Python使用Rsa公钥加密，私钥解密以及私钥签名，公钥验签的例子

安装Cryptor库

wget https://github.com/dlitz/pycrypto/archive/master.zip 
python setup.py install

生成rsa公钥和私钥

私钥
openssl genrsa -out ./myPrivateKey.pem -passout pass:"f00bar" -des3 2048
用私钥生成公钥
openssl rsa -pubout -in ./myPrivateKey.pem -passin pass:"f00bar" -out ./myPublicKey.pem

Rsa公钥加密，私钥解密的Python代码

---

encrypto.py

#!/usr/bin/python
from Crypto.PublicKey import RSA
def encrypt(message):
    externKey="./myPublicKey.pem"
    privatekey = open(externKey, "r")
    encryptor = RSA.importKey(privatekey, passphrase="f00bar")
    encriptedData=encryptor.encrypt(message, 0)
    file = open("./cryptThingy.txt", "wb")
    file.write(encriptedData[0])
    file.close()
if __name__ == "__main__":
    encryptedThingy=encrypt("Loren ipsum")

---

decrypto.py

#!/usr/bin/python
from Crypto.PublicKey import RSA
def decrypt():
    externKey="./myPrivateKey.pem"
    publickey = open(externKey, "r")
    decryptor = RSA.importKey(publickey, passphrase="f00bar")
    retval=None
    file = open("./cryptThingy.txt", "rb")
    retval = decryptor.decrypt(file.read())
    file.close()
    return retval
if __name__ == "__main__":
    decryptedThingy=decrypt()
    print "Decrypted: %s" % decryptedThingy

Rsa私钥签名，公钥验签的Python代码

---

sign.py

from Crypto.PublicKey import RSA
from Crypto.Hash import SHA
from Crypto.Signature import PKCS1_v1_5
from base64 import b64encode
def rsa_sign(message):
    private_key_file = open('./myPrivateKey.pem', 'r')
    private_key = RSA.importKey(private_key_file)
    hash_obj = SHA.new(message)
    signer = PKCS1_v1_5.new(private_key)
    d = b64encode(signer.sign(hash_obj))
    file = open('./signThing.txt', 'wb')
    file.write(d)
    file.close()
if '__main__' == __name__:
    rsa_sign('zhangshibo')

---

verify.py

from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA
from base64 import b64decode
def rsa_verify(message):
    public_key_file = open('./myPublicKey.pem', 'r')
    public_key = RSA.importKey(public_key_file)
    sign_file = open('./signThing.txt', 'r')
    sign = b64decode(sign_file.read())
    h = SHA.new(message)
    verifier = PKCS1_v1_5.new(public_key)
    return verifier.verify(h, sign)
if '__main__' == __name__:
    print rsa_verify('zhangshibo')

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