How to extract public key from certificate?

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How to extract public key from certificate?

Recently I had to extract the public key from a certificate. Each time I do this I end up looking up the man pages for openssl and so I thought I’d blog it for myself and for others to use when needed.

$ openssl x509 -inform pem -in certificate.pem -pubkey -noout > publickey.pem

Enjoy

Enterprise Software Architect and Developer working at Leidos as a consultant for the Modern Development Environment Group at SSA.gov developing the next generation of DevOps solutions and services. My passions include all things Open Source including Java, Python, GoLang, JavaScript, Linux, Arduino, ARM, Embedded Devices, Web Development and micro controllers. Coming from an Electrical and Computer Engineering background, working in developing and designing enterprise grade distributed, highly scalable software requires a unique set of software skills with a good understanding of the hardware. This makes my work challenging and interesting each and every day. I enjoy spending my free time with my family, friends and our pet dog. I enjoy researching on topics including - world ancient history, yoga, science, biology, chemistry and all things interesting. Visit the ‘About’ section up top for more details.