def generate_keys(key_text):
""" key generation
"""
key = []
for i in key_text:
key.extend(to_binary(ord(i)))
C = []
D = []
r = []
for i in range(28):
C.append(key[PC1_C[i]])
for i in range(28):
D.append(key[PC1_D[i]])
for i in range(0, 16):
if i in [0, 1, 8, 15]:
C = left_shift(C, 1)
D = left_shift(D, 1)
else:
C = left_shift(C, 2)
D = left_shift(D, 2)
CD = []
CD.extend(C)
CD.extend(D)
dummy = []
for i in range(48):
dummy.append(CD[PC2[i]])
r.append(dummy)
return r
def generate_keys(key_text):
#merubah key menjadi biner
key = []
for i in key_text:
key.extend(to_binary(ord(i)))
# print
# print key
C = []
D = []
r = []
# iv_new = []
for i in range(28):
C.append(key[PC1_C[i]])
# print "array C = "
# print C
# print "==="
for i in range(28):
D.append(key[PC1_D[i]])
for i in range(0, 16):
if i in [0, 1, 8, 15]:
C = left_shift(C, 1)
D = left_shift(D, 1)
else:
C = left_shift(C, 2)
D = left_shift(D, 2)
CD = []
CD.extend(C)
CD.extend(D)
dummy = []
for i in range(48):
dummy.append(CD[PC2[i]])
r.append(dummy)
return r
def generate_keys(key_text):
""" key generation
"""
key = []
for i in key_text:
key.extend(to_binary(ord(i)))
C = []
D = []
r = []
for i in range(28):
C.append(key[PC1_C[i]])
for i in range(28):
D.append(key[PC1_D[i]])
for i in range(0, 16):
if i in [0, 1, 8, 15]:
C = left_shift(C, 1)
D = left_shift(D, 1)
else:
C = left_shift(C, 2)
D = left_shift(D, 2)
CD = []
CD.extend(C)
CD.extend(D)
dummy = []
for i in range(48):
dummy.append(CD[PC2[i]])
r.append(dummy)
return r
def split_header_and_content(img):
"""plain text to binary, split header and content for image
"""
text_bits = []
for i in img:
text_bits.extend(to_binary(ord(i)))
header_bits = text_bits[0:HEADER_LENGTH]
text_bits = text_bits[HEADER_LENGTH:]
return header_bits, text_bits
def s_box(block):
#menyimpelkan blok 48bit menjadi 32bit dengan cara membuat tabelnya
#yang bisa paling pinggirnya
for i in range(0, 8):
row = str(block[i][0]) + str(block[i][-1])
column = ''
for j in range(1, 5):
column += str(block[i][j])
a = 16 * get_row(row)
a += get_column(column)
block.pop(i)
block.insert(i, to_binary(ord(chr(s[i][a]))))
r = []
for i in block:
r.extend(i[4:8])
return r
def s_box(block):
"""s-box function to reduce 48 bit block to 32 bit block
"""
for i in range(0, 8):
row = str(block[i][0]) + str(block[i][-1])
column = ''
for j in range(1, 5):
column += str(block[i][j])
a = 16 * get_row(row)
a += get_column(column)
block.pop(i)
block.insert(i, to_binary(ord(chr(s[i][a]))))
r = []
for i in block:
r.extend(i[4:8])
return r
def s_box(block):
"""s-box function to reduce 48 bit block to 32 bit block
"""
for i in range(0, 8):
row = str(block[i][0]) + str(block[i][-1])
column = ''
for j in range(1, 5):
column += str(block[i][j])
a = 16 * get_row(row)
a += get_column(column)
block.pop(i)
block.insert(i, to_binary(ord(chr(s[i][a]))))
r = []
for i in block:
r.extend(i[4:8])
return r
def get_bits(plaintext):
text_bits = []
for i in plaintext:
text_bits.extend(to_binary(ord(i)))
return text_bits
def get_bits(plaintext):
text_bits = []
for i in plaintext:
text_bits.extend(to_binary(ord(i)))
return text_bits