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crypto: x86/aes-xts - simplify loop in xts_crypt_slowpath()

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Since the total length processed by the loop in xts_crypt_slowpath() is
a multiple of AES_BLOCK_SIZE, just round the length down to
AES_BLOCK_SIZE even on the last step.  This doesn't change behavior, as
the last step will process a multiple of AES_BLOCK_SIZE regardless.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2024-04-19 22:54:55 -07:00 committed by Herbert Xu
parent c819d7b836
commit 6a80586474
1 changed files with 5 additions and 8 deletions
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13
arch/x86/crypto/aesni-intel_glue.c
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@ -935,16 +935,13 @@ xts_crypt_slowpath(struct skcipher_request *req, xts_crypt_func crypt_func)
err = skcipher_walk_virt(&walk, req, false);
while (walk.nbytes) {
unsigned int nbytes = walk.nbytes;
if (nbytes < walk.total)
nbytes = round_down(nbytes, AES_BLOCK_SIZE);
kernel_fpu_begin();
(*crypt_func)(&ctx->crypt_ctx, walk.src.virt.addr,
walk.dst.virt.addr, nbytes, req->iv);
(*crypt_func)(&ctx->crypt_ctx,
walk.src.virt.addr, walk.dst.virt.addr,
walk.nbytes & ~(AES_BLOCK_SIZE - 1), req->iv);
kernel_fpu_end();
err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
err = skcipher_walk_done(&walk,
walk.nbytes & (AES_BLOCK_SIZE - 1));
}
if (err || !tail)