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POInvalid public keys when using the Ruby OpenSSL library
 

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  1. POInvalid public keys when using the Ruby OpenSSL library
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    <p>I'm trying to generate RSA keypairs in Ruby, mostly using the examples from <a href="http://stuff-things.net/2009/12/11/generating-rsa-key-pairs-in-ruby/" rel="nofollow">this blog post</a>. Here is my slightly modified code:</p> <pre><code>def generate_keypair(passphrase) rsa_key = OpenSSL::PKey::RSA.new(2048) cipher = OpenSSL::Cipher::Cipher.new('aes-256-cbc') private_key = rsa_key.to_pem(cipher, passphrase) public_key = rsa_key.public_key.to_pem return private_key, public_key end </code></pre> <p>This successfully generates a private key and a public key, and I can write those out to files on the filesystem.</p> <pre><code>irb(main):002:0&gt; private_key1, public_key1 = generate_keypair('test') [...output of keys...] irb(main):003:0&gt; File.open("key.pem","w") {|f| f.write(private_key1) } =&gt; 1766 irb(main):004:0&gt; File.open("pubkey.pem","w") {|f| f.write(public_key1) } =&gt; 426 </code></pre> <p>However, OpenSSL complains when I try to use this public key:</p> <pre><code>$ openssl rsautl -encrypt -inkey pubkey.pem -pubin -in text.txt -out text.ssl unable to load Public Key </code></pre> <p>If I use the <code>openssl</code> tool to extract the public key from the private key then everything works:</p> <pre><code>$ openssl rsa -in key.pem -pubout -out pubkey2.pem Enter pass phrase for key.pem: writing RSA key $ openssl rsautl -encrypt -inkey pubkey2.pem -pubin -in text.txt -out text.ssl $ openssl rsautl -decrypt -inkey key.pem -in text.ssl Enter pass phrase for key.pem: this is a file that needs to be encrypted </code></pre> <p>The public key that the Ruby OpenSSL library produced is different from the public key that the <code>openssl</code> cli tool extracted from the private key:</p> <pre><code>$ cat pubkey.pem -----BEGIN RSA PUBLIC KEY----- MIIBCgKCAQEAzgNcsEL7yGBoLBYBXFYrDL6oLP8ZbW9+VwdoXyNG6Qt/NEhEx4Ww 5yOxtXAbqeUwyvbTUxRrJ02dQcb4FGcSMDgz2QHIZyCuDJkgC9Wj7KI1Q7g0GV+7 DcZvLcwPZOhLXqUzlcZXjDWM1PZ+az734qEribgyI+87LB8TujG8v5iOvdzT/Je4 JAllToZVGC3RddfTc6ww37gB39B++FYNzPg+nrIEU45KgEWPo2eJxBpX29lACh6q EEBCQr9xyLxOC2eomYIl3dG2dV7nGGH7Pur2HjppgJphBvNkwxIWUa/pD6hAnOQ4 MkDDFGwWv7eJLb4UZuZjafTbqokHved3bwIDAQAB -----END RSA PUBLIC KEY----- $ cat pubkey2.pem -----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzgNcsEL7yGBoLBYBXFYr DL6oLP8ZbW9+VwdoXyNG6Qt/NEhEx4Ww5yOxtXAbqeUwyvbTUxRrJ02dQcb4FGcS MDgz2QHIZyCuDJkgC9Wj7KI1Q7g0GV+7DcZvLcwPZOhLXqUzlcZXjDWM1PZ+az73 4qEribgyI+87LB8TujG8v5iOvdzT/Je4JAllToZVGC3RddfTc6ww37gB39B++FYN zPg+nrIEU45KgEWPo2eJxBpX29lACh6qEEBCQr9xyLxOC2eomYIl3dG2dV7nGGH7 Pur2HjppgJphBvNkwxIWUa/pD6hAnOQ4MkDDFGwWv7eJLb4UZuZjafTbqokHved3 bwIDAQAB -----END PUBLIC KEY----- </code></pre> <p>I'm not quite sure what is going on here, but it seems as if the Ruby OpenSSL library is producing an invalid public key pem file. Am I doing something wrong?</p>
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