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Diffstat (limited to '')
| -rw-r--r-- | python3/sha3.py | 661 |
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diff --git a/python3/sha3.py b/python3/sha3.py deleted file mode 100644 index 639be46..0000000 --- a/python3/sha3.py +++ /dev/null @@ -1,661 +0,0 @@ -#!/usr/bin/env python3 -# -*- coding: utf-8 -*- -''' -sha3sum – SHA-3 (Keccak) checksum calculator - -Copyright © 2013, 2014 Mattias Andrée (maandree@member.fsf.org) - -This program is free software: you can redistribute it and/or modify -it under the terms of the GNU Affero General Public License as published by -the Free Software Foundation, either version 3 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU Affero General Public License for more details. - -You should have received a copy of the GNU Affero General Public License -along with this program. If not, see <http://www.gnu.org/licenses/>. -''' - -class SHA3: - ''' - SHA-3/Keccak hash algorithm implementation - - @author Mattias Andrée (maandree@member.fsf.org) - ''' - - - KECCAK_SUFFIX = '' - ''' - :str Suffix the message when calculating the Keccak hash sum - ''' - - SHA3_SUFFIX = '01' - ''' - :str Suffix the message when calculating the SHA-3 hash sum - ''' - - RawSHAKE_SUFFIX = '11' - ''' - :str Suffix the message when calculating the RawSHAKE hash sum - ''' - - SHAKE_SUFFIX = '1111' - ''' - :str Suffix the message when calculating the SHAKE hash sum - ''' - - - def __init__(self): - ''' - Constructor - ''' - - self.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 - ''' - - self.B = [0] * 25 - ''' - :list<int> Keccak-f round temporary - ''' - - self.C = [0] * 5 - ''' - :list<int> Keccak-f round temporary - ''' - - - (self.r, self.c, self.n, self.b, self.w, self.wmod, self.l, self.nr) = (0, 0, 0, 0, 0, 0, 0, 0) - ''' - r:int The bitrate - c:int The capacity - n:int The output size - b:int The state size - w:int The word size - wmod:int The word mask - l:int ℓ, the binary logarithm of the word size - nr:int 12 + 2ℓ, the number of rounds - ''' - - self.S = None - ''' - :list<int> The current state - ''' - - self.M = None - ''' - :bytes Left over water to fill the sponge with at next update - ''' - - - - def rotate(self, x, n): - ''' - Rotate a word - - @param x:int The value to rotate - @param n:int Rotation steps - @return :int The value rotated - ''' - m = n % self.w - return ((x >> (self.w - m)) + (x << m)) & self.wmod - - - def rotate64(self, x, n): - ''' - Rotate a 64-bit word - - @param x:int The value to rotate - @param n:int Rotation steps - @return :int The value rotated - ''' - return ((x >> (64 - n)) + (x << n)) & 0xFFFFFFFFFFFFFFFF - - - def lb(self, x): - ''' - Binary logarithm - - @param x:int The value of which to calculate the binary logarithm - @return :int The binary logarithm - ''' - rc = 0 - if (x & 0xFF00) != 0: rc += 8 ; x >>= 8 - if (x & 0x00F0) != 0: rc += 4 ; x >>= 4 - if (x & 0x000C) != 0: rc += 2 ; x >>= 2 - if (x & 0x0002) != 0: rc += 1 - return rc - - - def keccakFRound(self, A, rc): - ''' - Perform one round of computation - - @param A:list<int> The current state - @param rc:int Round constant - ''' - if self.w == 64: - # θ step (step 1 and 2 of 3) - self.C[0] = (A[0] ^ A[1]) ^ (A[2] ^ A[3]) ^ A[4] - self.C[2] = (A[10] ^ A[11]) ^ (A[12] ^ A[13]) ^ A[14] - db = self.C[0] ^ self.rotate64(self.C[2], 1) - self.C[4] = (A[20] ^ A[21]) ^ (A[22] ^ A[23]) ^ A[24] - dd = self.C[2] ^ self.rotate64(self.C[4], 1) - self.C[1] = (A[5] ^ A[6]) ^ (A[7] ^ A[8]) ^ A[9] - da = self.C[4] ^ self.rotate64(self.C[1], 1) - self.C[3] = (A[15] ^ A[16]) ^ (A[17] ^ A[18]) ^ A[19] - dc = self.C[1] ^ self.rotate64(self.C[3], 1) - de = self.C[3] ^ self.rotate64(self.C[0], 1) - - # ρ and π steps, with last part of θ - self.B[0] = self.rotate64(A[0] ^ da, 0) - self.B[1] = self.rotate64(A[15] ^ dd, 28) - self.B[2] = self.rotate64(A[5] ^ db, 1) - self.B[3] = self.rotate64(A[20] ^ de, 27) - self.B[4] = self.rotate64(A[10] ^ dc, 62) - - self.B[5] = self.rotate64(A[6] ^ db, 44) - self.B[6] = self.rotate64(A[21] ^ de, 20) - self.B[7] = self.rotate64(A[11] ^ dc, 6) - self.B[8] = self.rotate64(A[1] ^ da, 36) - self.B[9] = self.rotate64(A[16] ^ dd, 55) - - self.B[10] = self.rotate64(A[12] ^ dc, 43) - self.B[11] = self.rotate64(A[2] ^ da, 3) - self.B[12] = self.rotate64(A[17] ^ dd, 25) - self.B[13] = self.rotate64(A[7] ^ db, 10) - self.B[14] = self.rotate64(A[22] ^ de, 39) - - self.B[15] = self.rotate64(A[18] ^ dd, 21) - self.B[16] = self.rotate64(A[8] ^ db, 45) - self.B[17] = self.rotate64(A[23] ^ de, 8) - self.B[18] = self.rotate64(A[13] ^ dc, 15) - self.B[19] = self.rotate64(A[3] ^ da, 41) - - self.B[20] = self.rotate64(A[24] ^ de, 14) - self.B[21] = self.rotate64(A[14] ^ dc, 61) - self.B[22] = self.rotate64(A[4] ^ da, 18) - self.B[23] = self.rotate64(A[19] ^ dd, 56) - self.B[24] = self.rotate64(A[9] ^ db, 2) - else: - # θ step (step 1 and 2 of 3) - self.C[0] = (A[0] ^ A[1]) ^ (A[2] ^ A[3]) ^ A[4] - self.C[2] = (A[10] ^ A[11]) ^ (A[12] ^ A[13]) ^ A[14] - db = self.C[0] ^ self.rotate(self.C[2], 1) - self.C[4] = (A[20] ^ A[21]) ^ (A[22] ^ A[23]) ^ A[24] - dd = self.C[2] ^ self.rotate(self.C[4], 1) - self.C[1] = (A[5] ^ A[6]) ^ (A[7] ^ A[8]) ^ A[9] - da = self.C[4] ^ self.rotate(self.C[1], 1) - self.C[3] = (A[15] ^ A[16]) ^ (A[17] ^ A[18]) ^ A[19] - dc = self.C[1] ^ self.rotate(self.C[3], 1) - de = self.C[3] ^ self.rotate(self.C[0], 1) - - # ρ and π steps, with last part of θ - self.B[0] = self.rotate(A[0] ^ da, 0) - self.B[1] = self.rotate(A[15] ^ dd, 28) - self.B[2] = self.rotate(A[5] ^ db, 1) - self.B[3] = self.rotate(A[20] ^ de, 27) - self.B[4] = self.rotate(A[10] ^ dc, 62) - - self.B[5] = self.rotate(A[6] ^ db, 44) - self.B[6] = self.rotate(A[21] ^ de, 20) - self.B[7] = self.rotate(A[11] ^ dc, 6) - self.B[8] = self.rotate(A[1] ^ da, 36) - self.B[9] = self.rotate(A[16] ^ dd, 55) - - self.B[10] = self.rotate(A[12] ^ dc, 43) - self.B[11] = self.rotate(A[2] ^ da, 3) - self.B[12] = self.rotate(A[17] ^ dd, 25) - self.B[13] = self.rotate(A[7] ^ db, 10) - self.B[14] = self.rotate(A[22] ^ de, 39) - - self.B[15] = self.rotate(A[18] ^ dd, 21) - self.B[16] = self.rotate(A[8] ^ db, 45) - self.B[17] = self.rotate(A[23] ^ de, 8) - self.B[18] = self.rotate(A[13] ^ dc, 15) - self.B[19] = self.rotate(A[3] ^ da, 41) - - self.B[20] = self.rotate(A[24] ^ de, 14) - self.B[21] = self.rotate(A[14] ^ dc, 61) - self.B[22] = self.rotate(A[4] ^ da, 18) - self.B[23] = self.rotate(A[19] ^ dd, 56) - self.B[24] = self.rotate(A[9] ^ db, 2) - - # ξ step - A[0] = self.B[0] ^ ((~(self.B[5])) & self.B[10]) - A[1] = self.B[1] ^ ((~(self.B[6])) & self.B[11]) - A[2] = self.B[2] ^ ((~(self.B[7])) & self.B[12]) - A[3] = self.B[3] ^ ((~(self.B[8])) & self.B[13]) - A[4] = self.B[4] ^ ((~(self.B[9])) & self.B[14]) - - A[5] = self.B[5] ^ ((~(self.B[10])) & self.B[15]) - A[6] = self.B[6] ^ ((~(self.B[11])) & self.B[16]) - A[7] = self.B[7] ^ ((~(self.B[12])) & self.B[17]) - A[8] = self.B[8] ^ ((~(self.B[13])) & self.B[18]) - A[9] = self.B[9] ^ ((~(self.B[14])) & self.B[19]) - - A[10] = self.B[10] ^ ((~(self.B[15])) & self.B[20]) - A[11] = self.B[11] ^ ((~(self.B[16])) & self.B[21]) - A[12] = self.B[12] ^ ((~(self.B[17])) & self.B[22]) - A[13] = self.B[13] ^ ((~(self.B[18])) & self.B[23]) - A[14] = self.B[14] ^ ((~(self.B[19])) & self.B[24]) - - A[15] = self.B[15] ^ ((~(self.B[20])) & self.B[0]) - A[16] = self.B[16] ^ ((~(self.B[21])) & self.B[1]) - A[17] = self.B[17] ^ ((~(self.B[22])) & self.B[2]) - A[18] = self.B[18] ^ ((~(self.B[23])) & self.B[3]) - A[19] = self.B[19] ^ ((~(self.B[24])) & self.B[4]) - - A[20] = self.B[20] ^ ((~(self.B[0])) & self.B[5]) - A[21] = self.B[21] ^ ((~(self.B[1])) & self.B[6]) - A[22] = self.B[22] ^ ((~(self.B[2])) & self.B[7]) - A[23] = self.B[23] ^ ((~(self.B[3])) & self.B[8]) - A[24] = self.B[24] ^ ((~(self.B[4])) & self.B[9]) - - # ι step - A[0] ^= rc - - - def keccakF(self, A): - ''' - Perform Keccak-f function - - @param A:list<int> The current state - ''' - if (self.nr == 24): - self.keccakFRound(A, 0x0000000000000001) - self.keccakFRound(A, 0x0000000000008082) - self.keccakFRound(A, 0x800000000000808A) - self.keccakFRound(A, 0x8000000080008000) - self.keccakFRound(A, 0x000000000000808B) - self.keccakFRound(A, 0x0000000080000001) - self.keccakFRound(A, 0x8000000080008081) - self.keccakFRound(A, 0x8000000000008009) - self.keccakFRound(A, 0x000000000000008A) - self.keccakFRound(A, 0x0000000000000088) - self.keccakFRound(A, 0x0000000080008009) - self.keccakFRound(A, 0x000000008000000A) - self.keccakFRound(A, 0x000000008000808B) - self.keccakFRound(A, 0x800000000000008B) - self.keccakFRound(A, 0x8000000000008089) - self.keccakFRound(A, 0x8000000000008003) - self.keccakFRound(A, 0x8000000000008002) - self.keccakFRound(A, 0x8000000000000080) - self.keccakFRound(A, 0x000000000000800A) - self.keccakFRound(A, 0x800000008000000A) - self.keccakFRound(A, 0x8000000080008081) - self.keccakFRound(A, 0x8000000000008080) - self.keccakFRound(A, 0x0000000080000001) - self.keccakFRound(A, 0x8000000080008008) - else: - for i in range(self.nr): - self.keccakFRound(A, self.RC[i] & self.wmod) - - - def toLane(self, message, n, ww, off): - ''' - Convert a chunk of byte:s to a word - - @param message:bytes The message - @param n:int `min(len(message), rr)` - 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 = (rc << 8) | (message[i] if (i < n) else 0) - i -= 1 - return rc - - - def toLane64(self, message, n, off): - ''' - Convert a chunk of byte:s to a 64-bit word - - @param message:bytes The message - @param n:int `min(len(message), rr)` - rr:int Bitrate in bytes - @param off:int The offset in the message - @return :int Lane - ''' - return ((message[off + 7] << 56) if (off + 7 < n) else 0) | ((message[off + 6] << 48) if (off + 6 < n) else 0) | ((message[off + 5] << 40) if (off + 5 < n) else 0) | ((message[off + 4] << 32) if (off + 4 < n) else 0) | ((message[off + 3] << 24) if (off + 3 < n) else 0) | ((message[off + 2] << 16) if (off + 2 < n) else 0) | ((message[off + 1] << 8) if (off + 1 < n) else 0) | ((message[off]) if (off < n) else 0) - - - def pad10star1(self, msg, r, bits): - ''' - pad 10*1 - - @param msg:bytes The message to pad - @param r:int The bitrate - @param bits:int The number of bits in the end of the message that does not make a whole byte - @return :bytes The message padded - ''' - nnn = ((len(msg) - (bits + 7) // 8) << 3) + bits - - nrf = nnn >> 3 - nbrf = nnn & 7 - ll = nnn % r - - bbbb = 1 if nbrf == 0 else (msg[nrf] | (1 << nbrf)) - - message = None - if ((r - 8 <= ll) and (ll <= r - 2)): - message = [bbbb ^ 128] - else: - nnn = (nrf + 1) << 3 - nnn = ((nnn - (nnn % r) + (r - 8)) >> 3) + 1 - message = [0] * (nnn - nrf) - message[0] = bbbb - nnn -= nrf - message[nnn - 1] = 0x80 - - return msg[:nrf] + bytes(message) - - - def initialise(self, r, c, n): - ''' - Initialise Keccak sponge - - @param r:int The bitrate - @param c:int The capacity - @param n:int The output size - ''' - self.r = r - self.c = c - self.n = n - self.b = r + c - self.w = self.b // 25 - self.l = self.lb(self.w) - self.nr = 12 + (self.l << 1) - self.wmod = (1 << self.w) - 1 - self.S = [0] * 25 - self.M = bytes([]) - - - def update(self, msg, msglen = None): - ''' - Absorb the more of the message message to the Keccak sponge - - @param msg:bytes The partial message - @param msglen:int The length of the partial message in whole bytes - ''' - if msglen is not None: - msg = msg[:msglen] - - rr = self.r >> 3 - ww = self.w >> 3 - - self.M += msg - nnn = len(self.M) - nnn -= nnn % ((self.r * self.b) >> 3) - message = self.M[:nnn] - self.M = self.M[nnn:] - - # Absorbing phase - if ww == 8: - for i in range(0, nnn, rr): - n = min(len(message), rr) - self.S[ 0] ^= self.toLane64(message, n, 0) - self.S[ 5] ^= self.toLane64(message, n, 8) - self.S[10] ^= self.toLane64(message, n, 16) - self.S[15] ^= self.toLane64(message, n, 24) - self.S[20] ^= self.toLane64(message, n, 32) - self.S[ 1] ^= self.toLane64(message, n, 40) - self.S[ 6] ^= self.toLane64(message, n, 48) - self.S[11] ^= self.toLane64(message, n, 56) - self.S[16] ^= self.toLane64(message, n, 64) - self.S[21] ^= self.toLane64(message, n, 72) - self.S[ 2] ^= self.toLane64(message, n, 80) - self.S[ 7] ^= self.toLane64(message, n, 88) - self.S[12] ^= self.toLane64(message, n, 96) - self.S[17] ^= self.toLane64(message, n, 104) - self.S[22] ^= self.toLane64(message, n, 112) - self.S[ 3] ^= self.toLane64(message, n, 120) - self.S[ 8] ^= self.toLane64(message, n, 128) - self.S[13] ^= self.toLane64(message, n, 136) - self.S[18] ^= self.toLane64(message, n, 144) - self.S[23] ^= self.toLane64(message, n, 152) - self.S[ 4] ^= self.toLane64(message, n, 160) - self.S[ 9] ^= self.toLane64(message, n, 168) - self.S[14] ^= self.toLane64(message, n, 176) - self.S[19] ^= self.toLane64(message, n, 184) - self.S[24] ^= self.toLane64(message, n, 192) - self.keccakF(self.S) - message = message[rr:] - else: - for i in range(0, nnn, rr): - n = min(len(message), rr) - self.S[ 0] ^= self.toLane(message, n, ww, 0) - self.S[ 5] ^= self.toLane(message, n, ww, ww) - self.S[10] ^= self.toLane(message, n, ww, 2 * ww) - self.S[15] ^= self.toLane(message, n, ww, 3 * ww) - self.S[20] ^= self.toLane(message, n, ww, 4 * ww) - self.S[ 1] ^= self.toLane(message, n, ww, 5 * ww) - self.S[ 6] ^= self.toLane(message, n, ww, 6 * ww) - self.S[11] ^= self.toLane(message, n, ww, 7 * ww) - self.S[16] ^= self.toLane(message, n, ww, 8 * ww) - self.S[21] ^= self.toLane(message, n, ww, 9 * ww) - self.S[ 2] ^= self.toLane(message, n, ww, 10 * ww) - self.S[ 7] ^= self.toLane(message, n, ww, 11 * ww) - self.S[12] ^= self.toLane(message, n, ww, 12 * ww) - self.S[17] ^= self.toLane(message, n, ww, 13 * ww) - self.S[22] ^= self.toLane(message, n, ww, 14 * ww) - self.S[ 3] ^= self.toLane(message, n, ww, 15 * ww) - self.S[ 8] ^= self.toLane(message, n, ww, 16 * ww) - self.S[13] ^= self.toLane(message, n, ww, 17 * ww) - self.S[18] ^= self.toLane(message, n, ww, 18 * ww) - self.S[23] ^= self.toLane(message, n, ww, 19 * ww) - self.S[ 4] ^= self.toLane(message, n, ww, 20 * ww) - self.S[ 9] ^= self.toLane(message, n, ww, 21 * ww) - self.S[14] ^= self.toLane(message, n, ww, 22 * ww) - self.S[19] ^= self.toLane(message, n, ww, 23 * ww) - self.S[24] ^= self.toLane(message, n, ww, 24 * ww) - self.keccakF(self.S) - message = message[rr:] - - - def digest(self, msg = None, msglen = None, bits = 0, suffix = SHA3_SUFFIX, withReturn = False): - ''' - Absorb the last part of the message and squeeze the Keccak sponge - - @param msg:bytes? The rest of the message - @param msglen:int The length of the partial message in whole bytes - @param bits:int The number of bits at the end of the message not covered by `msglen` - @param suffix:str The suffix concatenate to the message - @param withReturn:bool Whether to return the hash instead of just do a quick squeeze phrase and return `None` - @return :bytes? The hash sum, or `None` if `withReturn` is `False` - ''' - if msg is None: - msg, last_byte = bytes([]), 0 - bits = 0 - else: - msg, last_byte = msg[:msglen + bits // 8], (0 if bits % 8 == 0 else msg[msglen]) - bits %= 8 - last_byte &= (1 << bits) - 1 - msg_end = [] - for bit in suffix: - last_byte |= int(bit) << bits - bits += 1 - if bits == 8: - msg_end.append(last_byte) - last_byte = 0 - bits = 0 - if not bits == 0: - msg_end.append(last_byte) - msg += bytes(msg_end) - message = self.pad10star1(self.M + msg, self.r, bits) - self.M = None - nnn = len(message) - - rr = self.r >> 3 - nn = (self.n + 7) >> 3 - ww = self.w >> 3 - - # Absorbing phase - if ww == 8: - for i in range(0, nnn, rr): - n = min(len(message), rr) - self.S[ 0] ^= self.toLane64(message, n, 0) - self.S[ 5] ^= self.toLane64(message, n, 8) - self.S[10] ^= self.toLane64(message, n, 16) - self.S[15] ^= self.toLane64(message, n, 24) - self.S[20] ^= self.toLane64(message, n, 32) - self.S[ 1] ^= self.toLane64(message, n, 40) - self.S[ 6] ^= self.toLane64(message, n, 48) - self.S[11] ^= self.toLane64(message, n, 56) - self.S[16] ^= self.toLane64(message, n, 64) - self.S[21] ^= self.toLane64(message, n, 72) - self.S[ 2] ^= self.toLane64(message, n, 80) - self.S[ 7] ^= self.toLane64(message, n, 88) - self.S[12] ^= self.toLane64(message, n, 96) - self.S[17] ^= self.toLane64(message, n, 104) - self.S[22] ^= self.toLane64(message, n, 112) - self.S[ 3] ^= self.toLane64(message, n, 120) - self.S[ 8] ^= self.toLane64(message, n, 128) - self.S[13] ^= self.toLane64(message, n, 136) - self.S[18] ^= self.toLane64(message, n, 144) - self.S[23] ^= self.toLane64(message, n, 152) - self.S[ 4] ^= self.toLane64(message, n, 160) - self.S[ 9] ^= self.toLane64(message, n, 168) - self.S[14] ^= self.toLane64(message, n, 176) - self.S[19] ^= self.toLane64(message, n, 184) - self.S[24] ^= self.toLane64(message, n, 192) - self.keccakF(self.S) - message = message[rr:] - else: - for i in range(0, nnn, rr): - n = min(len(message), rr) - self.S[ 0] ^= self.toLane(message, n, ww, 0) - self.S[ 5] ^= self.toLane(message, n, ww, ww) - self.S[10] ^= self.toLane(message, n, ww, 2 * ww) - self.S[15] ^= self.toLane(message, n, ww, 3 * ww) - self.S[20] ^= self.toLane(message, n, ww, 4 * ww) - self.S[ 1] ^= self.toLane(message, n, ww, 5 * ww) - self.S[ 6] ^= self.toLane(message, n, ww, 6 * ww) - self.S[11] ^= self.toLane(message, n, ww, 7 * ww) - self.S[16] ^= self.toLane(message, n, ww, 8 * ww) - self.S[21] ^= self.toLane(message, n, ww, 9 * ww) - self.S[ 2] ^= self.toLane(message, n, ww, 10 * ww) - self.S[ 7] ^= self.toLane(message, n, ww, 11 * ww) - self.S[12] ^= self.toLane(message, n, ww, 12 * ww) - self.S[17] ^= self.toLane(message, n, ww, 13 * ww) - self.S[22] ^= self.toLane(message, n, ww, 14 * ww) - self.S[ 3] ^= self.toLane(message, n, ww, 15 * ww) - self.S[ 8] ^= self.toLane(message, n, ww, 16 * ww) - self.S[13] ^= self.toLane(message, n, ww, 17 * ww) - self.S[18] ^= self.toLane(message, n, ww, 18 * ww) - self.S[23] ^= self.toLane(message, n, ww, 19 * ww) - self.S[ 4] ^= self.toLane(message, n, ww, 20 * ww) - self.S[ 9] ^= self.toLane(message, n, ww, 21 * ww) - self.S[14] ^= self.toLane(message, n, ww, 22 * ww) - self.S[19] ^= self.toLane(message, n, ww, 23 * ww) - self.S[24] ^= self.toLane(message, n, ww, 24 * ww) - self.keccakF(self.S) - message = message[rr:] - - # Squeezing phase - if withReturn: - rc = [0] * ((self.n + 7) >> 3) - ptr = 0 - - olen = self.n - j = 0 - ni = rr // ww - while olen > 0: - i = 0 - while (i < ni) and (j < nn): - v = self.S[(i % 5) * 5 + i // 5] - for _ in range(ww): - if j < nn: - rc[ptr] = v & 255 - ptr += 1 - v >>= 8 - j += 1 - i += 1 - olen -= self.r - if olen > 0: - self.keccakF(self.S) - if (self.n & 7) != 0: - rc[len(rc) - 1] &= (1 << (self.n & 7)) - 1 - - return bytes(rc) - - olen = self.n - while olen > self.r: - olen -= self.r - self.keccakF(self.S) - return None - - - def simpleSqueeze(self, times = 1): - ''' - Force some rounds of Keccak-f - - @param times:int The number of rounds - ''' - for i in range(times): - self.keccakF(self.S) - - - def fastSqueeze(self, times = 1): - ''' - Squeeze as much as is needed to get a digest a number of times - - @param times:int The number of digests - ''' - for i in range(times): - self.keccakF(self.S) # Last squeeze did not do a ending squeeze - olen = self.n - while olen > self.r: - olen -= self.r - self.keccakF(self.S) - - - def squeeze(self): - ''' - Squeeze out another digest - - @return :bytes The hash sum - ''' - self.keccakF(self.S) # Last squeeze did not do a ending squeeze - - nn = (self.n + 7) >> 3 - ww = self.w >> 3 - rc = [0] * nn - olen = self.n - j = 0 - ptr = 0 - ni = (self.r >> 3) // ww - - while olen > 0: - i = 0 - while (i < ni) and (j < nn): - v = self.S[(i % 5) * 5 + i // 5] - for _ in range(ww): - if j < nn: - rc[ptr] = v - ptr += 1 - v >>= 8 - j += 1 - i += 1 - olen -= self.r - if olen > 0: - self.keccakF(self.S) - - if (self.n & 7) != 0: - rc[len(rc) - 1] &= (1 << (self.n & 7)) - 1 - - return bytes(rc) - |