openssl dgst -sha1 -mac HMAC -macopt hexkey:aabbcc
学习ipsec的esp的认证时可用
http://openssl.6102.n7.nabble.com/command-line-hmac-with-key-in-hex-td6754.html
openssl
原文：http://www.cnblogs.com/itzxy/p/6880872.html
