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crypto: cfb - add support for Cipher FeedBack mode

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TPM security routines require encryption and decryption with AES in
CFB mode, so add it to the Linux Crypto schemes.  CFB is basically a
one time pad where the pad is generated initially from the encrypted
IV and then subsequently from the encrypted previous block of
ciphertext.  The pad is XOR'd into the plain text to get the final
ciphertext.

https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#CFB

Signed-off-by: James Bottomley <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
James Bottomley 2018-03-01 14:36:17 -08:00 • committed by Herbert Xu
commit a7d85e06ed
3 changed files with 362 additions and 0 deletions
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8
crypto/Kconfig
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@ -320,6 +320,14 @@ config CRYPTO_CBC
CBC: Cipher Block Chaining mode
This block cipher algorithm is required for IPSec.
config CRYPTO_CFB
tristate "CFB support"
select CRYPTO_BLKCIPHER
select CRYPTO_MANAGER
help
CFB: Cipher FeedBack mode
This block cipher algorithm is required for TPM2 Cryptography.
config CRYPTO_CTR
tristate "CTR support"
select CRYPTO_BLKCIPHER