http://idk.i2p/javadoc-i2p/net/i2p/crypto/HKDF.html
Parameters: key - first 32 bytes used as the key info - non-null ASCII, "" if none out - must be exactly 32 bytes calculate public void calculate (byte[] key,
byte[] data,
byte[] out,
byte[] out2,
int off2) Two outputs, no info. Parameters: key - first 32 bytes used as the key out - 32 bytes will be copied to here out2 - 32 bytes will be copied to here, may be the same as out off2 - offset for copy to out2 calculate public void calculate (byte[] key,
byte[] data, String info,
byte[]...