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pam_unix: Add support for crypt_checksalt, if libcrypt supports it.
libxcrypt v4.3 has added the crypt_checksalt function to whether the prefix at the begining of a given hash string refers to a supported hashing method. Future revisions of this function will add support to check whether the hashing method, the prefix refers to, was disabled or considered deprecated by the system's factory presets or system administrator. Furthermore it will be able to detect whether the parameters, which are used by the corresponding hashing method, being encoded in the hash string are not considered to be strong enough anymore. *modules/pam_unix/passverify.c: Add support for crypt_checksalt.
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