diff options
Diffstat (limited to 'crypto/blkcipher.c')
| -rw-r--r-- | crypto/blkcipher.c | 185 |
1 files changed, 184 insertions, 1 deletions
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c index 7a3e1a308074..ca6ef065cded 100644 --- a/crypto/blkcipher.c +++ b/crypto/blkcipher.c @@ -14,8 +14,8 @@ * */ +#include <crypto/internal/skcipher.h> #include <crypto/scatterwalk.h> -#include <linux/crypto.h> #include <linux/errno.h> #include <linux/hardirq.h> #include <linux/kernel.h> @@ -450,6 +450,7 @@ static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm) crt->setkey = async_setkey; crt->encrypt = async_encrypt; crt->decrypt = async_decrypt; + crt->base = __crypto_ablkcipher_cast(tfm); crt->ivsize = alg->ivsize; return 0; @@ -509,5 +510,187 @@ const struct crypto_type crypto_blkcipher_type = { }; EXPORT_SYMBOL_GPL(crypto_blkcipher_type); +static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn, + const char *name, u32 type, u32 mask) +{ + struct crypto_alg *alg; + int err; + + type = crypto_skcipher_type(type); + mask = crypto_skcipher_mask(mask) | CRYPTO_ALG_GENIV; + + alg = crypto_alg_mod_lookup(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; +} + +struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl, + struct rtattr **tb, u32 type, + u32 mask) +{ + struct { + int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key, + unsigned int keylen); + int (*encrypt)(struct ablkcipher_request *req); + int (*decrypt)(struct ablkcipher_request *req); + + unsigned int min_keysize; + unsigned int max_keysize; + unsigned int ivsize; + + const char *geniv; + } balg; + const char *name; + struct crypto_skcipher_spawn *spawn; + struct crypto_attr_type *algt; + struct crypto_instance *inst; + struct crypto_alg *alg; + int err; + + algt = crypto_get_attr_type(tb); + err = PTR_ERR(algt); + if (IS_ERR(algt)) + return ERR_PTR(err); + + if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) & + algt->mask) + return ERR_PTR(-EINVAL); + + name = crypto_attr_alg_name(tb[1]); + err = PTR_ERR(name); + if (IS_ERR(name)) + return ERR_PTR(err); + + inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); + if (!inst) + return ERR_PTR(-ENOMEM); + + spawn = crypto_instance_ctx(inst); + + /* Ignore async algorithms if necessary. */ + mask |= crypto_requires_sync(algt->type, algt->mask); + + crypto_set_skcipher_spawn(spawn, inst); + err = crypto_grab_nivcipher(spawn, name, type, mask); + if (err) + goto err_free_inst; + + alg = crypto_skcipher_spawn_alg(spawn); + + if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == + CRYPTO_ALG_TYPE_BLKCIPHER) { + balg.ivsize = alg->cra_blkcipher.ivsize; + balg.min_keysize = alg->cra_blkcipher.min_keysize; + balg.max_keysize = alg->cra_blkcipher.max_keysize; + + balg.setkey = async_setkey; + balg.encrypt = async_encrypt; + balg.decrypt = async_decrypt; + + balg.geniv = alg->cra_blkcipher.geniv; + } else { + balg.ivsize = alg->cra_ablkcipher.ivsize; + balg.min_keysize = alg->cra_ablkcipher.min_keysize; + balg.max_keysize = alg->cra_ablkcipher.max_keysize; + + balg.setkey = alg->cra_ablkcipher.setkey; + balg.encrypt = alg->cra_ablkcipher.encrypt; + balg.decrypt = alg->cra_ablkcipher.decrypt; + + balg.geniv = alg->cra_ablkcipher.geniv; + } + + err = -EINVAL; + if (!balg.ivsize) + goto err_drop_alg; + + /* + * This is only true if we're constructing an algorithm with its + * default IV generator. For the default generator we elide the + * template name and double-check the IV generator. + */ + if (algt->mask & CRYPTO_ALG_GENIV) { + if (!balg.geniv) + balg.geniv = crypto_default_geniv(alg); + err = -EAGAIN; + if (strcmp(tmpl->name, balg.geniv)) + goto err_drop_alg; + + memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); + memcpy(inst->alg.cra_driver_name, alg->cra_driver_name, + CRYPTO_MAX_ALG_NAME); + } else { + err = -ENAMETOOLONG; + if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, + "%s(%s)", tmpl->name, alg->cra_name) >= + CRYPTO_MAX_ALG_NAME) + goto err_drop_alg; + if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, + "%s(%s)", tmpl->name, alg->cra_driver_name) >= + CRYPTO_MAX_ALG_NAME) + goto err_drop_alg; + } + + inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV; + inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; + inst->alg.cra_priority = alg->cra_priority; + inst->alg.cra_blocksize = alg->cra_blocksize; + inst->alg.cra_alignmask = alg->cra_alignmask; + inst->alg.cra_type = &crypto_givcipher_type; + + inst->alg.cra_ablkcipher.ivsize = balg.ivsize; + inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize; + inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize; + inst->alg.cra_ablkcipher.geniv = balg.geniv; + + inst->alg.cra_ablkcipher.setkey = balg.setkey; + inst->alg.cra_ablkcipher.encrypt = balg.encrypt; + inst->alg.cra_ablkcipher.decrypt = balg.decrypt; + +out: + return inst; + +err_drop_alg: + crypto_drop_skcipher(spawn); +err_free_inst: + kfree(inst); + inst = ERR_PTR(err); + goto out; +} +EXPORT_SYMBOL_GPL(skcipher_geniv_alloc); + +void skcipher_geniv_free(struct crypto_instance *inst) +{ + crypto_drop_skcipher(crypto_instance_ctx(inst)); + kfree(inst); +} +EXPORT_SYMBOL_GPL(skcipher_geniv_free); + +int skcipher_geniv_init(struct crypto_tfm *tfm) +{ + struct crypto_instance *inst = (void *)tfm->__crt_alg; + struct crypto_ablkcipher *cipher; + + cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst)); + if (IS_ERR(cipher)) + return PTR_ERR(cipher); + + tfm->crt_ablkcipher.base = cipher; + tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher); + + return 0; +} +EXPORT_SYMBOL_GPL(skcipher_geniv_init); + +void skcipher_geniv_exit(struct crypto_tfm *tfm) +{ + crypto_free_ablkcipher(tfm->crt_ablkcipher.base); +} +EXPORT_SYMBOL_GPL(skcipher_geniv_exit); + MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Generic block chaining cipher type"); |