python密码学库pynacl功能介绍
目录
- python库-密码学库pynacl
- 什么是pynacl
- 数字签名使用example
python库-密码学库pynacl
什么是pynacl
官方: https://pynacl.readthedocs.io/en/latest/
PyNaCl is a Python binding to libsodium, which is a fork of the Networking and Cryptography library. These libraries have a stated goal of improving usability, security and speed. It supports Python 3.6+ as well as PyPy 3.
PyNaCl 是 libsodium C库绑定封装。PyNaCl是libsodium库的Python实现。libsodium是一个基于NaCI开发的先进而且易用的加密库,主要用于加密、解密、签名和生成密码哈希等。PyNaCI能够提供数字签名、密钥加密、公钥加密、哈希和消息身份验证、基于密码的密钥派生和密码散列功能。
libsodium 是c写的,现代,便携式,易于使用的加密库。Sodium是一个新的,易于使用的软件库,用于加密,解密,签名,密码哈希等。
官网:libsodium.org
github: https://github.com/jedisct1/libsodium
PyNaCl功能:
- Digital signatures
- Secret-key encryption
- Public-key encryption
- Hashing and message authentication
- Password based key derivation and password hashing
数字签名使用example
官方:https://pynacl.readthedocs.io/en/latest/signing/
数字签名允许您公布公共密钥,然后您可以使用私有签名密钥来签名消息。然后,拥有您的公钥的其他人可以使用它来验证您的消息实际上是真实的。
签名和验证消息而无需编码密钥或消息:
签名 (SigningKey):
from nacl.encoding import Base64Encoder from nacl.signing import SigningKey # Generate a new random signing key signing_key = SigningKey.generate() # Sign a message with the signing key signed_b64 = signing_key.sign(b"Attack at Dawn", encoder=Base64Encoder) # Obtain the verify key for a given signing key verify_key = signing_key.verify_key # Serialize the verify key to send it to a third party verify_key_b64 = verify_key.encode(encoder=Base64Encoder)
验签 (VerifyKey):
from nacl.encoding import Base64Encoder from nacl.signing import VerifyKey # Create a VerifyKey object from a base64 serialized public key verify_key = VerifyKey(verify_key_b64, encoder=Base64Encoder) # Check the validity of a message's signature # The message and the signature can either be passed together, or # separately if the signature is decoded to raw bytes. # These are equivalent: verify_key.verify(signed_b64, encoder=Base64Encoder) signature_bytes = Base64Encoder.decode(signed_b64.signature) verify_key.verify(signed_b64.message, signature_bytes, encoder=Base64Encoder) # Alter the signed message text forged = signed_b64[:-1] + bytes([int(signed_b64[-1]) ^ 1]) # Will raise nacl.exceptions.BadSignatureError, since the signature check # is failing verify_key.verify(forged)
Traceback (most recent call last): ... nacl.exceptions.BadSignatureError: Signature was forged or corrupt
classnacl.signing.SigningKey(seed, encoder)[source]¶
使用ED25519算法生产数字签名的私钥。
签名密钥是由32字节(256位)随机种子值产生的。该值可以以32的长度为bytes()传递到签名密钥中。
参数:
seed (bytes) – Random 32-byte value (i.e. private key).
encoder – A class that is able to decode the seed.
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