python使用rsa库做公钥解密(网上别处找不到)
使用RSA公钥解密,用openssl命令就是openssl rsautl -verify -in cipher_text -inkey public.pem -pubin -out clear_text,但其python网上还真没有找到有博文去写,只有hash的rsa解签名。
这里使用rsa库,如果没有可以到官方网址https://pypi.python.org/pypi/rsa/3.1.4下载。
想了想原理,然后到rsa库的python代码里找了找,从verify的代码里提取了出来,又试验了试验,一切OK了。
代码如下:
#! /usr/bin/env python # -*- coding: utf-8 -*- import sys #rsa from rsa import PublicKey, common, transform, core def f(cipher, PUBLIC_KEY): public_key = PublicKey.load_pkcs1(PUBLIC_KEY) encrypted = transform.bytes2int(cipher) decrypted = core.decrypt_int(encrypted, public_key.e, public_key.n) text = transform.int2bytes(decrypted) if len(text) > 0 and text[0] == '\x01': pos = text.find('\x00') if pos > 0: return text[pos+1:] else: return None fn = sys.stdin.readline()[:-1] public_key = sys.stdin.readline()[:-1] x = f(open(fn).read(), open(public_key).read()) print x
用shell验证如下:
$ openssl genrsa -out pri2048.pem 2048 Generating RSA private key, 2048 bit long modulus ..+++ ..............................................+++ e is 65537 (0x10001) $ openssl rsa -in pri2048.pem -out pub2048.pem -RSAPublicKey_out writing RSA key $ echo -n 'Just a test' >1.txt $ openssl rsautl -sign -in 1.txt -inkey pri2048.pem -out 1.bin $ { echo 1.bin; echo pub2048.pem; } | ./test_rsa.py Just a test
一切OK