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author | Herbert Xu <herbert@gondor.apana.org.au> | 2006-08-06 23:10:45 +1000 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2006-09-21 11:41:04 +1000 |
commit | 7fed0bf271b374be4c98a5880faed4b1128e78e9 (patch) | |
tree | 29a1244ed286c500bf64afcef0c571e771ed0cd5 /crypto/algapi.c | |
parent | df89820ebd5bbf4f3c6b5f8ee7d9e983107f6a91 (diff) | |
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[CRYPTO] api: Add common instance initialisation code
This patch adds the helpers crypto_get_attr_alg and crypto_alloc_instance
which can be used by simple one-argument templates like hmac to process
input parameters and allocate instances.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/algapi.c')
-rw-r--r-- | crypto/algapi.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c index 36c4f1bd..c915300 100644 --- a/crypto/algapi.c +++ b/crypto/algapi.c @@ -16,6 +16,7 @@ #include <linux/kernel.h> #include <linux/list.h> #include <linux/module.h> +#include <linux/rtnetlink.h> #include <linux/string.h> #include "internal.h" @@ -415,6 +416,58 @@ int crypto_unregister_notifier(struct notifier_block *nb) } EXPORT_SYMBOL_GPL(crypto_unregister_notifier); +struct crypto_alg *crypto_get_attr_alg(void *param, unsigned int len, + u32 type, u32 mask) +{ + struct rtattr *rta = param; + struct crypto_attr_alg *alga; + + if (!RTA_OK(rta, len)) + return ERR_PTR(-EBADR); + if (rta->rta_type != CRYPTOA_ALG || RTA_PAYLOAD(rta) < sizeof(*alga)) + return ERR_PTR(-EINVAL); + + alga = RTA_DATA(rta); + alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; + + return crypto_alg_mod_lookup(alga->name, type, mask); +} +EXPORT_SYMBOL_GPL(crypto_get_attr_alg); + +struct crypto_instance *crypto_alloc_instance(const char *name, + struct crypto_alg *alg) +{ + struct crypto_instance *inst; + struct crypto_spawn *spawn; + int err; + + inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); + if (!inst) + return ERR_PTR(-ENOMEM); + + err = -ENAMETOOLONG; + if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, + alg->cra_name) >= CRYPTO_MAX_ALG_NAME) + goto err_free_inst; + + if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", + name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) + goto err_free_inst; + + spawn = crypto_instance_ctx(inst); + err = crypto_init_spawn(spawn, alg, inst); + + if (err) + goto err_free_inst; + + return inst; + +err_free_inst: + kfree(inst); + return ERR_PTR(err); +} +EXPORT_SYMBOL_GPL(crypto_alloc_instance); + static int __init crypto_algapi_init(void) { crypto_init_proc(); |