diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h
index fc097326..0d164c6 100644
--- a/include/crypto/public_key.h
+++ b/include/crypto/public_key.h
@@ -98,4 +98,8 @@
 extern int verify_signature(const struct key *key,
 			    const struct public_key_signature *sig);
 
+extern struct key *x509_request_asymmetric_key(struct key *keyring,
+					       const char *issuer,
+					       const char *key_id);
+
 #endif /* _LINUX_PUBLIC_KEY_H */