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crypt_sunmd5(7)
Standards, Environments, Macros, Character Sets, and miscellany
crypt_sunmd5(7)
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(5) and policy.conf(5) 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(5):
rounds=positive_number
Specifies the number of additional rounds of MD5 to use in genera‐
tion 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(5) is greater
than that in the old salt, the value from crypt.conf(5) is used
instead. This allows for migration to stronger (but more time-con‐
suming) salts on password change.
SECURITY
The MD5 algorithm is currently considered weak for cryptographic use.
This algorithm should be used only for compatibility with legacy sys‐
tems and password entries. It is no longer included in the default
CRYPT_ALGORITHMS_ALLOW list of algorithms to use to hash new passwords
in policy.conf.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitysystem/library _ Interface StabilityCommit‐
ted
SEE ALSO
passwd(1), crypt_gensalt(3C), getpassphrase(3C), crypt(3C), crypt_gen‐
hash_impl(3C), crypt_gensalt_impl(3C), crypt.conf(5), passwd(5), pol‐
icy.conf(5), attributes(7)
HISTORY
The crypt_sunmd5 module was added to Solaris in Solaris 9 12/02 (Update
2). It was removed from the CRYPT_ALGORITHMS_ALLOW list of algorithms
to use to hash new passwords in the default policy.conf in Oracle
Solaris 11.4.0.
Oracle Solaris 11.4 21 Jun 2021 crypt_sunmd5(7)