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mx8m: csf.sh: use vars for keys to avoid file edits when signing

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The csf_spl.txt and csf_fit.txt templates contain file paths which must
be edited for the location of your NXP CST generated key files.

Streamline the process of signing an image by assigning unique var names
to these which can be expended from env variables in the csf.sh script.

The following vars are used:
 SRK_TABLE - full path to SRK_1_2_3_4_table.bin
 CSF_KEY - full path to the CSF Key CSF1_1_sha256_4096_65537_v3_usr_crt.pem
 IMG_KEY - full path to the IMG Key IMG1_1_sha256_4096_65537_v3_usr_crt.pem

Additionally provide an example of running the csf.sh script.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Tim Harvey 2023-06-15 08:21:08 -07:00 • committed by Stefano Babic
parent 77b5ad0ea3
commit ff1dd52024
4 changed files with 43 additions and 12 deletions
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21
doc/imx/habv4/csf_examples/mx8m/csf.sh
View file

@ -22,6 +22,27 @@
cp doc/imx/habv4/csf_examples/mx8m/csf_spl.txt csf_spl.tmp
cp doc/imx/habv4/csf_examples/mx8m/csf_fit.txt csf_fit.tmp
# update File Paths from env vars
if ! [ -r $CSF_KEY ]; then
echo "Error: \$CSF_KEY not found"
exit 1
fi
if ! [ -r $IMG_KEY ]; then
echo "Error: \$IMG_KEY not found"
exit 1
fi
if ! [ -r $SRK_TABLE ]; then
echo "Error: \$SRK_TABLE not found"
exit 1
fi
sed -i "s:\$CSF_KEY:$CSF_KEY:" csf_spl.tmp
sed -i "s:\$IMG_KEY:$IMG_KEY:" csf_spl.tmp
sed -i "s:\$SRK_TABLE:$SRK_TABLE:" csf_spl.tmp
sed -i "s:\$CSF_KEY:$CSF_KEY:" csf_fit.tmp
sed -i "s:\$IMG_KEY:$IMG_KEY:" csf_fit.tmp
sed -i "s:\$SRK_TABLE:$SRK_TABLE:" csf_fit.tmp
# update SPL Blocks
spl_block_base=$(printf "0x%x" $(( $(sed -n "/CONFIG_SPL_TEXT_BASE=/ s@.*=@@p" .config) - 0x40)) )
spl_block_size=$(printf "0x%x" $(stat -tc %s u-boot-spl-ddr.bin))
sed -i "/Blocks = / s@.*@ Blocks = $spl_block_base 0x0 $spl_block_size \"flash.bin\"@" csf_spl.tmp

12
doc/imx/habv4/csf_examples/mx8m/csf_fit.txt
View file

@ -7,21 +7,21 @@
Signature Format = CMS
[Install SRK]
# FIXME: Adjust path here
File = "/path/to/cst-3.3.1/crts/SRK_1_2_3_4_table.bin"
# SRK_TABLE is full path to SRK_1_2_3_4_table.bin
File = "$SRK_TABLE"
Source index = 0
[Install CSFK]
# FIXME: Adjust path here
File = "/path/to/cst-3.3.1/crts/CSF1_1_sha256_4096_65537_v3_usr_crt.pem"
# CSF_KEY is full path to CSF1_1_sha256_4096_65537_v3_usr_crt.pem
File = "$CSF_KEY"
[Authenticate CSF]
[Install Key]
Verification index = 0
Target Index = 2
# FIXME: Adjust path here
File = "/path/to/cst-3.3.1/crts/IMG1_1_sha256_4096_65537_v3_usr_crt.pem"
# IMG_KEY is full path to IMG1_1_sha256_4096_65537_v3_usr_crt.pem
File = "$IMG_KEY"
[Authenticate Data]
Verification index = 2

12
doc/imx/habv4/csf_examples/mx8m/csf_spl.txt
View file

@ -7,13 +7,13 @@
Signature Format = CMS
[Install SRK]
# FIXME: Adjust path here
File = "/path/to/cst-3.3.1/crts/SRK_1_2_3_4_table.bin"
# SRK_TABLE is full path to SRK_1_2_3_4_table.bin
File = "$SRK_TABLE"
Source index = 0
[Install CSFK]
# FIXME: Adjust path here
File = "/path/to/cst-3.3.1/crts/CSF1_1_sha256_4096_65537_v3_usr_crt.pem"
# CSF_KEY is full path to CSF1_1_sha256_4096_65537_v3_usr_crt.pem
File = "$CSF_KEY"
[Authenticate CSF]
@ -24,8 +24,8 @@
[Install Key]
Verification index = 0
Target Index = 2
# FIXME: Adjust path here
File = "/path/to/cst-3.3.1/crts/IMG1_1_sha256_4096_65537_v3_usr_crt.pem"
# IMG_KEY is full path to IMG1_1_sha256_4096_65537_v3_usr_crt.pem
File = "$IMG_KEY"
[Authenticate Data]
Verification index = 2

10
doc/imx/habv4/guides/mx8m_spl_secure_boot.txt
View file

@ -207,6 +207,16 @@ dd if=csf_fit.bin of=flash.bin bs=1 seek=${csf_block_offset} conv=notrunc
```
The entire script is available in doc/imx/habv4/csf_examples/mx8m/csf.sh
and can be used as follows to modify flash.bin to be signed
(adjust paths as needed):
```
export CST_DIR=/usr/src/cst-3.3.1/
export CSF_KEY=$CST_DIR/crts/CSF1_1_sha256_4096_65537_v3_usr_crt.pem
export IMG_KEY=$CST_DIR/crts/IMG1_1_sha256_4096_65537_v3_usr_crt.pem
export SRK_TABLE=$CST_DIR/crts/SRK_1_2_3_4_table.bin
export PATH=$CST_DIR/linux64/bin:$PATH
/bin/sh doc/imx/habv4/csf_examples/mx8m/csf.sh
```
1.4 Closing the device
-----------------------