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crypto: ofb - add output feedback mode

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Add a generic version of output feedback mode. We already have support of
several hardware based transformations of this mode and the needed test
vectors but we somehow missed adding a generic software one. Fix this now.

Signed-off-by: Gilad Ben-Yossef <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Gilad Ben-Yossef 2018-09-20 14:18:39 +01:00 • committed by Herbert Xu
commit e497c51896
3 changed files with 238 additions and 0 deletions
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12
crypto/Kconfig
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@ -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