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52

Extract public key from private key pem using only nodejs/javascript

rated 0 times [ 59] [ 7] / answers: 1 / hits: 15637 / 9 Years ago, fri, february 27, 2015, 12:00:00

Using nodejs and only javascript, how do I extract a public key from a private key pem?

The private key that I have in hand is a PEM formatted private key; I'd like to extract the public key so I can distribute it to collaborators.

I regularly use the pure javascript node-forge module but have not yet discovered how to extract the public key from the private key.

I am also aware of, and presently use the ursa module to accomplish this; but I would like a pure javascript or pure nodejs solution if available.

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citlalia

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2 Years ago

answered 9 Years ago stefanicarolinat · Accepted Answer

from the node-forge documentation

pem = '-----PRIVATE KEY ----- [...]'

pki = require('node-forge').pki

privateKey = pki.privateKeyFromPem(pem)

publicKey  = pki.setRsaPublicKey(privateKey.n, privateKey.e)

console.log(pki.publicKeyToPem(publicKey))