Created
September 8, 2015 22:06
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| package ot.security; | |
| import java.nio.file.Files; | |
| import java.nio.file.Path; | |
| import java.nio.file.Paths; | |
| import java.security.Key; | |
| import java.security.SecureRandom; | |
| import java.util.Base64; | |
| import java.util.Base64.Encoder; | |
| import javax.crypto.Mac; | |
| import javax.crypto.spec.SecretKeySpec; | |
| public class MacTest { | |
| public static void main(String[] args) throws Exception { | |
| Path macKey = Paths.get("/tmp/crypt/mac.key"); | |
| if (Files.notExists(macKey)) { | |
| final byte[] keybytes0 = new byte[512]; | |
| new SecureRandom().nextBytes(keybytes0); | |
| Files.write(macKey, keybytes0); | |
| } | |
| final Encoder encoder = Base64.getEncoder(); | |
| final byte[] keybytes = Files.readAllBytes(macKey); | |
| Key key = new SecretKeySpec(keybytes, "HMACSHA512"); | |
| Mac mac = Mac.getInstance("HMACSHA512"); | |
| mac.init(key); | |
| System.out.println(mac.getMacLength()); | |
| byte[] hashValue = mac.doFinal("the lazy dog jumps over the quick brown fox".getBytes()); | |
| System.out.println(encoder.encodeToString(hashValue)); | |
| System.out.println(encoder.encodeToString(key.getEncoded())); | |
| } | |
| } |
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