Turns out it was not that hard. Here is the code that got it working.
def encryptAuthParameter(user, password) do
# Convert to Base64
now_str = DateTime.utc_now() |> DateTime.to_unix(:millisecond) |> Integer.to_string()
login_msg = Base.encode64(user) <> ":" <> Base.encode64(password) <> ":" <> Base.encode64(now_str)
# Use public key to encode message
raw_p_key = getKeyFromPEM(@key)
[enc_p_key] = :public_key.pem_decode(raw_p_key)
p_key = :public_key.pem_entry_decode(enc_p_key)
enc_msg = :public_key.encrypt_public(login_msg, p_key)
# Base 64 encode the encrypted string
Base.encode64(enc_msg)
end
def getKeyFromPEM(filename) do
File.read!(filename)
end
