1crypt_sha256(5)       Standards, Environments, and Macros      crypt_sha256(5)
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NAME

6       crypt_sha256 - password hashing module using SHA-256 message hash algo‐
7       rithm
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SYNOPSIS

10       /usr/lib/security/$ISA/crypt_sha256.so
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DESCRIPTION

14       The crypt_sha256 module is a one-way password hashing  module  for  use
15       with  crypt(3C) that uses the SHA-256 message hash algorithm. The algo‐
16       rithm identifier for crypt.conf(4) and policy.conf(4) is 5.
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19       This module is designed to make it difficult to  crack  passwords  that
20       use  brute  force  attacks  based on high speed SHA-256 implementations
21       that use code inlining, unrolled loops, and table lookup.
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24       The maximum password length for crypt_sha256 is 255 characters.
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27       The following  options  can  be  passed  to  the  module  by  means  of
28       crypt.conf(4):
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30       rounds=<positive_number>
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32           Specifies  the  number of rounds of SHA-256 to use in generation of
33           the salt; the default number of rounds  is  5000.  Negative  values
34           have no effect and are ignored. The minimum number of rounds cannot
35           be below 1000.
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37           The number of additional  rounds  is  stored  in  the  salt  string
38           returned by crypt_gensalt(3C). For example:
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40             $5,rounds=6000$nlxmTTpz$
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42           When crypt_gensalt(3C) is being used to generate a new salt, if the
43           number of additional rounds configured in crypt.conf(4) is  greater
44           than  that  in  the  old salt, the value from crypt.conf(4) is used
45           instead. This allows for migration to stronger (but more  time-con‐
46           suming) salts on password change.
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ATTRIBUTES

50       See attributes(5) for descriptions of the following attributes:
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55       ┌─────────────────────────────┬─────────────────────────────┐
56       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
57       ├─────────────────────────────┼─────────────────────────────┤
58       │Interface Stability          │Committed                    │
59       ├─────────────────────────────┼─────────────────────────────┤
60       │MT-Level                     │Safe                         │
61       └─────────────────────────────┴─────────────────────────────┘
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SEE ALSO

64       passwd(1),    crypt(3C),   crypt_genhash_impl(3C),   crypt_gensalt(3C),
65       crypt_gensalt_impl(3C),  getpassphrase(3C),  crypt.conf(4),  passwd(4),
66       policy.conf(4), attributes(5)
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70SunOS 5.11                        8 May 2008                   crypt_sha256(5)
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