Python实现ecc解密

在Python中，实现ECC（Elliptic Curve Cryptography，椭圆曲线密码学）加密和解密通常涉及使用像`cryptography`这样的库，它提供了对各种加密算法的支持，包括一些基于ECC的算法。以下是使用`cryptography.hazmat.primitives.asymmetric.ec`模块进行ECC密钥对生成、加密和解密的一个简要示例：

from cryptography.hazmat.primitives import ec, hashes
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC

# 引入必要的密钥交换算法
from cryptography.hazmat.primitives.asymmetric import ecdh

def generate_ecc_key_pair(password):
    # 使用PBKDF2从密码获取安全的随机数
    kdf = PBKDF2HMAC(
        algorithm=hashes.SHA256(),
        length=ec.EllipticCurvePublicNumbers.key_size,
        salt=b'salt',
        iterations=100000,
    )
    key_material = kdf.derive(password.encode('utf-8'))

    # 创建公钥和私钥
    private_key = ec.generate_private_key(ec.SECP256R1())
    public_key = private_key.public_key()

    return private_key, public_key

def ecc_encrypt(message, recipient_public_key):
    shared_secret = ecdh.ECDH(private_key=recipient_public_key).derive(shared_key)
    ciphertext = public_key.encrypt(
        message,
        padding.OAEP(
            mgf=padding.MGF1(algorithm=hashes.SHA256()),
            algorithm=hashes.SHA256(),
            label=None
        )
    )
    return ciphertext

def ecc_decrypt(ciphertext, sender_private_key):
    shared_secret = ecdh.ECDH(private_key=sender_private_key).derive(shared_secret)
    plaintext = ciphertext.decrypt(
        sender_private_key,
        padding.OAEP(
            mgf=padding.MGF1(algorithm=hashes.SHA256()),
            algorithm=hashes.SHA256(),
            label=None
        )
    )
    return plaintext.decode()  # 如果需要的话，可以在这里转回字符串

# 示例
password = b"secretpassword"
private_key, public_key = generate_ecc_key_pair(password)

message = "Hello, this is a test message."
encrypted_message = ecc_encrypt(message, public_key)
decrypted_message = ecc_decrypt(encrypted_message, private_key)

print(f"Original Message: {message}")
print(f"Encrypted: {encrypted_message.hex()}")
print(f"Decrypted: {decrypted_message}")