我听说当大量名称添加到单个 SAN 证书（主题备用名称）时，性能开始下降。
有人可以解释一下 SAN 证书是如何处理的，以便我理解随着 SAN 上的名称增加，导致性能成本增加的原因是什么吗？
答案1
一些表面的测试确实似乎表明我被灌输了一堆废话。
我像这样生成了证书：
openssl genrsa -out www.domain.tld.key 2048
[kbrandt@alpine: ~/sancrt] openssl req -new -key www.domain.tld.key -out www.domain.tld.csr
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:US
State or Province Name (full name) [Some-State]:NY
Locality Name (eg, city) []:New York
Organization Name (eg, company) [Internet Widgits Pty Ltd]:LOTA-SAN
Organizational Unit Name (eg, section) []:SANSRUS
Common Name (e.g. server FQDN or YOUR name) []:www.domain.tld
Email Address []:[email protected]
....
echo -n "subjectAltName=DNS:www.domain.tld," > www.domain.tld.cnf;for i in {1..2500}; do echo -n "DNS:www$i.domain.tld,"; done >> www.domain.tld.cnf
#manually delete comma at the end of the .cnf
openssl x509 -req -days 365 \
> -in www.domain.tld.csr \
> -signkey www.domain.tld.key \
> -text \
> -extfile www.domain.tld.cnf \
> -out www.domain.tld.crt
Signature ok
subject=/C=US/ST=NY/L=New York/O=LOTA-SAN/OU=SANSRUS/CN=www.domain.tld/[email protected]
Getting Private key
cat *.key *.crt > sillysan.pem
当我尝试 curl 和 wget 时，我没有发现任何明显的差异：
time curl -ssl3 --noproxy \* -D - --insecure http://www2500.domain.tld
curl -ssl3 --noproxy \* -D - --insecure http://www2500.domain.tld 0.01s user 0.00s system 69% cpu 0.012 total
www 与 www2500 的结果相同。我猜 --insecure 可能完全绕过了检查，但现在我要给出一个非常不科学的测试的标准印章：
