OpenSSL "x509 -pubkey" - Export Public Key"

Q

How to export the public key out from a certificate using OpenSSL "x509" command?

✍: FYIcenter.com

A

You can export the public key out from a certificate using OpenSSL "x509 -pubkey" command as shown below:

C:\Users\fyicenter>\local\OpenSSL\openssl

OpenSSL> x509 -in twitter.crt -pubkey -noout > twitter_pub.key

OpenSSL> exit

C:\Users\fyicenter>type twitter_pub.key
-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwgiY+mcABVW2C2EOGte1
isHMA748F/uU99n6TJ9GYJxqrX065TRaErCyC6rsluFYgS+tYKtHk2njhHVTwfkP
uUarnuqrGJiMaFQIUWVDGmGXJ1xeDxXpzRar3VFbdi/80xGZndKmPYcCdeYkluIE
PhSc+n64cUI3ALWwiuIzlYvaP/tjTTdi1RwC6jB+3A1T1dQLuKMQE20fiZQLapRE
ZymCrebVsFL8lVcG1tEiZoTTkioCx5RW31U/whPyfBZ4M6FT93eXXLeWBdVE9L/v
gyJdeuaP5KzfNJ62DwpT8BrbcTdpkvYUqRx1ZXJFJAk7LGrXuWml3N9tnGv8xqJb
MQIDAQAB
-----END PUBLIC KEY-----

⇒ OpenSSL "x509 -pubout" - Export Public Key"

⇐ OpenSSL "x509 -req" - Error "my_ca.srl: No error"

⇑ OpenSSL "x509" Command

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RSA 1024-Bit Public Key - 483E29910D4BA1C6AA61E28654E9FF2097B83217
Public Key Summary: Key Identifier: 48:3E:29:91:0D:4B:A1:C6:AA:61: E2:86:54:E9:FF:20:97:B8:32:17Name: Class 1 Public Primary Certification Authority - G2, (c) 1998 VeriSign, Inc. - For authorized use only, VeriSign Trust Network Received at FYIcenter.com on: 2016-09-20 2017-02-24, 1467👍, 1💬

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Key Summary: Type: RSA 1024-Bit Public Key Identifier: BF:4D:54:39:EE:B4:57:07:97:F0: A6:B9:89:7B:24:8F:97:31:D2:D0Name: Equifax Secure Global eBusiness CA-1 Received at FYIcenter.com on: 2016-09-20 2016-09-22, 1430👍, 0💬

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Key Summary: Type: RSA 2048-Bit Public Key Identifier: 97:04:C3:07:B1:31:C3:C3:E0:5A: BC:EC:5B:8C:85:E8:FF:9A:A9:DFName: Dow Jones Enterprise Root CA Received at FYIcenter.com on: 2016-09-20 2016-09-22, 996👍, 0💬

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