python 实现RSA数字签名

from Crypto.PublicKey import RSA

from Crypto.Cipher import PKCS1_v1_5 as Cipher_pkcs1_v1_5

from Crypto.Signature import PKCS1_v1_5 as Signature_pkcs1_v1_5

import base64

# 私钥

private_key = '''-----BEGIN RSA PRIVATE KEY-----

5353dfggd

-----END RSA PRIVATE KEY-----

'''

# 公钥

public_key = '''-----BEGIN PUBLIC KEY-----

hfgghftetet

-----END PUBLIC KEY-----'''

def rsa_sign(plaintext, hash_algorithm=Crypto.Hash.MD5):

    """RSA 数字签名，私钥进行签名"""

    signer = Signature_pkcs1_v1_5.new(RSA.importKey(private_key))

    # hash算法必须要pycrypto库里的hash算法，不能直接用系统hashlib库，pycrypto是封装的hashlib

    hash_value = hash_algorithm.new(plaintext.encode('utf-8'))

    signature = signer.sign(hash_value)

    signature = base64.b64encode(signature)

    return signature.decode()

def rsa_verify(sign, plaintext, hash_algorithm=Crypto.Hash.MD5):

    """校验RSA 数字验签，公钥进行验签"""

    sign = base64.b64decode(sign)

    hash_value = hash_algorithm.new(plaintext.encode('utf-8'))

    verifier = Signature_pkcs1_v1_5.new(RSA.importKey(public_key))

    return verifier.verify(hash_value, sign)

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