README.md
1About This Directory
2-------------
3This testdata directory contains the certificates used in the tests of package advancedtls.
4
5How to Generate Test Certificates Using OpenSSL
6-------------
7
8Supposing we are going to create a `subject_cert.pem` that is trusted by `ca_cert.pem`, here are the
9commands we run:
10
111. Generate the private key, `ca_key.pem`, and the cert `ca_cert.pem`, for the CA:
12
13 ```
14 $ openssl req -x509 -newkey rsa:4096 -keyout ca_key.pem -out ca_cert.pem -nodes -days $DURATION_DAYS
15 ```
16
172. Generate a private key `subject_key.pem` for the subject:
18
19 ```
20 $ openssl genrsa -out subject_key.pem 4096
21 ```
22
233. Generate a CSR `csr.pem` using `subject_key.pem`:
24
25 ```
26 $ openssl req -new -key subject_key.pem -out csr.pem
27 ```
28 For some cases, we might want to add some extra SAN fields in `subject_cert.pem`.
29 In those cases, we can create a configuration file(for example, localhost-openssl.cnf), and do the following:
30 ```
31 $ openssl req -new -key subject_key.pem -out csr.pem -config $CONFIG_FILE_NAME
32 ```
33
344. Use `ca_key.pem` and `ca_cert.pem` to sign `csr.pem`, and get a certificate, `subject_cert.pem`, for the subject:
35
36 This step requires some additional configuration steps and please check out [this answer from StackOverflow](https://stackoverflow.com/a/21340898) for more.
37
38 ```
39 $ openssl ca -config openssl-ca.cnf -policy signing_policy -extensions signing_req -out subject_cert.pem -in csr.pem -keyfile ca_key.pem -cert ca_cert.pem
40 ```
41 Please see an example configuration template at `openssl-ca.cnf`.
425. Verify the `subject_cert.pem` is trusted by `ca_cert.pem`:
43
44
45 ```
46 $ openssl verify -verbose -CAfile ca_cert.pem subject_cert.pem
47
48 ```