From: Alexandru Gagniuc Date: Fri, 19 Feb 2021 18:45:13 +0000 (-0600) Subject: doc: signature.txt: Document devicetree format for ECDSA keys X-Git-Tag: v2021.10~224^2~22 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9eef0fe7e5b47b5bc2dde19d67fcde6ee91662c8;p=platform%2Fkernel%2Fu-boot.git doc: signature.txt: Document devicetree format for ECDSA keys Signed-off-by: Alexandru Gagniuc Reviewed-by: Simon Glass --- diff --git a/doc/uImage.FIT/signature.txt b/doc/uImage.FIT/signature.txt index a345588..0139295 100644 --- a/doc/uImage.FIT/signature.txt +++ b/doc/uImage.FIT/signature.txt @@ -142,7 +142,7 @@ public key in U-Boot's control FDT (using CONFIG_OF_CONTROL). Public keys should be stored as sub-nodes in a /signature node. Required properties are: -- algo: Algorithm name (e.g. "sha1,rsa2048") +- algo: Algorithm name (e.g. "sha1,rsa2048" or "sha256,ecdsa256") Optional properties are: @@ -167,6 +167,11 @@ For RSA the following are mandatory: - rsa,r-squared: (2^num-bits)^2 as a big-endian multi-word integer - rsa,n0-inverse: -1 / modulus[0] mod 2^32 +For ECDSA the following are mandatory: +- ecdsa,curve: Name of ECDSA curve (e.g. "prime256v1") +- ecdsa,x-point: Public key X coordinate as a big-endian multi-word integer +- ecdsa,y-point: Public key Y coordinate as a big-endian multi-word integer + These parameters can be added to a binary device tree using parameter -K of the mkimage command::