#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/kernel.h>
-#include <linux/rtnetlink.h>
-#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/cryptouser.h>
return alg->cra_ctxsize;
}
-int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
-{
- return crypto_ablkcipher_encrypt(&req->creq);
-}
-
-int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
-{
- return crypto_ablkcipher_decrypt(&req->creq);
-}
-
static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
u32 mask)
{
crt->setkey = setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->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_ablkcipher_type);
-static int no_givdecrypt(struct skcipher_givcrypt_request *req)
-{
- return -ENOSYS;
-}
-
static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
u32 mask)
{
alg->setkey : setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
- crt->givencrypt = alg->givencrypt ?: no_givdecrypt;
- crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
crt->base = __crypto_ablkcipher_cast(tfm);
crt->ivsize = alg->ivsize;
.report = crypto_givcipher_report,
};
EXPORT_SYMBOL_GPL(crypto_givcipher_type);
-
-const char *crypto_default_geniv(const struct crypto_alg *alg)
-{
- if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
- CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
- alg->cra_ablkcipher.ivsize) !=
- alg->cra_blocksize)
- return "chainiv";
-
- return "eseqiv";
-}
-
-static int crypto_givcipher_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,
- (type & ~CRYPTO_ALG_TYPE_MASK) |
- CRYPTO_ALG_TYPE_GIVCIPHER,
- mask | CRYPTO_ALG_TYPE_MASK);
- 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;
-
- if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
- CRYPTO_ALG_TYPE_BLKCIPHER)
- geniv = alg->cra_blkcipher.geniv;
- else
- geniv = alg->cra_ablkcipher.geniv;
-
- if (!geniv)
- geniv = crypto_default_geniv(alg);
-
- tmpl = crypto_lookup_template(geniv);
- err = -ENOENT;
- if (!tmpl)
- goto kill_larval;
-
- if (tmpl->create) {
- err = tmpl->create(tmpl, tb);
- if (err)
- goto put_tmpl;
- goto ok;
- }
-
- inst = tmpl->alloc(tb);
- err = PTR_ERR(inst);
- if (IS_ERR(inst))
- goto put_tmpl;
-
- err = crypto_register_instance(tmpl, inst);
- if (err) {
- tmpl->free(inst);
- goto put_tmpl;
- }
-
-ok:
- /* 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;
-}
-
-struct crypto_alg *crypto_lookup_skcipher(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_flags & CRYPTO_ALG_TYPE_MASK) ==
- CRYPTO_ALG_TYPE_GIVCIPHER)
- return alg;
-
- if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
- CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
- alg->cra_ablkcipher.ivsize))
- return alg;
-
- crypto_mod_put(alg);
- alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
- mask & ~CRYPTO_ALG_TESTED);
- if (IS_ERR(alg))
- return alg;
-
- if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
- CRYPTO_ALG_TYPE_GIVCIPHER) {
- if (~alg->cra_flags & (type ^ ~mask) & CRYPTO_ALG_TESTED) {
- crypto_mod_put(alg);
- alg = ERR_PTR(-ENOENT);
- }
- return alg;
- }
-
- BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
- CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
- alg->cra_ablkcipher.ivsize));
-
- return ERR_PTR(crypto_givcipher_default(alg, type, mask));
-}
-EXPORT_SYMBOL_GPL(crypto_lookup_skcipher);
-
-int crypto_grab_skcipher(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);
-
- alg = crypto_lookup_skcipher(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_skcipher);
-
-struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
- u32 type, u32 mask)
-{
- struct crypto_tfm *tfm;
- int err;
-
- type = crypto_skcipher_type(type);
- mask = crypto_skcipher_mask(mask);
-
- for (;;) {
- struct crypto_alg *alg;
-
- alg = crypto_lookup_skcipher(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_ablkcipher_cast(tfm);
-
- crypto_mod_put(alg);
- err = PTR_ERR(tfm);
-
-err:
- if (err != -EAGAIN)
- break;
- if (fatal_signal_pending(current)) {
- err = -EINTR;
- break;
- }
- }
-
- return ERR_PTR(err);
-}
-EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
projects / cascardo / linux.git / blobdiff