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Diffstat (limited to '')
| -rw-r--r-- | sha3sum.py | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/sha3sum.py b/sha3sum.py new file mode 100644 index 0000000..e4be16a --- /dev/null +++ b/sha3sum.py @@ -0,0 +1,266 @@ +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 + |