tldr/pages/common/openssl.md

openssl

OpenSSL is a cryptography toolkit.

• Check an SSL connection:

openssl s_client -connect {{domain}}:{{port}}

• Generate new private key and CSR:

openssl req -out {{path/to/CSR.csr}} -new -newkey rsa:2048 -nodes -keyout {{path/to/pivate.key}}

• Read contents of a certificate:

openssl x509 -text -noout -in {{path/to/certificate.crt}}

• Read contents of a private key:

openssl rsa -check -in {{path/to/pivate.key}}

• Verify a CSR file:

openssl req -text -noout -verify -in {{path/to/CSR.csr}}

• Check MD5 hash of a certificate:

openssl x509 -noout -modulus -in {{path/to/certificate.crt}} | openssl md5

• Check MD5 hash of a private key:

openssl rsa -noout -modulus -in {{path/to/pivate.key}} | openssl md5

• Check MD5 hash of a CSR file:

openssl req -noout -modulus -in {{path/to/CSR.csr}} | openssl md5