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package com.ksyun.api.sdk.auth;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import com.ksyun.api.sdk.utils.Base64Helper;

public class ShaHmac1 implements ISigner {
	
	private final static String AGLORITHM_NAME = "HmacSHA1";
	
	public String signString(String source, String accessSecret)
		throws InvalidKeyException, IllegalStateException {
		try {
			Mac mac = Mac.getInstance(AGLORITHM_NAME);
			mac.init(new SecretKeySpec(
					accessSecret.getBytes(KscURLEncoder.URL_ENCODING),AGLORITHM_NAME));
			byte[] signData = mac.doFinal(source.getBytes(KscURLEncoder.URL_ENCODING));
			return Base64Helper.encode(signData);
		} catch (NoSuchAlgorithmException e) {
			throw new RuntimeException("HMAC-SHA1 not supported.");
		} catch (UnsupportedEncodingException e) {
			throw new RuntimeException("UTF-8 not supported.");
		}
        
	}

	public String getSignerName() {
		return "HMAC-SHA1";
	}

	public String getSignerVersion() {
		return "1.0";
	}
}