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OpenSolaris 2009.06 - man page for crypt_sha256 (opensolaris section 5)

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

       crypt_sha256 - password hashing module using SHA-256 message hash algorithm


       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 algorithm 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):


	   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_gen-
	   salt(3C). For example:


	   When crypt_gensalt(3C) is being used to generate a new salt, if the	number	of  addi-
	   tional  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-consuming) salts on password change.

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

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |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)

SunOS 5.11				    8 May 2008				  crypt_sha256(5)
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