mirror of
https://github.com/tillitis/tillitis-key1.git
synced 2025-10-31 14:48:54 -04:00
73 lines
2.6 KiB
Python
Executable file
73 lines
2.6 KiB
Python
Executable file
#!/usr/bin/env python3
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# SPDX-FileCopyrightText: 2021 Mullvad VPN AB <mullvad.se>
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# SPDX-FileCopyrightText: 2022 Tillitis AB <tillitis.se>
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# SPDX-License-Identifier: GPL-2.0-only
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def descriptor_to_string(descriptor):
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""" Convert a bytes object containing a USB string descriptor into a python string"""
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bLength = descriptor[0]
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if bLength != len(descriptor):
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raise Exception('Descriptor length mismatch, length_field:{} actual_length:{}'.format(
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bLength,
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len(descriptor)
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))
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bDescriptorType = descriptor[1]
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if bDescriptorType != 0x03:
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raise Exception('Descriptor type mismatch, bDescriptorType:{02x} expected:0x03'.format(
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bDescriptorType
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))
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return descriptor[2:].decode('utf-16', errors='strict')
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def string_to_descriptor(string):
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""" Convert a python string into a bytes object containing a USB string descriptor"""
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descriptor = bytearray()
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descriptor.append(0x00) # Placeholder for length
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descriptor.append(0x03) # Descriptor type (String)
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descriptor.extend(string.encode('utf-16')[2:]) # crop the BOM
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descriptor[0] = len(descriptor) # Set length of this descriptor (in bytes)
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return bytes(descriptor)
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def format_descriptor(name, value):
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descriptor = string_to_descriptor(value)
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formatted = [
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'unsigned char FLASH {}[] = {{ // "{}"'.format(name, value), # Add string as a comment
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' {}, // Length of this descriptor (in bytes)'.format(descriptor[0]),
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' 0x03, // Descriptor type (String)'
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]
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formatted.extend(
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[
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' ' + ', '.join(
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["'{}', 0".format(chr(b)) if b != 0x00 else "0x00" for b in descriptor[2 + i:2 + i + 8:2]]
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) + ','
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for i in range(0, len(descriptor[2:]), 8) # 8 bytes = 4 characters
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]
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)
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formatted.append('};\n')
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return '\n'.join(formatted)
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if __name__ == "__main__":
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strings = {
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"ProdDesc": "MTA1-USB-V1",
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"ManufDesc": "Tillitis",
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"SerialDesc": "68de5d27-e223-4874-bc76-a54d6e84068f",
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"CdcCtrlInterfaceDesc": "CDC-Ctrl",
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"CdcDataInterfaceDesc": "CDC-Data",
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"FidoInterfaceDesc": "FIDO",
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"DebugInterfaceDesc": "DEBUG"
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}
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with open('inc/usb_strings.h', 'w') as f:
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f.write('#ifndef __USB_STRINGS_H__\n')
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f.write('#define __USB_STRINGS_H__\n')
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f.write('\n')
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f.write('#include "mem.h"\n')
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f.write('\n')
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for name, value in strings.items():
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f.write(format_descriptor(name, value) + '\n')
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f.write('#endif\n')
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