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Go implementation of bcrypt_pbkdf(3) from OpenBSD
(a variant of PBKDF2 with bcrypt-based PRF).
USAGE
func Key(password, salt []byte, rounds, keyLen int) ([]byte, error)
Key derives a key from the password, salt and rounds count, returning a
[]byte of length keyLen that can be used as cryptographic key.
Remember to get a good random salt of at least 16 bytes. Using a higher
rounds count will increase the cost of an exhaustive search but will also
make derivation proportionally slower.
REFERENCES
* https://github.com/dchest/bcrypt_pbkdf
* http://www.tedunangst.com/flak/post/bcrypt-pbkdf
* http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libutil/bcrypt_pbkdf.c
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