calculate String hash using HmacSHA1 - Android java.lang

Android examples for java.lang:String Hash

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Description

calculate String hash using HmacSHA1

Demo Code


import java.security.SignatureException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import android.util.Base64;

public class Main{
    private static final String HMAC_SHA1_ALGORITHM = "HmacSHA1";
    public static String calAuthorizationForDRM(String secretKey,
            String expire, String nonce) throws SignatureException {

        StringBuffer sBuffer = new StringBuffer();
        sBuffer.append("GET").append("\n");
        sBuffer.append(expire).append("\n");
        sBuffer.append("tag").append("=")
                .append(nonce);/*from ww w  . j  a va 2 s  . co m*/

        String serverSignature = calculateRFC2104HMAC(sBuffer.toString(),
                secretKey);
        return serverSignature;

    }
    public static String calculateRFC2104HMAC(String data, String key)
            throws SignatureException {

        String result;
        try {
            // get an hmac_sha1 key from the raw key bytes
            SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(),
                    HMAC_SHA1_ALGORITHM);
            // get an hmac_sha1 Mac instance and initialize with the signing key
            Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
            mac.init(signingKey);
            // compute the hmac on input data bytes
            byte[] rawHmac = mac.doFinal(data.getBytes());
            // base64-encode the hmac
            // result = new String(Base64.encodeBase64(rawHmac), "GBK");
            result = Base64.encodeToString(rawHmac, Base64.NO_WRAP);
        } catch (Exception e) {
            throw new SignatureException("Failed to generate HMAC : " + e);
        }
        return result;
    }
}

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