python-hash algorithm and md5

Original link: https://www.jianshu.com/u/8f2987e2f9fb

One, HASH

HASH-- 'hash' the input of arbitrary length value, generating a hash value of a fixed length.

Note: hash value generated when the python program of this operation has been, the next time the program will generate another hash value calculation.

Two, MD5

MD5 message digest algorithm

2.1 features:

1, of any length, algorithm, a fixed length output 128 through [image outside the chain dump value (digital fingerprint) failure.

2, different input, different results (Uniqueness)

2.2 Features:

1, compressibility: enter any, MD5 value fixed length

2, it is easy to calculate: the original data can be easily calculated from the value of MD5.

3, anti-Modify: modify a little bit, MD5 value calculated very different.

4, strong collision: a known MD5 value, to the same value by calculating other values is difficult.

2.3 Are reversible?

MD5 hash algorithm is based, in the calculation process the original data is lost, it is irreversible.

2.4 What is the use?

1. prevent tampering

2. Preventing see the plaintext

3. Digital Signature

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'''
# @File    : 4.10.hash加密算法.py
# @Software: PyCharm

import hashlib

# 1.将字符串，通过加密算法，变成固定长度的输出
s = 'abc'
print(len(str(hash(s)))*4, hash(s))

# 2.生成md5数字指纹。
# 第1种写法：
s2 = b'!@abc'  # 定义字节型字符串
md = hashlib.md5()  # 导入md5算法
md.update(s2)  # 把值传给md5算法

print(md.digest())  # 生成一个128位的2进制数
print('MD5', '长度:', len(md.hexdigest())*4, md.hexdigest())
# 第2种写法：
print(hashlib.md5("!@abc".encode("utf-8")).hexdigest())

# 3.SHA-1

hash = hashlib.sha1()
hash.update('admin'.encode('utf-8'))
print('SHA-1', '长度:', len(hash.hexdigest())*4, hash.hexdigest())

# 4.SHA-256

hash = hashlib.sha256()
hash.update('admin'.encode('utf-8'))
print('SHA-256', '长度:', len(hash.hexdigest())*4, hash.hexdigest())

# 5.SHA-384

hash = hashlib.sha384()
hash.update('admin'.encode('utf-8'))
print('SHA-384', '长度:', len(hash.hexdigest())*4, hash.hexdigest())

# 5.SHA-512

hash = hashlib.sha512()
hash.update('admin'.encode('utf-8'))
print('SHA-384', '长度:', len(hash.hexdigest())*4, hash.hexdigest())

python-hash algorithm and md5

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