Wonderstacked

Security

Certificate Key Matcher

The Certificate Key Matcher derives and compares public keys from a certificate and private key to verify that they belong together locally. It gives an immediate, focused result with no signup, explains the important limits beside the output, and keeps the workflow as private as the implementation allows.

Last updated · Free, no signup

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How can a certificate be matched to a private key?

A certificate and private key match when the public key derived from the private key is identical to the public key embedded in the certificate. Comparing those values detects a common deployment failure in which a valid certificate is installed beside the wrong key.

Node-forge derives and compares the keys locally, so private-key material is not uploaded. A positive match proves only that the pair corresponds; it says nothing about certificate trust, hostname coverage, expiry, revocation, chain completeness, permissions, or whether the private key has already been exposed.