哈希数据编码解码实现（Hash） 需安全openssl等安全证书-Hash data codec implementation (Hash) need to secure safety certificate openssl, etc.

Canged to use byte arrays instead of UnicodeString.hashCode: minimum inc should be 2 not 1,.Cleaned up operator.

写的一些常用加解密函数，比如Base64加密与解密，网址转码与解码，MD5加密，HMAC－MD5加密，UTF－8编码与解码等，代码极度优化。-Write some commonly used encryption and decryption functions, such as Base64 encryption and decryption at transcoding and decoding, MD5 encryption, HMAC-MD5 encryption, UTF-8 enco