Ruby crypto sign/verify

signer.rb

require 'openssl'
require 'base64'

private_key = File.read("./salesforce_private.key")
public_key  = File.read("./salesforce_public.key")

data = "reports50"

priv_key = OpenSSL::PKey::RSA.new(private_key)
signature = priv_key.sign_pss("RSA-SHA512", data, salt_length: :digest, mgf1_hash: "RSA-SHA512")
puts Base64.strict_encode64(signature)

# pub_key = priv_key.public_key
# puts pub_key.verify_pss("RSA-SHA512", signature, data, salt_length: :auto, mgf1_hash: "RSA-SHA512") # => true

Here are the docs: https://ruby-doc.org/stdlib-3.1.0/libdoc/openssl/rdoc/OpenSSL/PKey/RSA.html#method-i-sign_pss