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]>

--- a/sysoptions.h	Sat Jan 22 12:46:08 2022 +0800
+++ b/sysoptions.h	Sat Jan 22 16:53:04 2022 +0300
@@ -95,6 +95,7 @@
 #define DROPBEAR_MAX_PASSWORD_LEN 100
 
 #define SHA1_HASH_SIZE 20
+#define SHA256_HASH_SIZE 32
 #define MD5_HASH_SIZE 16
 #define MAX_HASH_SIZE 64 /* sha512 */