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Fully backwards compatible. New user passwords will be hashed using PBKDF2 (10000 iterations, sha256, 16 byte salt) and stored in MongoDB (hash length 32) along with a pass_ver field (pass_ver = 1). Users with no pass_ver field (or pass_ver = 0) will be validated using MD5. I have been using this exact code in production with 1000+ users.