将python脚本TBA SHA1更改为SH256

Question

我最近被聘为初级开发人员，这是我在一家使用NetSuite的大公司的第一份工作。一位老开发人员编写了一个python脚本，该脚本处理设计师制作的图片，当图片上传到特定文件夹时，会将其上传到NetSuite

由于脚本使用SHA1，我需要将TBA更改为SHA256，因为NetSuite不再支持SHA1

我很难理解旧开发人员的代码，也很难找到关于如何将TBA从SHA1更改为SHA256的文档

这些是代码片段

import datetime
import requests
import os
import oauth2 as oauth
import json
import time
import base64
import sys
import hashlib
import hmac
    url = "https://xxxxx=1"
token = oauth.Token(key="xxxxxxxxxxx",secret="xxxxxxxxxx")
consumer = oauth.Consumer(key="xxxxxxxxxxxxxxxx",secret="xxxxxxxxxxxxxxxx")
realm="xxxxxxxxxxxxxx"
signature_method = oauth.SignatureMethod_HMAC_SHA1()

在这一部分中，我理解他初始化了方法oauth.SignatureMethod_HMAC_SHA1()

然后，当我转到oauth文件时，我发现

class SignatureMethod_HMAC_SHA1(SignatureMethod):
    name = 'HMAC-SHA1'

    def signing_base(self, request, consumer, token):
        if (not hasattr(request, 'normalized_url') or request.normalized_url is None):
            raise ValueError("Base URL for request is not set.")

        sig = (
            escape(request.method),
            escape(request.normalized_url),
            escape(request.get_normalized_parameters()),
        )

        key = '%s&' % escape(consumer.secret)
        if token:
            key += escape(token.secret)
        raw = '&'.join(sig)
        return key.encode('ascii'), raw.encode('ascii')

    def sign(self, request, consumer, token):
        """Builds the base signature string."""
        key, raw = self.signing_base(request, consumer, token)

        hashed = hmac.new(key, raw, sha1)

        # Calculate the digest base 64.
        return binascii.b2a_base64(hashed.digest())[:-1]

我仔细查看了这个文件，它不包含任何包含SHA256的方法。。只有SHA1和纯文本

我试图将值更改为SHA256，但这当然不起作用。 我试图查找oAuth2上的文档，但我只找到了非常少量的信息，而且它似乎只包含SHA1和纯文本

那么，如何将脚本更改为使用SHA256而不是SHA1运行呢

编辑以回答评论 Hashlib包含以下内容：

    class _Hash(object):
    digest_size: int
    block_size: int

    # [Python documentation note] Changed in version 3.4: The name attribute has
    # been present in CPython since its inception, but until Python 3.4 was not
    # formally specified, so may not exist on some platforms
    name: str

    def __init__(self, data: _DataType = ...) -> None: ...

    def copy(self) -> _Hash: ...
    def digest(self) -> bytes: ...
    def hexdigest(self) -> str: ...
    def update(self, arg: _DataType) -> None: ...

def md5(arg: _DataType = ...) -> _Hash: ...
def sha1(arg: _DataType = ...) -> _Hash: ...
def sha224(arg: _DataType = ...) -> _Hash: ...
def sha256(arg: _DataType = ...) -> _Hash: ...
def sha384(arg: _DataType = ...) -> _Hash: ...
def sha512(arg: _DataType = ...) -> _Hash: ...

def new(name: str, data: _DataType = ...) -> _Hash: ...

algorithms_guaranteed: AbstractSet[str]
algorithms_available: AbstractSet[str]

def pbkdf2_hmac(hash_name: str, password: _DataType, salt: _DataType, iterations: int, dklen: Optional[int] = ...) -> bytes: ...

if sys.version_info >= (3, 6):
    class _VarLenHash(object):
        digest_size: int
        block_size: int
        name: str

        def __init__(self, data: _DataType = ...) -> None: ...

        def copy(self) -> _VarLenHash: ...
        def digest(self, length: int) -> bytes: ...
        def hexdigest(self, length: int) -> str: ...
        def update(self, arg: _DataType) -> None: ...

    sha3_224 = _Hash
    sha3_256 = _Hash
    sha3_384 = _Hash
    sha3_512 = _Hash
    shake_128 = _VarLenHash
    shake_256 = _VarLenHash

    def scrypt(password: _DataType, *, salt: _DataType, n: int, r: int, p: int, maxmem: int = ..., dklen: int = ...) -> bytes: ...

    class _BlakeHash(_Hash):
        MAX_DIGEST_SIZE: int
        MAX_KEY_SIZE: int
        PERSON_SIZE: int
        SALT_SIZE: int

        def __init__(self, data: _DataType = ..., digest_size: int = ..., key: _DataType = ..., salt: _DataType = ..., person: _DataType = ..., fanout: int = ..., depth: int = ..., leaf_size: int = ..., node_offset: int = ..., node_depth: int = ..., inner_size: int = ..., last_node: bool = ...) -> None: ...

    blake2b = _BlakeHash
    blake2s = _BlakeHash

Answer 1

Haslib文件中已经有sha256（）函数， 因此，您可以尝试向oauth文件中添加一个新的类SignatureMethod_HMAC_SHA256，它可以类似于SHA1

只需如下更改hmac.new（）函数的参数：

hashed = hmac.new(key, raw, sha256)

整个班级可以是这样的：

class SignatureMethod_HMAC_SHA256(SignatureMethod):
    name = 'HMAC-SHA256'

    def signing_base(self, request, consumer, token):
        if (not hasattr(request, 'normalized_url') or request.normalized_url is None):
            raise ValueError("Base URL for request is not set.")

        sig = (
            escape(request.method),
            escape(request.normalized_url),
            escape(request.get_normalized_parameters()),
        )

        key = '%s&' % escape(consumer.secret)
        if token:
            key += escape(token.secret)
        raw = '&'.join(sig)
        return key.encode('ascii'), raw.encode('ascii')

    def sign(self, request, consumer, token):
        """Builds the base signature string."""
        key, raw = self.signing_base(request, consumer, token)

        hashed = hmac.new(key, raw, sha256)

        # Calculate the digest base 64.
        return binascii.b2a_base64(hashed.digest())[:-1]

然后，您只需在脚本中调用新的SHA256方法，而不是不推荐的SHA1方法：

signature_method = oauth.SignatureMethod_HMAC_SHA256()