python - Python 实施 DES 加密花费异常时间来加密 1 mb 文本文件

# DES implimentation , by Spencer Little, mrlittle@uw.edu import re s_boxs = [ [[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7], [0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8], [4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0], [15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13], ], [[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10], [3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5], [0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15], [13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9], ], [[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8], [13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1], [13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7], [1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12], ], [[7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15], [13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9], [10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4], [3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14], ], [[2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9], [14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6], [4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14], [11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3], ], [[12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11], [10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8], [9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6], [4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13], ], [[4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1], [13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6], [1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2], [6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12], ], [[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7], [1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2], [7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8], [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11], ] ] def byter_to_list(byter, as_byte = True): bits = [] bitsfix = [] as_bits = [] for num in byter: # parse our byte array bits.append(str(bin(num))) for bites in bits: # add zeros the left, fix size of the bits in bytes byte = bites[2:] while len(byte)!=8: zeros = "0"*(8-len(byte)) byte = zeros + byte bitsfix.append(byte) if not as_byte: for byte in bitsfix: for bit in byte: as_bits.append(bit) return as_bits return bitsfix def exp_box(r_bytes): r_byt_exp = [] e_box = [32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1] for pos in e_box: r_byt_exp.append(r_bytes[pos-1]) return r_byt_exp def xor_w_key(right_bits, key): xored_l = [] for i in range(len(right_bits)): xored_l.append(right_bits[i] ^ key[i]) return xored_l def s_boxes(right_b): P = [16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25] right_byts = [] right_bits = "" right_bit_six = [] s_row_col = [] s_out = [] s_out_bits = "" p_out = [] ind = 0 for num in right_b: bits = format(num, 'b') if len(bits)!=8: zeros = '0'*(8-len(bits)) bits = zeros + bits right_byts.append(bits) for byt in right_byts: for bit in byt: right_bits += bit for i in range(int(len(right_bits)/6)): right_bit_six.append(right_bits[ind:(i+1)*6]) ind = (i+1)*6 for six_bit in right_bit_six: row = six_bit[0]+six_bit[5] column = six_bit[1:5] row_c = [int(row, 2), int(column, 2)] s_row_col.append(row_c) for i in range(8): # 0 is row, 1 is col s_int = s_boxs[i][(s_row_col[i][0])][(s_row_col[i][1])] s_out.append(s_int) for num in s_out: bits = format(num, 'b') if len(bits)<4: zeros = '0'*(8-len(bits)) bits = zeros + bits while len(bits)>4: bits = bits[1:] s_out_bits += bits for pos in P: p_out.append(s_out_bits[pos-1]) return p_out def bit_shift_left(bits): # shifts bits, takes list of bits bits_l = [] for i in range(len(bits)): if i==len(bits)-1: bits_l.append(bits[0]) else: bits_l.append(bits[i+1]) return bits_l def bits_to_int(bits): # bits to intergers, takes list of bits byte_l = [] byte_st = [] bits_int = [] ind = 0 for i in range(int(len(bits)/8)): byte_l.append(bits[ind:(i+1)*8]) ind = (i+1)*8 for byte in byte_l: strbyte = "" for bit in byte: strbyte+=bit byte_st.append(strbyte) for byte in byte_st: bits_int.append(int(byte, 2)) return bits_int def init_perm(byter1): # initial permuattion, takes 8 bytes in a byte array perm_seq = [58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7] blocks = [] IPbits = [] bitsfix = byter_to_list(byter1) # PKCS5 Padding if len(bitsfix)!=8: # <------ probably want to rethink this padding req_byts = 8 - len(bitsfix) pad = str(bin(req_byts))[2:] if len(pad)!=8: zeros = "0"*(8-len(pad)) pad = zeros + pad for i in range(req_byts): bitsfix.append(pad) for byte in bitsfix: for bit in byte: blocks.append(bit) for ind in perm_seq: IPbits.append(blocks[ind-1]) return IPbits def key_perm(key, perm_num): # key as byetarray, perm_num as int c_blk = [] d_blk = [] c_sub = [57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36] d_sub = [63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4] pc_2 = [14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32] key_bits = [] par = [] key_n = [] cd_blk = [] l_shfts = [1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1] # or these could be cumulative but that would be less efficient key_bytes = byter_to_list(key) for byte in key_bytes: # saving parity bits par.append(byte[7]) for byte in key_bytes: for bit in byte: key_bits.append(bit) for i in range(28): c_blk.append(key_bits[c_sub[i]]) d_blk.append(key_bits[d_sub[i]]) for i in range(perm_num): for shift in range(l_shfts[i]): # cumulative approach, assuming shifts remain after each round c_blk = bit_shift_left(c_blk) d_blk = bit_shift_left(d_blk) cd_blk = c_blk + d_blk for pos in pc_2: key_n.append(cd_blk[pos-1]) key_n = bits_to_int(key_n) return key_n # return as intergers for xoring def main_crypt_seq(bytes_crypt, key, e_c): # takes ints as byes, and key as bytearray p_i = [40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25] pad_pattern = r"(.*,+(2,){2,2}|.*,+(3,){3,3}|.*,+(4,){4,4}|.*,+(5,){5,5}|.*,+(6,){6,6}|.*,+(7,){7,7})$" bytes_crypt = init_perm(bytes_crypt) # inital permuattion if len(bytes_crypt)!=64: print("Something is wrong. Input not 8 bytes") return 1 lr_bits = [] left_bits = bytes_crypt[0:32] right_bits = bytes_crypt[32:] out_bits = [] out_bits_int = [] o_bits_str = "" round_rng = range(16) if e_c==True else range(15, -1, -1) stop = 15 if e_c==True else 0 for i in round_rng: temp = exp_box(right_bits) temp = xor_w_key(bits_to_int(temp), key_perm(key, i)) temp = s_boxes(temp) left_bits = xor_w_key(bits_to_int(left_bits), bits_to_int(temp)) left_bits = byter_to_list(left_bits, False) if i == stop: break place_hld = right_bits right_bits = left_bits left_bits = place_hld lr_bits = left_bits + right_bits for pos in p_i: # final permutation out_bits.append(lr_bits[pos-1]) out_bits_int = bits_to_int(out_bits) for num in out_bits_int: # see if there is more efficient way to do this o_bits_str += str(num) + "," # if only one byte is padded, it remains after decryption if re.match(pad_pattern, o_bits_str): # check for padding and remove for i in range(o_bits_str[-2]): # should I only check last 64 bits of file? out_bits_int.pop(-1) out_bytes = bytearray(out_bits_int) return out_bytes def main_crypt_trp(bytes_crypt, key, e_c): if e_c: enc_byte = main_crypt_seq(bytes_crypt, key[:8], True) enc_byte = main_crypt_seq(enc_byte, key[8:16], False) enc_byte = main_crypt_seq(enc_byte, key[16:], True) else: enc_byte = main_crypt_seq(bytes_crypt, key[16:], False) enc_byte = main_crypt_seq(enc_byte, key[8:16], True) enc_byte = main_crypt_seq(enc_byte, key[:8], False) return enc_byte def des_3des_encrypt(key_u, enc_file, mode): key = [] for val in key_u: # key can be int array of bytearray if val not in list(range(10)): # simplest to use interger array key.append(ord(val)) else: key.append(val) encrypt = 1 wrt_file = enc_file + ".encrypted_des" byte_r = [] enc_byte_r = [] with open(enc_file, 'rb') as textf: bytef = textf.read(8) while bytef: #print(bytef) byte_r.append(bytef) bytef = textf.read(8) for fbytes in byte_r: if mode: enc_byte_r.append(main_crypt_trp(fbytes, key, encrypt)) else: enc_byte_r.append(main_crypt_seq(fbytes, key, encrypt)) with open(wrt_file, 'wb') as wrtf: for fbytes in enc_byte_r: wrtf.write(fbytes)

import os import time from datetime import datetime from PythonEncryption import des MB = 1024 * 1024 # file_list = ["1mb_input.txt", "2mb_input.txt", "5mb_input.txt", "50mb_input.txt", "500mb_input.txt", "1gb_input.txt"] file_list = ["1mb_input.txt"] # file_size = [1,2,5,50,500,1024] file_size = [1] print("##----------------------------------------------------##") def createFile(name, size): data = "d" * (int(size / 2) - 1) arr = bytearray(data, 'utf-16') with open(name, 'wb') as f: f.write(arr) file_size = os.stat(name).st_size print("##-------File created of ", file_size / MB, " MB size----------------##\n") # Creating files of various sizes 1MB, 2MB, 5MB, 50MB, 500MB, 1GB for i in range(0, len(file_list)): createFile(file_list[i], file_size[i] * MB) # output file output_file = open("Execute_Test.txt", "w") # -------------- # DES Encryption # -------------- output_file.write("##----------------------------------------------------##\n") output_file.write("##---------------DES Encryption-----------------------##\n") output_file.write("##----------------------------------------------------##\n") print("##----------------------------------------------------##") print("##--------------------DES Encryption------------------##") print("##----------------------------------------------------##") keys = 'r4u7x!A%' out = " ##----- " + str(64) + " Bit -----##\n" print(" ##----- " + str(64) + " Bit -----##") print(" ##----------------------##") # for output output_file.writelines(out) print(" Key = ", keys) for k in range(0, len(file_list)): out = " ## File Name: " + file_list[k] + " and file size = " + str(file_size[k]) + " MB ##\n" print(" ## File Name: " + file_list[k] + " and file size = " + str(file_size[k]) + " MB ##") output_file.writelines(out) start = datetime.now() des.des_3des_encrypt(keys, file_list[k], 0) end = datetime.now() exe_time = end - start out = " Execution Time is " + str(exe_time) + " in hh:mm:ss:msms \n" print(" Execution Time is " + str(exe_time) + " in hh:mm:ss:msms") output_file.writelines(out) print(" file finished: ", exe_time, "\n") # hour:minute:second:microsecond output_file.close()