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main.py
from md5hash import md5 m = md5() m.update('foo') m.hexdigest() print(m.hexdigest())
md5.py
""" Copyright [2018] [Mauro Riva <lemariva@mail.com> <lemariva.com>] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. based on https://rosettacode.org/wiki/MD5/Implementation#Python adapted for MicroPython """ rotate_amounts = [7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21] #constants = [int(abs(math.sin(i+1)) * 2**32) & 0xFFFFFFFF for i in range(64)] # precision is not enough constants = [3614090360, 3905402710, 606105819, 3250441966, 4118548399, 1200080426, 2821735955, 4249261313, 1770035416, 2336552879, 4294925233, 2304563134, 1804603682, 4254626195, 2792965006, 1236535329, 4129170786, 3225465664, 643717713, 3921069994, 3593408605, 38016083, 3634488961, 3889429448, 568446438, 3275163606, 4107603335, 1163531501, 2850285829, 4243563512, 1735328473, 2368359562, 4294588738, 2272392833, 1839030562, 4259657740, 2763975236, 1272893353, 4139469664, 3200236656, 681279174, 3936430074, 3572445317, 76029189, 3654602809, 3873151461, 530742520, 3299628645, 4096336452, 1126891415, 2878612391, 4237533241, 1700485571, 2399980690, 4293915773, 2240044497, 1873313359, 4264355552, 2734768916, 1309151649, 4149444226, 3174756917, 718787259, 3951481745] init_values = [0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476] functions = 16*[lambda b, c, d: (b & c) | (~b & d)] + \ 16*[lambda b, c, d: (d & b) | (~d & c)] + \ 16*[lambda b, c, d: b ^ c ^ d] + \ 16*[lambda b, c, d: c ^ (b | ~d)] index_functions = 16*[lambda i: i] + \ 16*[lambda i: (5*i + 1)%16] + \ 16*[lambda i: (3*i + 5)%16] + \ 16*[lambda i: (7*i)%16] def left_rotate(x, amount): x &= 0xFFFFFFFF return ((x<<amount) | (x>>(32-amount))) & 0xFFFFFFFF def md5(message): message = bytearray(message) #copy our input into a mutable buffer orig_len_in_bits = (8 * len(message)) & 0xffffffffffffffff message.append(0x80) while len(message)%64 != 56: message.append(0) message += orig_len_in_bits.to_bytes(8, 'little') #print (message) hash_pieces = init_values[:] for chunk_ofst in range(0, len(message), 64): a, b, c, d = hash_pieces chunk = message[chunk_ofst:chunk_ofst+64] #print(a, b, c, d) for i in range(64): f = functions[i](b, c, d) g = index_functions[i](i) #print(constants[i]) to_rotate = a + f + constants[i] + int.from_bytes(chunk[4*g:4*g+4], 'little') new_b = (b + left_rotate(to_rotate, rotate_amounts[i])) & 0xFFFFFFFF a, b, c, d = d, new_b, b, c #print(to_rotate) for i, val in enumerate([a, b, c, d]): hash_pieces[i] += val hash_pieces[i] &= 0xFFFFFFFF return sum(x<<(32*i) for i, x in enumerate(hash_pieces)) def digest(message): digest = md5(message) raw = digest.to_bytes(16, 'little') return '{:032x}'.format(int.from_bytes(raw, 'big')) #return raw
md5hash.py
""" Copyright [2018] [Mauro Riva <lemariva@mail.com> <lemariva.com>] Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. Encode a string using an MD5 algorithm Usage: >>> from md5hash import md5 >>> m = md5() >>> m.update('foo') >>> m.hexdigest() 'acbd18db4cc2f85cedef654fccc4a4d8' Based on https://rosettacode.org/wiki/MD5/Implementation#Python Adapted for MicroPython """ rotate_amounts = [7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21] #constants = [int(abs(math.sin(i+1)) * 2**32) & 0xFFFFFFFF for i in range(64)] # precision is not enough constants = [3614090360, 3905402710, 606105819, 3250441966, 4118548399, 1200080426, 2821735955, 4249261313, 1770035416, 2336552879, 4294925233, 2304563134, 1804603682, 4254626195, 2792965006, 1236535329, 4129170786, 3225465664, 643717713, 3921069994, 3593408605, 38016083, 3634488961, 3889429448, 568446438, 3275163606, 4107603335, 1163531501, 2850285829, 4243563512, 1735328473, 2368359562, 4294588738, 2272392833, 1839030562, 4259657740, 2763975236, 1272893353, 4139469664, 3200236656, 681279174, 3936430074, 3572445317, 76029189, 3654602809, 3873151461, 530742520, 3299628645, 4096336452, 1126891415, 2878612391, 4237533241, 1700485571, 2399980690, 4293915773, 2240044497, 1873313359, 4264355552, 2734768916, 1309151649, 4149444226, 3174756917, 718787259, 3951481745] init_values = [0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476] functions = 16*[lambda b, c, d: (b & c) | (~b & d)] + \ 16*[lambda b, c, d: (d & b) | (~d & c)] + \ 16*[lambda b, c, d: b ^ c ^ d] + \ 16*[lambda b, c, d: c ^ (b | ~d)] index_functions = 16*[lambda i: i] + \ 16*[lambda i: (5*i + 1)%16] + \ 16*[lambda i: (3*i + 5)%16] + \ 16*[lambda i: (7*i)%16] class md5(): def __init__(self): return def left_rotate(self, x, amount): x &= 0xFFFFFFFF return ((x<<amount) | (x>>(32-amount))) & 0xFFFFFFFF def update(self, message): self.message = bytearray(message) #copy our input into a mutable buffer orig_len_in_bits = (8 * len(self.message)) & 0xffffffffffffffff self.message.append(0x80) while len(self.message)%64 != 56: self.message.append(0) self.message += orig_len_in_bits.to_bytes(8, 'little') hash_pieces = init_values[:] for chunk_ofst in range(0, len(self.message), 64): a, b, c, d = hash_pieces chunk = self.message[chunk_ofst:chunk_ofst+64] for i in range(64): f = functions[i](b, c, d) g = index_functions[i](i) to_rotate = a + f + constants[i] + int.from_bytes(chunk[4*g:4*g+4], 'little') new_b = (b + self.left_rotate(to_rotate, rotate_amounts[i])) & 0xFFFFFFFF a, b, c, d = d, new_b, b, c for i, val in enumerate([a, b, c, d]): hash_pieces[i] += val hash_pieces[i] &= 0xFFFFFFFF self.msg_digest = sum(x<<(32*i) for i, x in enumerate(hash_pieces)) def digest(self): return self.msg_digest def hexdigest(self): raw = self.msg_digest.to_bytes(16, 'little') return '{:032x}'.format(int.from_bytes(raw, 'big'))
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执行时间: 0.0099349021911621 seconds