This series creates an ESSIV template that produces a skcipher or AEAD transform based on a tuple of the form '<skcipher>,<cipher>,<shash>' (or '<aead>,<cipher>,<shash>' for the AEAD case). It exposes the encapsulated sync or async skcipher/aead by passing through all operations, while using the cipher/shash pair to transform the input IV into an ESSIV output IV. This matches what both users of ESSIV in the kernel do, and so it is proposed as a replacement for those, in patches #2 and #4. This code has been tested using the fscrypt test suggested by Eric (generic/549), as well as the mode-test script suggested by Milan for the dm-crypt case. I also tested the aead case in a virtual machine, but it definitely needs some wider testing from the dm-crypt experts. Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Cc: Eric Biggers <ebiggers@xxxxxxxxxx> Cc: dm-devel@xxxxxxxxxx Cc: linux-fscrypt@xxxxxxxxxxxxxxx Cc: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> Cc: Milan Broz <gmazyland@xxxxxxxxx> Ard Biesheuvel (4): crypto: essiv - create wrapper template for ESSIV generation fs: crypto: invoke crypto API for ESSIV handling md: dm-crypt: infer ESSIV block cipher from cipher string directly md: dm-crypt: switch to ESSIV crypto API template crypto/Kconfig | 4 + crypto/Makefile | 1 + crypto/essiv.c | 624 ++++++++++++++++++++ drivers/md/Kconfig | 1 + drivers/md/dm-crypt.c | 237 ++------ fs/crypto/Kconfig | 1 + fs/crypto/crypto.c | 5 - fs/crypto/fscrypt_private.h | 9 - fs/crypto/keyinfo.c | 88 +-- 9 files changed, 675 insertions(+), 295 deletions(-) create mode 100644 crypto/essiv.c -- 2.17.1
