+ static char[] bytesToChars(Object obj) {
+ if (obj instanceof char[])
+ return (char[]) obj;
+ if (!(obj instanceof byte[]))
+ throw new IllegalArgumentException(obj.getClass() + " is not a byte array");
+ ByteBuffer fromBuffer = ByteBuffer.wrap((byte[]) obj);
+ CharBuffer toBuffer = StandardCharsets.UTF_8.decode(fromBuffer);
+ char[] res = Arrays.copyOfRange(toBuffer.array(), toBuffer.position(), toBuffer.limit());
+ // Arrays.fill(fromBuffer.array(), (byte) 0); // clear sensitive data
+ // Arrays.fill((byte[]) obj, (byte) 0); // clear sensitive data
+ // Arrays.fill(toBuffer.array(), '\u0000'); // clear sensitive data
+ return res;
+ }
+
+ static byte[] charsToBytes(char[] chars) {
+ CharBuffer charBuffer = CharBuffer.wrap(chars);
+ ByteBuffer byteBuffer = StandardCharsets.UTF_8.encode(charBuffer);
+ byte[] bytes = Arrays.copyOfRange(byteBuffer.array(), byteBuffer.position(), byteBuffer.limit());
+ // Arrays.fill(charBuffer.array(), '\u0000'); // clear sensitive data
+ // Arrays.fill(byteBuffer.array(), (byte) 0); // clear sensitive data
+ return bytes;