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非对称加密，私钥加密，公钥解密 ， （公钥互换）[数字签名]
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对称加密 （凯撒[Char to Int 位移]，DES加密[密钥为8位]，AES加密[密钥为16位，相对更安全，速度慢]）
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消息（MD5,SHA1,SHA256），不可逆 [MessageDigestUtil提供相关api]
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数字签名[SignatureUtil 提供相关api]
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实现https服务配置，自处理证书[服务器为NodeJs]
Copyright (c) 2019 anyrsan
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
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distributed under the License is distributed on an "AS IS" BASIS,
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See the License for the specific language governing permissions and
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