doc: fitImage: example of a signature node

Describe that a signature node can be added to a binary device tree using
the mkimage tool.

Provide an example device tree node.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/doc/uImage.FIT/signature.txt b/doc/uImage.FIT/signature.txt
index eee06517fa5ecbaa584abd440e6dd9212001ff3a..3591225a6edd87ea60b9424b130fcf11a1a903d6 100644 (file)
--- a/doc/uImage.FIT/signature.txt
+++ b/doc/uImage.FIT/signature.txt
@@ -167,6 +167,68 @@ 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
 
+These parameters can be added to a binary device tree using parameter -K of the
+mkimage command::
+
+    tools/mkimage -f fit.its -K control.dtb -k keys -r image.fit
+
+Here is an example of a generated device tree node::
+
+       signature {
+               key-dev {
+                       required = "conf";
+                       algo = "sha256,rsa2048";
+                       rsa,r-squared = <0xb76d1acf 0xa1763ca5 0xeb2f126
+                                       0x742edc80 0xd3f42177 0x9741d9d9
+                                       0x35bb476e 0xff41c718 0xd3801430
+                                       0xf22537cb 0xa7e79960 0xae32a043
+                                       0x7da1427a 0x341d6492 0x3c2762f5
+                                       0xaac04726 0x5b262d96 0xf984e86d
+                                       0xb99443c7 0x17080c33 0x940f6892
+                                       0xd57a95d1 0x6ea7b691 0xc5038fa8
+                                       0x6bb48a6e 0x73f1b1ea 0x37160841
+                                       0xe05715ce 0xa7c45bbd 0x690d82d5
+                                       0x99c2454c 0x6ff117b3 0xd830683b
+                                       0x3f81c9cf 0x1ca38a91 0x0c3392e4
+                                       0xd817c625 0x7b8e9a24 0x175b89ea
+                                       0xad79f3dc 0x4d50d7b4 0x9d4e90f8
+                                       0xad9e2939 0xc165d6a4 0x0ada7e1b
+                                       0xfb1bf495 0xfc3131c2 0xb8c6e604
+                                       0xc2761124 0xf63de4a6 0x0e9565f9
+                                       0xc8e53761 0x7e7a37a5 0xe99dcdae
+                                       0x9aff7e1e 0xbd44b13d 0x6b0e6aa4
+                                       0x038907e4 0x8e0d6850 0xef51bc20
+                                       0xf73c94af 0x88bea7b1 0xcbbb1b30
+                                       0xd024b7f3>;
+                       rsa,modulus = <0xc0711d6cb 0x9e86db7f 0x45986dbe
+                                      0x023f1e8c9 0xe1a4c4d0 0x8a0dfdc9
+                                      0x023ba0c48 0x06815f6a 0x5caa0654
+                                      0x07078c4b7 0x3d154853 0x40729023
+                                      0x0b007c8fe 0x5a3647e5 0x23b41e20
+                                      0x024720591 0x66915305 0x0e0b29b0
+                                      0x0de2ad30d 0x8589430f 0xb1590325
+                                      0x0fb9f5d5e 0x9eba752a 0xd88e6de9
+                                      0x056b3dcc6 0x9a6b8e61 0x6784f61f
+                                      0x000f39c21 0x5eec6b33 0xd78e4f78
+                                      0x0921a305f 0xaa2cc27e 0x1ca917af
+                                      0x06e1134f4 0xd48cac77 0x4e914d07
+                                      0x0f707aa5a 0x0d141f41 0x84677f1d
+                                      0x0ad47a049 0x028aedb6 0xd5536fcf
+                                      0x03fef1e4f 0x133a03d2 0xfd7a750a
+                                      0x0f9159732 0xd207812e 0x6a807375
+                                      0x06434230d 0xc8e22dad 0x9f29b3d6
+                                      0x07c44ac2b 0xfa2aad88 0xe2429504
+                                      0x041febd41 0x85d0d142 0x7b194d65
+                                      0x06e5d55ea 0x41116961 0xf3181dde
+                                      0x068bf5fbc 0x3dd82047 0x00ee647e
+                                      0x0d7a44ab3>;
+                       rsa,exponent = <0x00 0x10001>;
+                       rsa,n0-inverse = <0xb3928b85>;
+                       rsa,num-bits = <0x800>;
+                       key-name-hint = "dev";
+               };
+       };
+
 
 Signed Configurations
 ---------------------