[CRYPTO] aead: Add authenc

This patch adds the authenc algorithm which constructs an AEAD algorithm
from an asynchronous block cipher and a hash.  The construction is done
by concatenating the encrypted result from the cipher with the output
from the hash, as is used by the IPsec ESP protocol.

The authenc algorithm exists as a template with four parameters:

	authenc(auth, authsize, enc, enckeylen).

The authentication algorithm, the authentication size (i.e., truncating
the output of the authentication algorithm), the encryption algorithm,
and the encryption key length.  Both the size field and the key length
field are in bytes.  For example, AES-128 with SHA1-HMAC would be
represented by

	authenc(hmac(sha1), 12, cbc(aes), 16)

The key for the authenc algorithm is the concatenation of the keys for
the authentication algorithm with the encryption algorithm.  For the
above example, if a key of length 36 bytes is given, then hmac(sha1)
would receive the first 20 bytes while the last 16 would be given to
cbc(aes).

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 8 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index f42bc7715f48..05f46dfdf185 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -483,6 +483,14 @@ config CRYPTO_TEST
         help
           Quick & dirty crypto test module.
 
+config CRYPTO_AUTHENC
+        tristate "Authenc support"
+        select CRYPTO_AEAD
+        select CRYPTO_MANAGER
+        help
+          Authenc: Combined mode wrapper for IPsec.
+          This is required for IPSec.
+
 source "drivers/crypto/Kconfig"
 
 endif   # if CRYPTO