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CRYPT_CHECKSALT(3) Library Functions Manual CRYPT_CHECKSALT(3) NAME crypt_checksalt -- validate a crypt setting string LIBRARY Crypt Library (libcrypt, -lcrypt) SYNOPSIS #include <crypt.h> int crypt_checksalt(const char *setting); DESCRIPTION crypt_checksalt checks the setting string against the system configura- tion and reports whether the hashing method and parameters it specifies are acceptable. It is intended to be used by programs such as login(1) to determine whether the user's passphrase should be re-hashed using the currently preferred hashing method. RETURN VALUES The return value is 0 if there is nothing wrong with this setting. Otherwise, it is one of the following constants: CRYPT_SALT_OK setting is a fully correct setting string. This constant is guaranteed to equal 0. CRYPT_SALT_INVALID setting is not a valid setting string; either it specifies a hashing method that is not known to this version of libxcrypt, or it specifies invalid parameters for the method. CRYPT_SALT_METHOD_DISABLED (Not implemented, yet) setting specifies a hashing method that is no longer allowed to be used at all; crypt will fail if passed this setting. Manual intervention will be required to reactivate the user's account. CRYPT_SALT_METHOD_LEGACY setting specifies a hashing method that is no longer considered strong enough for use with new passphrases. crypt will still au- thenticate a passphrase against this setting, but if authentica- tion succeeds, the passphrase should be re-hashed using the cur- rently preferred method. CRYPT_SALT_TOO_CHEAP (Not implemented, yet) setting specifies cost parameters that are considered too cheap for use with new passphrases. crypt will still authenticate a passphrase against this setting, but if authentication succeeds, the passphrase should be re-hashed using the currently preferred method. FEATURE TEST MACROS <crypt.h> will define the macro CRYPT_CHECKSALT_AVAILABLE if crypt_checksalt is available in the current version of libxcrypt. BUGS Since full configurability is not yet implemented, the current imple- mentation will only ever return CRYPT_SALT_OK (0) or CRYPT_SALT_INVALID when invoked. PORTABILITY NOTES The function crypt_checksalt is not part of any standard. It was added to libxcrypt in version 4.3.0. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). +-----------------+---------------+---------+ | Interface | Attribute | Value | +-----------------+---------------+---------+ | crypt_checksalt | Thread safety | MT-Safe | +-----------------+---------------+---------+ SEE ALSO crypt(3), crypt_gensalt(3), crypt(5) libxcrypt November 8, 2018 CRYPT_CHECKSALT(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | FEATURE TEST MACROS | BUGS | PORTABILITY NOTES | ATTRIBUTES | SEE ALSO
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