crypto: aead - Add crypto_has_aead

Add the helper crypto_has_aead.  This is meant to replace the
existing use of crypto_has_alg to locate AEAD algorithms.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 18 insertions, 0 deletions

diff --git a/crypto/aead.c b/crypto/aead.c
index d5ba204ebdbf..54906633566a 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -269,6 +269,12 @@ struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
 }
 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
 
+int crypto_has_aead(const char *alg_name, u32 type, u32 mask)
+{
+	return crypto_type_has_alg(alg_name, &crypto_aead_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_has_aead);
+
 static int aead_prepare_alg(struct aead_alg *alg)
 {
 	struct crypto_istat_aead *istat = aead_get_stat(alg);
diff --git a/include/crypto/aead.h b/include/crypto/aead.h
index 35e45b854a6f..51382befbe37 100644
--- a/include/crypto/aead.h
+++ b/include/crypto/aead.h
@@ -217,6 +217,18 @@ static inline void crypto_free_aead(struct crypto_aead *tfm)
 	crypto_destroy_tfm(tfm, crypto_aead_tfm(tfm));
 }
 
+/**
+ * crypto_has_aead() - Search for the availability of an aead.
+ * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
+ *	      aead
+ * @type: specifies the type of the aead
+ * @mask: specifies the mask for the aead
+ *
+ * Return: true when the aead is known to the kernel crypto API; false
+ *	   otherwise
+ */
+int crypto_has_aead(const char *alg_name, u32 type, u32 mask);
+
 static inline const char *crypto_aead_driver_name(struct crypto_aead *tfm)
 {
 	return crypto_tfm_alg_driver_name(crypto_aead_tfm(tfm));