windows下使用openssl生成证书
一：下载
使用的是0.9.8
1：openssl下载，http://www.openssl.org/source/
2：安装vs2010，并安装
3：下载perl，http://www.activestate.com/ActivePerl，并安装。
二：安装openssl
1：解压到系统盘C:\openssl-0.9.8v
2、配置WIN32环境
打开CMD命令行，进入C:\openssl-0.9.8v目录，执行命令
perl Configure VC-WIN32
注意区分大小写
3、进入VC BIN目录，配置VC环境变量
进入VS安装路径VC/Bin目录下，运行：
VCVARS32.BAT
设置环境变量。
4、返回OpenSSL目录，创建makefile文件
ms\do_ms
该命令不执行汇编语言编译，如报告文末错误，可以尝试ms\do_masm（使用汇编语言）、ms\do_nasm、ms\do_nt等，这几个配置文件是针对不同的系统配置写的批处理。
5、在Openssl目录下，执行编译
nmake -f ms\ntdll.mak
最终编译动态库完成后，输出都在out32dll目录下：包括可执行文件、两个dll 和两个lib文件: libeay32.dll, libeay32.lib, ssleay32.dll, ssleay32.lib，如果使用VS/VC编程只需按照下文的方法进行即可，如果需要使用openssl命令，还需要在系统环境变量path中增加C:\openssl-0.9.8v\out32dll路径，因为openssl.exe就在该目录下，声明后可以直接在命令行中使用openssl命令。
三：生成证书
1、添加配置文件（openssl.cnf）的环境变量：OPENSSL_CONF。配置文件可从OpenSSL解压后根目录下的apps目录下拷贝，再自行修改配置。也可以在openssl命令中用-config指定配置文件的位置。
我的配置文件：
#
# SSLeay example properties file.
# This is mostly being used for generation of certificate requests.
#
RANDFILE = .rnd
####################################################################
[ ca ]
default_ca = CA_default # The default ca section
####################################################################
[ CA_default ]
dir = C:\\CA # Where everything is kept
certs = $dir\\certs # Where the issued certs are kept
crl_dir = $dir\\crl # Where the issued crl are kept
database = $dir\\index.txt # database index file.
new_certs_dir = $dir\\newcerts # default place for new certs.
certificate = $dir\\cacert.pem # The CA certificate
serial = $dir\\serial # The current serial number
crl = $dir\\crl.pem # The current CRL
private_key = $dir\\private\\cakey.pem # The private key
RANDFILE = $dir\\private\\private.rnd # private random number file
x509_extensions = x509v3_extensions # The extentions to add to the cert
default_days = 365 # how long to certify for
default_crl_days = 30 # how long before next CRL
default_md = md5 # which md to use.
preserve = no # keep passed DN ordering
# A few difference way of specifying how similar the request should look
# For type CA, the listed attributes must be the same, and the optional
# and supplied fields are just that :-)
policy = policy_match
# For the CA policy
[ policy_match ]
countryName = match
stateOrProvinceName = match
organizationName = match
organizationalUnitName = optional
commonName = supplied
emailAddress = optional
# For the ’anything’ policy
# At this point in time, you must list all acceptable ’object’
# types.
[ policy_anything ]
countryName = optional
stateOrProvinceName = optional
localityName = optional
organizationName = optional
organizationalUnitName = optional
commonName = supplied
emailAddress = optional
####################################################################
[ req ]
default_bits = 1024
default_keyfile = privkey.pem
distinguished_name = req_distinguished_name
attributes = req_attributes
[ req_distinguished_name ]
countryName = Country Name (2 letter code)
countryName_min = 2
countryName_max = 2
stateOrProvinceName = State or Province Name (full name)
localityName = Locality Name (eg, city)
0.organizationName = Organization Name (eg, company)
organizationalUnitName = Organizational Unit Name (eg, section)
commonName = Common Name (eg, your website’s domain name)
commonName_max = 64
emailAddress = Email Address
emailAddress_max = 40
[ req_attributes ]
challengePassword = A challenge password
challengePassword_min = 4
challengePassword_max = 20
[ x509v3_extensions ]
<完>
$dir下建立一系列目录和文件：
现在可以使用openssl命令来生成证书了：
1.首先要生成服务器端的私钥(key文件):
opensslgenrsa-des3-outserver.key1024
运行时会提示输入密码,此密码用于加密key文件(参数des3便是指加密算法,当然也可以选用其他你认为安全的算法.),以后每当需读取此文件(通过openssl提供的命令或API)都需输入口令.如果觉得不方便,也可以去除这个口令,但一定要采取其他的保护措施!
去除key文件口令的命令:
opensslrsa-inserver.key-outserver.key
2.opensslreq-new-keyserver.key-outserver.csr-configopenssl.cnf
生成CertificateSigningRequest（CSR）,生成的csr文件交给CA签名后形成服务端自己的证书.屏幕上将有提示,依照其指示一步一步输入要求的个人信息即可.
3.对客户端也作同样的命令生成key及csr文件:
opensslgenrsa-des3-outclient.key1024
opensslreq-new-keyclient.key-outclient.csr-configopenssl.cnf
4.CSR文件必须有CA的签名才可形成证书.可将此文件发送到verisign等地方由它验证,要交一大笔钱.自己做CA.
opensslreq-new-x509-keyoutca.key-outca.crt-configopenssl.cnf
5.用生成的CA的证书为刚才生成的server.csr,client.csr文件签名:
Opensslca-inserver.csr-outserver.crt-certca.crt-keyfileca.key-configopenssl.cnf
Opensslca-inclient.csr-outclient.crt-certca.crt-keyfileca.key-configopenssl.cnf
client使用的文件有：ca.crt,client.crt,client.key
server使用的文件有：ca.crt,server.crt,server.key
.crt文件和.key可以合到一个文件里面，本人把2个文件合成了一个.pem文件（直接拷贝过去就行了）
openssl req 命令参数：
openssl req[-inform PEM|DER] [-outform PEM|DER] [-in filename] [-passin arg] [-out filename] [-passout arg] [-text] [-pubkey] [-noout] [-verify] [-modulus] [-new] [-rand file(s)] [-newkey rsa:bits] [-newkey alg:file] [-nodes] [-key filename] [-keyform PEM|DER] [-keyout filename] [-keygen_engine id] [-[digest]] [-config filename] [-subj arg] [-multivalue-rdn] [-x509] [-days n] [-set_serial n] [-asn1-kludge] [-no-asn1-kludge] [-newhdr] [-extensions section] [-reqexts section] [-utf8] [-nameopt] [-reqopt] [-subject] [-subj arg] [-batch] [-verbose] [-engine id]
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