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[v4,4/6] doc: signature.txt: Document devicetree format for ECDSA keys

Message ID 20210108191737.615022-5-mr.nuke.me@gmail.com
State Changes Requested
Delegated to: Tom Rini
Headers show
Series Add support for ECDSA image signing (with test) | expand

Commit Message

Alexandru Gagniuc Jan. 8, 2021, 7:17 p.m. UTC
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
---
 doc/uImage.FIT/signature.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
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Patch

diff --git a/doc/uImage.FIT/signature.txt b/doc/uImage.FIT/signature.txt
index a3455889ed..0139295d33 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::