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OpenSolaris 2009.06 - man page for crypt_sunmd5 (opensolaris section 5)

crypt_sunmd5(5) 	       Standards, Environments, and Macros		  crypt_sunmd5(5)

NAME
       crypt_sunmd5 - password hashing module using MD5 message hash algorithm

SYNOPSIS
       /usr/lib/security/$ISA/crypt_sunmd5.so

DESCRIPTION
       The  crypt_sunmd5  module is a one-way password hashing module for use with crypt(3C) that
       uses the MD5 message hash algorithm. The algorithm identifier for crypt.conf(4)	and  pol-
       icy.conf(4) is md5.

       This  module  is  designed  to  make  it difficult to crack passwords that use brute force
       attacks based on high speed MD5 implementations that use code  inlining,  unrolled  loops,
       and table lookup.

       The maximum password length for crypt_sunmd5 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  additional rounds of MD5 to use in
				   generation of the salt; the default number of rounds is  4096.
				   Negative  values  have no effect and are ignored, that is, the
				   number of rounds cannot be lowered below 4096.

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

				     $md5,rounds=1000$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-consuming) salts on password change.

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |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 5.11				   23 Dec 2003				  crypt_sunmd5(5)


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