compute Hmac - Java Security

Java examples for Security:SHA

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Description

compute Hmac

Demo Code


//package com.java2s;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.*;
import java.security.spec.AlgorithmParameterSpec;

public class Main {
    public static byte[] computeHmac(String key, String macAlgoJavaName,
            String data) {//from  www.  ja  va  2  s .  co m
        Mac mac = getMac(macAlgoJavaName);
        return computeHmac(key, mac, data);
    }

    public static byte[] computeHmac(byte[] key, String macAlgoJavaName,
            String data) {
        return computeHmac(key, macAlgoJavaName, null, data);
    }

    public static byte[] computeHmac(byte[] key, String macAlgoJavaName,
            AlgorithmParameterSpec spec, String data) {
        Mac mac = getMac(macAlgoJavaName);
        return computeHmac(new SecretKeySpec(key, mac.getAlgorithm()), mac,
                spec, data);
    }

    public static byte[] computeHmac(String key, Mac hmac, String data) {
        try {
            return computeHmac(key.getBytes("UTF-8"), hmac, data);
        } catch (UnsupportedEncodingException e) {
            throw new SecurityException(e);
        }
    }

    public static byte[] computeHmac(byte[] key, Mac hmac, String data) {
        SecretKeySpec secretKey = new SecretKeySpec(key,
                hmac.getAlgorithm());
        return computeHmac(secretKey, hmac, data);
    }

    public static byte[] computeHmac(Key secretKey, Mac hmac, String data) {
        return computeHmac(secretKey, hmac, null, data);
    }

    public static byte[] computeHmac(Key secretKey, Mac hmac,
            AlgorithmParameterSpec spec, String data) {
        initMac(hmac, secretKey, spec);
        return hmac.doFinal(data.getBytes());
    }

    public static Mac getMac(String macAlgoJavaName) {
        return getMac(macAlgoJavaName, (String) null);
    }

    public static Mac getMac(String macAlgoJavaName, String provider) {
        try {
            return provider == null ? Mac.getInstance(macAlgoJavaName)
                    : Mac.getInstance(macAlgoJavaName, provider);
        } catch (NoSuchAlgorithmException e) {
            throw new SecurityException(e);
        } catch (NoSuchProviderException e) {
            throw new SecurityException(e);
        }
    }

    public static Mac getMac(String macAlgoJavaName, Provider provider) {
        try {
            return Mac.getInstance(macAlgoJavaName, provider);
        } catch (NoSuchAlgorithmException e) {
            throw new SecurityException(e);
        }
    }

    private static void initMac(Mac hmac, byte[] key,
            AlgorithmParameterSpec spec) {
        initMac(hmac, new SecretKeySpec(key, hmac.getAlgorithm()), spec);

    }

    private static void initMac(Mac hmac, Key secretKey,
            AlgorithmParameterSpec spec) {
        try {
            if (spec == null) {
                hmac.init(secretKey);
            } else {
                hmac.init(secretKey, spec);
            }
        } catch (InvalidKeyException e) {
            throw new SecurityException(e);
        } catch (InvalidAlgorithmParameterException e) {
            throw new SecurityException(e);
        }
    }
}

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