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-rw-r--r--crypto/Kconfig12
1 files changed, 12 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 4ef95b0b25a3..63ef279322d2 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -456,6 +456,18 @@ config CRYPTO_LRW
The first 128, 192 or 256 bits in the key are used for AES and the
rest is used to tie each cipher block to its logical position.
+config CRYPTO_OFB
+ tristate "OFB support"
+ select CRYPTO_BLKCIPHER
+ select CRYPTO_MANAGER
+ help
+ OFB: the Output Feedback mode makes a block cipher into a synchronous
+ stream cipher. It generates keystream blocks, which are then XORed
+ with the plaintext blocks to get the ciphertext. Flipping a bit in the
+ ciphertext produces a flipped bit in the plaintext at the same
+ location. This property allows many error correcting codes to function
+ normally even when applied before encryption.
+
config CRYPTO_PCBC
tristate "PCBC support"
select CRYPTO_BLKCIPHER