实现ANSI X 9.17的伪随机数产生器 （1）代码实现ANSI X 9.17的伪随机数产生器。 （2）代码实现三重DES加密。

以下是实现ANSI X9.17的伪随机数产生器和三重DES加密的代码示例：

1. 实现ANSI X9.17的伪随机数产生器：

import hashlib

def ANSI_X9_17_PRNG(seed, num_bytes):
    output = b""
    while len(output) < num_bytes:
        seed = hashlib.sha256(seed).digest()
        output += seed
    return output[:num_bytes]

# 示例用法
seed = b"1234567890"
num_bytes = 16
random_bytes = ANSI_X9_17_PRNG(seed, num_bytes)
print("Random bytes:", random_bytes.hex())

2. 实现三重DES加密：

from Crypto.Cipher import DES3
from Crypto.Random import get_random_bytes

def triple_des_encrypt(plaintext, key):
    cipher = DES3.new(key, DES3.MODE_ECB)
    ciphertext = cipher.encrypt(plaintext)
    return ciphertext

def triple_des_decrypt(ciphertext, key):
    cipher = DES3.new(key, DES3.MODE_ECB)
    plaintext = cipher.decrypt(ciphertext)
    return plaintext

# 示例用法
plaintext = b"Hello, world!"
key = get_random_bytes(24)
ciphertext = triple_des_encrypt(plaintext, key)
decrypted_text = triple_des_decrypt(ciphertext, key)
print("Ciphertext:", ciphertext.hex())
print("Decrypted text:", decrypted_text.decode())