* CertificateChecker with checks for expiration and key length
* Add validity length check
* Get rid of hard-coded constants and DSA checks
* add files that for some reason weren't included in last commit
* Rename violations and other fixes
* Add displayMessage to CertificateViolation enum
* Switch violations from an enum to a class
* small changes
* Get rid of ECDSA checks
* add checks for old validity length
* Change error message for validity length
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