Extract Public key from Private Key (2024)

This tool will help you to extract the public key in the pem format from the given private key

Related Tool

• PEMReader Decode Certificate
• RSA Signature/Verification
• DSA Keygen,Sign File,Verify Sig
• Elliptic Curve Encryption/Decryption

Openssl Extracting Public key from Private key

RSA

Generate 2048 bit RSA Private/Public key
openssl genrsa -out mykey.pem 2048
To just output the public part of a private key:
openssl rsa -in mykey.pem -pubout -out pubkey.pem

DSA

Generate DSA Paramaters
openssl dsaparam -out dsaparam.pem 2048
From the given Parameter Key Generate the DSA keys
openssl gendsa -out privkey.pem dsaparam.pem
To just output the public part of a private key:
openssl dsa -in privkey.pem -pubout -out pubkey.pem

EC

openssl ecparam -name secp256k1 -out secp256k1.pem
openssl ecparam -in secp256k1.pem -genkey -noout -out privkey.pem
To just output the public part of a private key:
openssl ec -in privkey.pem -pubout -out ecpubkey.pem

Your Support Matters!

Instead of directly asking for donations, I'm thrilled to offer you all nine of my books for just $9 on leanpub By grabbing this bundle you not only help cover my coffee, beer, and Amazon bills but also play a crucial role in advancing and refining this project. Your contribution is indispensable, and I'm genuinely grateful for your involvement in this journey!

Any private key value that you enter or we generate is not stored on this site, this tool is provided via an HTTPS URL to ensure that private keys cannot be stolen, for extra security run this software on your network, no cloud dependency