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crypto: vmx/xts - use fallback for ciphertext stealing

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For correctness and compliance with the XTS-AES specification, we are
adding support for ciphertext stealing to XTS implementations, even
though no use cases are known that will be enabled by this.

Since the Power8 implementation already has a fallback skcipher standby
for other purposes, let's use it for this purpose as well. If ciphertext
stealing use cases ever become a bottleneck, we can always revisit this.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2019-08-16 17:06:24 +03:00 committed by Herbert Xu
parent ce68acbcb6
commit 2396684193
1 changed files with 1 additions and 1 deletions
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drivers/crypto/vmx/aes_xts.c
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@ -84,7 +84,7 @@ static int p8_aes_xts_crypt(struct skcipher_request *req, int enc)
u8 tweak[AES_BLOCK_SIZE];
int ret;
if (!crypto_simd_usable()) {
if (!crypto_simd_usable() || (req->cryptlen % XTS_BLOCK_SIZE) != 0) {
struct skcipher_request *subreq = skcipher_request_ctx(req);
*subreq = *req;