On Password Hashing and RFC 6070

The RFC Editor has announced a new document, RFC 6070, with test vectors for PKCS5 PBKDF2. The document grow out of my implementation of SCRAM for GNU SASL. During interop testing, more than one other implementation turned out to have mistakes in the PBKDF2 implementation. It didn’t help that there weren’t any stable test vectors for PBKDF2, so that we could do black-box testing of our PBKDF2 implementations against well-known and stable test vectors. Debugging this was time consuming. The document addresses this problem.

So what is PBKDF2?
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