OpenSSL：如何创建具有空主题的证书？

我需要生成主题字段为空的证书。 我已尝试使用配置：

[ req ]
default_bits                            = 1024                  # Size of keys
default_md                              = md5                           
algorithm
string_mask                             = nombstr               # permitted characters
#string_mask                            = pkix          # permitted characters
distinguished_name                      = req_distinguished_name
req_extensions                          = v3_req

[ policy_match ]
commonName              = optional
countryName             = optional
emailAddress            = optional

[ req_distinguished_name ]
# Variable name                         Prompt string
#-------------------------        ----------------------------------
0.organizationName                      = Organization Name (company)
organizationalUnitName                  = Organizational Unit Name (division)
localityName                            = Locality Name (city, district)
stateOrProvinceName                     = State or Province Name (full name)
countryName                             = Country Name (2 letter code)
commonName                              = Common Name (hostname, IP, or your name)
0.organizationName_default              = 
localityName_default                    = 
stateOrProvinceName_default             = 
countryName_default                     = 
emailAddress_default                    = 

[ v3_req ]
basicConstraints                        = CA:FALSE
subjectKeyIdentifier                    = hash
subjectAltName                          = critical,DNS:example3.com

但是得到：

Organization Name (company) []:
Organizational Unit Name (department, division) []:
Locality Name (city, district) []:
State or Province Name (full name) []:
Country Name (2 letter code) []:
Common Name (hostname, IP, or your name) []:
error, no objects specified in config file
problems making Certificate Request

我在这里发现了同样的问题：

但没有解决办法。当我键入just enter（空字段）时，出现以下错误： 错误，配置文件中未指定任何对象

你能帮忙吗？如何生成主题名称为空的CSR

---

谢谢

我发现，如果我为至少一个提示输入了内容，我没有收到错误，csr文件被创建

Country Name (2 letter code) []:US                        <-- only entered this
State or Province Name (full name) []:
Locality Name (eg, city) []:
Organization Name (eg, company) []:
Organizational Unit Name (eg, section) []: 
Common Name (eg, fully qualified host name) []:
Email Address []:

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:

国家名称（两个字母代码）[]：美国