需求：
1 ：员工在填写用户的手机号时，直接填写，在django后台中输入
2：当员工在后台确认要存储到数据库时，后台将会把手机号进行加密存储，当数据库被黑之后，手机号字段为加密字符
3：员工在后台中进行查看客户手机号时，需要正常显示，非加密状态
4：直接把公钥和私钥存放到代码里面，不要额外读取存储公钥私钥

models.py文件中代码如下

# -------------------------------------------------------------------------------------
# 手机号加密插件
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization, hashes
from cryptography.hazmat.primitives.asymmetric import padding
import base64

# -------------------------------------------------------------------------------------
class Order(models.Model):

    id = models.BigAutoField(primary_key=True, unique=True, verbose_name='订单id', )
    shoujihao = models.TextField(verbose_name='客户手机号码', max_length=30000, blank=True)
    # -------------------------------------------------------------------------------------
    # 手机号解密
    def get_shoujihao(self):
        # 1：获取到数据库中的字符串 a
        # 2：把字符串转换成字节类型 b
        # 3：对字节b进行解密为 c
        # 4:返回c
        if len(self.shoujihao)>=20:
            shoujihao1=self.shoujihao
            shoujihao1 = base64.b64decode(shoujihao1)

            # 读取私钥文件
            private_key="""-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----"""
            key = serialization.load_pem_private_key(private_key.encode(), password=None, backend=default_backend())
            decrypted_data = key.decrypt(shoujihao1, padding.OAEP(mgf=padding.MGF1(algorithm=hashes.SHA256()),
                                                                      algorithm=hashes.SHA256(), label=None))
            # decrypted_data 的类型为字节
            decrypted_data=decrypted_data.decode('utf-8')
            # decrypted_data.decode()之后的类型为字符串
            shoujihao1=decrypted_data
            print("类型")
            print(type(decrypted_data))
            print(decrypted_data)

            # 打印解密后的消息
            color_code = 'green'
            return format_html('<span style="color:{};">{}</span>', color_code, shoujihao1)
        else:
            color_code = 'green'
            return format_html('<span style="color:{};">-</span>', color_code, )

    get_shoujihao.short_description = '手机号'

admin.py文件中代码如下

# -------------------------------------------------------------------------------------
# 手机号加密插件
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization, hashes
from cryptography.hazmat.primitives.asymmetric import padding
import base64

# -------------------------------------------------------------------------------------
# -------------------------------------------------------------------------------------
class Order_salesmanAdmin(admin.ModelAdmin):
    # -------------------------------------------------------------------------------------
    # 手机号加密显示 和手机号显示
    # 设置录入后台中展示的数据字段
    list_display = ['id',
                    'shoujihao', 
                    'get_shoujihao',
                    ]

    def save_model(self, request, obj, form, change):
        if not obj.pk:
            obj.userid = UserProfile.objects.get(user=request.user)
            # 客户手机号加密存储
            shoujihao1 = obj.shoujihao
            if len(shoujihao1) == 11:
                # 1:在admin后台中，允许用户输入的是字符串类型的数据
                # 2:加密之后得到的是字节类型，
                # 3:把字节类型的编码为utf-8的字符串类型 存储在数据库中

                # 读取公钥文件
                public_key = """-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAp4vQEgBPcCy09xmJDVFx
juYk+USqBNgUxIHF4+E9Vot1rDWUncFSIERsEqTq9wIlVsgiVtRJ/0FxHLIgZPlF
TkP6qoKbTRI9ySoBHs4SJXy8r63rxPRgkjEsVR/hcsZAt7LHjNnZKWd8b1yi0AO5
6QIDAQAB
-----END PUBLIC KEY-----"""

                key = serialization.load_pem_public_key(public_key.encode(), backend=default_backend())
                encrypted_data = key.encrypt(shoujihao1.encode(),
                                                padding.OAEP(mgf=padding.MGF1(algorithm=hashes.SHA256()),
                                                            algorithm=hashes.SHA256(), label=None))
                # 加密后的数据类型 encrypted_data <class 'bytes'> 字节类型
                encrypted_data=base64.b64encode(encrypted_data).decode('utf-8')

                # decode为utf-8之后的数据类型  为字符串类型，这样才可以在字符字段中存储
                # print("decode之后的数据类型")
                # print(type(encrypted_data))
                # print(encrypted_data)

                obj.shoujihao =encrypted_data
            # -------------------------------------------------------------------------------------

        if not change:
            obj.userid = UserProfile.objects.get(user=request.user)
        else:
            obj.updated_userid = UserProfile.objects.get(user=request.user)
        obj.save()
        super().save_model(request, obj, form, change)

    # -------------------------------------------------------------------------------------