crypto: atmel-aes - properly set IV after {en,de}crypt

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Certain cipher modes like CTS expect the IV (req->info) of
ablkcipher_request (or equivalently req->iv of skcipher_request) to
contain the last ciphertext block when the {en,de}crypt operation is done.

Fix this issue for the Atmel AES hardware engine. The tcrypt test
case for cts(cbc(aes)) is now correctly passed.

In the case of in-place decryption, copy the ciphertext in an
intermediate buffer before decryption.

Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Romain Izard 2017-10-31 16:25:23 +01:00 • committed by Herbert Xu

parent 142a27f0a7

commit 91308019ec

1 changed files with 37 additions and 3 deletions

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drivers/crypto/atmel-aes.c

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