japp

def convertValue(value):
    hexa = intToByte(value)
    hexa = byteToHex(hexa)
    if int(hexa[0],16) >= 8:
        hexa = '00' + hexa
    return hexa

def convertShort(i, length):
    typeInt = hexToByte('02')
    l = intToByte(length//2)
    i = twos_complement(i)
    value = intToByte(i)
    return byteToHex(typeInt + l + value)

def intToByte(integer):
    size = (integer.bit_length() + 7 ) // 8
    if integer == 0:
        size = 1
    four_bytes = integer.to_bytes(size, byteorder='big')
    return four_bytes

def compute(p, q):
    version = 0
    e = 65537
    n = p * q
    d = e**(-1)
    ex1 = d % (p - 1) #exponent1 INTEGER, -- d mod (p-1)
    ex2 = d % (q - 1) #exponent2 INTEGER, -- d mod (q-1)
    coeff = ~q % p #coefficient INTEGER, -- (inverse of q) mod p
    v1 = convertToDER(version)
    e1 = convertToDER(e)
    n1 = convertToDER(n)
    d1 = convertToDER(d)
    ex11 = convertToDER(ex11)
    ex21 = convertToDER(ex21)
    c1 = convertToDER(c1)
    value = v1+e1+n1+d1+ex11+ex21+c1

    length = len(convertValue(value))
    if lenght < 127:
        lhex = intToByte(length//2)
    else:
        leng = intToByte(length//2)
        size = intToHex(len(leng))
        l = '1' + toBin(size,7)
        lhex= hex(int(l, 2))

    return hexToByte('30' + lhex + value)