Created
May 16, 2020 21:26
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Bank Statement Decoder
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import png | |
import struct | |
def print_list(thelist, quantity): | |
if (quantity == 0): | |
quantity = len(thelist) | |
#print ("Decimal: ", end="") | |
#for i in range(0, quantity): | |
# print (thelist[i], ", ", end="") | |
#print ("") | |
print ("Hex: ", end="") | |
for i in range(0, quantity): | |
print (hex(thelist[i]), ", ", end="") | |
print ("") | |
print ("ASCII: ", end="") | |
for i in range(0, quantity): | |
print (chr(thelist[i]), ", ", end="") | |
print ("") | |
############ | |
filename = "79fb5.bmp" | |
# 0x0 , 0x58 , 0x0 , 0x41 , 0x0 , 0x64 , 0x0 , 0x67 , 0x0 , 0x57 , 0x0 , 0x6b , 0x0 , 0x4b | |
plain_key = "XAdgWkK" | |
key = bytearray(plain_key.encode("utf-16be")) | |
print_len = 50 | |
print ("Key: ") | |
print_list(key, 0) | |
print ("Key len: ", len(key)) | |
## | |
#### Load PNG | |
bmp_full_data = png.Reader(filename=filename).read() | |
bmp_img_data = list(bmp_full_data[2]) | |
## | |
#### Reverse Start | |
data_array = [] | |
output_array = [] | |
print ("") | |
print ("Loading Image data") | |
print ("IMG height: ", len(bmp_img_data)) | |
row_count = 0 | |
#print ("Row: ", i, len(bmp_img_data[i]), end='') | |
while (row_count < len(bmp_img_data[0])-4): | |
#print (row_count, " ", end="") | |
for i in range(0,len(bmp_img_data)): | |
# AARRGGBB | |
R = bmp_img_data[i][row_count] # 05 | |
G = bmp_img_data[i][row_count+1] # 16 | |
B = bmp_img_data[i][row_count+2] # 01 | |
A = bmp_img_data[i][row_count+3] # 00 | |
data_array.append(B) | |
data_array.append(G) | |
data_array.append(R) | |
data_array.append(A) | |
row_count += 4 | |
#print (".. row loaded") | |
print ("1st bytes") | |
print_list(data_array[:4], 4) | |
first_bytes_value = struct.unpack("<I", bytearray(data_array[0:4]))[0] | |
decode_data = data_array[4:] | |
## | |
#### XOR_DEC Start | |
key_counter = 0 | |
print ("Data Length: ", len(data_array)) | |
print ("") | |
print ("Pre XORed data") | |
print_list(decode_data, 50) | |
outfile = open ("test-prexor.bin", 'wb') | |
outfile.write(bytearray(decode_data)) | |
outfile.close() | |
print ("") | |
print ("XORing Image data") | |
# below is either B5 or 00 ^ 112 | |
key_modifier = 0xb5 ^ 112 # 0xc5 | |
#key_modifier = decode_data[len(decode_data)-1] ^ 112 | |
#key_modifier = 0 | |
print(len(decode_data)-1, hex(decode_data[len(decode_data)-1]), key_modifier) | |
key_counter = 0 | |
for xor_i in range(0,len(decode_data)): | |
key_value = key[key_counter] | |
output_array.append(decode_data[xor_i] ^ key_modifier ^ key_value) | |
if (key_counter < len(plain_key)-1): | |
key_counter += 1 | |
else: | |
key_counter = 0 | |
print ("Final Output") | |
print_list(output_array, print_len) | |
outfile = open ("test-postxor.bin", 'wb') | |
outfile.write(bytearray(output_array)) | |
outfile.close() |
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