$2y$05$68LWs2pXiEvhVTacJ9PX/elfa1zq9jCBlv61hEw1pCvAHlaJyeMwW
This hash value is 70 characters long. How can I tell what type of encoding was used to generate it? Also, how many bits does each character hold?
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1$\begingroup$ It looks crypt-formatted. This documentation page will probably help you. $\endgroup$– duskSep 24, 2017 at 17:01
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That looks like bcrypt.
There are four parts:
$2y- identifier that this is bcrypt in modular crypt format.$05- number of key expansion rounds: in this case, it is 2568LWs...X/e- this is the salt. A total of 128 bits encoded in base64.lfa1z...MwW- this is the hash. A total of 184 bits encoded in base64.
Since base64 encodes three bytes to four base64 characters, you get 6 bits for each base64 character.
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1$\begingroup$ +1, but three bytes encode to four characters (3*8/6) not six. $\endgroup$– RupSep 25, 2017 at 2:30
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$\begingroup$ @Rup Oh right! I was probably thinking six bits! $\endgroup$ Sep 25, 2017 at 19:11