Key derives a key from the password, salt and iteration count, returning a []byte of length keylen that can be used as cryptographic key. The key is derived based on the method described as PBKDF2 with the HMAC variant using the supplied hash function.

For example, to use a HMAC-SHA-1 based PBKDF2 key derivation function, you can get a derived key for e.g. AES-256 (which needs a 32-byte key) by doing:

dk := pbkdf2.Key([]byte("some password"), salt, 4096, 32, sha1.New)

Remember to get a good random salt. At least 8 bytes is recommended by the RFC.

Using a higher iteration count will increase the cost of an exhaustive search but will also make derivation proportionally slower.

Key is referenced in 1 repository