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)：
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from nacl.encoding import Base64Encoderfrom nacl.signing import SigningKey# Generate a new random signing keysigning_key = SigningKey.generate()# Sign a message with the signing keysigned_b64 = signing_key.sign(b"Attack at Dawn", encoder=Base64Encoder)# Obtain the verify key for a given signing keyverify_key = signing_key.verify_key# Serialize the verify key to send it to a third partyverify_key_b64 = verify_key.encode(encoder=Base64Encoder) |
验签 (VerifyKey)：
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from nacl.encoding import Base64Encoderfrom nacl.signing import VerifyKey# Create a VerifyKey object from a base64 serialized public keyverify_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 textforged = signed_b64[:-1] + bytes([int(signed_b64[-1]) ^ 1])# Will raise nacl.exceptions.BadSignatureError, since the signature check# is failingverify_key.verify(forged) |
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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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原文链接：https://blog.csdn.net/inthat/article/details/124550307
