mirror of
https://github.com/raspberrypi/rpi-eeprom.git
synced 2026-01-20 21:13:36 +08:00
0ebda77d49
Copy the tools from usbboot. The next step is for usbboot to include rpi-eeprom as a git submodule to de-duplicate EEPROM images and tools.
50 lines
1.4 KiB
Python
Executable File
50 lines
1.4 KiB
Python
Executable File
#!/usr/bin/env python3
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import argparse
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import struct
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import sys
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from Cryptodome.PublicKey import RSA
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def bintopem(infile, outf):
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f = open(infile, 'rb')
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arr = f.read(264)
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n = int.from_bytes(struct.unpack_from("256B", arr, 0), 'little')
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e = struct.unpack_from("<Q", arr, 256)[0]
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pubkey = RSA.construct((n, e))
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outf.write(pubkey.exportKey())
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def pemtobin(infile, outf):
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key = RSA.importKey(open(infile, 'r').read())
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if key.size_in_bits() != 2048:
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raise Exception("RSA key size must be 2048")
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# Extract the public key componenet n,e and store as little endian
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outf.write(key.n.to_bytes(256, byteorder='little'))
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outf.write(key.e.to_bytes(8, byteorder='little'))
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def main():
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parser = argparse.ArgumentParser('Converts RSA keys between PEM format and the raw binary format used by the Raspberry Pi 4 bootloader')
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parser.add_argument('input', nargs='+')
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parser.add_argument('--inform', default="pem")
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parser.add_argument('--output', required=False)
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args = parser.parse_args()
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if args.output:
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outf = open(args.output, 'wb')
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else:
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outf = sys.stdout.buffer
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if args.inform == "pem":
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pemtobin(args.input[0], outf)
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elif args.inform == "bin":
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bintopem(args.input[0], outf)
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else:
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raise Exception("Unknown format %s" % args.inform)
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if __name__ == '__main__':
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main()
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