Openssl dgst命令

一、简介

消息摘要可以对任意长度的消息产生固定长度（16或20个字节）的信息摘要，理论基于单向HASH函数，根据消息摘要无法恢复出原文，所以是安全的；消息原文和消息摘要是一一对应的，所以又被称作指纹。

二、语法

openssl dgst[-md5|-md4|-md2|-sha1|-sha|-mdc2|-ripemd160|-dss1] [-c] [-d] [-hex] [-binary] [-out filename] [-sign filename] [-keyform arg] [-passin arg] [-verify filename] [-prverify filename] [-signature filename] [-hmac key] [file...]

选项

-c              to output the digest with separating colons
-r              to output the digest in coreutils format
-d              to output debug info
-hex            output as hex dump
-binary         output in binary form
-sign   file    sign digest using private key in file
-verify file    verify a signature using public key in file
-prverify file  verify a signature using private key in file
-keyform arg    key file format (PEM or ENGINE)
-out filename   output to filename rather than stdout
-signature file signature to verify
-sigopt nm:v    signature parameter
-hmac key       create hashed MAC with key
-mac algorithm  create MAC (not neccessarily HMAC)
-macopt nm:v    MAC algorithm parameters or key
-engine e       use engine e, possibly a hardware device.
-md4            to use the md4 message digest algorithm
-md5            to use the md5 message digest algorithm
-ripemd160      to use the ripemd160 message digest algorithm
-sha            to use the sha message digest algorithm
-sha1           to use the sha1 message digest algorithm
-sha224         to use the sha224 message digest algorithm
-sha256         to use the sha256 message digest algorithm
-sha384         to use the sha384 message digest algorithm
-sha512         to use the sha512 message digest algorithm
-whirlpool      to use the whirlpool message digest algorithm

三、实例

1、对文件进行消息摘要

openssl dgst -md5 test.txt

2、用私钥对消息摘要进行签名，并用公钥进行验签

openssl dgst -md5 -sign prikey.pem -out sign.binary test.txt     
openssl dgst -md5 -verify pubkey.pem -signature sign.binary test.txt

3、消息认证码

openssl dgst -md5 -hmac "123456" test.txt

参考：http://blog.csdn.net/fym0121/article/details/7982620