f5868c5d5a8ab4faf3b64a8e2fa4f79 /Documentation | |
| parent | 4340fa55298d17049e71c7a34e04647379c269f3 (diff) | |
| download | linux-4693fc734d675c5518ea9bd4c9623db45bc37402.tar.bz2 | |
KEYS: Add placeholder for KDF usage with DH
The values computed during Diffie-Hellman key exchange are often used
in combination with key derivation functions to create cryptographic
keys. Add a placeholder for a later implementation to configure a
key derivation function that will transform the Diffie-Hellman
result returned by the KEYCTL_DH_COMPUTE command.
[This patch was stripped down from a patch produced by Mat Martineau that
had a bug in the compat code - so for the moment Stephan's patch simply
requires that the placeholder argument must be NULL]
Original-signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/security/keys.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/security/keys.txt b/Documentation/security/keys.txt index 20d05719bceb..3849814bfe6d 100644 --- a/Documentation/security/keys.txt +++ b/Documentation/security/keys.txt @@ -826,7 +826,8 @@ The keyctl syscall functions are: (*) Compute a Diffie-Hellman shared secret or public key long keyctl(KEYCTL_DH_COMPUTE, struct keyctl_dh_params *params, - char *buffer, size_t buflen); + char *buffer, size_t buflen, + void *reserved); The params struct contains serial numbers for three keys: @@ -843,6 +844,8 @@ The keyctl syscall functions are: public key. If the base is the remote public key, the result is the shared secret. + The reserved argument must be set to NULL. + The buffer length must be at least the length of the prime, or zero. If the buffer length is nonzero, the length of the result is |