Ruby

Get EC Public Key from EC Private Key

See more ECC Examples

Demonstrates how to get an EC public key from an EC private key. Ruby

require 'chilkat'

success = false

# 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 == false)
    print privKey.lastErrorText() + "\n";
    exit
end

# Get the public key.
pubKey = Chilkat::CkPublicKey.new()
privKey.ToPublicKey(pubKey)

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