python实现rsa的公钥加密、私钥解密及私钥加密、公钥解密 |
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rsa包中现成的公钥加密、私钥解密代码 import rsa def rsa_encrypt(d_str): # 生成公钥和私钥 pubkey, privkey = rsa.newkeys(1024) # 将字符串进行编码 content = d_str.encode('utf-8') # 公钥加密 crypto = rsa.encrypt(content, pubkey) print ('加密后', crypto) return crypto, privkey def rsa_decrypt(crypto, privkey): # 解密 content = rsa.decrypt(crypto, privkey) # 解码 content = content.decode('utf-8') print ('解密结果', content) if __name__ == '__main__': a = rsa_encrypt('hello word') rsa_decrypt(*a)但没有现成的私钥加密、公钥解密的实现 通过阅读源码，整理出一份简易的实现方式 import rsa from rsa import common, transform, core import os def _pad_for_encryption(message, target_length): max_msglength = target_length - 11 msglength = len(message) if msglength > max_msglength: raise OverflowError( "%i bytes needed for message, but there is only" " space for %i" % (msglength, max_msglength) ) padding = b"" padding_length = target_length - msglength - 3 while len(padding) < padding_length: needed_bytes = padding_length - len(padding) new_padding = os.urandom(needed_bytes + 5) new_padding = new_padding.replace(b"\x00", b"") padding = padding + new_padding[:needed_bytes] assert len(padding) == padding_length return b"".join([b"\x00\x02", padding, b"\x00", message]) def decrypt(data: bytes, d, n): num = transform.bytes2int(data) decrypto = core.decrypt_int(num, d, n) out = transform.int2bytes(decrypto) sep_idx = out.index(b"\x00", 2) out = out[sep_idx + 1 :] return out def encrypt(data: bytes, d, n): keylength = common.byte_size(n) padded = _pad_for_encryption(data, keylength) num = transform.bytes2int(padded) decrypto = core.encrypt_int(num, d, n) out = transform.int2bytes(decrypto) return out if __name__ == '__main__': pubkey, privkey = rsa.newkeys(2048) data = '123456789' data2b = data.encode('utf8') edata = encrypt(data2b, pubkey.e, pubkey.n) ddata = decrypt(edata, privkey.d, privkey.n) ddata = ddata.decode('utf8') assert ddata == data其实上述代码也能实现公钥加密和私钥解密功能，只要改成下面即可 edata = encrypt(data2b, privkey.d, privkey.n) ddata = decrypt(edata, pubkey.e, pubkey.n) |
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