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EncryptUtil.py

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+import os
+
+from Crypto.Cipher import DES
+import rsa
+import hashlib
+
+
+# 生成公私钥对
+from rsa import common, transform, core
+
+
+def generate_keypair(user_name):
+    (pubkey, prikey) = rsa.newkeys(1024)
+    # 存储公钥
+    with open(user_name + "_pub.pem", "wb") as fp:
+        fp.write(pubkey.save_pkcs1())
+    # 存储私钥
+    with open(user_name + "_pri.pem", "wb") as fp:
+        fp.write(prikey.save_pkcs1())
+
+
+# 使用rsa加密
+def rsa_encrypt(msg, user_name):
+    # 读取公钥
+    with open(user_name + "_pub.pem", "rb") as fp:
+        pubkey = rsa.PublicKey.load_pkcs1(fp.read())
+    # 使用该用户公钥加密
+    return rsa.encrypt(msg, pubkey)
+
+
+# 使用rsa解密
+def rsa_decrypt(crypto, user_name):
+    # 读取私钥
+    with open(user_name + "_pri.pem", "rb") as fp:
+        prikey = rsa.PrivateKey.load_pkcs1(fp.read())
+    # 解密
+    return rsa.decrypt(crypto, prikey)
+
+
+# 使用rsa签名
+def rsa_sign(msg: bytes, user_name: str):
+    # 读取私钥
+    with open(user_name + "_pri.pem", "rb") as fp:
+        prikey = rsa.PrivateKey.load_pkcs1(fp.read())
+    # 签名
+    return rsa.sign_hash(msg, prikey, "MD5")
+
+
+# 通过签名计算哈希
+def rsa_verify(sign: bytes, user_name: str):
+    # 读取公钥
+    with open(user_name + "_pub.pem", "rb") as fp:
+        pubkey = rsa.PublicKey.load_pkcs1(fp.read())
+    key_length = common.byte_size(pubkey.n)
+    encrypted = transform.bytes2int(sign)
+    decrypted = core.decrypt_int(encrypted, pubkey.e, pubkey.n)
+    return transform.int2bytes(decrypted, key_length)[-32:]
+
+
+# 计算散列值
+def cal_md5(data: bytes) -> str:
+    h = hashlib.md5()
+    h.update(data)
+    return h.hexdigest()
+
+
+# 生成DES密钥
+def generate_des_key() -> bytes:
+    return os.urandom(8)
+
+
+# 使用DES加密
+def des_encrypt(des_key: bytes, data: bytes):
+    # 生成DES对象，使用ECB加密模式
+    des = DES.new(des_key, DES.MODE_ECB)
+    padded_text = pad(data)
+    return des.encrypt(padded_text)
+
+
+# 使用DES解密
+def des_decrypt(des_key: bytes, data: bytes):
+    # 生成DES对象，使用ECB加密模式
+    des = DES.new(des_key, DES.MODE_ECB)
+    return des.decrypt(data)
+
+
+# 如果需要加密的内容不是16的倍数，则需要补足
+def pad(text: bytes):
+    while len(text) % 8 != 0:
+        text += b" "
+    return text