Increases binary size by about 4 kB (MIPS).
+config DROPBEAR_U2F
+ bool "U2F/FIDO support"
+ default y
+ help
+ This option itself doesn't enable any support for U2F/FIDO
+ but subordinate options do:
+
+ - DROPBEAR_ECDSA_SK - ecdsa-sk keys support
+ depends on DROPBEAR_ECC ("Elliptic curve cryptography (ECC)")
+ - DROPBEAR_ED25519_SK - ed25519-sk keys support
+ depends on DROPBEAR_ED25519 ("Ed25519 support")
+
+config DROPBEAR_ECDSA_SK
+ bool "ECDSA-SK support"
+ default y
+ depends on DROPBEAR_U2F && DROPBEAR_ECC
+ help
+ This enables the following public key algorithm:
+ sk-ecdsa-sha2-nistp256@openssh.com
+
+config DROPBEAR_ED25519_SK
+ bool "Ed25519-SK support"
+ default y
+ depends on DROPBEAR_U2F && DROPBEAR_ED25519
+ help
+ This enables the following public key algorithm:
+ sk-ssh-ed25519@openssh.com
+
config DROPBEAR_ZLIB
bool "Enable compression"
help
CONFIG_TARGET_INIT_PATH CONFIG_DROPBEAR_ECC CONFIG_DROPBEAR_ECC_FULL \
CONFIG_DROPBEAR_CURVE25519 CONFIG_DROPBEAR_ZLIB \
CONFIG_DROPBEAR_ED25519 CONFIG_DROPBEAR_CHACHA20POLY1305 \
+ CONFIG_DROPBEAR_U2F CONFIG_DROPBEAR_ECDSA_SK CONFIG_DROPBEAR_ED25519_SK \
CONFIG_DROPBEAR_UTMP CONFIG_DROPBEAR_PUTUTLINE \
CONFIG_DROPBEAR_DBCLIENT CONFIG_DROPBEAR_SCP CONFIG_DROPBEAR_ASKPASS \
CONFIG_DROPBEAR_DBCLIENT_AGENTFORWARD CONFIG_DROPBEAR_AGENTFORWARD \
DROPBEAR_CURVE25519,CONFIG_DROPBEAR_CURVE25519,1,0 \
DROPBEAR_CHACHA20POLY1305,CONFIG_DROPBEAR_CHACHA20POLY1305,1,0 \
DROPBEAR_ED25519,CONFIG_DROPBEAR_ED25519,1,0 \
- DROPBEAR_SK_ED25519,CONFIG_DROPBEAR_ED25519,1,0 \
DROPBEAR_ECDSA,CONFIG_DROPBEAR_ECC,1,0 \
- DROPBEAR_SK_ECDSA,CONFIG_DROPBEAR_ECC,1,0 \
DROPBEAR_ECDH,CONFIG_DROPBEAR_ECC,1,0 \
+ DROPBEAR_SK_KEYS,CONFIG_DROPBEAR_U2F,1,0 \
+ DROPBEAR_SK_ECDSA,CONFIG_DROPBEAR_ECDSA_SK,1,0 \
+ DROPBEAR_SK_ED25519,CONFIG_DROPBEAR_ED25519_SK,1,0 \
DROPBEAR_CLI_ASKPASS_HELPER,CONFIG_DROPBEAR_ASKPASS,1,0 \
DROPBEAR_CLI_AGENTFWD,CONFIG_DROPBEAR_DBCLIENT_AGENTFORWARD,1,0 \
DROPBEAR_SVR_AGENTFWD,CONFIG_DROPBEAR_AGENTFORWARD,1,0 \