| Message ID | 20240420055455.25179-1-ebiggers@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | crypto: x86/aes-xts - simplify loop in xts_crypt_slowpath() | expand |
Eric Biggers <ebiggers@kernel.org> wrote: > From: Eric Biggers <ebiggers@google.com> > > 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> > --- > arch/x86/crypto/aesni-intel_glue.c | 13 +++++-------- > 1 file changed, 5 insertions(+), 8 deletions(-) Patch applied. Thanks.
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c index 110b3282a1f2..02a4c0c276df 100644 --- a/arch/x86/crypto/aesni-intel_glue.c +++ b/arch/x86/crypto/aesni-intel_glue.c @@ -933,20 +933,17 @@ 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) return err;