python实现rsa\aes\sm2\sm4加解密

相关依赖：

1. gmssl==3.2.2
2. pycryptodome == 3.9.7

基类：

import abc
import base64
import random
from enum import Enum

from Crypto.Cipher import PKCS1_OAEP, AES
from Crypto.Hash import SHA256, SHA1
from Crypto.PublicKey import RSA
from Crypto.Signature import pss
from gmssl import sm2, sm4


# str 不是 16 的倍数那就补足为 16 的倍数
# key = '1234567890123456'  # 密钥长度必须为 16、24 或 32 位，分别对应 AES-128、AES-192 和 AES-256
def pad_to_16(key):
    while len(key) % 16 != 0:
        key += '\0'
    return str.encode(key)  # 返回bytes


class BaseEncryption(metaclass=abc.ABCMeta):

    @abc.abstractmethod
    def encrypt(self, *args, **kwargs): pass

    @abc.abstractmethod
    def decrypt(self, *args, **kwargs): pass

Rsa分段加解密实现(适用于pkcs1/8格式的2048bit私钥)：

class RsaEncryption(BaseEncryption):
    @staticmethod
    def encrypt(plaintext, public_key):
        """
        公钥分段加密
        rsa/ecb/oaepwithsha-256andmgf1padding 算法加密
        """
        max_encrypt_block = 190  # 最长加密块长度
        public_key = RSA.import_key(public_key)
        data = plaintext.encode('utf-8')
        cipher = PKCS1_OAEP.new(public_key, hashAlgo=SHA256, mgfunc=lambda x, y: pss.MGF1(x, y, SHA1))

        if len(data) <= max_encrypt_block:
            text = cipher.encrypt(data)
        else:
            text = b''
            for i in range(0, len(data), max_encrypt_block):
                text += cipher.encrypt(data[i:i + max_encrypt_block])

        return base64.b64encode(text).decode()

    @staticmethod
    def decrypt(encrypt_text, private_key):
        """
        私钥分段解密
        对 rsa/ecb/oaepwithsha-256andmgf1padding 加密的信息做解密
        """
        max_decrypt_block = 256  # 最长解密块为密钥长度/8
        res = []
        b64_data = base64.b64decode(encrypt_text)
        private_key = RSA.import_key(private_key)
        cipher = PKCS1_OAEP.new(private_key, hashAlgo=SHA256, mgfunc=lambda x, y: pss.MGF1(x, y, SHA1))
        if len(b64_data) <= max_decrypt_block:
            text = cipher.decrypt(b64_data)
            return text.decode('utf-8')
        else:
            for i in range(0, len(b64_data), max_decrypt_block):
                res.append(cipher.decrypt(b64_data[i:i + max_decrypt_block]))
            return str(b''.join(res), encoding='utf-8')

AES加解密：

class AesEncryption(BaseEncryption):

    @staticmethod
    def encrypt(plaintext, key: str = "api-test@test-api"):
        text = base64.b64encode(plaintext.encode('utf-8')).decode('ascii')
        # 初始化加密器
        aes = AES.new(pad_to_16(key), AES.MODE_ECB)
        # 先进行 aes 加密
        encrypt_aes = aes.encrypt(pad_to_16(text))
        # 用 base64 转成字符串形式
        encrypted_text = str(base64.encodebytes(encrypt_aes), encoding='utf-8')  # 执行加密并转码返回bytes
        return encrypted_text.strip()

    @staticmethod
    def decrypt(encrypted_text, key: str = "api-test@test-api"):
        # 初始化加密器
        aes = AES.new(pad_to_16(key), AES.MODE_ECB)
        # 优先逆向解密 base64 成 bytes
        base64_decrypted = base64.decodebytes(encrypted_text.encode(encoding='utf-8'))
        decrypted_text = str(aes.decrypt(base64_decrypted), encoding='utf-8')  # 执行解密密并转码返回str
        decrypted_text = base64.b64decode(decrypted_text.encode('utf-8')).decode('utf-8')
        return decrypted_text

SM2加解密：

class Sm2Encryption(BaseEncryption):
    @staticmethod
    def encrypt(plaintext: str, public_key: str) -> str:
        """
        sm2 加密
        :param plaintext: 待加密字符串(bytes)
        :param public_key: 加密用的 16 进制公钥
        :return:
        """
        prefix = "04"  # 压缩标识：02/03：压缩；04：未压缩
        enc_byte = plaintext.encode()
        # 此处必须去掉前两位的压缩标识，CryptSM2的init源码中有坑使用的是public_key.lstrip("04")会移除前面所有0或4的字符串
        public_key = public_key[2:] if public_key.startswith(prefix) else public_key
        sm2_crypt = sm2.CryptSM2(private_key='', public_key=public_key, mode=1, asn1=True)
        return base64.b64encode(bytes.fromhex(prefix) + sm2_crypt.encrypt(enc_byte)).decode()

    @staticmethod
    def decrypt(encrypted_text: str, private_key: str):
        """
        sm2 解密,密文要从第二位开始解密
        :param encrypted_text: 待解密字符串(bytes)
        :param private_key: 解密用的 16 进制私钥
        :return:
        """
        # sm2加密后拼接了压缩标识【04】，故而解密需从第二位开始解密
        b64 = base64.b64decode(encrypted_text.encode())[1:]
        sm2_crypt = sm2.CryptSM2(private_key=private_key, public_key='', mode=1, asn1=True)
        return sm2_crypt.decrypt(b64).decode()

SM4加解密：

class Sm4Encryption(BaseEncryption):
    class CipherModeEnum(Enum):
        ECB = "ecb"
        CBC = "cbc"

    def __init__(self, cipher_mode: str = CipherModeEnum.ECB.value):
        """

        :param cipher_mode: ecb or cbc
        """
        if cipher_mode not in Sm4Encryption.CipherModeEnum._value2member_map_:
            raise ValueError('cipher mode just support cbc or ecb')
        self.cipher_mode = cipher_mode

    def encrypt(self, plaintext: str, key: str = "api-test@test-api") -> str:
        """
        :param key:
        :param plaintext:
        :return:
        """

        enc_data = plaintext.encode()
        crypt_sm4 = sm4.CryptSM4()
        crypt_sm4.set_key(key.encode(), sm4.SM4_ENCRYPT)
        iv = b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
        if self.cipher_mode == 'ecb':
            encrypt_value = crypt_sm4.crypt_ecb(enc_data)
        else:
            encrypt_value = crypt_sm4.crypt_cbc(iv, enc_data)
        return base64.b64encode(bytes.fromhex(encrypt_value.hex())).decode(encoding="utf-8")

    def decrypt(self, encrypted_text: str, key: str = "api-test@test-api"):
        """

        :param key:
        :param encrypted_text:
        :return:
        """

        b64 = base64.b64decode(encrypted_text)
        crypt_sm4 = sm4.CryptSM4()
        crypt_sm4.set_key(key.encode(), sm4.SM4_DECRYPT)
        iv = b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
        if self.cipher_mode == 'ecb':
            decrypt_value = crypt_sm4.crypt_ecb(b64)
        else:
            decrypt_value = crypt_sm4.crypt_cbc(iv, b64)
        return decrypt_value.decode(encoding='utf-8')

利用枚举扩展：

class EncryptionAlgoEnum(Enum):
    RSA = (1, RsaEncryption, "rsa")
    SM2 = (2, Sm2Encryption, "sm2")
    AES = (3, AesEncryption, "aes")
    SM4 = (4, Sm4Encryption, "sm4")

    @property
    def code(self):
        return self.value[0]

    @property
    def interface(self):
        return self.value[1]

    @property
    def tag(self):
        return self.value[2]

    @classmethod
    def get_crypt_algo_type_by_code(cls, code):
        return [k for k in EncryptionAlgoEnum.__members__.items() if k[1].value[0] == int(code)][-1][1]

    @classmethod
    def get_crypt_algo_type_by_tag(cls, tag):
        return [k for k in EncryptionAlgoEnum.__members__.items() if k[1].value[1] == str(tag)][-1][1]

使用：

if __name__ == '__main__':
    rsa_pri_key = """-----BEGIN PRIVATE KEY-----
    MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCR2eBgYkRLPZgs
    OFf2/81o5i69/S2rjGic/YW7Clm1mokiYZ1YLDEHH2c7tdvXJrmfLavc4ngruX4y
    Uddn9A2+Ts+B5YbsbRrzOJ9ok6CA0MaVpAYejmaT/bq3e2jBY2rwI7NBzfx7c1H/
    gRNY2kMTGK6l2aI4fg8jxCLt+5jOU9UbvEmwd4VNBcqfUpb9VTukdCfXt9p3jtLB
    ej2bc2CQwReuv8FldhuGzDgHLvRRplXeGQ1i2OwvCguJiZH8mCq4/18336Mf0Xoc
    bG7BmQYATPf+0OOkb1fJ9vDTtgLDB0T1BxiajoUNP5F4RLWer0eIDnF6iO46zwjC
    czasKs3XAgMBAAECggEAEDog7ChSt9pRAW59XvZD6M1fWvT9rU3wX7MXO2Gh7IIW
    itQ4eNRl2giE6FBJ9syQr2SZ7/fkbdzz7O5NHHw7QTasgKPEWK6k5nWgyrZOD7bq
    uUBoC+NFB2cd7IcW9xk0DyaxrXsZAbUpZNd8CxExkEDZQYuOsGFaFt0eE8M/04i2
    L9QPB3WQ3lN+sK8q9AfTBK3yv8MkGI8+00Ihp9TLZ1XqhtvlJSxKs6vLFAcH8rzP
    ZKsSnqM7KGVlv5azkIeFeNLWHIzjepjA3V4ncnbu4nOBiuNGlcNh9++ELmHF+fNk
    EmGO4u+GTgfuaECFtjdeq+DUH8JJ0dPXOEMhGX8p2QKBgQC5yxa3CodwW832dQ+u
    pQaN3J7pZfgUrHK1idGSyGxuehEU+wyjSSwOC1eUGaP4dmj6azmvz5Ng4xPa7Ew3
    TemNz7HGVnx8L+YMYa+cJHEfaWEvByin5nnPgy79Fy6aO49uK1egFGFNSPV7i4Sd
    nnGt/8ye+g65uS2MwSxAN3V/WQKBgQDI9u8G0xFNI3tg7glFTr9yy/WihCZ495BZ
    Bq7MAQWsaNUOR0Rh6/+gDDG2j0m3Yjnk9JFXpuctZGnVyWi1fBGjjW25e8NiyBjz
    BJbpPNrkxJWpdeG51gKaOUgz2YfnooHKrt/3Cn1LO6KrNBPZMw7++NpWWh+aRE6A
    cVWFOUbArwKBgHYLQdBkQS8zNQYc1CzrLuHdRZ4XKmrAMlWDTgNLkhETP10sMJhi
    OjpmHGu9ar/HQ+WvUMSSRxoszIWw0q/ksbpnNpVEh+1DZY+CVVgIk1MY2iVOEBe1
    SLl+qNEm9HYL15JwuUi9CiFXdJjdSRH4BFRADRsI12hK7lTauynF0sJpAoGBAIt/
    fWRLVxMoshgSo7TMePCCy7tH6DzH/BcQIH3Tp9CJ5HrI1Zrzarn6PPfwdscpE+7u
    JYWmgYpszVptOJXhzYyuO6ApXPNQ2qC2atr0Ny3dl9XN0iZhe+T6Jjh3o3MSxu2e
    fjDJwzdZ6gzVVYHLg3lR3J1cadt31tYp1adonshZAoGAWTgi+QE1ts0HwztCw2CV
    3AeKB6wZNfFNYEE4bwZhwWUQMOEjnlwh9IHwjMh5POyFD5BR/YAgihW3/u052/9O
    1w7I18QvqjwSyPRVMXhItT51P5QNsugRRcsCNTHvWdozjgKuIP5pLTK+nwE7PPl3
    UUNybmttjqJCyfndIOUOVlQ=
    -----END PRIVATE KEY-----"""
    rsa_pub_key = """-----BEGIN PUBLIC KEY-----
    MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAkdngYGJESz2YLDhX9v/N
    aOYuvf0tq4xonP2FuwpZtZqJImGdWCwxBx9nO7Xb1ya5ny2r3OJ4K7l+MlHXZ/QN
    vk7PgeWG7G0a8zifaJOggNDGlaQGHo5mk/26t3towWNq8COzQc38e3NR/4ETWNpD
    ExiupdmiOH4PI8Qi7fuYzlPVG7xJsHeFTQXKn1KW/VU7pHQn17fad47SwXo9m3Ng
    kMEXrr/BZXYbhsw4By70UaZV3hkNYtjsLwoLiYmR/JgquP9fN9+jH9F6HGxuwZkG
    AEz3/tDjpG9Xyfbw07YCwwdE9QcYmo6FDT+ReES1nq9HiA5xeojuOs8IwnM2rCrN
    1wIDAQAB
    -----END PUBLIC KEY-----"""
    sm_pri_key = 'c124889fb35a23cd3092a62f92ad9f3aafd07876c5bb08bf147ac27b43e15ec7'
    sm_pub_key = '04aaf5c364472a7b26ab254a834f5b8104ef06387ea7cc9104dd183c6ace0a647a70f19e704721919bcf955a1be8c69c9a9ead286a7d1fdfe067145244c377e1ce'
    test_data = "test"
    algo = random.choice([i for i in range(1, 5)])
    encryption_algo = EncryptionAlgoEnum.get_crypt_algo_type_by_code(algo)
    print(f"加密算法为：{encryption_algo.tag}")
    if encryption_algo.code == 1:
        pub_key = rsa_pub_key
        pri_key = rsa_pri_key
    elif encryption_algo.code == 2:
        pub_key = sm_pub_key
        pri_key = sm_pri_key
    else:
        pub_key = pri_key = "test-api@api-test"
    encryption = encryption_algo.interface()
    encrypt_str = encryption.encrypt(test_data, pub_key)
    print("加密结果：", encrypt_str)
    decrypt_str = encryption.decrypt(encrypt_str, pri_key)
    print("解密结果：", decrypt_str)

"""
加密算法为：rsa
加密结果： aUeC06g7ub3KBcEQ3Fhhl7y9oNk/8pF2Ha2rbXC9s+i5IAB+upEbcie8ZTfG8xug7u/FkjJOPXOzLw7C5YwEZKe8M5cQ1GGa1AyyeQkkb1s2qR3ndx9KomlajgtvRC1Dq/HImKQ3Y3YXF+HXQFYpJYEnWjzaKwx6F9KbdhdMUIHCPx3tzCi/hERO6U7dz2QpMXEfOk4MgrOTPEEnJhxWDe3JZu4woTo8OoWOubyLtTdu+MSQOpj1FwUEDjH+qNkitR8kQTe2rjKBoZZj17Qh+4YFzs3IvRkhrer5v0XOPB2VSHEf+fmCi3b7OT9BzMXLupg121rXOYd90ZAi1K46cQ==
解密结果： test
"""

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