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import sys
class SHA3:
RC=[0x0000000000000001, 0x0000000000008082, 0x800000000000808A, 0x8000000080008000,
0x000000000000808B, 0x0000000080000001, 0x8000000080008081, 0x8000000000008009,
0x000000000000008A, 0x0000000000000088, 0x0000000080008009, 0x000000008000000A,
0x000000008000808B, 0x800000000000008B, 0x8000000000008089, 0x8000000000008003,
0x8000000000008002, 0x8000000000000080, 0x000000000000800A, 0x800000008000000A,
0x8000000080008081, 0x8000000000008080, 0x0000000080000001, 0x8000000080008008]
'''
:list<int> Round contants
'''
R=[0, 36, 3, 41, 18,
1, 44, 10, 45, 2,
62, 6, 43, 15, 61,
28, 55, 25, 21, 56,
27, 20, 39, 8, 14]
'''
:list<int> Rotate constants
'''
B = [[0,0,0,0,0],[0,0,0,0,0],[0,0,0,0,0],[0,0,0,0,0],[0,0,0,0,0]]
'''
:list<list<int>> Keccak-f round temporary
'''
C = [0,0,0,0,0]
'''
:list<int> Keccak-f round temporary
'''
D = [0,0,0,0,0]
'''
:list<int> Keccak-f round temporary
'''
b = 0
'''
:int The bitrate
'''
w = 0
'''
:int The word size
'''
wmod = 0
'''
:int The word mask
'''
l = 0
'''
:int ℓ, the binary logarithm of the word size
'''
nr = 0
'''
:int 12 + 2ℓ, the number of rounds
'''
@staticmethod
def rotate(x, n):
'''
Rotate a word
@param x:int The value to rotate
@param n:int Rotation steps
@return :int The value rotated
'''
return ((x >> (Keccak.w - (n % Keccak.w))) + (x << (n % Keccak.w))) & Keccak.wmod
@staticmethod
def lb(x):
'''
Binary logarithm
@param x:int The value of which to calculate the binary logarithm
@return :int The binary logarithm
'''
rc_a = 0 if (x & 0xFF00) == 0 else 8
rc_b = 0 if (x & 0xF0F0) == 0 else 4
rc_c = 0 if (x & 0xCCCC) == 0 else 2
rc_d = 0 if (x & 0xAAAA) == 0 else 1
return rc_a + rc_b + rc_c + rc_d
@staticmethod
def keccakFRound(A, rc):
'''
Perform one round of computation
@param A:list<list<int>> The current state
@param rc:int Round constant
'''
# θ step
for x in range(5):
Keccak.C[x] = A[x][0] ^ A[x][1] ^ A[x][2] ^ A[x][3] ^ A[x][4]
for x in range(5):
Keccak.D[x] = Keccak.C[(x - 1) % 5] ^ Keccak.rotate(Keccak.C[(x + 1) % 5], 1)
for x in range(5):
for y in range(5):
A[x][y] ^= Keccak.D[x]
# ρ and π steps
for x in range(5):
for y in range(5):
Keccak.B[y][(2 * x + 3 * y) % 5] = Keccak.rotate(A[x][y], Keccak.R[x * 5 + y])
# ξ step
for x in range(5):
for y in range(5):
A[x][y] = Keccak.B[x][y] ^ ((~(Keccak.B[(x + 1) % 5][y])) & Keccak.B[(x + 2) % 5][y])
# ι step
A[0][0] ^= rc
@staticmethod
def keccakF(A):
'''
Perform Keccak-f function
@param A:list<list<int>> The current state
'''
for i in range(Keccak.nr):
Keccak.keccakFRound(A, Keccak.RC[i] & Keccak.wmod)
@staticmethod
def toLane(message, rr, ww, off):
'''
Convert a chunk of char:s to a word
@param message:str The message
@param rr:int Bitrate in bytes
@param ww:int Word size in bytes
@param off:int The offset in the message
@return :int Lane
'''
rc = 0
i = off + ww - 1
while i >= off:
rc <<= 8
rc |= ord(message[i]) if (i < rr) else 0
i -= 1
return rc
@staticmethod
def pad10star1(M, r):
'''
pad 10*1
@param M:str The message to pad
@param r:int The bitrate
@return :str The message padded
'''
[nnn, msg] = M
nrf = nnn >> 3
nbrf = nnn & 7
ll = nnn % r
bbbb = 1 if nbrf == 0 else ((ord(msg[nrf]) >> (8 - nbrf)) | (1 << nbrf))
message = None
if ((r - 8 <= ll) and (ll <= r - 2)):
nnn = nrf + 1
message = [''] * 1
message[0] = chr(bbbb ^ 128)
else:
nnn = (nrf + 1) << 3
nnn = ((nnn - (nnn % r) + (r - 8)) >> 3) + 1
message = [''] * (nnn - nrf)
message[0] = chr(bbbb)
i = nrf + 1
while i < nnn:
message[i - nrf] += '\0'
i += 1
message[nnn - nrf - 1] = chr(0x80)
return msg[:nrf] + ''.join(message)
@staticmethod
def keccak(M, r = 1024, c = 576, n = 1024):
Keccak.b = (r + c)
Keccak.w = Keccak.b // 25
Keccak.l = Keccak.lb(Keccak.w)
Keccak.nr = 12 + (Keccak.l << 1)
Keccak.wmod = (1 << Keccak.w) - 1
S=[[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0]]
message = Keccak.pad10star1(M, r)
nnn = len(message)
rr = r >> 3
cc = c >> 3
nn = n >> 3
ww = Keccak.w >> 3
#Absorbing phase
msg_i =[[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0]]
m = nnn
i = 0
while i < m:
for y in range(5):
for x in range(5):
off = (5 * y + x) * ww
msg_i[x][y] = Keccak.toLane(message[i:], rr, ww, off)
for y in range(5):
for x in range(5):
S[x][y] ^= msg_i[x][y]
Keccak.keccakF(S)
i += rr
#Squeezing phase
olen = n
j = 0
while (olen > 0):
i = 0
while (i < 25) and (i < rr) and (j < nn):
v = S[i % 5][i // 5]
for _ in range(8):
if (j < nn):
sys.stdout.buffer.write(bytes([v & 255]))
v >>= 8
j += 1
i += 1
olen -= r
if olen > 0:
Keccak.keccakF(S)
output = 512
total = 1600
bitrate = total - output * 2
MESSAGE = "The quick brown fox jumps over the lazy dog."
SHA3.keccak([len(MESSAGE)*0, MESSAGE], bitrate, total - bitrate, output)
sys.stdout.buffer.flush()
# 0e ab 42 de 4c 3c eb 92 35 fc 91 ac ff e7 46 b2
# 9c 29 a8 c3 66 b7 c6 0e 4e 67 c4 66 f3 6a 43 04
# c0 0f a9 ca f9 d8 79 76 ba 46 9b cb e0 67 13 b4
# 35 f0 91 ef 27 69 fb 16 0c da b3 3d 36 70 68 0e
|
