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crypto: skcipher - pass instance to crypto_grab_skcipher()

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Initializing a crypto_skcipher_spawn currently requires:

1. Set spawn->base.inst to point to the instance.
2. Call crypto_grab_skcipher().

But there's no reason for these steps to be separate, and in fact this
unneeded complication has caused at least one bug, the one fixed by
commit 6db4341017 ("crypto: adiantum - initialize crypto_spawn::inst")

So just make crypto_grab_skcipher() take the instance as an argument.

To keep the function calls from getting too unwieldy due to this extra
argument, also introduce a 'mask' variable into the affected places
which weren't already using one.

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 2020-01-02 19:58:45 -08:00 • committed by Herbert Xu
parent 77f7e94d72
commit b9f76dddb1
14 changed files with 68 additions and 71 deletions
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11
crypto/adiantum.c
View file

@ -493,6 +493,7 @@ static bool adiantum_supported_algorithms(struct skcipher_alg *streamcipher_alg,
static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct crypto_attr_type *algt;
u32 mask;
const char *streamcipher_name;
const char *blockcipher_name;
const char *nhpoly1305_name;
@ -511,6 +512,8 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
streamcipher_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(streamcipher_name))
return PTR_ERR(streamcipher_name);
@ -531,11 +534,9 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
ictx = skcipher_instance_ctx(inst);
/* Stream cipher, e.g. "xchacha12" */
crypto_set_skcipher_spawn(&ictx->streamcipher_spawn,
skcipher_crypto_instance(inst));
err = crypto_grab_skcipher(&ictx->streamcipher_spawn, streamcipher_name,
0, crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(&ictx->streamcipher_spawn,
skcipher_crypto_instance(inst),
streamcipher_name, 0, mask);
if (err)
goto out_free_inst;
streamcipher_alg = crypto_spawn_skcipher_alg(&ictx->streamcipher_spawn);