def strxor( str , key , len ):
out = ""
for i in range ( 0 , len ):
ch = ord(str[i]) ^ ord(key[i])
out = out + chr(ch)
return out
def dec_to_hex( string ):
out = ""
for i in range ( 0 , len(string) ):
out = out + " " + hex(ord( string[i] ))
return out
def strshift( string , bit ):
byte = bit // 8
bit = bit % 8
out = ""
if bit == 0 :
out = string[byte:] + string[:byte]
else :
reg = string[byte:] + string[:byte+1]
for i in range (0,len(reg)-1):
out = out + chr(((ord(reg[i])*(2**bit))+(ord(reg[i+1])//(2**(8-bit))))%256)
out = out[:len(string)]
return out
def SearchSbox( reg , Act ):
out = ""
Sbox = ['\xd6' , '\x90' , '\xe9' , '\xfe' , '\xcc' , '\xe1' , '\x3d' , '\xb7' , '\x16' , '\xb6' , '\x14' , '\xc2' , '\x28' , '\xfb' , '\x2c' , '\x05',
'\x2b' , '\x67' , '\x9a' , '\x76' , '\x2a' , '\xbe' , '\x04' , '\xc3' , '\xaa' , '\x44' , '\x13' , '\x26' , '\x49' , '\x86' , '\x06' , '\x99',
'\x9c' , '\x42' , '\x50' , '\xf4' , '\x91' , '\xef' , '\x98' , '\x7a' , '\x33' , '\x54' , '\x0b' , '\x43' , '\xed' , '\xcf' , '\xac' , '\x62',
'\xe4' , '\xb3' , '\x1c' , '\xa9' , '\xc9' , '\x08' , '\xe8' , '\x95' , '\x80' , '\xdf' , '\x94' , '\xfa' , '\x75' , '\x8f' , '\x3f' , '\xa6',
'\x47' , '\x07' , '\xa7' , '\xfc' , '\xf3' , '\x73' , '\x17' , '\xba' , '\x83' , '\x59' , '\x3c' , '\x19' , '\xe6' , '\x85' , '\x4f' , '\xa8',
'\x68' , '\x6b' , '\x81' , '\xb2' , '\x71' , '\x64' , '\xda' , '\x8b' , '\xf8' , '\xeb' , '\x0f' , '\x4b' , '\x70' , '\x56' , '\x9d' , '\x35',
'\x1e' , '\x24' , '\x0e' , '\x5e' , '\x63' , '\x58' , '\xd1' , '\xa2' , '\x25' , '\x22' , '\x7c' , '\x3b' , '\x01' , '\x21' , '\x78' , '\x87',
'\xd4' , '\x00' , '\x46' , '\x57' , '\x9f' , '\xd3' , '\x27' , '\x52' , '\x4c' , '\x36' , '\x02' , '\xe7' , '\xa0' , '\xc4' , '\xc8' , '\x9e',
'\xea' , '\xbf' , '\x8a' , '\xd2' , '\x40' , '\xc7' , '\x38' , '\xb5' , '\xa3' , '\xf7' , '\xf2' , '\xce' , '\xf9' , '\x61' , '\x15' , '\xa1',
'\xe0' , '\xae' , '\x5d' , '\xa4' , '\x9b' , '\x34' , '\x1a' , '\x55' , '\xad' , '\x93' , '\x32' , '\x30' , '\xf5' , '\x8c' , '\xb1' , '\xe3',
'\x1d' , '\xf6' , '\xe2' , '\x2e' , '\x82' , '\x66' , '\xca' , '\x60' , '\xc0' , '\x29' , '\x23' , '\xab' , '\x0d' , '\x53' , '\x4e' , '\x6f',
'\xd5' , '\xdb' , '\x37' , '\x45' , '\xde' , '\xfd' , '\x8e' , '\x2f' , '\x03' , '\xff' , '\x6a' , '\x72' , '\x6d' , '\x6c' , '\x5b' , '\x51',
'\x8d' , '\x1b' , '\xaf' , '\x92' , '\xbb' , '\xdd' , '\xbc' , '\x7f' , '\x11' , '\xd9' , '\x5c' , '\x41' , '\x1f' , '\x10' , '\x5a' , '\xd8',
'\x0a' , '\xc1' , '\x31' , '\x88' , '\xa5' , '\xcd' , '\x7b' , '\xbd' , '\x2d' , '\x74' , '\xd0' , '\x12' , '\xb8' , '\xe5' , '\xb4' , '\xb0',
'\x89' , '\x69' , '\x97' , '\x4a' , '\x0c' , '\x96' , '\x77' , '\x7e' , '\x65' , '\xb9' , '\xf1' , '\x09' , '\xc5' , '\x6e' , '\xc6' , '\x84',
'\x18' , '\xf0' , '\x7d' , '\xec' , '\x3a' , '\xdc' , '\x4d' , '\x20' , '\x79' , '\xee' , '\x5f' , '\x3e' , '\xd7' , '\xcb' , '\x39' , '\x48']
if Act == 1 :
for i in range (0,4) :
out = out + Sbox[ord(reg[i])]
else :
for i in range (0,4) :
out = out + chr(Sbox.index(reg[i]))
return reg
def secret( Attr , RK ,Act, i ) :
if Act==1:
reg = strxor( strxor( Attr[4:8] , Attr[8:12] , 4 ) , strxor( Attr[12:16] , RK[i] , 4 ) , 4 )
reg = SearchSbox ( reg , 1 )
else:
reg = strxor( strxor( Attr[4:8] , Attr[8:12] , 4 ) , strxor( Attr[12:16] , RK[31-i] , 4 ) , 4 )
reg = SearchSbox ( reg , -1 )
reg = strxor( strxor( strxor( reg , strshift(reg,2) , 4 ) , strxor( strshift(reg,10) , strshift(reg,18) , 4 ) , 4 ) , strshift(reg,24) , 4 )
Attr = Attr[4:16] + strxor(Attr[0:4],reg,4)
return Attr
def turnkey( Attr , CK , i ) :
reg = strxor( strxor( Attr[4:8] , Attr[8:12] , 4 ) , strxor( Attr[12:16] , CK[i] , 4 ) , 4 )
reg = SearchSbox ( reg , 1)
reg = strxor( strxor( reg , strshift(reg,13) , 4 ) , strshift(reg,23) , 4 )
Attr = Attr[4:16] + strxor(Attr[0:4],reg,4)
return Attr
CK = [ '\x00\x07\x0e\x15' , '\x1c\x23\x2a\x31' , '\x38\x3f\x46\x4d' , '\x54\x5b\x62\x69' , '\x70\x77\x7e\x85' , '\x8c\x93\x9a\xa1' , '\xa8\xaf\xb6\xbd' , '\xc4\xcb\xd2\xd9' ,
'\xe0\xe7\xee\xf5' , '\xfc\x03\x0a\x11' , '\x18\x1f\x26\x2d' , '\x34\x3b\x42\x49' , '\x50\x57\x5e\x65' , '\x6c\x73\x7a\x81' , '\x88\x8f\x96\x9d' , '\xa4\xab\xb2\xb9' ,
'\xc0\xc7\xce\xd5' , '\xdc\xe3\xea\xf1' , '\xf8\xff\x06\x0d' , '\x14\x1b\x22\x29' , '\x30\x37\x3e\x45' , '\x4c\x53\x5a\x61' , '\x68\x6f\x76\x7d' , '\x84\x8b\x92\x99' ,
'\xa0\xa7\xae\xb5' , '\xbc\xc3\xca\xd1' , '\xd8\xdf\xe6\xed' , '\xf4\xfb\x02\x09' , '\x10\x17\x1e\x25' , '\x2c\x33\x3a\x41' , '\x48\x4f\x56\x5d' , '\x64\x6b\x72\x79' ]
MK = ""
while len(MK) < 16 :
MK = input( "请输入主密钥：" )
if len(MK) >= 16 :
MK = MK[0:16]
else :
MK=MK.ljust(16,'0')
FK0 = [0xA3,0xB1,0xBA,0xC6]
FK1 = [0x56,0xAA,0x33,0x50]
FK2 = [0x67,0x7D,0x91,0x97]
FK3 = [0xB2,0x70,0x22,0xDC]
FK=chr(FK0[0])+chr(FK0[1])+chr(FK0[2])+chr(FK0[3])+chr(FK1[0])+chr(FK1[1])+chr(FK1[2])+chr(FK1[3])+chr(FK2[0])+chr(FK2[1])+chr(FK2[2])+chr(FK2[3])+chr(FK3[0])+chr(FK3[1])+chr(FK3[2])+chr(FK3[3])
RK = []
Attr = strxor( MK , FK , 16 )
for i in range (0,32):
Attr = turnkey( Attr , CK , i )
RK.append( Attr[12:16] )
plain = ""
plain=input("请输入明文：")
j=0
k=(len(plain)+15)//16
earlylen=len(plain)
while j<k:
if len(plain)<k*16:
plain=plain.ljust(k*16,'0')
Attr=plain[16*j:16*j+16]
for i in range (0,32) :
Attr = secret( Attr , RK , 1 , i )
cipher = Attr[12:16] + Attr[8:12] + Attr[4:8] + Attr[0:4]
#print( "密文用十六进制表示为：" , dec_to_hex(cipher) )
print("第",j,"组密文为:",cipher)
Attr = cipher
for i in range (0,32) :
Attr = secret( Attr , RK , 0 , i )
plain_2 = Attr[12:16] + Attr[8:12] + Attr[4:8] + Attr[0:4]
if j==k-1:
print("第",j,"组解密后的明文为：",plain_2[0:earlylen-16*(k-1)])
else:
print("第",j,"组解密后的明文为：",plain_2)
j=j+1
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