crypt_sha256 man page on SunOS

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crypt_sha256(5)	      Standards, Environments, and Macros      crypt_sha256(5)

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(4) and policy.conf(4) is 5.

       This module is designed to make it difficult to	crack  passwords  that
       use  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(4):

       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(4) is  greater
	   than	 that  in  the	old salt, the value from crypt.conf(4) is used
	   instead. This allows for migration to stronger (but more  time-con‐
	   suming) salts on password change.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Committed			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       passwd(1),    crypt(3C),	  crypt_genhash_impl(3C),   crypt_gensalt(3C),
       crypt_gensalt_impl(3C),	getpassphrase(3C),  crypt.conf(4),  passwd(4),
       policy.conf(4), attributes(5)

SunOS 5.10			  8 May 2008		       crypt_sha256(5)
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