Add helper function to determine if a given key-agreement protocol
primitive is supported.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
---
  crypto/kpp.c         | 6 ++++++
  include/crypto/kpp.h | 2 ++
  2 files changed, 8 insertions(+)

diff --git a/crypto/kpp.c b/crypto/kpp.c
index 313b2c699963..416e8a1a03ee 100644
--- a/crypto/kpp.c
+++ b/crypto/kpp.c

@@ -87,6 +87,12 @@ struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
  }
  EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
  
+int crypto_has_kpp(const char *alg_name, u32 type, u32 mask)
+{
+	return crypto_type_has_alg(alg_name, &crypto_kpp_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_has_kpp);
+
  static void kpp_prepare_alg(struct kpp_alg *alg)
  {
  	struct crypto_alg *base = &alg->base;

diff --git a/include/crypto/kpp.h b/include/crypto/kpp.h
index cccceadc164b..24d01e9877c1 100644
--- a/include/crypto/kpp.h
+++ b/include/crypto/kpp.h

@@ -104,6 +104,8 @@ struct kpp_alg {
   */
  struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask);
  
+int crypto_has_kpp(const char *alg_name, u32 type, u32 mask);
+
  static inline struct crypto_tfm *crypto_kpp_tfm(struct crypto_kpp *tfm)
  {
  	return &tfm->base;