certigo - A utility to examine and validate certificates in a variety of formats

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Certigo is a utility to examine and validate certificates to help with debugging SSL/TLS issues.Supports all common file formats: Certigo can read and dump certificates in various formats. It can automatically detect and read from X.509 (DER/PEM), JCEKS, PKCS7 and PKCS12 files. Certificates can be dumped to a human-readable format, a set of PEM blocks, or a JSON object for use in scripting.

https://github.com/square/certigo

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