try:
# RSA仅支持限定长度内的数据的加解密 。需要分块
# 分块大小
reserve_size = self.block_reversed_size
key_size = rsa_key.size_in_bits()
if (key_size % 8) != 0:
raise RuntimeError('RSA 密钥长度非法')
# 密钥用来解密 。解密不需要预留长度
if rsa_key.has_private():
reserve_size = 0
bs = int(key_size / 8) - reserve_size
except Exception as err:
print('计算加解密数据块大小出错', rsa_key, err)
return bs
# 返回块数据
def block_data(self, data, rsa_key):
bs = self.get_block_size(rsa_key)
for i in range(0, len(data), bs):
yield data[i:i + bs]
# 加密
def enc_bytes(self, data, key=None):
text = b''
try:
rsa_key = self.pub_key
if key:
rsa_key = key
cipher = self.ciper_lib.new(rsa_key)
for dat in self.block_data(data, rsa_key):
cur_text = cipher.encrypt(dat)
text += cur_text
except Exception as err:
print('RSA加密失败', data, err)
return text
# 解密
def dec_bytes(self, data, key=None):
text = b''
try:
rsa_key = self.pri_key
if key:
rsa_key = key
cipher = self.ciper_lib.new(rsa_key)
for dat in self.block_data(data, rsa_key):
if type(self.ciper_lib) == Cipher.PKCS1_OAEP:
cur_text = cipher.decrypt(dat)
else:
cur_text = cipher.decrypt(dat, '解密异常')
text += cur_text
except Exception as err:
print('RSA解密失败', data, err)
return text
# RSA签名
def sign_bytes(self, data, key=None):
signature = ''
try:
rsa_key = self.pri_key
if key:
rsa_key = key
h = self.hash_lib.new(data)
signature = self.sign_lib.new(rsa_key).sign(h)
except Exception as err:
print('RSA签名失败', '', err)
return signature
# RSA签名验证
def sign_verify(self, data, sig, key=None):
try:
rsa_key = self.pub_key
if key:
rsa_key = key
h = self.hash_lib.new(data)
self.sign_lib.new(rsa_key).verify(h, sig)
ret = True
except (ValueError, TypeError):
ret = False
return ret
def main():
pass
if __name__ == '__main__':
【Python如何玩转加密？】main()
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