import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
public class HMACSHA1 {
private static final String HMAC_SHA1 = "HmacSHA1";
public static String getSignature(String data,String key) throws Exception{
byte[] keyBytes=key.getBytes();
SecretKeySpec signingKey = new SecretKeySpec(keyBytes, HMAC_SHA1);
Mac mac = Mac.getInstance(HMAC_SHA1);
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(data.getBytes());
StringBuilder sb=new StringBuilder();
for(byte b:rawHmac){
sb.append(byteToHexString(b));
}
return sb.toString();
}
private static String byteToHexString(byte ib){
char[] Digit={
'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'
};
char[] ob=new char[2];
ob[0]=Digit[(ib>>>4)& 0X0f];
ob[1]=Digit[ib & 0X0F];
String s=new String(ob);
return s;
}
}