--- a/signkey.h	Mon May 25 20:55:13 2020 +0500
+++ b/signkey.h	Tue May 26 00:24:02 2020 +0800
@@ -26,10 +26,13 @@
 #define DROPBEAR_SIGNKEY_H_
 
 #include "buffer.h"
-#include "dss.h"
-#include "rsa.h"
-#include "ed25519.h"
 
+/* Forward declarations */
+struct dropbear_DSS_Key;
+struct dropbear_RSA_Key;
+struct dropbear_ED25519_Key;
+
+/* Must match with signature_type below */
 enum signkey_type {
 #if DROPBEAR_RSA
 	DROPBEAR_SIGNKEY_RSA,
@@ -51,6 +54,28 @@
 	DROPBEAR_SIGNKEY_NONE = 90,
 };
 
+/* Must match with signkey_type above, apart from rsa */
+enum signature_type {
+#if DROPBEAR_DSS
+	DROPBEAR_SIGNATURE_DSS = DROPBEAR_SIGNKEY_DSS,
+#endif
+#if DROPBEAR_ECDSA
+	DROPBEAR_SIGNATURE_ECDSA_NISTP256 = DROPBEAR_SIGNKEY_ECDSA_NISTP256,
+	DROPBEAR_SIGNATURE_ECDSA_NISTP384 = DROPBEAR_SIGNKEY_ECDSA_NISTP384,
+	DROPBEAR_SIGNATURE_ECDSA_NISTP521 = DROPBEAR_SIGNKEY_ECDSA_NISTP521,
+#endif /* DROPBEAR_ECDSA */
+#if DROPBEAR_ED25519
+	DROPBEAR_SIGNATURE_ED25519 = DROPBEAR_SIGNKEY_ED25519,
+#endif
+#if DROPBEAR_RSA_SHA1
+	DROPBEAR_SIGNATURE_RSA_SHA1 = 100, /* ssh-rsa signature (sha1) */
+#endif
+#if DROPBEAR_RSA_SHA256
+	DROPBEAR_SIGNATURE_RSA_SHA256 = 101, /* rsa-sha2-256 signature. has a ssh-rsa key */
+#endif
+	DROPBEAR_SIGNATURE_NONE = DROPBEAR_SIGNKEY_NONE,
+};
+
 
 /* Sources for signing keys */
 typedef enum {
@@ -66,10 +91,10 @@
 	char *filename;
 
 #if DROPBEAR_DSS
-	dropbear_dss_key * dsskey;
+	struct dropbear_DSS_Key * dsskey;
 #endif
 #if DROPBEAR_RSA
-	dropbear_rsa_key * rsakey;
+	struct dropbear_RSA_Key * rsakey;
 #endif
 #if DROPBEAR_ECDSA
 #if DROPBEAR_ECC_256
@@ -83,7 +108,7 @@
 #endif
 #endif
 #if DROPBEAR_ED25519
-	dropbear_ed25519_key * ed25519key;
+	struct dropbear_ED25519_Key * ed25519key;
 #endif
 };
 
@@ -92,14 +117,19 @@
 sign_key * new_sign_key(void);
 const char* signkey_name_from_type(enum signkey_type type, unsigned int *namelen);
 enum signkey_type signkey_type_from_name(const char* name, unsigned int namelen);
+const char* signature_name_from_type(enum signature_type type, unsigned int *namelen);
+enum signature_type signature_type_from_name(const char* name, unsigned int namelen);
+enum signkey_type signkey_type_from_signature(enum signature_type sigtype);
+enum signature_type signature_type_from_signkey(enum signkey_type keytype);
+
 int buf_get_pub_key(buffer *buf, sign_key *key, enum signkey_type *type);
 int buf_get_priv_key(buffer* buf, sign_key *key, enum signkey_type *type);
 void buf_put_pub_key(buffer* buf, sign_key *key, enum signkey_type type);
 void buf_put_priv_key(buffer* buf, sign_key *key, enum signkey_type type);
 void sign_key_free(sign_key *key);
-void buf_put_sign(buffer* buf, sign_key *key, enum signkey_type type, const buffer *data_buf);
+void buf_put_sign(buffer* buf, sign_key *key, enum signature_type sigtype, const buffer *data_buf);
 #if DROPBEAR_SIGNKEY_VERIFY
-int buf_verify(buffer * buf, sign_key *key, const buffer *data_buf);
+int buf_verify(buffer * buf, sign_key *key, enum signature_type expect_sigtype, const buffer *data_buf);
 char * sign_key_fingerprint(const unsigned char* keyblob, unsigned int keybloblen);
 #endif
 int cmp_base64_key(const unsigned char* keyblob, unsigned int keybloblen,