Issue on adding SSH key to GitHub
ssh-keygen will generate you a pair of keys, one private and one public. It sounds like you uploaded the wrong one. GitHub wants the public key, typically here: ~/.ssh/id_rsa.pub.
ecdsa
How to convert an ECDSA key to PEM format
You are claiming your raw key is in OpenSSL’s DER format, which it isn’t. Also you are claming a private key is a public key, which it isn’t, and claiming it’s password-encrypted which is wrong either way: public keys are never encrypted and private keys in OpenSSL’s ‘traditional’ aka ‘legacy’ algorithm-specific DER formats (for ECC, … Read more
Loading raw 64-byte long ECDSA public key in Java
Java 7 is required for the EC functionality and Java 8 for the Base 64 encoder / decoder, no additional libraries – just plain Java. Note that this will actually display the public key as a named curve when printed out, something most other solutions won’t do. If you have an up-to-date runtime, this other … Read more