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crypt_sha512(7)

cr...2(7)Standards, Environments, Macros, Character Sets, and miscellancyr...2(7)

NAME
       crypt_sha512 - password hashing module using SHA-512 message hash algo‐
       rithm

SYNOPSIS
       /usr/lib/security/$ISA/crypt_sha512.so

DESCRIPTION
       The  crypt_sha512  module  is a one-way password hashing module for use
       with crypt(3C) that uses the SHA-512 message hash algorithm. The  algo‐
       rithm identifier for crypt.conf(5) and policy.conf(5) is 6.


       This  module  is designed to make it difficult to crack passwords using
       brute force attacks based on high speed  SHA-512  implementations  that
       use code inlining, unrolled loops, and table lookup.


       The maximum password length for crypt_sha512 is 255 characters.


       The  following  options  can  be  passed  to  the  module  by  means of
       crypt.conf(5):

       rounds=positive_number

           Specifies the number of rounds of SHA-512 to use in  generation  of
           the  salt;  the  default  number of rounds is 5000. Negative values
           have no effect and are ignored. The minimum number of rounds cannot
           be below 1000.

           The number of additional rounds is stored in the  salt  string  re‐
           turned by crypt_gensalt(3C). For example:


             $6,rounds=6000$nlxmTTpz$

           When crypt_gensalt(3C) is being used to generate a new salt, if the
           number  of additional rounds configured in crypt.conf(5) is greater
           than that in the old salt, the value from crypt.conf(5) is used in‐
           stead. This allows for migration to stronger (but more time-consum‐
           ing) salts on password change.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE VALUE _ Availabilitysystem/library _ Interface StabilityCommit‐
       ted


SEE ALSO
       passwd(1),    crypt(3C),   crypt_genhash_impl(3C),   crypt_gensalt(3C),
       crypt_gensalt_impl(3C),  getpassphrase(3C),  crypt.conf(5),  passwd(5),
       policy.conf(5), attributes(7)

HISTORY
       The crypt_sha512 module was added to Solaris in Solaris 10 8/08 (Update
       6).

Oracle Solaris 11.4               21 Jun 2021                        cr...2(7)
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