关于micropython无法计算MD5的问题 AttributeError: ‘module‘ object has no attribute ‘md5‘

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#哈希算法 #算法

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文章详细描述了在MicroPython环境下遇到的MD5模块缺失问题，提供了一个实现MD5算法的代码示例，并探讨了两种解决方案：重新编译固件和提供现成的代码片段。同时，代码段展示了如何在MicroPython中从头实现MD5哈希函数。

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不可能，绝对不可能！
我大MPY不能算md5?
我一试还特么真是！
文档写的明明白白，一跑就是没有方法
AttributeError: ‘module’ object has no attribute ‘md5’
mpy！你在干什么？这个错误好几年没有修！真欺负没几个人用这个方法么？

一顿操作猛如虎中。。。

两种思路：
一是重新编译固件
在这里插入图片描述
据说关了是因为省内存？？？WTF?

二、我就知道你懒得或者不会编译固件，喂饼，拿去吧

"""
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

#examples
print(digest(b'jd3096'))