python庫-密碼學(xué)庫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庫綁定封裝。PyNaCl是libsodium庫的Python實現(xiàn)。libsodium是一個基于NaCI開發(fā)的先進(jìn)而且易用的加密庫，主要用于加密、解密、簽名和生成密碼哈希等。PyNaCI能夠提供數(shù)字簽名、密鑰加密、公鑰加密、哈希和消息身份驗證、基于密碼的密鑰派生和密碼散列功能。

libsodium 是c寫的，現(xiàn)代，便攜式，易于使用的加密庫。Sodium是一個新的，易于使用的軟件庫，用于加密，解密，簽名，密碼哈希等。
官網(wǎng)：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

數(shù)字簽名使用example

官方：https://pynacl.readthedocs.io/en/latest/signing/

數(shù)字簽名允許您公布公共密鑰，然后您可以使用私有簽名密鑰來簽名消息。然后，擁有您的公鑰的其他人可以使用它來驗證您的消息實際上是真實的。

簽名和驗證消息而無需編碼密鑰或消息：

簽名 (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)

驗簽 (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算法生產(chǎn)數(shù)字簽名的私鑰。

簽名密鑰是由32字節(jié)（256位）隨機(jī)種子值產(chǎn)生的。該值可以以32的長度為bytes()傳遞到簽名密鑰中。

參數(shù)：
seed (bytes) – Random 32-byte value (i.e. private key).
encoder – A class that is able to decode the seed.文章來源地址http://www.zghlxwxcb.cn/news/detail-409018.html

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