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authorNicolai Stange <nstange@suse.de>2022-02-21 13:10:47 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2022-03-03 10:47:49 +1200
commit1038fd78a1b8269b642ce09600242682186a78e2 (patch)
tree1371505ab64dfa56ebae8f0f111527865da387ef /crypto
parent4058cf08945c18a6de193f4118fd05d83d3d4285 (diff)
crypto: kpp - provide support for KPP template instances
The upcoming support for the RFC 7919 ffdhe group parameters will be made available in the form of templates like "ffdhe2048(dh)", "ffdhe3072(dh)" and so on. Template instantiations thereof would wrap the inner "dh" kpp_alg and also provide kpp_alg services to the outside again. Furthermore, it might be perhaps be desirable to provide KDF templates in the future, which would similarly wrap an inner kpp_alg and present themselves to the outside as another kpp_alg, transforming the shared secret on its way out. Introduce the bits needed for supporting KPP template instances. Everything related to inner kpp_alg spawns potentially being held by such template instances will be deferred to a subsequent patch in order to facilitate review. Define struct struct kpp_instance in close analogy to the already existing skcipher_instance, shash_instance and alike, but wrapping a struct kpp_alg. Implement the new kpp_register_instance() template instance registration primitive. Provide some helper functions for - going back and forth between a generic struct crypto_instance and the new struct kpp_instance, - obtaining the instantiating kpp_instance from a crypto_kpp transform and - for accessing a given kpp_instance's implementation specific context data. Annotate everything with proper kernel-doc comments, even though include/crypto/internal/kpp.h is not considered for the generated docs. Signed-off-by: Nicolai Stange <nstange@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/kpp.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/crypto/kpp.c b/crypto/kpp.c
index 313b2c699963..458195495a1d 100644
--- a/crypto/kpp.c
+++ b/crypto/kpp.c
@@ -68,9 +68,17 @@ static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
return 0;
}
+static void crypto_kpp_free_instance(struct crypto_instance *inst)
+{
+ struct kpp_instance *kpp = kpp_instance(inst);
+
+ kpp->free(kpp);
+}
+
static const struct crypto_type crypto_kpp_type = {
.extsize = crypto_alg_extsize,
.init_tfm = crypto_kpp_init_tfm,
+ .free = crypto_kpp_free_instance,
#ifdef CONFIG_PROC_FS
.show = crypto_kpp_show,
#endif
@@ -111,5 +119,17 @@ void crypto_unregister_kpp(struct kpp_alg *alg)
}
EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
+int kpp_register_instance(struct crypto_template *tmpl,
+ struct kpp_instance *inst)
+{
+ if (WARN_ON(!inst->free))
+ return -EINVAL;
+
+ kpp_prepare_alg(&inst->alg);
+
+ return crypto_register_instance(tmpl, kpp_crypto_instance(inst));
+}
+EXPORT_SYMBOL_GPL(kpp_register_instance);
+
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Key-agreement Protocol Primitives");