Re: [ptxdist] [PATCH v2] dropbear: Added Elliptic Curve Cryptography options.

[Michael Olbrich <m.olbrich@pengutronix.de>]

On Mon, Jun 16, 2014 at 02:02:41PM +0200, Bruno Thomsen wrote:
> Support for ecdsa, ecdh and curve25519-donna options.
> 
> Signed-off-by: Bruno Thomsen <bth@kamstrup.dk>
> ---
> v1..v2:
> Removed redundant default n from Kconfig file.

Thanks, applied.

Michael

> 
> 
>  rules/dropbear.in   |   26 ++++++++++++++++++++++++--
>  rules/dropbear.make |   24 ++++++++++++++++++++++++
>  2 files changed, 48 insertions(+), 2 deletions(-)
> 
> diff --git a/rules/dropbear.in b/rules/dropbear.in
> index 21301ba..fe2ada3 100644
> --- a/rules/dropbear.in
> +++ b/rules/dropbear.in
> @@ -235,7 +235,6 @@ config DROPBEAR_SHA1_96
>  config DROPBEAR_SHA256
>  	bool
>  	prompt "sha256"
> -	default n
>  	help
>  	  SHA-2 is a set of cryptographic hash functions (SHA-224, SHA-256,
>  	  SHA-384, SHA-512) designed by the National Security Agency (NSA)
> @@ -248,7 +247,6 @@ config DROPBEAR_SHA256
>  config DROPBEAR_SHA512
>  	bool
>  	prompt "sha512"
> -	default n
>  	help
>  	  SHA-2 is a set of cryptographic hash functions (SHA-224, SHA-256,
>  	  SHA-384, SHA-512) designed by the National Security Agency (NSA)
> @@ -288,6 +286,30 @@ config DROPBEAR_DSS
>  	  key size). In contrast, RSA signature length is a function
>  	  of the key length employed.
>  
> +config DROPBEAR_ECDSA
> +	bool
> +	prompt "ecdsa"
> +	help
> +	  ECDSA stands for Elliptic Curve Digital Signature Algorithm.
> +	  ECDSA is significantly faster than RSA or DSS.
> +
> +config DROPBEAR_ECDH
> +	bool
> +	prompt "ecdh"
> +	help
> +	  ECDH stands for Elliptic Curve Diffie-Hellman.
> +
> +config DROPBEAR_CURVE25519
> +	bool
> +	depends on DROPBEAR_ECDSA || DROPBEAR_ECDH
> +	prompt "curve25519-donna"
> +	help
> +	  Enable curve25519-donna for key exchange.
> +	  This is another elliptic curve method with good security properties.
> +	  This algorithm does not rely on NIST-based curves
> +	  and gives us more security confidence against a possible
> +	  backdoor in nistp-256 curve.
> +
>  comment "Authentication types, at least one required --- RFC Draft requires pubkey auth"
>  
>  config DROPBEAR_PASSWD
> diff --git a/rules/dropbear.make b/rules/dropbear.make
> index 5ab6fd3..5cbd4aa 100644
> --- a/rules/dropbear.make
> +++ b/rules/dropbear.make
> @@ -222,6 +222,30 @@ else
>  	@$(call disable_c, $(DROPBEAR_DIR)/options.h,DROPBEAR_DSS)
>  endif
>  
> +ifdef PTXCONF_DROPBEAR_ECDSA
> +	@echo "ptxdist: enabling ecdsa"
> +	@$(call enable_c, $(DROPBEAR_DIR)/options.h,DROPBEAR_ECDSA)
> +else
> +	@echo "ptxdist: disabling ecdsa"
> +	@$(call disable_c, $(DROPBEAR_DIR)/options.h,DROPBEAR_ECDSA)
> +endif
> +
> +ifdef PTXCONF_DROPBEAR_ECDH
> +	@echo "ptxdist: enabling ecdh"
> +	@$(call enable_c, $(DROPBEAR_DIR)/options.h,DROPBEAR_ECDH)
> +else
> +	@echo "ptxdist: disabling ecdh"
> +	@$(call disable_c, $(DROPBEAR_DIR)/options.h,DROPBEAR_ECDH)
> +endif
> +
> +ifdef PTXCONF_DROPBEAR_CURVE25519
> +	@echo "ptxdist: enabling curve25519"
> +	@$(call enable_c, $(DROPBEAR_DIR)/options.h,DROPBEAR_CURVE25519)
> +else
> +	@echo "ptxdist: disabling curve25519"
> +	@$(call disable_c, $(DROPBEAR_DIR)/options.h,DROPBEAR_CURVE25519)
> +endif
> +
>  ifdef PTXCONF_DROPBEAR_PASSWD
>  	@echo "ptxdist: enabling passwd"
>  	@$(call enable_c, $(DROPBEAR_DIR)/options.h,ENABLE_SVR_PASSWORD_AUTH)
> -- 
> 1.7.9.5
> 
> 
> -- 
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> ptxdist@pengutronix.de
> 

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