cmd/openssl
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About
openssl is the command-line program for managing SSL data and certificates.
Examples
- To check that a certificate file is valid, and see what it says (does not work with key files) - typical file extensions are .crt, .ca:
- openssl x509 -text -in filename
- To verify how a web server is presenting its certificate over https:
- openssl s_client -connect vbz.net:443
- To generate a new private key:
- openssl genrsa -des3 -out filename.key 4096
- To remove the pass phrase from a private key:
- openssl rsa -in oldfile.key -out newfile.key
- There is slightly more explanation here.
- openssl rsa -in oldfile.key -out newfile.key
Notes
- openssl verify [1] seems to be the tool of choice for checking certificate files stored locally.
- This also has some useful information about using openssl, and a little bit about the "chaining" concept.