from binario import*
from file    import*
#Nao mexam
#Comprimento da chave (palavras Nk)	
# Numero de rodadas  (Nr)	 
#Exp. Tamanho da chave (Nb (Nr + 1) palavras)
#Nb=4
#Como a chave e de 128 bits, Nr=(Nk+6)=10, Nk=tamanhoDaPalavra/32, Expansao da Palavra= (4)*(10+1)=44
Rcon = [
    0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40,
    0x80, 0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A,
    0x2F, 0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A,
    0xD4, 0xB3, 0x7D, 0xFA, 0xEF, 0xC5, 0x91, 0x39,
]
Sbox = [
    [0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76],
    [0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0],
    [0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15],
    [0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75],
    [0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84],
    [0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF],
    [0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8],
    [0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2],
    [0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73],
    [0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB],
    [0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79],
    [0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08],
    [0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A],
    [0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E],
    [0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF],
    [0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16]
]
def  separaBytes2 (lista):
    listaFinal = []
    a=0
    b=8
    for x in range(0,4):
     listaFinal.append(lista[a:b])
     a=a+8
     b=b+8
    return listaFinal
def substituicaoBytes (lista):
    for x in xrange(0,4):
        lista[x]= string_to_bit_array(chr(Sbox[bit_to_int(lista[0:4])][bit_to_int(lista[4:8])]))
def deslocamentoLinhas (lista):
    lista[4],lista[5],lista[6],lista[7]= lista[5],lista[6],lista[7],lista[4]
    lista[8],lista[9],lista[10],lista[11]= lista[10],lista[11],lista[8],lista[9]
    lista[12],lista[13],lista[14],lista[15]= lista[15],lista[12],lista[13],lista[14]
def rotacionaEsquerda(chave):
   #Concatena uma lista que comeca na posicao 8 da lista inicial e vai ate o fim, com uma lista
   #que comeca da posicao 0 e vai ate a posicao 7
   y=8
   return chave[y:] + chave[:y] 
def condensaChave(chave1, chave2,chave3,chave4):
    lista=[]
    lista=[chave1]+[chave2]+[chave3]+[chave4]
    return lista
def keyExpansion(chaveK):
    chave=separabytes(chaveK)
    nr=10
    nk=4
    nb=4
    w=[]
    chaves=[]
    for k in range(0,11):
        chaves=chaves+[0]
    for k in range(0,44):
        w=w+[0]
    for x in range(0,4):
        w[x]=chave[4*x]+chave[(4*x)+1]+chave[(4*x)+2]+chave[(4*x)+3]
    for y in range(4,44):
        aux=w[y-1]
        if(y%nk==0):
            aux2=rotacionaEsquerda(aux)
            aux2=separaBytes2(aux2)
            substituicaoBytes(aux2)
            aux=aux2[0]+aux2[1]+aux2[2]
            x=int_to_bit(Rcon[y/4])
            x=xor(aux2[3],x)
            aux=aux+x
        w[y]=xor(w[y-4],aux)
    for x in range(0,11):
        chaves[x]=w[4*x]+w[4*x+1]+w[4*x+2]+w[4*x+3]
    return chaves

