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How to use clear_app method in Airtest

Best Python code snippet using Airtest

generate_secureboot_assets.py

Source:generate_secureboot_assets.py

1#!/usr/bin/env python32import argparse3import sys4import os5# This key table has to match the one in bootloader6keyTbl = [0xDEADBEEF, 0xAAAAAAAA, 0x11111111, 0x00000000, 0xFFFFFFFF, 0x55555555, 0xA5A5A5A5, 0x66666666]7#******************************************************************************8#9# Main function10#11#******************************************************************************12def main():13    # Read the binary file from the command line.14    with open(args.binfile, mode='rb') as binfile:15        clear_application= binfile.read()16    print('Loading Clear application {} bytes from {}...'.format(len(clear_application), args.binfile), flush=True)17 18    plaintext = pad_to_block_size(clear_application, 4)19    ivVal = word_from_bytes(os.urandom(4), 0)20    print("Initialization Vector")21    print(hex(ivVal))22    application = encrypt_app(args.keyidxVal, plaintext, ivVal)23    trailer = sec_trailer(args.keyidxVal, plaintext, ivVal, int(args.protectionVal, 0))24    print('Saving encrypted image {} bytes to {}...'.format(len(application), args.encimagefile), flush=True)25    with open(args.encimagefile, mode='wb') as encimagefile:26        encimagebytearray = bytearray(application)27        encimagefile.write(encimagebytearray)28    print('Saving security trailer {} bytes to {}...'.format(len(trailer), args.sectrailerfile), flush=True)29    with open(args.sectrailerfile, mode='wb') as sectrailerfile:30        trailerbytearray = bytearray(trailer)31        sectrailerfile.write(trailerbytearray)32    print('Done.')33#******************************************************************************34#35# Turn a 32-bit number into a series of bytes for transmission.36#37# This command will split a 32-bit integer into an array of bytes, ordered38# LSB-first for transmission over the UART.39#40#******************************************************************************41def int_to_bytes(n):42    A = [n & 0xFF,43         (n >> 8) & 0xFF,44         (n >> 16) & 0xFF,45         (n >> 24) & 0xFF]46    return A47#******************************************************************************48#49# Extract a word from a byte array50#51#******************************************************************************52def word_from_bytes(B, n):53    return (B[n] + (B[n + 1] << 8) + (B[n + 2] << 16) + (B[n + 3] << 24))54#******************************************************************************55#56# CRC function that matches the CRC used by the Apollo bootloader.57#58#******************************************************************************59poly32 = 0x1EDC6F4160def crc32(L):61    rem = 062    for b in L:63        rem = rem ^ (b << 24)64        for i in range(8):65            if rem & 0x80000000:66                rem = ((rem << 1) ^ poly32)67            else:68                rem = (rem << 1)69            rem = rem & 0xFFFFFFFF70    return rem71def pad_to_block_size(text, block_size):72    text_length = len(text)73    amount_to_pad = block_size - (text_length % block_size)74    if amount_to_pad == 0:75        amount_to_pad = block_size76    for i in range(0, amount_to_pad, 1):77        text += bytes(chr(amount_to_pad), 'ascii')78    return text79def encrypt_app(keyidx, clear_app, iv):80    key32 = keyTbl[keyidx]81    applen = len(clear_app)82    enc_app = []83    for i in range(0, applen, 4):84        word = word_from_bytes(clear_app, i)85        word = (word ^ iv) ^ key3286        iv = word87        enc_app.extend(int_to_bytes(word))88    return enc_app89def sec_trailer(keyidx, clear_app, iv, protection):90    key32 = keyTbl[keyidx]91    secTrailer = []92    secTrailer.extend(int_to_bytes(keyidx))93    secTrailer.extend(int_to_bytes(protection))94    applen = len(clear_app)95    secTrailer.extend(int_to_bytes(applen))96    crc = crc32(clear_app)97    sig = key32 ^ crc98    secTrailer.extend(int_to_bytes(sig))99    secTrailer.extend(int_to_bytes(iv))100    # Trailer Signature101    secTrailerSig = crc32(secTrailer) ^ key32102    secTrailer.extend(int_to_bytes(secTrailerSig))103    return secTrailer104#******************************************************************************105#106# Main program flow107#108#******************************************************************************109if __name__ == '__main__':110    parser = argparse.ArgumentParser(description =111                                     'Secure Image generation utility for Apollo or Apollo2')112    parser.add_argument('binfile',113                        help = 'Binary file to program into the target device')114    parser.add_argument('keyidxVal', default=0, type=int, help = 'encryption key index')115 116    parser.add_argument('protectionVal', default=0, help = 'Image Protection Value (hex)')117    parser.add_argument('encimagefile', help = 'Destination file for Encrypted image')118    parser.add_argument('sectrailerfile', help = 'Destination file for security trailer')119    args = parser.parse_args()...

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