openssl测试签名能力
openssl指令说明
备注：
OpenSSL 1.0.2d 9 Jul 2015
Standard commands
asn1parse ca ciphers cms
crl crl2pkcs7 dgst dh
dhparam dsa dsaparam ec
ecparam enc engine errstr
gendh gendsa genpkey genrsa
nseq ocsp passwd pkcs12
pkcs7 pkcs8 pkey pkeyparam
pkeyutl prime rand req
rsa rsautl s_client s_server
s_time sess_id smime speed
spkac srp ts verify
version x509
Message Digest commands