crypto: af_alg - User-space interface for Crypto API

This patch creates the backbone of the user-space interface for
the Crypto API, through a new socket family AF_ALG.

Each session corresponds to one or more connections obtained from
that socket.  The number depends on the number of inputs/outputs
of that particular type of operation.  For most types there will
be a s ingle connection/file descriptor that is used for both input
and output.  AEAD is one of the few that require two inputs.

Each algorithm type will provide its own implementation that plugs
into af_alg.  They're keyed using a string such as "skcipher" or
"hash".

IOW this patch only contains the boring bits that is required
to hold everything together.

Thakns to Miloslav Trmac for reviewing this and contributing
fixes and improvements.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Martin Willi <martin@strongswan.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index e4bac29a32e7..357e3caf4cbe 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -841,6 +841,9 @@ config CRYPTO_ANSI_CPRNG
           ANSI X9.31 A.2.4. Note that this option must be enabled if
           CRYPTO_FIPS is selected
 
+config CRYPTO_USER_API
+        tristate
+
 source "drivers/crypto/Kconfig"
 
 endif   # if CRYPTO