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authorEric Biggers <ebiggers@google.com>2020-01-02 19:58:59 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2020-01-09 11:30:56 +0800
commitc282586fc341f9af741928f74a90163d26a1b347 (patch)
treef28e6ce244d20fc8d2386c6fa3cfd71094baeeff /crypto/chacha20poly1305.c
parentcrypto: ccm - use crypto_grab_ahash() and simplify error paths (diff)
downloadlinux-dev-c282586fc341f9af741928f74a90163d26a1b347.tar.xz
linux-dev-c282586fc341f9af741928f74a90163d26a1b347.zip
crypto: chacha20poly1305 - use crypto_grab_ahash() and simplify error paths
Make the rfc7539 and rfc7539esp templates use the new function crypto_grab_ahash() to initialize their ahash spawn. This is needed to make all spawns be initialized in a consistent way. Also simplify the error handling by taking advantage of crypto_drop_*() now accepting (as a no-op) spawns that haven't been initialized yet, and by taking advantage of crypto_grab_*() now handling ERR_PTR() names. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to '')
-rw-r--r--crypto/chacha20poly1305.c84
1 files changed, 27 insertions, 57 deletions
diff --git a/crypto/chacha20poly1305.c b/crypto/chacha20poly1305.c
index 09d5a34ab339..ccaea5cb66d1 100644
--- a/crypto/chacha20poly1305.c
+++ b/crypto/chacha20poly1305.c
@@ -16,8 +16,6 @@
#include <linux/kernel.h>
#include <linux/module.h>
-#include "internal.h"
-
struct chachapoly_instance_ctx {
struct crypto_skcipher_spawn chacha;
struct crypto_ahash_spawn poly;
@@ -560,11 +558,9 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
struct crypto_attr_type *algt;
u32 mask;
struct aead_instance *inst;
- struct skcipher_alg *chacha;
- struct crypto_alg *poly;
- struct hash_alg_common *poly_hash;
struct chachapoly_instance_ctx *ctx;
- const char *chacha_name, *poly_name;
+ struct skcipher_alg *chacha;
+ struct hash_alg_common *poly;
int err;
if (ivsize > CHACHAPOLY_IV_SIZE)
@@ -579,68 +575,51 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
mask = crypto_requires_sync(algt->type, algt->mask);
- chacha_name = crypto_attr_alg_name(tb[1]);
- if (IS_ERR(chacha_name))
- return PTR_ERR(chacha_name);
- poly_name = crypto_attr_alg_name(tb[2]);
- if (IS_ERR(poly_name))
- return PTR_ERR(poly_name);
-
- poly = crypto_find_alg(poly_name, &crypto_ahash_type,
- CRYPTO_ALG_TYPE_HASH,
- CRYPTO_ALG_TYPE_AHASH_MASK | mask);
- if (IS_ERR(poly))
- return PTR_ERR(poly);
- poly_hash = __crypto_hash_alg_common(poly);
-
- err = -EINVAL;
- if (poly_hash->digestsize != POLY1305_DIGEST_SIZE)
- goto out_put_poly;
-
- err = -ENOMEM;
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
if (!inst)
- goto out_put_poly;
-
+ return -ENOMEM;
ctx = aead_instance_ctx(inst);
ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize;
- err = crypto_init_ahash_spawn(&ctx->poly, poly_hash,
- aead_crypto_instance(inst));
- if (err)
- goto err_free_inst;
err = crypto_grab_skcipher(&ctx->chacha, aead_crypto_instance(inst),
- chacha_name, 0, mask);
+ crypto_attr_alg_name(tb[1]), 0, mask);
if (err)
- goto err_drop_poly;
-
+ goto err_free_inst;
chacha = crypto_spawn_skcipher_alg(&ctx->chacha);
+ err = crypto_grab_ahash(&ctx->poly, aead_crypto_instance(inst),
+ crypto_attr_alg_name(tb[2]), 0, mask);
+ if (err)
+ goto err_free_inst;
+ poly = crypto_spawn_ahash_alg(&ctx->poly);
+
err = -EINVAL;
+ if (poly->digestsize != POLY1305_DIGEST_SIZE)
+ goto err_free_inst;
/* Need 16-byte IV size, including Initial Block Counter value */
if (crypto_skcipher_alg_ivsize(chacha) != CHACHA_IV_SIZE)
- goto out_drop_chacha;
+ goto err_free_inst;
/* Not a stream cipher? */
if (chacha->base.cra_blocksize != 1)
- goto out_drop_chacha;
+ goto err_free_inst;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
"%s(%s,%s)", name, chacha->base.cra_name,
- poly->cra_name) >= CRYPTO_MAX_ALG_NAME)
- goto out_drop_chacha;
+ poly->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
+ goto err_free_inst;
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"%s(%s,%s)", name, chacha->base.cra_driver_name,
- poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
- goto out_drop_chacha;
+ poly->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
+ goto err_free_inst;
- inst->alg.base.cra_flags = (chacha->base.cra_flags | poly->cra_flags) &
- CRYPTO_ALG_ASYNC;
+ inst->alg.base.cra_flags = (chacha->base.cra_flags |
+ poly->base.cra_flags) & CRYPTO_ALG_ASYNC;
inst->alg.base.cra_priority = (chacha->base.cra_priority +
- poly->cra_priority) / 2;
+ poly->base.cra_priority) / 2;
inst->alg.base.cra_blocksize = 1;
inst->alg.base.cra_alignmask = chacha->base.cra_alignmask |
- poly->cra_alignmask;
+ poly->base.cra_alignmask;
inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) +
ctx->saltlen;
inst->alg.ivsize = ivsize;
@@ -656,20 +635,11 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
inst->free = chachapoly_free;
err = aead_register_instance(tmpl, inst);
- if (err)
- goto out_drop_chacha;
-
-out_put_poly:
- crypto_mod_put(poly);
- return err;
-
-out_drop_chacha:
- crypto_drop_skcipher(&ctx->chacha);
-err_drop_poly:
- crypto_drop_ahash(&ctx->poly);
+ if (err) {
err_free_inst:
- kfree(inst);
- goto out_put_poly;
+ chachapoly_free(inst);
+ }
+ return err;
}
static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb)