I've inherited a migration project. The legacy database has PHPass encryption and the new database is MD5. Is it possible to "upgrade" from MD5 to PHPass and keep data integrity?
Is it possible to rewrite encryption from MD5 to PHPass without losing data?
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No. The whole point of hashes is that they are not reversible.
To "port" or "upgrade" a hash from MD5 to PHPass (or vice versa) you would need to reverse the MD5 hashing in order to pass the unhashed password into PHPass, which is impossible.