[CRYPTO] cipher: Added block ciphers for CBC/ECB

This patch adds two block cipher algorithms, CBC and ECB.  These
are implemented as templates on top of existing single-block cipher
algorithms.  They invoke the single-block cipher through the new
encrypt_one/decrypt_one interface.

This also optimises the in-place encryption and decryption to remove
the cost of an IV copy each round.

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

1 files changed, 17 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 68790ad7308d..90d467c99c2c 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -123,6 +123,23 @@ config CRYPTO_TGR192
           See also:
           <http://www.cs.technion.ac.il/~biham/Reports/Tiger/>.
 
+config CRYPTO_ECB
+        tristate "ECB support"
+        select CRYPTO_BLKCIPHER
+        default m
+        help
+          ECB: Electronic CodeBook mode
+          This is the simplest block cipher algorithm.  It simply encrypts
+          the input block by block.
+
+config CRYPTO_CBC
+        tristate "CBC support"
+        select CRYPTO_BLKCIPHER
+        default m
+        help
+          CBC: Cipher Block Chaining mode
+          This block cipher algorithm is required for IPSec.
+
 config CRYPTO_DES
         tristate "DES and Triple DES EDE cipher algorithms"
         select CRYPTO_ALGAPI