java hmac/sha512 generation

Question

I have this php code which generate a HMAC (and not a simple message digest):

Answer 1

try that :

private String generateHMAC( String datas )
{
    MessageDigest md = MessageDigest.getInstance("SHA-512");

    md.update(datas.getBytes("UTF-8")); // Change this to "UTF-16" if needed
    byte[] digest = md.digest();

    StringBuffer hexString = new StringBuffer();
    for (int i=0;i