PHP と Android のハッシュ化させた文字列を比較させる時の覚書き。【追記】折角なので Javascript 版も追加しておいた

conv.java

public static String sample_conv(String arg_target, String arg_password){

	try {
		Mac mac = Mac.getInstance("HmacSHA256");
		SecretKeySpec secret = new SecretKeySpec(arg_password.getBytes("UTF-8"), mac.getAlgorithm());
		mac.init(secret);
		byte[] digest = mac.doFinal(arg_target.getBytes("UTF-8"));

		String hashed_hex = bin2hex(digest);		
		return Base64.encodeToString(hashed_hex.getBytes("UTF-8"), Base64.DEFAULT).replace("\n", "");
	}
	catch (InvalidKeyException e)          { e.printStackTrace();}
	catch (NoSuchAlgorithmException e)     { e.printStackTrace();}
	catch (UnsupportedEncodingException e) { e.printStackTrace();}
	
	return "";
}    

/**
 * バイト文字を 16 進数文字列に変換する
 * 
 * @param   data
 * @author  y.k
 * @version 1.0
 */
public static String bin2hex(byte[] data) {
	StringBuffer sb = new StringBuffer();
	for (byte b : data) {
		String s = Integer.toHexString(0xff & b);
		if (s.length() == 1) { sb.append("0"); }
		sb.append(s);
	}
	return sb.toString();
}

conv.js

<script type="text/javascript">
<!--
/**
 *  ライブラリを利用している
 *  jssha256  : http://point-at-infinity.org/jssha256/
 *  js-base64 : https://github.com/dankogai/js-base64
 */
function sample_conv(target, password){
	var mac_hex   = HMAC_SHA256_MAC(password, target);
	var signature = Base64.encode(mac_hex);
	return signature;
}
// -->
</script>

conv.php

<?php
function sample_conv($arg_target, $arg_password){
	$myHash = hash_hmac('sha256', $arg_target, $arg_password, false);
	return base64_encode($myHash);
}
?>