(Ruby) Get ECC Public Key from ECC Private Key

Demonstrates how to get an ECC public key from an ECC private key.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# We have an ECC private key...
# The contents of the private key PEM file look like this:

# 	-----BEGIN PRIVATE KEY-----
# 	MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg3J8q/24D1sEKGdP9
# 	72MGYElLGpw/a56Y3t6pfON3uhShRANCAATlSmoizyhAwoYZAOuFBATl07/1RR54
# 	a1Dzfm16grxJe666AGKR+bSs24hk7TEpaeCTvT8YOOM3l+xKFg7zq6Q9
# 	-----END PRIVATE KEY-----

privKey = Chilkat::CkPrivateKey.new()
success = privKey.LoadPemFile("qa_data/ecc/secp256r1-key-pkcs8.pem")
if (success != true)
    print privKey.lastErrorText() + "\n";
    exit
end

# Get the public key.
# pubKey is a CkPublicKey
pubKey = privKey.GetPublicKey()
if (privKey.get_LastMethodSuccess() != true)
    print privKey.lastErrorText() + "\n";
    exit
end

# Save the public key to a PEM file.
success = pubKey.SavePemFile(false,"qa_data/ecc/secp256r1-pubkey.pem")
if (success != true)
    print pubKey.lastErrorText() + "\n";

    exit
end

# The contents of the ECC public key PEM file look like this:

# 	-----BEGIN PUBLIC KEY-----
# 	MIIBSzCCAQMGByqGSM49AgEwgfcCAQEwLAYHKoZIzj0BAQIhAP////8AAAABAAAA
# 	AAAAAAAAAAAA////////////////MFsEIP////8AAAABAAAAAAAAAAAAAAAA////
# 	///////////8BCBaxjXYqjqT57PrvVV2mIa8ZR0GsMxTsPY7zjw+J9JgSwMVAMSd
# 	NgiG5wSTamZ44ROdJreBn36QBEEEaxfR8uEsQkf4vOblY6RA8ncDfYEt6zOg9KE5
# 	RdiYwpZP40Li/hp/m47n60p8D54WK84zV2sxXs7LtkBoN79R9QIhAP////8AAAAA
# 	//////////+85vqtpxeehPO5ysL8YyVRAgEBA0IABOVKaiLPKEDChhkA64UEBOXT
# 	v/VFHnhrUPN+bXqCvEl7rroAYpH5tKzbiGTtMSlp4JO9Pxg44zeX7EoWDvOrpD0=
# 	-----END PUBLIC KEY-----

print "Success." + "\n";