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  1. PO
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    <p>You don't need to actually implement PBEWithMD5andDES assuming ruby has a DES implementation. What you need to implement is the key derivation function ( who you get a key out of a password) and then feed that derived key to DES with the appropriate mode and padding.</p> <p>Thankfully, the key derivation function is not particularly security critical in implementation, so you can do it yourself safely enough. According to the <a href="http://tools.ietf.org/html/rfc2898" rel="nofollow">rfc</a>, PBEwithMD5AndDES is actually the PBKDF1 ( a ker derivation function) used with DES in CBC mode . </p> <p>PBKDF1 does not look that hard to implement . Looks like you can do it with a for loop and an md5 call.</p> <p>Note that you may still get some odd results because of the possibility of a different padding scheme being used in Java and Ruby. I assume that the spec one is pkcs 1.5 padding, but at a quick glance, I can't confirm this</p> <blockquote> <p><a href="http://tools.ietf.org/html/rfc2898#section-5.1" rel="nofollow">5.1 PBKDF1</a></p> <p>PBKDF1 applies a hash function, which shall be MD2 [6], MD5 [19] or SHA-1 [18], to derive keys. The length of the derived key is bounded<br> by the length of the hash function output, which is 16 octets for MD2 and MD5 and 20 octets for SHA-1. PBKDF1 is compatible with the key<br> derivation process in PKCS #5 v1.5.</p> <p>PBKDF1 is recommended only for compatibility with existing<br> applications since the keys it produces may not be large enough for<br> some applications.</p> <p>PBKDF1 (P, S, c, dkLen)</p> <p>Options: Hash underlying hash function</p> <p>Input: P password, an octet string S salt, an eight-octet string c iteration count, a positive integer dkLen intended length in octets of derived key, a positive integer, at most 16 for MD2 or MD5 and 20 for SHA-1</p> <p>Output: DK derived key, a dkLen-octet string</p> <p>Steps:</p> <pre><code> 1. If dkLen &gt; 16 for MD2 and MD5, or dkLen &gt; 20 for SHA-1, output "derived key too long" and stop. 2. Apply the underlying hash function Hash for c iterations to the concatenation of the password P and the salt S, then extract the first dkLen octets to produce a derived key DK: T_1 = Hash (P || S) , T_2 = Hash (T_1) , ... T_c = Hash (T_{c-1}) , DK = Tc&lt;0..dkLen-1&gt; 3. Output the derived key DK. </code></pre> </blockquote>
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    1. POImplementation of PBEWithMD5AndDES in Ruby
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    1. USimichaelmiers
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    1. COEven though this is old ... +1 for a correct answer. I know because I solved exactly this problem in python. Did the OP's problem get solved? I can do a ruby implementation of this if you still need it.
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      1. USBlake Miller
 

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