phpman > man > crypt_preferred_method(3)

CRYPT_PREFERRED_METHO... BSD Library Functions Manual CRYPT_PREFERRED_METHO...

NAME
     crypt_preferred_method — get the prefix of the preferred hash method

LIBRARY
     Crypt Library (libcrypt, -lcrypt)

SYNOPSIS
     #include <crypt.h>

     const char*
     crypt_preferred_method(void);

DESCRIPTION
     crypt_preferred_method is a convenience function to get the prefix of the preferred hash
     method.  If a preferred method is available, it is the same as the one also used by the
     crypt_gensalt functions, if their given prefix parameter is NULL.

RETURN VALUES
     The string returned equals the prefix of the preferred hash method.  If no preferred hash
     method is available it is NULL.  It is safe to pass the string returned by
     crypt_preferred_method directly to crypt_gensalt without prior string-sanitizing nor NULL-
     pointer checks.

FEATURE TEST MACROS
     <crypt.h> will define the macro CRYPT_PREFERRED_METHOD_AVAILABLE if crypt_preferred_method is
     available in the current version of libxcrypt.

PORTABILITY NOTES
     The function crypt_preferred_method is not part of any standard.  It was added to libxcrypt in
     version 4.4.0.

ATTRIBUTES
     For an explanation of the terms used in this section, see attributes(7).
     ┌───────────────────────┬───────────────┬─────────┐
     │Interface              │ Attribute     │ Value   │
     ├───────────────────────┼───────────────┼─────────┤
     │crypt_preferred_method │ Thread safety │ MT-Safe │
     └───────────────────────┴───────────────┴─────────┘

SEE ALSO
     crypt_gensalt(3)

libxcrypt                      November 16, 2018                     libxcrypt