title: Which Cipher in Ruby OpenSSL API is equivalent to DES_ecb2_encrypt()?
body: <p>Which Cipher in Ruby's OpenSSL API is equivalent to the OpenSSL C function <code>DES_ecb2_encrypt()</code>? </p>
  
  <p>I see the following ciphers:</p>
  
  <pre><code> irb(main):003:0&gt; OpenSSL::Cipher.ciphers
   =&gt; ["AES-128-CBC", "AES-128-CFB", "AES-128-CFB1", "AES-128-CFB8", "AES-128-ECB", 
       "AES-128-OFB", "AES-192-CBC", "AES-192-CFB", "AES-192-CFB1", "AES-192-CFB8", 
       "AES-192-ECB", "AES-192-OFB", "AES-256-CBC", "AES-256-CFB", "AES-256-CFB1", 
       "AES-256-CFB8", "AES-256-ECB", "AES-256-OFB", "AES128", "AES192", "AES256", 
       "BF", "BF-CBC", "BF-CFB", "BF-ECB", "BF-OFB", "CAMELLIA-128-CBC", "CAMELLIA-128-CFB",
       "CAMELLIA-128-CFB1", "CAMELLIA-128-CFB8", "CAMELLIA-128-ECB", "CAMELLIA-128-OFB",
       "CAMELLIA-192-CBC", "CAMELLIA-192-CFB", "CAMELLIA-192-CFB1", "CAMELLIA-192-CFB8",
       "CAMELLIA-192-ECB", "CAMELLIA-192-OFB", "CAMELLIA-256-CBC", "CAMELLIA-256-CFB",
       "CAMELLIA-256-CFB1", "CAMELLIA-256-CFB8", "CAMELLIA-256-ECB", "CAMELLIA-256-OFB",
       "CAMELLIA128", "CAMELLIA192", "CAMELLIA256", "CAST", "CAST-cbc", "CAST5-CBC", 
       "CAST5-CFB", "CAST5-ECB", "CAST5-OFB", "DES", "DES-CBC", "DES-CFB", "DES-CFB1", 
       "DES-CFB8", "DES-ECB", "DES-EDE", "DES-EDE-CBC", "DES-EDE-CFB", "DES-EDE-OFB", 
       "DES-EDE3", "DES-EDE3-CBC", "DES-EDE3-CFB", "DES-EDE3-CFB1", "DES-EDE3-CFB8", 
       "DES-EDE3-OFB", "DES-OFB", "DES3", "DESX", "DESX-CBC", "RC2", "RC2-40-CBC", 
       "RC2-64-CBC", "RC2-CBC", "RC2-CFB", "RC2-ECB", "RC2-OFB", "RC4", "RC4-40", "SEED",
       "SEED-CBC", "SEED-CFB", "SEED-ECB", "SEED-OFB", "aes-128-cbc", "aes-128-cfb", 
       "aes-128-cfb1", "aes-128-cfb8", "aes-128-ecb", "aes-128-ofb", "aes-192-cbc", 
       "aes-192-cfb", "aes-192-cfb1", "aes-192-cfb8", "aes-192-ecb", "aes-192-ofb", 
       "aes-256-cbc", "aes-256-cfb", "aes-256-cfb1", "aes-256-cfb8", "aes-256-ecb", 
       "aes-256-ofb", "aes128", "aes192", "aes256", "bf", "bf-cbc", "bf-cfb", "bf-ecb", 
       "bf-ofb", "blowfish", "camellia-128-cbc", "camellia-128-cfb", "camellia-128-cfb1",
       "camellia-128-cfb8", "camellia-128-ecb", "camellia-128-ofb", "camellia-192-cbc",
       "camellia-192-cfb", "camellia-192-cfb1", "camellia-192-cfb8", "camellia-192-ecb",
       "camellia-192-ofb", "camellia-256-cbc", "camellia-256-cfb", "camellia-256-cfb1",
       "camellia-256-cfb8", "camellia-256-ecb", "camellia-256-ofb", "camellia128",
       "camellia192", "camellia256", "cast", "cast-cbc", "cast5-cbc", "cast5-cfb", 
       "cast5-ecb", "cast5-ofb", "des", "des-cbc", "des-cfb", "des-cfb1", "des-cfb8", 
       "des-ecb", "des-ede", "des-ede-cbc", "des-ede-cfb", "des-ede-ofb", "des-ede3", 
       "des-ede3-cbc", "des-ede3-cfb", "des-ede3-cfb1", "des-ede3-cfb8", "des-ede3-ofb",
       "des-ofb", "des3", "desx", "desx-cbc", "rc2", "rc2-40-cbc", "rc2-64-cbc", "rc2-cbc",
       "rc2-cfb", "rc2-ecb", "rc2-ofb", "rc4", "rc4-40", "seed", "seed-cbc", "seed-cfb",
       "seed-ecb", "seed-ofb"]
  </code></pre>
  
  <p>I basically need the Ruby equivalent of this function call in C:</p>
  
  <pre><code> DES_ecb2_encrypt((const_DES_cblock *)data, (DES_cblock *)data, &amp;des_key1, &amp;des_key2, 1);
  </code></pre>