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doc: signature.txt: Document the keydir and keyfile arguments

After lots of debating, this documents how we'd like mkimage to treat
'keydir' and 'keyfile' arguments. The rest is in the docs.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Alexandru Gagniuc 3 years ago
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      doc/uImage.FIT/signature.txt

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doc/uImage.FIT/signature.txt

@@ -472,6 +472,19 @@ Test Verified Boot Run: signed config with bad hash: OK
 Test passed
 
 
+Software signing: keydir vs keyfile
+-----------------------------------
+
+In the simplest case, signing is done by giving mkimage the 'keyfile'. This is
+the path to a file containing the signing key.
+
+The alternative is to pass the 'keydir' argument. In this case the filename of
+the key is derived from the 'keydir' and the "key-name-hint" property in the
+FIT. In this case the "key-name-hint" property is mandatory, and the key must
+exist in "<keydir>/<key-name-hint>.<ext>" Here the extension "ext" is
+specific to the signing algorithm.
+
+
 Hardware Signing with PKCS#11 or with HSM
 -----------------------------------------