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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Keys do
# Native generation of RSA keys is only available since OTP 20+ and in default build conditions
# We try at compile time to generate natively an RSA key otherwise we fallback on the old way.
try do
_ = :public_key.generate_key({:rsa, 2048, 65_537})
def generate_rsa_pem do
key = :public_key.generate_key({:rsa, 2048, 65_537})
entry = :public_key.pem_entry_encode(:RSAPrivateKey, key)
pem = :public_key.pem_encode([entry]) |> String.trim_trailing()
{:ok, pem}
end
rescue
_ ->
def generate_rsa_pem do
port = Port.open({:spawn, "openssl genrsa"}, [:binary])
{:ok, pem} =
receive do
{^port, {:data, pem}} -> {:ok, pem}
end
Port.close(port)
if Regex.match?(~r/RSA PRIVATE KEY/, pem) do
{:ok, pem}
else
:error
end
end
end
def keys_from_pem(pem) do
with [private_key_code] <- :public_key.pem_decode(pem),
private_key <- :public_key.pem_entry_decode(private_key_code),
{:RSAPrivateKey, _, modulus, exponent, _, _, _, _, _, _, _} <- private_key do
{:ok, private_key, {:RSAPublicKey, modulus, exponent}}
else
error -> {:error, error}
end
end
end
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