diff options
| -rw-r--r-- | crypto/gcm.c | 113 |
1 files changed, 89 insertions, 24 deletions
diff --git a/crypto/gcm.c b/crypto/gcm.c index f6bee6f209a6..e87e5de8e7b3 100644 --- a/crypto/gcm.c +++ b/crypto/gcm.c @@ -413,30 +413,23 @@ static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm) crypto_free_ablkcipher(ctx->ctr); } -static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb) +static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb, + const char *full_name, + const char *ctr_name) { + struct crypto_attr_type *algt; struct crypto_instance *inst; struct crypto_alg *ctr; - struct crypto_alg *cipher; struct gcm_instance_ctx *ctx; int err; - char ctr_name[CRYPTO_MAX_ALG_NAME]; - err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD); - if (err) + algt = crypto_get_attr_type(tb); + err = PTR_ERR(algt); + if (IS_ERR(algt)) return ERR_PTR(err); - cipher = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER, - CRYPTO_ALG_TYPE_MASK); - - inst = ERR_PTR(PTR_ERR(cipher)); - if (IS_ERR(cipher)) - return inst; - - inst = ERR_PTR(ENAMETOOLONG); - if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", - cipher->cra_name) >= CRYPTO_MAX_ALG_NAME) - return inst; + if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) + return ERR_PTR(-EINVAL); ctr = crypto_alg_mod_lookup(ctr_name, CRYPTO_ALG_TYPE_BLKCIPHER, CRYPTO_ALG_TYPE_MASK); @@ -444,7 +437,14 @@ static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb) if (IS_ERR(ctr)) return ERR_PTR(PTR_ERR(ctr)); - if (cipher->cra_blocksize != 16) + /* We only support 16-byte blocks. */ + if ((ctr->cra_type == &crypto_blkcipher_type ? + ctr->cra_blkcipher.ivsize : ctr->cra_ablkcipher.ivsize) != 16) + goto out_put_ctr; + + /* Not a stream cipher? */ + err = -EINVAL; + if (ctr->cra_blocksize != 1) goto out_put_ctr; inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); @@ -453,21 +453,21 @@ static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb) goto out_put_ctr; err = -ENAMETOOLONG; - if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, - "gcm(%s)", cipher->cra_name) >= CRYPTO_MAX_ALG_NAME || - snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, - "gcm(%s)", cipher->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) + if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, + "gcm_base(%s)", ctr->cra_driver_name) >= + CRYPTO_MAX_ALG_NAME) goto err_free_inst; - ctx = crypto_instance_ctx(inst); err = crypto_init_spawn(&ctx->ctr, ctr, inst, CRYPTO_ALG_TYPE_MASK); if (err) goto err_free_inst; + memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME); + inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC; inst->alg.cra_priority = ctr->cra_priority; - inst->alg.cra_blocksize = 16; + inst->alg.cra_blocksize = 1; inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1); inst->alg.cra_type = &crypto_aead_type; inst->alg.cra_aead.ivsize = 16; @@ -489,6 +489,29 @@ out_put_ctr: goto out; } +static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb) +{ + int err; + const char *cipher_name; + char ctr_name[CRYPTO_MAX_ALG_NAME]; + char full_name[CRYPTO_MAX_ALG_NAME]; + + cipher_name = crypto_attr_alg_name(tb[1]); + err = PTR_ERR(cipher_name); + if (IS_ERR(cipher_name)) + return ERR_PTR(err); + + if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= + CRYPTO_MAX_ALG_NAME) + return ERR_PTR(-ENAMETOOLONG); + + if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >= + CRYPTO_MAX_ALG_NAME) + return ERR_PTR(-ENAMETOOLONG); + + return crypto_gcm_alloc_common(tb, full_name, ctr_name); +} + static void crypto_gcm_free(struct crypto_instance *inst) { struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst); @@ -504,14 +527,55 @@ static struct crypto_template crypto_gcm_tmpl = { .module = THIS_MODULE, }; +static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb) +{ + int err; + const char *ctr_name; + char full_name[CRYPTO_MAX_ALG_NAME]; + + ctr_name = crypto_attr_alg_name(tb[1]); + err = PTR_ERR(ctr_name); + if (IS_ERR(ctr_name)) + return ERR_PTR(err); + + if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s)", + ctr_name) >= CRYPTO_MAX_ALG_NAME) + return ERR_PTR(-ENAMETOOLONG); + + return crypto_gcm_alloc_common(tb, full_name, ctr_name); +} + +static struct crypto_template crypto_gcm_base_tmpl = { + .name = "gcm_base", + .alloc = crypto_gcm_base_alloc, + .free = crypto_gcm_free, + .module = THIS_MODULE, +}; + static int __init crypto_gcm_module_init(void) { - return crypto_register_template(&crypto_gcm_tmpl); + int err; + + err = crypto_register_template(&crypto_gcm_base_tmpl); + if (err) + goto out; + + err = crypto_register_template(&crypto_gcm_tmpl); + if (err) + goto out_undo_base; + +out: + return err; + +out_undo_base: + crypto_unregister_template(&crypto_gcm_base_tmpl); + goto out; } static void __exit crypto_gcm_module_exit(void) { crypto_unregister_template(&crypto_gcm_tmpl); + crypto_unregister_template(&crypto_gcm_base_tmpl); } module_init(crypto_gcm_module_init); @@ -520,3 +584,4 @@ module_exit(crypto_gcm_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Galois/Counter Mode"); MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); +MODULE_ALIAS("gcm_base"); |