diff options
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/aead.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/crypto/aead.c b/crypto/aead.c index 9f7aca891926..f5b1add31976 100644 --- a/crypto/aead.c +++ b/crypto/aead.c @@ -17,6 +17,7 @@ #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/rtnetlink.h> #include <linux/slab.h> #include <linux/seq_file.h> @@ -328,5 +329,157 @@ void aead_geniv_exit(struct crypto_tfm *tfm) } EXPORT_SYMBOL_GPL(aead_geniv_exit); +static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask) +{ + struct rtattr *tb[3]; + struct { + struct rtattr attr; + struct crypto_attr_type data; + } ptype; + struct { + struct rtattr attr; + struct crypto_attr_alg data; + } palg; + struct crypto_template *tmpl; + struct crypto_instance *inst; + struct crypto_alg *larval; + const char *geniv; + int err; + + larval = crypto_larval_lookup(alg->cra_driver_name, + CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV, + CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); + err = PTR_ERR(larval); + if (IS_ERR(larval)) + goto out; + + err = -EAGAIN; + if (!crypto_is_larval(larval)) + goto drop_larval; + + ptype.attr.rta_len = sizeof(ptype); + ptype.attr.rta_type = CRYPTOA_TYPE; + ptype.data.type = type | CRYPTO_ALG_GENIV; + /* GENIV tells the template that we're making a default geniv. */ + ptype.data.mask = mask | CRYPTO_ALG_GENIV; + tb[0] = &ptype.attr; + + palg.attr.rta_len = sizeof(palg); + palg.attr.rta_type = CRYPTOA_ALG; + /* Must use the exact name to locate ourselves. */ + memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); + tb[1] = &palg.attr; + + tb[2] = NULL; + + geniv = alg->cra_aead.geniv; + + tmpl = crypto_lookup_template(geniv); + err = -ENOENT; + if (!tmpl) + goto kill_larval; + + inst = tmpl->alloc(tb); + err = PTR_ERR(inst); + if (IS_ERR(inst)) + goto put_tmpl; + + if ((err = crypto_register_instance(tmpl, inst))) { + tmpl->free(inst); + goto put_tmpl; + } + + /* Redo the lookup to use the instance we just registered. */ + err = -EAGAIN; + +put_tmpl: + crypto_tmpl_put(tmpl); +kill_larval: + crypto_larval_kill(larval); +drop_larval: + crypto_mod_put(larval); +out: + crypto_mod_put(alg); + return err; +} + +static struct crypto_alg *crypto_lookup_aead(const char *name, u32 type, + u32 mask) +{ + struct crypto_alg *alg; + + alg = crypto_alg_mod_lookup(name, type, mask); + if (IS_ERR(alg)) + return alg; + + if (alg->cra_type == &crypto_aead_type) + return alg; + + if (!alg->cra_aead.ivsize) + return alg; + + return ERR_PTR(crypto_nivaead_default(alg, type, mask)); +} + +int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name, + u32 type, u32 mask) +{ + struct crypto_alg *alg; + int err; + + type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); + type |= CRYPTO_ALG_TYPE_AEAD; + mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); + mask |= CRYPTO_ALG_TYPE_MASK; + + alg = crypto_lookup_aead(name, type, mask); + if (IS_ERR(alg)) + return PTR_ERR(alg); + + err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); + crypto_mod_put(alg); + return err; +} +EXPORT_SYMBOL_GPL(crypto_grab_aead); + +struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask) +{ + struct crypto_tfm *tfm; + int err; + + type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); + type |= CRYPTO_ALG_TYPE_AEAD; + mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); + mask |= CRYPTO_ALG_TYPE_MASK; + + for (;;) { + struct crypto_alg *alg; + + alg = crypto_lookup_aead(alg_name, type, mask); + if (IS_ERR(alg)) { + err = PTR_ERR(alg); + goto err; + } + + tfm = __crypto_alloc_tfm(alg, type, mask); + if (!IS_ERR(tfm)) + return __crypto_aead_cast(tfm); + + crypto_mod_put(alg); + err = PTR_ERR(tfm); + +err: + if (err != -EAGAIN) + break; + if (signal_pending(current)) { + err = -EINTR; + break; + } + } + + return ERR_PTR(err); +} +EXPORT_SYMBOL_GPL(crypto_alloc_aead); + MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)"); |