Create and check certificates
=============================

Published  : 1 January 2025
Reading    : 1 min
Tags       : Security
URL        : https://ctrl-find.nl/posts/certificates/
Plain text : https://ctrl-find.nl/posts/certificates/index.txt

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## Linux/MacOS OpenSSL

#### MD5 modules

You can use MD5 module to check if key and cert are a keypair toghter.

```bash
openssl rsa -modulus -noout -in <name>.key| openssl md5
openssl x509 -modulus -noout -in <name>.crt| openssl md5
```

#### Check cert

```bash
openssl x509 -in <name>.crt -text -noout
```

#### Check CSR

```bash
openssl req -in <name>.csr -noout -text
```

#### Short monitoring

```bash
openssl x509 -in <path>/<name>.crt -noout -checkend 3888000
```


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