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PONode.js Hmac SHA256 base64 of string
 

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    <p>I'm making an app in java and a server with node and as an authentication method I would like to compare two strings. </p> <p>In java i'm doing this: </p> <pre><code>try { String secret = "secret"; String message = "Message"; Mac sha256_HMAC = Mac.getInstance("HmacSHA256"); SecretKeySpec secret_key = new SecretKeySpec(secret.getBytes(), "HmacSHA256"); sha256_HMAC.init(secret_key); String hash = Base64.encodeBase64String(sha256_HMAC.doFinal(message.getBytes())); System.out.println(hash); } catch (Exception e){ System.out.println("Error"); } </code></pre> <p>But I'm still pretty new to node.js and I'm trying to figure out how to do the same there. This is what I've got:</p> <pre><code>var crypto = require('crypto'); var sha256 = crypto.createHash('HMAC-SHA256').update('Message').digest("base64"); </code></pre> <p>How can I make them do the same? I'm still missing the salt in node.js. Suggestions?</p> <p><strong>EDIT:</strong> The answer below helped me find the solution. If other android users has this problem then this code worked for me:</p> <pre><code>try { String secret = "secret"; String message = "Message"; Mac sha256_HMAC = Mac.getInstance("HmacSHA256"); SecretKeySpec secret_key = new SecretKeySpec(secret.getBytes(), "HmacSHA256"); sha256_HMAC.init(secret_key); byte[] s53 = sha256_HMAC.doFinal(message.getBytes()); String hash = Base64.encodeToString(s53, Base64.DEFAULT); Log.e("beadict", hash); } catch (Exception e){ System.out.println("Error"); } </code></pre> <p>And this in node: </p> <pre><code>var crypto = require('crypto'); var hash = crypto.createHmac('SHA256', "secret").update("Message").digest('base64'); </code></pre>
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    1. COOne nit to pick - I recommend that you specify the character encoding in the Java `getBytes()` calls. While the Android default is UTF-8 (see http://developer.android.com/reference/java/nio/charset/Charset.html#defaultCharset() ) it doesn't hurt to be explicit, especially if the hash is to be generated on different machines. That said, I am not 100% sure what the node equivalent/default is. Point being, if the String -> byte[] encodings do not match, neither will the resulting hashes.
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