feat:项目完成

func/decryption.py

@@ -0,0 +1,45 @@
+import Crypto, base64
+from Crypto.Cipher import PKCS1_v1_5
+from Crypto.PublicKey import RSA
+from Crypto.Cipher import DES
+
+
+# rsa解密密文方法
+def get_max_length(rsa_key, encrypt=True):
+    """加密内容过长时 需要分段加密 换算每一段的长度.
+        :param rsa_key: 钥匙.
+        :param encrypt: 是否是加密.
+    """
+    blocksize = Crypto.Util.number.size(rsa_key.n) / 8
+    reserve_size = 11  # 预留位为11
+    if not encrypt:  # 解密时不需要考虑预留位
+        reserve_size = 0
+    maxlength = blocksize - reserve_size
+    return maxlength
+# ------------------------解密密文------------------------
+def decryption(text_encrypted_base64: str, private_key: bytes):
+    # 字符串指定编码（转为bytes）
+    text_encrypted_base64 = text_encrypted_base64.encode('utf-8')
+    # base64解码
+    text_encrypted = base64.b64decode(text_encrypted_base64)
+    # 构建私钥对象
+    private_key = RSA.importKey(private_key)
+    max_length = int(get_max_length(private_key, False))
+    cipher_private = PKCS1_v1_5.new(private_key)
+    length = len(text_encrypted)
+    if length < max_length:
+        return b''.join(cipher_private.decrypt(text_encrypted, b'xyz'))
+        # 需要分段
+    offset = 0
+    res = []
+    while length - offset > 0:
+        if length - offset > max_length:
+            res.append(cipher_private.decrypt(text_encrypted[offset:offset + max_length], b'xyz'))
+        else:
+            res.append(cipher_private.decrypt(text_encrypted[offset:], b'xyz'))
+        offset += max_length
+    text_decrypted = b''
+    for i in res:
+        text_decrypted += i
+    # print(text_decrypted.decode())
+    return text_decrypted.decode()