• 文章架構
  

目的

• 日常開發中，經常涉及到針對某些值進行加密的情況（隱私資訊，例如密碼等資訊）。
• 利用 Python 某些模組將 DataFrame（pandas）某列進行MD5加密處理很方便。
• 利用Python 3 與 Python 2中不同模組處理之間的差異（例如，Python2 MD5模組與Python 3 hashlib模組）。

加密方式

hashlib 模組（Py3 docs）

• Python 2 / Python 3 中均可完成該模組的安裝.

import platform
pv = platform.python_version()
print
 
 (pv)

import hashlib

deomo_val = 'kngines'   
md5_val = hashlib.md5(deomo_val.encode('utf8')).hexdigest()
print ('src_val : %s \nmd5_val : %s' % (deomo_val,md5_val))

• Py 2 執行結果
  

• Py 3 執行結果
  

• Help on module hashlib

help('hashlib')  # 檢視該模組詳情

Help on module hashlib:

NAME
    hashlib - hashlib module - A common interface to many hash functions.

MODULE REFERENCE
    https://docs.python.org/3.6
 
/library/hashlib

    The following documentation is automatically generated from the Python
    source files.  It may be incomplete, incorrect or include features that
    are considered implementation detail and may vary between Python
    implementations.  When in doubt, consult the module reference at the
    location listed above.

DESCRIPTION
    new(name, data=b''
 
, **kwargs) - returns a new hash object implementing the
                                    given hash function; initializing the hash
                                    using the given binary data.

    Named constructor functions are also available, these are faster
    than using new(name):

    md5(), sha1(), sha224(), sha256(), sha384(), sha512(), blake2b(), blake2s(),
    sha3_224, sha3_256, sha3_384, sha3_512, shake_128, and shake_256.

    More algorithms may be available on your platform but the above are guaranteed
    to exist.  See the algorithms_guaranteed and algorithms_available attributes
    to find out what algorithm names can be passed to new().

    NOTE: If you want the adler32 or crc32 hash functions they are available in
    the zlib module.

    Choose your hash function wisely.  Some have known collision weaknesses.
    sha384 and sha512 will be slow on 32 bit platforms.

    Hash objects have these methods:
     - update(arg): Update the hash object with the bytes in arg. Repeated calls
                    are equivalent to a single call with the concatenation of all
                    the arguments.
     - digest():    Return the digest of the bytes passed to the update() method
                    so far.
     - hexdigest(): Like digest() except the digest is returned as a unicode
                    object of double length, containing only hexadecimal digits.
     - copy():      Return a copy (clone) of the hash object. This can be used to
                    efficiently compute the digests of strings that share a common
                    initial substring.

    For example, to obtain the digest of the string 'Nobody inspects the
    spammish repetition':

        >>> import hashlib
        >>> m = hashlib.md5()
        >>> m.update(b"Nobody inspects")
        >>> m.update(b" the spammish repetition")
        >>> m.digest()
        b'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9'

    More condensed:

        >>> hashlib.sha224(b"Nobody inspects the spammish repetition").hexdigest()
        'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2'

CLASSES
    builtins.object
        _blake2.blake2b
        _blake2.blake2s
        _sha3.sha3_224
        _sha3.sha3_256
        _sha3.sha3_384
        _sha3.sha3_512
        _sha3.shake_128
        _sha3.shake_256

FUNCTIONS
    md5 = openssl_md5(...)
        Returns a md5 hash object; optionally initialized with a string

    new = __hash_new(name, data=b'', **kwargs)
        new(name, data=b'') - Return a new hashing object using the named algorithm;
        optionally initialized with data (which must be bytes).

    pbkdf2_hmac(...)
        pbkdf2_hmac(hash_name, password, salt, iterations, dklen=None) -> key

        Password based key derivation function 2 (PKCS #5 v2.0) with HMAC as
        pseudorandom function.

    sha1 = openssl_sha1(...)
        Returns a sha1 hash object; optionally initialized with a string

    sha224 = openssl_sha224(...)
        Returns a sha224 hash object; optionally initialized with a string

    sha256 = openssl_sha256(...)
        Returns a sha256 hash object; optionally initialized with a string

    sha384 = openssl_sha384(...)
        Returns a sha384 hash object; optionally initialized with a string

    sha512 = openssl_sha512(...)
        Returns a sha512 hash object; optionally initialized with a string

DATA
    __all__ = ('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512', 'bla...
    algorithms_available = {'DSA', 'DSA-SHA', 'MD4', 'MD5', 'MDC2', 'RIPEM...
    algorithms_guaranteed = {'blake2b', 'blake2s', 'md5', 'sha1', 'sha224'...

FILE
    /root/anaconda3/lib/python3.6/hashlib.py

MD5 模組加密 (Python 2 自帶模組)

• 注意警告資訊（不推薦使用該方式加密，已廢棄）

import md5

src_val = 'kngines'  
mnew = md5.new()  #  Returns a md5 hash object; optionally initialized with a string
mnew.update(src_val)   #  Update this hash object's state with the provided string.
print (mnew.hexdigest())  #  Return the digest value as a string of hexadecimal digits.

• 執行結果
  

加密/校驗文字

• Linux命令 md5sum

[root@localhost xxxx]# md5sum test.log 
9e05895ce1f42385c407f71e5bb84105  test.log

[[email protected] synway]# md5sum --h
Usage: md5sum [OPTION]... [FILE]...
Print or check MD5 (128-bit) checksums.
With no FILE, or when FILE is -, read standard input.

  -b, --binary         read in binary mode
  -c, --check          read MD5 sums from the FILEs and check them
      --tag            create a BSD-style checksum
  -t, --text           read in text mode (default)
  Note: There is no difference between binary and text mode option on GNU system.

The following four options are useful only when verifying checksums:
      --quiet          don't print OK for each successfully verified file
      --status         don't output anything, status code shows success
      --strict         exit non-zero for improperly formatted checksum lines
  -w, --warn           warn about improperly formatted checksum lines

      --help     display this help and exit
      --version  output version information and exit

The sums are computed as described in RFC 1321.  When checking, the input
should be a former output of this program.  The default mode is to print
a line with checksum, a character indicating input mode ('*' for binary,
space for text), and name for each FILE.

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
For complete documentation, run: info coreutils 'md5sum invocation'

• Python 加密文字

import hashlib

f = open('./test.log', 'r')
f_md5 = hashlib.md5()
f_md5.update(f.read().encode('utf8'))

# f = open('./test.log', 'rb')
# f_md5 = hashlib.md5()
# f_md5.update(f.read())

print (f_md5.hexdigest())

• 執行結果
  

References