libcrypt-pbkdf2-perl 0.140890-1 (amd64 binary) in ubuntu utopic

 PBKDF2 (part of the PKCS#5 standard) is a secure password hashing
 algorithm that uses the techniques of "key strengthening" to make the
 complexity of a brute-force attack arbitrarily high. This module
 supports SHA-1 and SHA-2 as the underlying hash functions natively and
 can also use arbitrary Digest-compatible classes. It allows for an
 arbitrary number of iterations of the hashing function, and a nearly
 unlimited output hash size (up to 2**32 - 1 times the size of the output
 of the backend hash). The hash is salted, as any password hash should
 be, and the salt may also be of arbitrary size.