#include <linux/hardirq.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/scatterlist.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
crt->setkey = async_setkey;
crt->encrypt = async_encrypt;
crt->decrypt = async_decrypt;
- if (!alg->ivsize) {
- crt->givencrypt = skcipher_null_givencrypt;
- crt->givdecrypt = skcipher_null_givdecrypt;
- }
crt->base = __crypto_ablkcipher_cast(tfm);
crt->ivsize = alg->ivsize;
};
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);
- if (IS_ERR(algt))
- return ERR_CAST(algt);
-
- if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) &
- algt->mask)
- return ERR_PTR(-EINVAL);
-
- name = crypto_attr_alg_name(tb[1]);
- if (IS_ERR(name))
- return ERR_CAST(name);
-
- 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");
projects / karo-tx-linux.git / blobdiff