crypt_sha512 man page on SmartOS

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CRYPT_SHA512(5)						       CRYPT_SHA512(5)

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


       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(4) and policy.conf(4) is 6.

       This module is designed to make it difficult to	crack  passwords  that
       use  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


	   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
	   returned by crypt_gensalt(3C). For example:


	   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.

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

       │Interface Stability │ Committed	      │
       │MT-Level	    │ Safe	      │

       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)

				  May 8, 2008		       CRYPT_SHA512(5)

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