def OFB(data,key,mode,iv):
result=""
keyarray = f_des.key_schedule(key)
for i in range(0,len(data),64):
iv = f_des.DES(iv,keyarray)
result += f_des.xor_func(data[i:i+64],iv)
return result
def OFB(data, key, mode, iv):
result = ""
keyarray = f_des.key_schedule(key)
for i in range(0, len(data), 64):
iv = f_des.DES(iv, keyarray)
result += f_des.xor_func(data[i:i + 64], iv)
return result
def ECB(data,key,mode):
result=""
keyarray = f_des.key_schedule(key)
if mode == "1":
for i in range(0,len(data),64):
result+=f_des.DES(data[i:i+64],keyarray)
else:
for i in range(0,len(data),64):
result+=f_des.de_DES(data[i:i+64],keyarray)
return result
def ECB(data, key, mode):
result = ""
keyarray = f_des.key_schedule(key)
if mode == "1":
for i in range(0, len(data), 64):
result += f_des.DES(data[i:i + 64], keyarray)
else:
for i in range(0, len(data), 64):
result += f_des.de_DES(data[i:i + 64], keyarray)
return result
def CTR(data,key,mode,iv):
def add_1(d):
if d == "1"*64:
return "0"*64
return bin(int(d,2)+1)[2:].zfill(64)
result=""
keyarray = f_des.key_schedule(key)
for i in range(0,len(data),64):
iv = add_1(iv)
tmp = f_des.DES(iv,keyarray)
result += f_des.xor_func(data[i:i+64],tmp)
return result
def CTR(data, key, mode, iv):
def add_1(d):
if d == "1" * 64:
return "0" * 64
return bin(int(d, 2) + 1)[2:].zfill(64)
result = ""
keyarray = f_des.key_schedule(key)
for i in range(0, len(data), 64):
iv = add_1(iv)
tmp = f_des.DES(iv, keyarray)
result += f_des.xor_func(data[i:i + 64], tmp)
return result
def CBC(data,key,mode,iv):
result=""
keyarray = f_des.key_schedule(key)
if mode == "1":
for i in range(0,len(data),64):
tmp = f_des.xor_func(data[i:i+64],iv)
iv = f_des.DES(tmp,keyarray)
result+=iv
else:
for i in range(0,len(data),64):
tmp = f_des.de_DES(data[i:i+64],keyarray)
result += f_des.xor_func(tmp,iv)
iv = data[i:i+64]
return result
def CBC(data, key, mode, iv):
result = ""
keyarray = f_des.key_schedule(key)
if mode == "1":
for i in range(0, len(data), 64):
tmp = f_des.xor_func(data[i:i + 64], iv)
iv = f_des.DES(tmp, keyarray)
result += iv
else:
for i in range(0, len(data), 64):
tmp = f_des.de_DES(data[i:i + 64], keyarray)
result += f_des.xor_func(tmp, iv)
iv = data[i:i + 64]
return result