import base64

from Crypto import Random
from Crypto.Cipher import PKCS1_v1_5 as Cipher_pkcs1_v1_5
from Crypto.PublicKey import RSA


class RsaCode:
    rsa_private_key = """-----BEGIN RSA PRIVATE KEY-----
    MIICXAIBAAKBgQDvluFNiF8IrIsddK0OXBAvVBJH11OKvy9er1tRGn9yEJoHCJY3
    EU/xz2LasCK8AwgRIqGJbvDBgRa70c3QT9j+wPqNqqJCSoSEKifnDUk1RgUReJT6
    iqWaJyfM+WM3aHnKl61RZL4NV5qKe4CHMtaH/JtBCC/JzpuFER1P1IhCtQIDAQAB
    AoGAaFYQb68/k4twWbeB1YsKEVJPU7HV08pGWrmKztr3PTk1mnKG2BxV8DwcFJg3
    yCCZ1rx6FFuXxOzudYR8WIctO4wdsEbFky/cEGsfc6JJjiktmZaQ7MvobGNwnoFJ
    QvRxDd+5uD87JE19iBSgUpLVtXbv+pZxSpD70vitnMdSctECQQD66Z5HsuC8DUPu
    OLQHNN4ra5Op179Xlq7LiEFW4GaVgonw24kiLX23c7CK7295Rgxct1fwQKyuU9br
    n2uj8toDAkEA9HJ85BWlm2OfUm6VI3Q99rjlpCnhRyz70+sEtf7if1SpctVxNTkX
    UOnXlpPTohjAHNhzh9fa1hh/ySH9sRMu5wJAa//8uh3br/YBxFsx2lw+OPBQGe4c
    lSXtzPu0LCHg5f/PQhYs28I696jbV6IiGFA3Z/0e4/HiohLCUp9HJMWWYwJACE53
    pfyCUyRwfomZccn6bQ7dZtWxfQyvRgU/dLvDkJYc5/UO0sMs4qf/lnNRhrmWlaRZ
    UK1qF0pf1ULdbw360wJBAObrYopW2kvIlE09j9SEgNtgVsmfZlf85c4EAZrFJP/T
    8nMNKQGo92Gd3HvbjJ+ZBOP1IFt+FDAsXeSLWLAwJrg=
    -----END RSA PRIVATE KEY-----"""

    rsa_public_key = """-----BEGIN PUBLIC KEY-----
    MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDvluFNiF8IrIsddK0OXBAvVBJH
    11OKvy9er1tRGn9yEJoHCJY3EU/xz2LasCK8AwgRIqGJbvDBgRa70c3QT9j+wPqN
    qqJCSoSEKifnDUk1RgUReJT6iqWaJyfM+WM3aHnKl61RZL4NV5qKe4CHMtaH/JtB
    CC/JzpuFER1P1IhCtQIDAQAB
    -----END PUBLIC KEY-----
    """

    def encrypt(self, msg):
        msg = msg.encode('utf-8')
        rsakey = RSA.importKey(self.rsa_public_key)
        cipher = Cipher_pkcs1_v1_5.new(rsakey)
        cipher_text = base64.b64encode(cipher.encrypt(msg))
        return cipher_text

    def decrypt(self, cipher_text):
        rsakey = RSA.importKey(self.rsa_private_key)
        cipher = Cipher_pkcs1_v1_5.new(rsakey)
        random_generator = Random.new().read
        text = cipher.decrypt(base64.b64decode(cipher_text), random_generator)
        return text.decode('utf8')

    def long_encrypt(self, msg):
        msg = msg.encode('utf-8')
        length = len(msg)
        default_length = 117
        # 公钥加密
        pubobj = Cipher_pkcs1_v1_5.new(RSA.importKey(self.rsa_public_key))
        # 长度不用分段
        if length < default_length:
            return base64.b64encode(pubobj.encrypt(msg))
        # 需要分段
        offset = 0
        res = []
        while length - offset > 0:
            if length - offset > default_length:
                res.append(pubobj.encrypt(msg[offset:offset + default_length]))
            else:
                res.append(pubobj.encrypt(msg[offset:]))
            offset += default_length
        byte_data = b''.join(res)
        return base64.b64encode(byte_data)

    def long_decrypt(self, msg):
        msg = base64.b64decode(msg)
        print(msg)
        length = len(msg)
        default_length = 128
        # 私钥解密
        priobj = Cipher_pkcs1_v1_5.new(RSA.importKey(self.rsa_private_key))
        # 长度不用分段
        if length < default_length:
            return b''.join(priobj.decrypt(msg, b'xyz'))
        # 需要分段
        offset = 0
        res = []
        while length - offset > 0:
            if length - offset > default_length:
                res.append(priobj.decrypt(msg[offset:offset + default_length], b'xyz'))
            else:
                res.append(priobj.decrypt(msg[offset:], b'xyz'))
            offset += default_length

        return b''.join(res).decode('utf8')


message = """
话说凤姐儿自贾琏送黛玉往扬州去后,心中实在无趣,每到晚间不过同平儿说
笑一回,就胡乱睡了。这日夜间和平儿灯下拥炉,早命浓熏绣被,二人睡下,屈指
计算行程该到何处。不知不觉已交三鼓,平儿已睡熟了。凤姐方觉睡眼微蒙,恍惚
只见秦氏从外走进来,含笑说道:“婶娘好睡!我今日回去,你也不送我一程。因
娘儿们素日相好,我舍不得婶娘,故来别你一别。还有一件心愿未了,非告诉婶娘,
别人未必中用。”凤姐听了,恍惚问道:“有何心愿?只管托我就是了。”秦氏道:
“婶娘,你是个脂粉队里的英雄,连那些束带顶冠的男子也不能过你。你如何连两
句俗语也不晓得?常言:‘月满则亏,水满则溢。’又道是:‘登高必跌重。’如
今我们家赫赫扬扬,已将百载,一日倘或乐极生悲,若应了那句‘树倒猢狲散’的
俗语,岂不虚称了一世诗书旧族了?”凤姐听了此话,心胸不快,十分敬畏,忙问
道:“这话虑的极是,但有何法可以永保无虞?”秦氏冷笑道:“婶娘好痴也!‘否
极泰来’,荣辱自古周而复始,岂人力所能常保的?但如今能于荣时筹画下将来衰
时的世业,亦可以常远保全了。即如今日诸事俱妥,只有两件未妥,若把此事如此
一行,则后日可保无患了。”
"""

test = RsaCode()
res_en = test.long_encrypt(message)
print('res_en', res_en)
res_de = test.long_decrypt(res_en)
print('res_de', res_de)

4 Comments

  1. import sys

    reload(sys)
    sys.setdefaultencoding(‘utf-8’)
    在Python2上边,增加上面即可解决。

    多谢。

  2. $ python new.py
    Traceback (most recent call last):
    File “new.py”, line 110, in
    res_en = test.long_encrypt(message)
    File “new.py”, line 49, in long_encrypt
    msg = msg.encode(‘utf-8’)
    UnicodeDecodeError: ‘ascii’ codec can’t decode byte 0xe8 in position 1: ordinal not in range(128)
    $ python –version
    Python 2.7.12

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