Implement server-side support for sk-ecdsa U2F-backed keys (#142) * Implement server-side support for sk-ecdsa U2F-backed keys * Fix out-of-bounds read on normal ecdsa-sha2-[identifier] keys * Fix one more potential out-of-bounds read * Check if nistp256 curve is used in sk-ecdsa-sha2- key It's the only allowed curve per PROTOCOL.u2f specification * Implement server-side support for sk-ed25519 FIDO2-backed keys * Keys with type sk-* make no sense as host keys, so they should be disabled * fix typo * Make sk-ecdsa call buf_ecdsa_verify This reduces code duplication, the SK code just handles the different message format. * Reduce sk specific code The application id can be stored in signkey, then we don't need to call sk-specific functions from svr-authpubkey * Remove debugging output, which causes compilation errors with DEBUG_TRACE disabled * Proper cleanup of sk_app Co-authored-by: Matt Johnston <[email protected]>

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sk-ecdsa.h	Sat Jan 22 16:53:04 2022 +0300
@@ -0,0 +1,15 @@
+#ifndef DROPBEAR_SK_ECDSA_H_
+#define DROPBEAR_SK_ECDSA_H_
+
+#include "includes.h"
+
+#if DROPBEAR_SK_ECDSA
+
+#include "buffer.h"
+#include "signkey.h"
+
+int buf_sk_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf, const char* app, unsigned int applen);
+
+#endif
+
+#endif /* DROPBEAR_SK_ECDSA_H_ */