in src/main/java/org/apache/sling/auth/form/impl/TokenStore.java [377:388]
private String byteToHex(byte[] base) {
char[] c = new char[base.length * 2];
int i = 0;
for (byte b : base) {
int j = b;
j = j + 128;
c[i++] = TOHEX[j / 0x10];
c[i++] = TOHEX[j % 0x10];
}
return new String(c);
}