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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 /security/keys/dh.c | |
| parent | 4340fa55298d17049e71c7a34e04647379c269f3 (diff) | |
| download | linux-4693fc734d675c5518ea9bd4c9623db45bc37402.tar.gz | |
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 'security/keys/dh.c')
| -rw-r--r-- | security/keys/dh.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/security/keys/dh.c b/security/keys/dh.c index 880505a4b9f1..531ed2ec132f 100644 --- a/security/keys/dh.c +++ b/security/keys/dh.c @@ -78,7 +78,8 @@ error: } long keyctl_dh_compute(struct keyctl_dh_params __user *params, - char __user *buffer, size_t buflen) + char __user *buffer, size_t buflen, + void __user *reserved) { long ret; MPI base, private, prime, result; @@ -97,6 +98,11 @@ long keyctl_dh_compute(struct keyctl_dh_params __user *params, goto out; } + if (reserved) { + ret = -EINVAL; + goto out; + } + keylen = mpi_from_key(pcopy.prime, buflen, &prime); if (keylen < 0 || !prime) { /* buflen == 0 may be used to query the required buffer size, |