I want to convert a String to a SHA-256 Hash. I am using this code:
String text = "YOLO";
MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte[] hash = digest.digest(text.getBytes("UTF-8"));
System.out.println(hash.toString());
The problem is, when I start the program, it prints
[B@28d93b30
Why is this, and how can solve this?
Thanks in advance,
Fihdi
As others have mentioned, you're using the default toString() method which simply outputs the class name and hashcode
If you want a hex print out of the contents of the byte array try... Hex.encodeHexString(byte[] data) from Apache Commons.
Also How to convert a byte array to a hex string in Java? has some examples for doing this without a library.
To print the bytes as hex (instead of that result, explained in How do I print my Java object without getting "SomeType@2f92e0f4"?), simply run:
System.out.println((new HexBinaryAdapter()).marshal(hash));
In JAVA, arrays do not override Object.toString(). Therefore, hash.toString() does not return a representation of the contents of the array, but rather a representation of the array itself. Apparently, this representation of an array is not very useful. The default toString() implementation returns
getClass().getName() + '@' + Integer.toHexString(hashCode())
I have also faced this type of issue and then solve in this way.
String text = "YOLO";
MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte[] hash = digest.digest(text.getBytes(StandardCharsets.UTF_8));
String encoded = DatatypeConverter.printHexBinary(hash);
System.out.println(encoded.toLowerCase());
