rsa-crt算法超高效率很高级的py语言实现完整代码
时间: 2023-09-16 17:05:29 浏览: 115
### 回答1:
下面是 RSA-CRT 算法的 Python 实现。这是一种高效的 RSA 加密算法,它通过使用 Chinese Remainder Theorem(CRT)来加速加密和解密过程。
首先,我们需要安装并导入一些必要的库:
```python
pip install gmpy2
pip install pycryptodome
from Crypto.Util.number import *
from gmpy2 import *
```
接下来,我们需要定义一些常量和函数:
```python
# RSA 加密常量
N = 162259276829213363391578010288127
E = 65537
D = 14736871905452358333597505022289
P = 41743566575379435793703790844127
Q = 39095027402394542986568936640305
# 计算模 n 意义下的逆元
def invmod(a, n):
return invert(a, n)
# 计算 (a ** b) % mod
def modpow(a, b, mod):
return powmod(a, b, mod)
# 计算 CRT 合并后的数
def crt_combine(a_list, n_list):
return crt(a_list, n_list)
```
有了这些函数和常量,我们就可以开始实现 RSA-CRT 算法了。
首先是加密函数:
```python
def rsa_crt_encrypt(m):
# 先将明文转换成整数
m = bytes_to_long(m.encode())
# 计算 CRT 分解后的数
mp = m % P
mq = m % Q
# 对分解后的数进行加密
c1 = modpow(mp, E, P)
c2 = modpow(mq, E, Q)
# 将加密后的数合并起来
c = crt_combine([c1, c2], [P, Q])
# 返回密文
return long_to_bytes(c)
```
接着是解密函数:
### 回答2:
RSA-CRT(RSA Chinese Remainder Theorem)算法是一种RSA算法的优化技术,用于提高RSA算法的执行效率。下面是一个使用Python语言完整实现的高效率RSA-CRT算法的代码示例:
```python
import random
def gcd(a, b):
if b == 0:
return a
return gcd(b, a % b)
def extended_gcd(a, b):
if b == 0:
return a, 1, 0
else:
d, x, y = extended_gcd(b, a % b)
return d, y, x - (a // b) * y
def modular_inverse(a, n):
d, x, y = extended_gcd(a, n)
if d == 1:
return x % n
return None
def rsa_crt_encrypt(plaintext, e, p, q):
n = p * q
phi_n = (p - 1) * (q - 1)
if gcd(e, phi_n) != 1:
raise ValueError("e and phi(n) are not coprime.")
d = modular_inverse(e, phi_n)
if d is None:
raise ValueError("No modular inverse for e and phi(n).")
dp = d % (p - 1)
dq = d % (q - 1)
qinv = modular_inverse(q, p)
m1 = pow(plaintext, dp, p)
m2 = pow(plaintext, dq, q)
h = (qinv * (m1 - m2)) % p
ciphertext = m2 + h * q
return ciphertext
def rsa_crt_decrypt(ciphertext, e, p, q):
n = p * q
phi_n = (p - 1) * (q - 1)
if gcd(e, phi_n) != 1:
raise ValueError("e and phi(n) are not coprime.")
d = modular_inverse(e, phi_n)
if d is None:
raise ValueError("No modular inverse for e and phi(n).")
dp = d % (p - 1)
dq = d % (q - 1)
qinv = modular_inverse(q, p)
h = pow(ciphertext % p, dp, p) - pow(ciphertext % q, dq, q)
h = (h * qinv) % p
plaintext = (ciphertext - h * q) % n
return plaintext
# 测试代码
plaintext = random.randint(0, 100)
e = 65537
p = 61
q = 53
print("明文:", plaintext)
ciphertext = rsa_crt_encrypt(plaintext, e, p, q)
print("密文:", ciphertext)
decrypted_plaintext = rsa_crt_decrypt(ciphertext, e, p, q)
print("解密后的明文:", decrypted_plaintext)
```
此代码实现了RSA-CRT算法的加密和解密过程,包括通过扩展欧几里得算法求模反元素、生成加密和解密密钥、加密和解密的过程。通过对p和q的模重建,RSA-CRT算法能够提高加密和解密的效率。
### 回答3:
RSA-CRT算法是基于RSA算法的一种优化算法。它利用中国余数定理来提高加密和解密的效率。以下是一个高效实现RSA-CRT算法的Python代码示例:
```python
import math
# 扩展欧几里得算法求模反元素
def extended_gcd(a, b):
if b == 0:
return 1, 0, a
else:
x, y, gcd = extended_gcd(b, a % b)
return y, x - (a // b) * y, gcd
# 计算模反元素
def mod_inverse(e, phi):
x, _, _ = extended_gcd(e, phi)
return x % phi
# 快速模幂运算
def mod_exp(base, exponent, modulus):
result = 1
while exponent > 0:
if exponent % 2 == 1:
result = (result * base) % modulus
base = (base * base) % modulus
exponent = exponent // 2
return result
# RSA-CRT加密
def rsa_crt_encrypt(plain_text, e, n, p, q, dp, dq, qinv):
m1 = mod_exp(plain_text, dp, p)
m2 = mod_exp(plain_text, dq, q)
h = (qinv * (m1 - m2)) % p
ciphertext = m2 + h * q
return mod_exp(ciphertext, e, n)
# RSA-CRT解密
def rsa_crt_decrypt(ciphertext, d, n, p, q, dp, dq, qinv):
m1 = mod_exp(ciphertext, dp, p)
m2 = mod_exp(ciphertext, dq, q)
h = (qinv * (m1 - m2)) % p
plain_text = m2 + h * q
return mod_exp(plain_text, d, n)
# 测试
if __name__ == '__main__':
p = 137
q = 139
n = p * q
phi = (p - 1) * (q - 1)
e = 65537
d = mod_inverse(e, phi)
dp = d % (p - 1)
dq = d % (q - 1)
qinv = mod_inverse(q, p)
plain_text = 123456
ciphertext = rsa_crt_encrypt(plain_text, e, n, p, q, dp, dq, qinv)
decrypted_text = rsa_crt_decrypt(ciphertext, d, n, p, q, dp, dq, qinv)
print('加密前:', plain_text)
print('加密后:', ciphertext)
print('解密后:', decrypted_text)
```
以上是用Python实现RSA-CRT算法的完整代码。这个代码实现了RSA-CRT的加密和解密过程,并且包含了模幂算法和扩展欧几里得算法的实现。通过利用中国余数定理和模反元素的计算,RSA-CRT算法可以提高加密和解密的效率。