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我正在尝试使用Python密码库和RSA加密和解密密码。密钥生成正常工作，加密工作，但是当它涉及到解密的密码，我碰到这样的追踪错误消息：RSA“长度必须等于密钥大小”错误
raise ValueError("Ciphertext length must be equal to key size.")
我的加密和解密代码如下所示：
class AppCryptography():
def generate_rsa_keypair(self, bits=4096):
return rsa.generate_private_key(
public_exponent=65537,
key_size=bits,
backend=default_backend()
)
def load_private_key(self, pem_file_path):
with open(pem_file_path, "rb") as key_file:
private_key = serialization.load_pem_private_key(
key_file.read(),
password=None,
backend=default_backend()
)
return private_key
def load_public_key(self, pem_file_path):
with open(pem_file_path, "rb") as key_file:
public_key = serialization.load_pem_public_key(
key_file.read(),
backend=default_backend()
)
return public_key
def encrypt_password(self, public_key, password):
password = bytes(password) if not isinstance(password, bytes) else password
public_key = public_key if isinstance(public_key, RSAPublicKey) else self.load_pem_public_key(
public_key_pem_export=public_key
)
cipher_pass = public_key.encrypt(
password,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
algorithm=hashes.SHA1(),
label=None
)
)
return str(base64.b64encode(cipher_pass))
def decrypt(self, private_key, cipher_pass):
cipher_pass = base64.b64decode(cipher_pass) if not isinstance(cipher_pass, bytes) else cipher_pass
private_key = private_key if isinstance(private_key, RSAPrivateKey) else self.load_pem_private_key(
private_key_pem_export=private_key
)
plain_text_pass = private_key.decrypt(
cipher_pass,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
algorithm=hashes.SHA1(),
label=None
)
)
return str(plain_text_pass)
当我运行此脚本错误发生：
crypter = AppCryptography()
backend_public_key = crypter.load_public_key(dir_path + "/util/keys/backend_public_key.pem")
frontend_private_key = crypter.load_private_key(dir_path + "/util/keys/frontend_private_key.pem")
encrypted_password = crypter.encrypt_password(backend_public_key, password)
signature = crypter.sign_data(frontend_private_key, password)
backend_private_key = crypter.load_private_key(dir_path + "/util/keys/backend_private_key.pem")
cleartext = crypter.decrypt(backend_private_key, encrypted_password)
我的堆栈跟踪表明，错误来自解密函数，但我无法看到的错误是在函数的n的定义。
File "/Users/Me/anaconda/envs/flask_dream/lib/python2.7/site-packages/sqlalchemy/orm/state.py", line 411, in _initialize_instance
return manager.original_init(*mixed[1:], **kwargs)
File "/Users/Me/anaconda/envs/flask_dream/lib/python2.7/site-packages/sqlalchemy/ext/declarative/base.py", line 650, in _declarative_constructor
setattr(self, k, kwargs[k])
File "/Users/Me/Desktop/Projects/Flask-Dream/project_app/models.py", line 114, in password
cleartext = crypter.decrypt(backend_private_key, encrypted_password)
File "/Users/Me/Desktop/Projects/Flask-Dream/project_app/util/crypto.py", line 121, in decrypt
label=None
File "/Users/Me/anaconda/envs/flask_dream/lib/python2.7/site-packages/cryptography/hazmat/backends/openssl/rsa.py", line 397, in decrypt
raise ValueError("Ciphertext length must be equal to key size.")
你为什么加密密码，因为取决于un使用，这可能是一个非常不安全的做法。 – zaph
这不是我的服务密码，我正在加密（我正在使用哈希+盐）这是另一个用例，我想对我的用户在其个人帐户中输入的数据进行加密。我有一个非常具体的架构。 – mandok
注意：仅使用哈希函数是不够的，仅仅添加盐对提高安全性没有多大作用。相反，用随机盐迭代HMAC约100ms持续时间，然后用散列表保存盐。使用诸如“PBKDF2”（又名'Rfc2898DeriveBytes'），'password_hash' /'password_verify'，'Bcrypt'和类似函数的函数。关键是要让攻击者花费大量时间通过强力查找密码。保护您的用户非常重要，请使用安全的密码方法。 – zaph