openssl many uses

[problem]

1. You want to generate a self-signed certificate?
2. Encrypt a message with triple des
3. View base 64 encoded data
4. Generate and use random data
5. Test ciphers
6. Monitor certificate expiry dates

[/problem]

[solution]

openssl to the rescue! 🙂 See examples.

[/solution]

[example]

1. openssl code to generate self-signed cert
2. encrypt with tripledes
3. openssl base64 [ -d ]
   # encrypted with base64.
4. Useful fortransfering control/binary content – like this:

   dd bs=1 count=512 if=/dev/urandom | openssl base64

   Also useful for reading mail

   openssl base64 -d /var/spool/mqueue/qfk3GAlBMn018552

5. Using openssl s_client to test ciphers supported, with automated script – then loop sites and email.
6. Using openssl s_client to extract expiry dates, with automated script – then loop sites and email.

[/example]

[reference]

[tags]openSSL, dd, UNIX, SSL Certificates, PKI, Encryption, Generate Random Data, Unix Coding School[/tags]

• [ Linux Man Pages – openSSL ]
• [ Linux Man Pages – dd ]

[/reference]

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