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crypt_sha256(7)
Standards, Environments, Macros, Character Sets, and miscellany
crypt_sha256(7)
NAME
crypt_sha256 - password hashing module using SHA-256 message hash algo‐
rithm
SYNOPSIS
/usr/lib/security/$ISA/crypt_sha256.so
DESCRIPTION
The crypt_sha256 module is a one-way password hashing module for use
with crypt(3C) that uses the SHA-256 message hash algorithm. The algo‐
rithm identifier for crypt.conf(5) and policy.conf(5) is 5.
This module is designed to make it difficult to crack passwords using
brute force attacks based on high speed SHA-256 implementations that
use code inlining, unrolled loops, and table lookup.
The maximum password length for crypt_sha256 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-256 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
returned by crypt_gensalt(3C). For example:
$5,rounds=6000$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
instead. This allows for migration to stronger (but more time-con‐
suming) 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_sha256 module was added to Solaris in Solaris 10 8/08 (Update
6). It became the CRYPT_DEFAULT setting in the default policy.conf file
in Oracle Solaris 11.0.0.
Oracle Solaris 11.4 21 Jun 2021 crypt_sha256(7)