def cryptBlock(mess, key, direction="enc"):
if makeReport:
reporter.count += 1
reporter.openHandle()
# adding zeros to the end of the last block
numZerosToAdd = blockSize - cryptBlocks.getSizeOfBlock(mess)
mess = cryptBlocks.addZeros(mess, numZerosToAdd)
if makeReport:
reporter.add("S-box(таблица замен):<br><table><tr><td> </td><td>0</td><td>1</td><td>2</td><td>3</td><td>4</td><td>5</td><td>6</td><td>7</td><td>8</td><td>9</td><td>a</td><td>b</td><td>c</td><td>d</td><td>e</td><td>f</td></tr>")
i=1
for l in Sbox:
l_str =""
for s in l:
l_str += "<td>"+hex(s)+"</td>"
reporter.add("<tr><td>K%d:</td> %s</tr>"%(i, l_str))
i += 1
reporter.add("</table>")
reporter.addBold("Список значений переданых для (рас)шифрования блока")
reporter.addList([hex(mess),hex(key), direction])
key = genKeys(key)
if not (direction == "enc"):
key.reverse()
if makeReport:
reporter.addBold("Сгенерированная последовательность ключей:")
reporter.addList([hex(x) for x in key])
N1 = cryptBlocks.getRight(mess, 4)
N2 = cryptBlocks.getLeft(mess, 4)
if makeReport:
reporter.addBold("N1=%s,<br>N2=%s"%(hex(N1), hex(N2)))
i = 1
# 32 times
for k in key:
if makeReport:
reporter.addBold("Сеть Фейстеля, итерация %d с N1=%s, N2=%s, key=%s"%(i, hex(N1), hex(N2), hex(k)))
i+=1
tmp = N1
N1 = N2^functionF(N1, k)
N2 = tmp
if makeReport:
reporter.addBold("Результат итерации: N1=%s, N2=%s<br>"%(hex(N1), hex(N2)))
mess = cryptBlocks.concat(N1, N2, 32)
if makeReport:
reporter.addBold("Шифрованное сообщение "+hex(mess))
return mess
def getHash(src):
"""
Main function - calculates hash of the given blocks.
"""
# wtf?! 256 bit, 32 byte! its amazin
blockLength = 32
mess = cryptBlocks.getBlocksFromString(src, blockLength)
checksumE = 0
# size of message modulo 2^256
lengthL = 0
stepH = 0
if makeReport:
i = 0
for m in mess:
if makeReport:
i += 1
reporter.addBold("Variables list for block N%d "%(i))
reporter.addList(["m = "+hex(m),"H = "+hex(stepH),"L = "+hex(lengthL),"E = "+hex(checksumE)])
stepH = stepFunction(stepH, m)
lengthL = (lengthL + cryptBlocks.getSizeOfBlock(m))%(2**(blockLength*8))
checksumE += (checksumE + m)%(2**(blockLength*8))
stepH = stepFunction(stepH, lengthL)
stepH = stepFunction(stepH, checksumE)
return stepH
