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1 - AHAB signature block parser:
This tool is developed to assist users to parse the AHAB signature block
from a signed container image. The tool also generates the certificates,
signatures, SRK table and SRK Hash.
2 - Requirements:
python3 ($ apt-get install python3)
python-cryptography ($ pip3 install cryptography)
3 - Usage:
$ python3 parse_sig_blk.py <filepath> <offset>
filepath: Path for image container binary to be analyzed.
offset: Container header offset in binary
Note: Only one container header can be parsed at once.
The tool creates a output directory with the following contents:
IMG_sign.bin - Container header signature
SGK_cert.bin - SGK key certificate (If included)
SGK_sign.bin - SGK key signature (If included)
SRKHash.bin - SRK hash fuses
SRKTable.bin - SRK table
4 - Example:
Usage example based in 2nd container of a L4.19.35_1.1.0 i.MX8QM image:
$ python3 parse_sig_blk.py flash.bin 0x400
$ tree
└── output
├── IMG_sign.bin
├── SGK_cert.bin
├── SGK_sign.bin
├── SRKHash.bin
└── SRKTable.bin
5 - Contents:
parse_sig_blk.py - Program to parse signature block in the boot image
common.py - Definitions and common functions
README - This file
6 - Release Notes:
CST 3.3.0 - Initial version
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