编写一个程序来测量AES算法在ECB、CBC、CFB、OFB和CTR不同加密模式下的时间开销,具体步骤包括如何设置加密环境、执行加密操作并记录时间,以及如何解析和展示结果。提供一份详细的Python可运行代码。
时间: 2024-11-25 09:10:51 浏览: 25
编写一个Python程序来测量AES算法在不同加密模式下的时间开销,需要使用`cryptography`库,它包含了各种加密模式的支持。以下是详细步骤:
```python
# 首先,安装所需的库 (如果尚未安装)
!pip install cryptography
import time
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
def measure_encrypt_mode(mode, key, plaintext):
backend = default_backend()
cipher = Cipher(algorithms.AES(key), mode(backend), backend=backend)
start_time = time.time()
encryptor = cipher.encryptor()
ciphertext = encryptor.update(plaintext) + encryptor.finalize()
end_time = time.time()
return end_time - start_time, ciphertext
# 设置测试数据
key = bytes.fromhex('000102030405060708090a0b0c0d0e0f') # 16字节随机AES密钥
plaintext = b'This is a test message.'
# 测试加密模式
time_cost_and_ciphertext = {}
for mode in [modes.ECB, modes.CBC, modes.CFB, modes.OFB, modes.CTR]:
name = mode.name.lower().replace('_', '')
time_cost, ciphertext = measure_encrypt_mode(mode, key, plaintext)
time_cost_and_ciphertext[name] = (time_cost, ciphertext)
# 解析和展示结果
print(f"--\n")
for mode, data in time_cost_and_ciphertext.items():
print(f"{mode.capitalize()}: Time taken: {data[0]:.6f} seconds")
# 如果你想查看加密后的明文部分,可以在这里添加
# print(f"Ciphertext: {data[1]}")
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