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js_sdk/yushijie-ossutil/ossutil/hmac.js

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+const Crypto = require('./crypto.js');
+
+(function(){
+
+// Shortcut
+var util = Crypto.util;
+
+Crypto.HMAC = function (hasher, message, key, options) {
+
+	// Allow arbitrary length keys
+	key = key.length > hasher._blocksize * 4 ?
+	      hasher(key, { asBytes: true }) :
+	      util.stringToBytes(key);
+
+	// XOR keys with pad constants
+	var okey = key,
+	    ikey = key.slice(0);
+	for (var i = 0; i < hasher._blocksize * 4; i++) {
+		okey[i] ^= 0x5C;
+		ikey[i] ^= 0x36;
+	}
+
+	var hmacbytes = hasher(util.bytesToString(okey) +
+	                       hasher(util.bytesToString(ikey) + message, { asString: true }),
+	                       { asBytes: true });
+	return options && options.asBytes ? hmacbytes :
+	       options && options.asString ? util.bytesToString(hmacbytes) :
+	       util.bytesToHex(hmacbytes);
+
+};
+
+})();
+
+module.exports = Crypto;