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while working on a project, I found that "user_pass" column in "wp_users" table is varchar(64). WordPress always stores user password in md5 which is a 32 char ASCII string. So why not store it in char(32) with ascii collation. I am asking because I am working on a table that stores user password. Is there any other advantage of using varchar(64).

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    I don't think that WordPress uses md5. It uses phpass – shea Jul 10 '15 at 9:51
  • phpass is a hashing framework which supports different hashing algorithms, md5 is one of them. However, it is true that WordPress no more uses md5. – Nishant Kumar Jul 13 '15 at 6:04
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It is because of different encrypted algorithm. Sometimes users will override the MD5, which is the default algorithm, and add their own, which might need a little longer length to store the password.

Take a look at the Q&A's »What data type to use for hashed password field and what length?«, having detailed information about hashes and their length, at Stackoverflow for reference.

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