> For the complete documentation index, see [llms.txt](https://web.mrw0l05zyn.cl/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://web.mrw0l05zyn.cl/reconocimiento-y-recoleccion-de-informacion/certificados.md).
# Certificados
## Obtener certificado
```sh
# Descargar certificado
openssl s_client -connect example.com:443 | openssl x509 > example.pem
## Convertir de PEM a DER
openssl x509 -outform der -in example.pem -out example.der
## Convertir de PEM a PKCS#7
openssl crl2pkcs7 -nocrl -certfile example.pem -out example.p7
```
## Generar certificado autofirmado
```sh
openssl req -x509 -newkey rsa:4096 -keyout key.pem -out example.pem -sha256 -days 365
```
## crt.sh
*
```sh
curl -s "https://crt.sh/?q=&output=json" | jq -r '.[] | "\(.name_value)\n\(.common_name)"' | sort -u
```
* \ = nombre de dominio.
## Censys
*
---
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