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RSA with no padding

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# encoding: UTF-8
 
require 'ruby-debug'
require 'openssl'
 
def crypt(value, padding = OpenSSL::PKey::RSA::NO_PADDING)
public_key = get_rsa_key 'public.pem'
public_key.public_encrypt value, padding
end
 
def get_rsa_key(key, password = '')
return key if key.is_a?(OpenSSL::PKey::RSA)
 
key = File.read(key) if key !~ /^-+BEGIN .* KEY-+$/
 
return OpenSSL::PKey::RSA.new(key, password)
end
 
crypt 'xpto' #=> OpenSSL::PKey::RSAError Exception: data too small for key size
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