CompactFIPS202.sage

# -*- coding: utf-8 -*-
# Implementation by Gilles Van Assche, hereby denoted as "the implementer".
#
# For more information, feedback or questions, please refer to our website:
# https://keccak.team/
#
# To the extent possible under law, the implementer has waived all copyright
# and related or neighboring rights to the source code in this file.
# http://creativecommons.org/publicdomain/zero/1.0/

def ROL64(a, n):
    return ((a >> (64-(n%64))) + (a << (n%64))) % (1 << 64)

def KeccakF1600onLanes(lanes):
    R = 1
    for round in range(24):
        # θ
        C = [lanes[x][0] ^^ lanes[x][1] ^^ lanes[x][2] ^^ lanes[x][3] ^^ lanes[x][4] for x in range(5)]
        D = [C[(x+4)%5] ^^ ROL64(C[(x+1)%5], 1) for x in range(5)]
        lanes = [[lanes[x][y]^^D[x] for y in range(5)] for x in range(5)]
        # ρ and π
        (x, y) = (1, 0)
        current = lanes[x][y]
        for t in range(24):
            (x, y) = (y, (2*x+3*y)%5)
            (current, lanes[x][y]) = (lanes[x][y], ROL64(current, floor((t+1)*(t+2)//2)))
        # χ
        for y in range(5):
            T = [lanes[x][y] for x in range(5)]
            for x in range(5):
                lanes[x][y] = T[x] ^^ ((-T[(x+1)%5]-1) & (T[(x+2)%5]))
        # ι
        for j in range(7):
            R = ((R << 1) ^^ ((R >> 7)*0x71)) % 256
            if (R & 2):
                lanes[0][0] = lanes[0][0] ^^ (1 << ((1<<j)-1))
    return lanes

def load64(b):
    return sum((b[i] << (8*i)) for i in range(8))

def store64(a):
    return list((a >> (8*i)) % 256 for i in range(8))

def KeccakF1600(state):
    lanes = [[load64(state[8*(x+5*y):8*(x+5*y)+8]) for y in range(5)] for x in range(5)]
    lanes = KeccakF1600onLanes(lanes)
    state = bytearray(200)
    for x in range(5):
        for y in range(5):
            state[8*(x+5*y):8*(x+5*y)+8] = store64(lanes[x][y])
    return state

def Keccak(rate, capacity, inputBytes, delimitedSuffix, outputByteLen):
    outputBytes = bytearray()
    state = bytearray([0 for i in range(200)])
    rateInBytes = floor(rate//8)
    blockSize = 0
    if (((rate + capacity) != 1600) or ((rate % 8) != 0)):
        return
    inputOffset = 0
    # === Absorb all the input blocks ===
    while(inputOffset < len(inputBytes)):
        blockSize = min(len(inputBytes)-inputOffset, rateInBytes)
        for i in range(blockSize):
            state[i] = state[i] ^^ inputBytes[i+inputOffset]
        inputOffset = inputOffset + blockSize
        if (blockSize == rateInBytes):
            state = KeccakF1600(state)
            blockSize = 0
    # === Do the padding and switch to the squeezing phase ===
    state[blockSize] = state[blockSize] ^^ delimitedSuffix
    if (((delimitedSuffix & 0x80) != 0) and (blockSize == (rateInBytes-1))):
        state = KeccakF1600(state)
    state[rateInBytes-1] = state[rateInBytes-1] ^^ 0x80
    state = KeccakF1600(state)
    # === Squeeze out all the output blocks ===
    while(outputByteLen > 0):
        blockSize = min(outputByteLen, rateInBytes)
        outputBytes = outputBytes + state[0:blockSize]
        outputByteLen = outputByteLen - blockSize
        if (outputByteLen > 0):
            state = KeccakF1600(state)
    return outputBytes

def SHAKE128(inputBytes, outputByteLen):
    return Keccak(1344, 256, inputBytes, 0x1F, outputByteLen)

def SHAKE256(inputBytes, outputByteLen):
    return Keccak(1088, 512, inputBytes, 0x1F, outputByteLen)

def SHA3_224(inputBytes):
    return Keccak(1152, 448, inputBytes, 0x06, 224//8)

def SHA3_256(inputBytes):
    return Keccak(1088, 512, inputBytes, 0x06, 256//8)

def SHA3_384(inputBytes):
    return Keccak(832, 768, inputBytes, 0x06, 384//8)

def SHA3_512(inputBytes):
    return Keccak(576, 1024, inputBytes, 0x06, 512//8)