How to save public key from a certificate in pem format

Question

I am using the below openssl command for storing my public key into a  pem file   openssl gt  x509 -in E  mycert pem -pubkey  -out E  mypubkey pem   But when i try to use this command  it is storing the whole certificate info in the mypubkey pem file   I have seen that i can save my public key using  openssl gt  x509 -pubkey -noout -in cert pem  gt  pubkey pem   But it is throwing an error  I can t use     operator

User · Answer

if it is a RSA key  openssl rsa  -pubout -in my rsa key pem   if you need it in a format for openssh   please see Use RSA private key to generate public key   Note that public key is generated from the private key and ssh uses the identity file  private key file  to generate and send public key to server and un-encrypt the encrypted token from the server via the private key in identity file

User · Answer

There are a couple ways to do this   First  instead of going into openssl command prompt mode  just enter everything on one command line from the Windows prompt   E   gt  openssl x509 -pubkey -noout -in cert pem   gt  pubkey pem   If for some reason  you have to use the openssl command prompt  just enter everything up to the       Then OpenSSL will print out the public key info to the screen   You can then copy this and paste it into a file called pubkey pem   openssl gt  x509 -pubkey -noout -in cert pem   Output will look something like this   -----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAryQICCl6NZ5gDKrnSztO 3Hy8PEUcuyvg ikC VcIo2SFFSf18a3IMYldIugqqqZCs4 4uVW3sbdLs 6PfgdX 7O9D22ZiFWHPYA2k2N744MNiCD1UE tJyllUhSblK48bn v1oZHCM0nYQ2NqUkvS j hwUU3RiWl7x3D2s9wSdNt7XUtW05a FXehsPSiJfKvHJJnGOX0BgTvkLnkAOTd OrUZ wK69Dzu4IvrN4vs9Nes8vbwPa ddZEzGR0cQMt0JBkhk9kU qwqUseP1QRJ 5I1jR4g8aYPL ke9K35PxZWuDp3U0UPAZ3PjFAh 5T fc7gzCs9dPzSHloruU gl FQIDAQAB -----END PUBLIC KEY-----

[openssl] How to save public key from a certificate in .pem format

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