diff --git a/sample/sample-ecdsa.html b/sample/sample-ecdsa.html
index 0e10ba7f..f8b375d2 100755
--- a/sample/sample-ecdsa.html
+++ b/sample/sample-ecdsa.html
@@ -84,6 +84,7 @@ <h4>(Step1) choose supported EC curve name and generate key pair</h4>
 <option value="secp256r1">secp256r1 (= NIST P-256, P-256, prime256v1)
 <option value="secp256k1">secp256k1
 <option value="secp384r1">secp384r1 (= NIST P-384, P-384)
+<option value="secp521r1">secp521r1 (= NIST P-521, P-521)
 </select><br/>
 <input type="button" value="generate EC key pair" onClick="doGenerate();"/><br/>
 <p>
diff --git a/src/asn1x509-1.0.js b/src/asn1x509-1.0.js
index 837e7a4c..362b4348 100644
--- a/src/asn1x509-1.0.js
+++ b/src/asn1x509-1.0.js
@@ -4162,6 +4162,7 @@ KJUR.asn1.x509.OID = new function(params) {
         'secp256r1':            '1.2.840.10045.3.1.7',
         'secp256k1':            '1.3.132.0.10',
         'secp384r1':            '1.3.132.0.34',
+        'secp521r1':            '1.3.132.0.35',
 
         'pkcs5PBES2':           '1.2.840.113549.1.5.13',
         'pkcs5PBKDF2':          '1.2.840.113549.1.5.12',
diff --git a/src/crypto-1.1.js b/src/crypto-1.1.js
index 18d0d20d..7f251470 100644
--- a/src/crypto-1.1.js
+++ b/src/crypto-1.1.js
@@ -1012,6 +1012,7 @@ KJUR.crypto.Mac = function(params) {
  * <li>secp256k1</li>
  * <li>secp256r1, NIST P-256, P-256, prime256v1</li>
  * <li>secp384r1, NIST P-384, P-384</li>
+ * <li>secp521r1, NIST P-521, P-521</li>
  * </ul>
  * NOTE1: DSA signing algorithm is also supported since crypto 1.1.5.
  * <h4>EXAMPLES</h4>
@@ -1512,8 +1513,8 @@ KJUR.crypto.OID = new function() {
 	'2b8104001f': 'secp192k1',
 	'2b81040021': 'secp224r1',
 	'2b8104000a': 'secp256k1',
-	'2b81040023': 'secp521r1',
 	'2b81040022': 'secp384r1',
+	'2b81040023': 'secp521r1',
 	'2a8648ce380403': 'SHA1withDSA', // 1.2.840.10040.4.3
 	'608648016503040301': 'SHA224withDSA', // 2.16.840.1.101.3.4.3.1
 	'608648016503040302': 'SHA256withDSA', // 2.16.840.1.101.3.4.3.2
diff --git a/src/ecdsa-modified-1.0.js b/src/ecdsa-modified-1.0.js
index 6eeff5e8..25f5d26f 100644
--- a/src/ecdsa-modified-1.0.js
+++ b/src/ecdsa-modified-1.0.js
@@ -39,6 +39,7 @@ if (typeof KJUR.crypto == "undefined" || !KJUR.crypto) KJUR.crypto = {};
  * <li>secp256r1, NIST P-256, P-256, prime256v1 (*)</li>
  * <li>secp256k1 (*)</li>
  * <li>secp384r1, NIST P-384, P-384 (*)</li>
+ * <li>secp521r1, NIST P-521, P-521 (*)</li>
  * </ul>
  * </p>
  */
@@ -134,7 +135,7 @@ KJUR.crypto.ECDSA = function(params) {
 	if (h.substr(0, 2) !== "04")
 	    throw "this method supports uncompressed format(04) only";
 
-	var charlen = this.ecparams.keylen / 4;
+	var charlen = this.ecparams.keycharlen;
 	if (h.length !== 2 + charlen * 2)
 	    throw "malformed public key hex length";
 
@@ -162,6 +163,8 @@ KJUR.crypto.ECDSA = function(params) {
 	    return "P-256";
 	if (s === "secp384r1" || s === "NIST P-384" || s === "P-384")
 	    return "P-384";
+	if (s === "secp521r1" || s === "NIST P-521" || s === "P-521")
+	    return "P-521";
 	return null;
     };
 
@@ -181,21 +184,37 @@ KJUR.crypto.ECDSA = function(params) {
     this.generateKeyPairHex = function() {
 	var biN = this.ecparams['n'];
 	var biPrv = this.getBigRandom(biN);
-	var epPub = this.ecparams['G'].multiply(biPrv);
-	var biX = epPub.getX().toBigInteger();
-	var biY = epPub.getY().toBigInteger();
-
-	var charlen = this.ecparams['keylen'] / 4;
+	var charlen = this.ecparams.keycharlen;
 	var hPrv = ("0000000000" + biPrv.toString(16)).slice(- charlen);
-	var hX   = ("0000000000" + biX.toString(16)).slice(- charlen);
-	var hY   = ("0000000000" + biY.toString(16)).slice(- charlen);
-	var hPub = "04" + hX + hY;
-
 	this.setPrivateKeyHex(hPrv);
-	this.setPublicKeyHex(hPub);
+	hPub = this.generatePublicKeyHex();
 	return {'ecprvhex': hPrv, 'ecpubhex': hPub};
     };
 
+	/**
+     * generate public key for EC private key
+     * @name generatePublicKeyHex
+     * @memberOf KJUR.crypto.ECDSA#
+     * @function
+     * @return {String} associative array of hexadecimal string of private and public key
+     * @example
+     * var ec = new KJUR.crypto.ECDSA({'curve': 'secp256r1', 'prv': prvHex});
+     * var pubhex = ec.generatePublicKeyHex(); // hexadecimal string of EC public key
+     * var pub ec.getPublicKeyXYHex() &rarr; { x: '01bacf...', y: 'c3bc22...' }
+     */
+	this.generatePublicKeyHex = function() {
+		var biPrv = new _BigInteger(this.prvKeyHex, 16);
+		var epPub = this.ecparams['G'].multiply(biPrv);
+		var biX = epPub.getX().toBigInteger();
+		var biY = epPub.getY().toBigInteger();
+		var charlen = this.ecparams.keycharlen;;
+		var hX   = ("0000000000" + biX.toString(16)).slice(- charlen);
+		var hY   = ("0000000000" + biY.toString(16)).slice(- charlen);
+		var hPub = "04" + hX + hY;
+		this.setPublicKeyHex(hPub);
+		return hPub;
+	}
+
     this.signWithMessageHash = function(hashHex) {
 	return this.signHex(hashHex, this.prvKeyHex);
     };
@@ -218,7 +237,7 @@ KJUR.crypto.ECDSA = function(params) {
 	var n = this.ecparams['n'];
 
 	// message hash is truncated with curve key length (FIPS 186-4 6.4)
-        var e = new _BigInteger(hashHex.substring(0, this.ecparams.keylen / 4), 16);
+        var e = new _BigInteger(hashHex.substring(0, this.ecparams.keycharlen), 16);
 
 	do {
 	    var k = this.getBigRandom(n);
@@ -277,7 +296,7 @@ KJUR.crypto.ECDSA = function(params) {
 	    var Q = _ECPointFp.decodeFromHex(this.ecparams['curve'], pubkeyHex);
 
 	    // message hash is truncated with curve key length (FIPS 186-4 6.4)
-            var e = new _BigInteger(hashHex.substring(0, this.ecparams.keylen / 4), 16);
+            var e = new _BigInteger(hashHex.substring(0, this.ecparams.keycharlen), 16);
 
 	    return this.verifyRaw(e, r, s, Q);
 	} catch (ex) {
@@ -846,10 +865,12 @@ KJUR.crypto.ECDSA.getName = function(s) {
     if (s === "2b8104000a") return "secp256k1"; // 1.3.132.0.10
     if (s === "2b81040021") return "secp224r1"; // 1.3.132.0.33
     if (s === "2b81040022") return "secp384r1"; // 1.3.132.0.34
+	if (s === "2b81040023") return "secp521r1"; // 1.3.132.0.35
     if ("|secp256r1|NIST P-256|P-256|prime256v1|".indexOf(s) !== -1) return "secp256r1";
     if ("|secp256k1|".indexOf(s) !== -1) return "secp256k1";
     if ("|secp224r1|NIST P-224|P-224|".indexOf(s) !== -1) return "secp224r1";
     if ("|secp384r1|NIST P-384|P-384|".indexOf(s) !== -1) return "secp384r1";
+	if ("|secp521r1|NIST P-521|P-521|".indexOf(s) !== -1) return "secp521r1";
     return null;
 };
 
diff --git a/src/ecparam-1.0.js b/src/ecparam-1.0.js
index dc11320c..eca5e57c 100644
--- a/src/ecparam-1.0.js
+++ b/src/ecparam-1.0.js
@@ -107,6 +107,7 @@ KJUR.crypto.ECParameterDB = new function() {
         var G = curve.decodePointHex("04" + gxHex + gyHex);
 	db[name]['name'] = name;
 	db[name]['keylen'] = keylen;
+  db[name]['keycharlen'] = Math.ceil(keylen / 8) * 2; // for P-521
         db[name]['curve'] = curve;
         db[name]['G'] = G;
         db[name]['n'] = n;
@@ -242,7 +243,7 @@ KJUR.crypto.ECParameterDB.regist(
   "051953EB9618E1C9A1F929A21A0B68540EEA2DA725B99B315F3B8B489918EF109E156193951EC7E937B1652C0BD3BB1BF073573DF883D2C34F1EF451FD46B503F00", // b
   "1FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386409", // n
   "1", // h
-  "C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66", // gx
+  "00C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66", // gx
   "011839296a789a3bc0045c8a5fb42c7d1bd998f54449579b446817afbd17273e662c97ee72995ef42640c550b9013fad0761353c7086a272c24088be94769fd16650", // gy
   ["NIST P-521", "P-521"]); // alias
 
diff --git a/src/keyutil-1.0.js b/src/keyutil-1.0.js
index 64a0dad6..3a769936 100644
--- a/src/keyutil-1.0.js
+++ b/src/keyutil-1.0.js
@@ -1238,7 +1238,7 @@ KEYUTIL.getKey = function(param, passcode, hextype) {
  * NOTE1: As for RSA algoirthm, public exponent has fixed
  * value '0x10001'.
  * NOTE2: As for EC algorithm, supported names of curve are
- * secp256r1, secp256k1 and secp384r1.
+ * secp256r1, secp256k1, secp384r1 and secp521r1.
  * NOTE3: DSA is not supported yet.
  * @example
  * var rsaKeypair = KEYUTIL.generateKeypair("RSA", 1024);
diff --git a/test/ecc-testvectors.js b/test/ecc-testvectors.js
new file mode 100644
index 00000000..9cd39381
--- /dev/null
+++ b/test/ecc-testvectors.js
@@ -0,0 +1,635 @@
+// testvectors from http://point-at-infinity.org/ecc/nisttv
+const ECC_TESTVECTORS = {
+    "secp256r1": [
+        {   "k": "1",
+            "x": "6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296",
+            "y": "4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5",
+        },
+        {   "k": "2",
+            "x": "7CF27B188D034F7E8A52380304B51AC3C08969E277F21B35A60B48FC47669978",
+            "y": "07775510DB8ED040293D9AC69F7430DBBA7DADE63CE982299E04B79D227873D1",
+        },
+        {   "k": "3",
+            "x": "5ECBE4D1A6330A44C8F7EF951D4BF165E6C6B721EFADA985FB41661BC6E7FD6C",
+            "y": "8734640C4998FF7E374B06CE1A64A2ECD82AB036384FB83D9A79B127A27D5032",
+        },
+        {   "k": "4",
+            "x": "E2534A3532D08FBBA02DDE659EE62BD0031FE2DB785596EF509302446B030852",
+            "y": "E0F1575A4C633CC719DFEE5FDA862D764EFC96C3F30EE0055C42C23F184ED8C6",
+        },
+        {   "k": "5",
+            "x": "51590B7A515140D2D784C85608668FDFEF8C82FD1F5BE52421554A0DC3D033ED",
+            "y": "E0C17DA8904A727D8AE1BF36BF8A79260D012F00D4D80888D1D0BB44FDA16DA4",
+        },
+        {   "k": "6",
+            "x": "B01A172A76A4602C92D3242CB897DDE3024C740DEBB215B4C6B0AAE93C2291A9",
+            "y": "E85C10743237DAD56FEC0E2DFBA703791C00F7701C7E16BDFD7C48538FC77FE2",
+        },
+        {   "k": "7",
+            "x": "8E533B6FA0BF7B4625BB30667C01FB607EF9F8B8A80FEF5B300628703187B2A3",
+            "y": "73EB1DBDE03318366D069F83A6F5900053C73633CB041B21C55E1A86C1F400B4",
+        },
+        {   "k": "8",
+            "x": "62D9779DBEE9B0534042742D3AB54CADC1D238980FCE97DBB4DD9DC1DB6FB393",
+            "y": "AD5ACCBD91E9D8244FF15D771167CEE0A2ED51F6BBE76A78DA540A6A0F09957E",
+        },
+        {   "k": "9",
+            "x": "EA68D7B6FEDF0B71878938D51D71F8729E0ACB8C2C6DF8B3D79E8A4B90949EE0",
+            "y": "2A2744C972C9FCE787014A964A8EA0C84D714FEAA4DE823FE85A224A4DD048FA",
+        },
+        {   "k": "10",
+            "x": "CEF66D6B2A3A993E591214D1EA223FB545CA6C471C48306E4C36069404C5723F",
+            "y": "878662A229AAAE906E123CDD9D3B4C10590DED29FE751EEECA34BBAA44AF0773",
+        },
+        {   "k": "11",
+            "x": "3ED113B7883B4C590638379DB0C21CDA16742ED0255048BF433391D374BC21D1",
+            "y": "9099209ACCC4C8A224C843AFA4F4C68A090D04DA5E9889DAE2F8EEFCE82A3740",
+        },
+        {   "k": "12",
+            "x": "741DD5BDA817D95E4626537320E5D55179983028B2F82C99D500C5EE8624E3C4",
+            "y": "0770B46A9C385FDC567383554887B1548EEB912C35BA5CA71995FF22CD4481D3",
+        },
+        {   "k": "13",
+            "x": "177C837AE0AC495A61805DF2D85EE2FC792E284B65EAD58A98E15D9D46072C01",
+            "y": "63BB58CD4EBEA558A24091ADB40F4E7226EE14C3A1FB4DF39C43BBE2EFC7BFD8",
+        },
+        {   "k": "14",
+            "x": "54E77A001C3862B97A76647F4336DF3CF126ACBE7A069C5E5709277324D2920B",
+            "y": "F599F1BB29F4317542121F8C05A2E7C37171EA77735090081BA7C82F60D0B375",
+        },
+        {   "k": "15",
+            "x": "F0454DC6971ABAE7ADFB378999888265AE03AF92DE3A0EF163668C63E59B9D5F",
+            "y": "B5B93EE3592E2D1F4E6594E51F9643E62A3B21CE75B5FA3F47E59CDE0D034F36",
+        },
+        {   "k": "16",
+            "x": "76A94D138A6B41858B821C629836315FCD28392EFF6CA038A5EB4787E1277C6E",
+            "y": "A985FE61341F260E6CB0A1B5E11E87208599A0040FC78BAA0E9DDD724B8C5110",
+        },
+        {   "k": "17",
+            "x": "47776904C0F1CC3A9C0984B66F75301A5FA68678F0D64AF8BA1ABCE34738A73E",
+            "y": "AA005EE6B5B957286231856577648E8381B2804428D5733F32F787FF71F1FCDC",
+        },
+        {   "k": "18",
+            "x": "1057E0AB5780F470DEFC9378D1C7C87437BB4C6F9EA55C63D936266DBD781FDA",
+            "y": "F6F1645A15CBE5DC9FA9B7DFD96EE5A7DCC11B5C5EF4F1F78D83B3393C6A45A2",
+        },
+        {   "k": "19",
+            "x": "CB6D2861102C0C25CE39B7C17108C507782C452257884895C1FC7B74AB03ED83",
+            "y": "58D7614B24D9EF515C35E7100D6D6CE4A496716E30FA3E03E39150752BCECDAA",
+        },
+        {   "k": "20",
+            "x": "83A01A9378395BAB9BCD6A0AD03CC56D56E6B19250465A94A234DC4C6B28DA9A",
+            "y": "76E49B6DE2F73234AE6A5EB9D612B75C9F2202BB6923F54FF8240AAA86F640B8",
+        },
+        {   "k": "112233445566778899",
+            "x": "339150844EC15234807FE862A86BE77977DBFB3AE3D96F4C22795513AEAAB82F",
+            "y": "B1C14DDFDC8EC1B2583F51E85A5EB3A155840F2034730E9B5ADA38B674336A21",
+        },
+        {   "k": "112233445566778899112233445566778899",
+            "x": "1B7E046A076CC25E6D7FA5003F6729F665CC3241B5ADAB12B498CD32F2803264",
+            "y": "BFEA79BE2B666B073DB69A2A241ADAB0738FE9D2DD28B5604EB8C8CF097C457B",
+        },
+        {   "k": "29852220098221261079183923314599206100666902414330245206392788703677545185283",
+            "x": "9EACE8F4B071E677C5350B02F2BB2B384AAE89D58AA72CA97A170572E0FB222F",
+            "y": "1BBDAEC2430B09B93F7CB08678636CE12EAAFD58390699B5FD2F6E1188FC2A78",
+        },
+        {   "k": "57896042899961394862005778464643882389978449576758748073725983489954366354431",
+            "x": "878F22CC6DB6048D2B767268F22FFAD8E56AB8E2DC615F7BD89F1E350500DD8D",
+            "y": "714A5D7BB901C9C5853400D12341A892EF45D87FC553786756C4F0C9391D763E",
+        },
+        {   "k": "1766845392945710151501889105729049882997660004824848915955419660366636031",
+            "x": "659A379625AB122F2512B8DADA02C6348D53B54452DFF67AC7ACE4E8856295CA",
+            "y": "49D81AB97B648464D0B4A288BD7818FAB41A16426E943527C4FED8736C53D0F6",
+        },
+        {   "k": "28948025760307534517734791687894775804466072615242963443097661355606862201087",
+            "x": "CBCEAAA8A4DD44BBCE58E8DB7740A5510EC2CB7EA8DA8D8F036B3FB04CDA4DE4",
+            "y": "4BD7AA301A80D7F59FD983FEDBE59BB7B2863FE46494935E3745B360E32332FA",
+        },
+        {   "k": "113078210460870548944811695960290644973229224625838436424477095834645696384",
+            "x": "F0C4A0576154FF3A33A3460D42EAED806E854DFA37125221D37935124BA462A4",
+            "y": "5B392FA964434D29EEC6C9DBC261CF116796864AA2FAADB984A2DF38D1AEF7A3",
+        },
+        {   "k": "12078056106883488161242983286051341125085761470677906721917479268909056",
+            "x": "5E6C8524B6369530B12C62D31EC53E0288173BD662BDF680B53A41ECBCAD00CC",
+            "y": "447FE742C2BFEF4D0DB14B5B83A2682309B5618E0064A94804E9282179FE089F",
+        },
+        {   "k": "57782969857385448082319957860328652998540760998293976083718804450708503920639",
+            "x": "03792E541BC209076A3D7920A915021ECD396A6EB5C3960024BE5575F3223484",
+            "y": "FC774AE092403101563B712F68170312304F20C80B40C06282063DB25F268DE4",
+        },
+        {   "k": "57896017119460046759583662757090100341435943767777707906455551163257755533312",
+            "x": "2379FF85AB693CDF901D6CE6F2473F39C04A2FE3DCD842CE7AAB0E002095BCF8",
+            "y": "F8B476530A634589D5129E46F322B02FBC610A703D80875EE70D7CE1877436A1",
+        },
+        {   "k": "452312848374287284681282171017647412726433684238464212999305864837160993279",
+            "x": "C1E4072C529BF2F44DA769EFC934472848003B3AF2C0F5AA8F8DDBD53E12ED7C",
+            "y": "39A6EE77812BB37E8079CD01ED649D3830FCA46F718C1D3993E4A591824ABCDB",
+        },
+        {   "k": "904571339174065134293634407946054000774746055866917729876676367558469746684",
+            "x": "34DFBC09404C21E250A9B40FA8772897AC63A094877DB65862B61BD1507B34F3",
+            "y": "CF6F8A876C6F99CEAEC87148F18C7E1E0DA6E165FFC8ED82ABB65955215F77D3",
+        },
+        {   "k": "115792089210356248762697446949407573529996955224135760342422259061068512044349",
+            "x": "83A01A9378395BAB9BCD6A0AD03CC56D56E6B19250465A94A234DC4C6B28DA9A",
+            "y": "891B64911D08CDCC5195A14629ED48A360DDFD4596DC0AB007DBF5557909BF47",
+        },
+        {   "k": "115792089210356248762697446949407573529996955224135760342422259061068512044350",
+            "x": "CB6D2861102C0C25CE39B7C17108C507782C452257884895C1FC7B74AB03ED83",
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diff --git a/test/qunit-do-ecdsamod-s.html b/test/qunit-do-ecdsamod-s.html
index 5c1cf3e4..222ecd9a 100755
--- a/test/qunit-do-ecdsamod-s.html
+++ b/test/qunit-do-ecdsamod-s.html
@@ -61,7 +61,7 @@
 
 <b>NOTE:</b>
 <p>
-Currently this library works for only secp256r1, secp256k1 and secp384r1 EC curves
+Currently this library works for only secp256r1, secp256k1, secp384r1 and secp521 EC curves
 besides some other curves are pre-defined.
 </p>
 
diff --git a/test/qunit-do-ecdsamod-unsupport.html b/test/qunit-do-ecdsamod-unsupport.html
index 24833682..513f74fa 100755
--- a/test/qunit-do-ecdsamod-unsupport.html
+++ b/test/qunit-do-ecdsamod-unsupport.html
@@ -32,6 +32,7 @@
 <script src="../ext/ec.js"></script>
 <script src="../ext/ec-patch.js"></script>
 
+<script src="../src/base64x-1.1.js"></script>
 <script src="../src/asn1hex-1.1.js"></script>
 <script src="../src/asn1-1.0.js"></script>
 <script src="../src/crypto-1.1.js"></script>
@@ -81,7 +82,7 @@
 
 <b>NOTE:</b>
 <p>
-Currently this library works for only secp256r1, secp256k1 and secp384r1 EC curves
+Currently this library works for only secp256r1, secp256k1, secp384r1 and secp521 EC curves
 besides some other curves are pre-defined.
 </p>
 
diff --git a/test/qunit-do-ecdsamod.html b/test/qunit-do-ecdsamod.html
index 2ea270ff..08567cf5 100755
--- a/test/qunit-do-ecdsamod.html
+++ b/test/qunit-do-ecdsamod.html
@@ -32,12 +32,15 @@
 <script src="../ext/ec.js"></script>
 <script src="../ext/ec-patch.js"></script>
 
+<script src="../src/base64x-1.1.js"></script>
 <script src="../src/asn1hex-1.1.js"></script>
 <script src="../src/asn1-1.0.js"></script>
 <script src="../src/crypto-1.1.js"></script>
 <script src="../src/ecdsa-modified-1.0.js"></script>
 <script src="../src/ecparam-1.0.js"></script>
 
+<script src="ecc-testvectors.js"></script>
+
 <script type="text/javascript">
 $(document).ready(function(){
 
@@ -127,6 +130,40 @@
 var ECK1PUBP8HEX = "3059301306072a8648ce3d020106082a8648ce3d03010703420004a01532a3c0900053de60fbefefcca58793301598d308b41e6f4e364e388c2711bef432c599148c94143d4ff46c2cb73e3e6a41d7eef23c047ea11e60667de425"; // k1.pub.der
 var ECK1CERTHEX = "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"; // k1.self.cer.der
 
+function checkTestVector(curve, tv) {
+    var biPrv = new BigInteger(tv.k, 10);
+    equal(tv.k, biPrv.toString(10), "k=" + tv.k);
+
+    var biX = new BigInteger(tv.x, 16);
+    var biY = new BigInteger(tv.y, 16);
+
+    var ec = new KJUR.crypto.ECDSA({curve: curve, prv: biPrv.toString(16) });
+    ec.generatePublicKeyHex();
+    var pub = ec.getPublicKeyXYHex();
+    var biPubX = new BigInteger(pub.x, 16);
+    var biPubY = new BigInteger(pub.y, 16);
+    equal(biX.toString(16), biPubX.toString(16), "X with k=" + tv.k);
+    equal(biY.toString(16), biPubY.toString(16), "Y with k=" + tv.k);
+}
+
+test("generatePublicKey (secp256r1)", function() {
+  for (var i=0; i<ECC_TESTVECTORS.secp256r1.length; i++) {
+    checkTestVector("secp256r1", ECC_TESTVECTORS.secp256r1[i]);
+  }
+});
+
+test("generatePublicKey (secp384r1)", function() {
+  for (var i=0; i<ECC_TESTVECTORS.secp384r1.length; i++) {
+    checkTestVector("secp384r1", ECC_TESTVECTORS.secp384r1[i]);
+  }
+});
+
+test("generatePublicKey (secp521r1)", function() {
+  for (var i=0; i<ECC_TESTVECTORS.secp521r1.length; i++) {
+    checkTestVector("secp521r1", ECC_TESTVECTORS.secp521r1[i]);
+  }
+});
+
 test("default(secp256r1) sign and verify aaa", function() {
   // signing a message
   var prv = "11b5737cf9d93f17c0cb1a84655d3995a02824097effa5edd8ee26381eb5d6c3";
@@ -216,6 +253,15 @@
   equal(keypair['ecpubhex'].length, (384 / 4) * 2 + 2, "public key hexstr length");
 });
 
+test("generate ECC key for secp521r1 curve", function() {
+  var ec = new KJUR.crypto.ECDSA({"curve": "secp521r1"});
+  var keypair = ec.generateKeyPairHex();
+
+  expect(2);
+  equal(keypair['ecprvhex'].length, Math.ceil(521 / 8) * 2, "private key hexstr length");
+  equal(keypair['ecpubhex'].length, (Math.ceil(521 / 8) * 2) * 2 + 2, "public key hexstr length");
+});
+
 test("key generation, signing and verification for secp256r1 curve", function() {
   // key generation
   var ec0 = new KJUR.crypto.ECDSA({'curve': 'secp256r1'});
@@ -231,6 +277,36 @@
   equal(result2, true, "ecdsa sign");
 });
 
+test("key generation, signing and verification for secp384r1 curve", function() {
+  // key generation
+  var ec0 = new KJUR.crypto.ECDSA({'curve': 'secp384r1'});
+  var keypair = ec0.generateKeyPairHex();
+
+  // signing
+  var ec1 = new KJUR.crypto.ECDSA({'curve': 'secp384r1'});
+  var sigHex = ec1.signHex(hashAAA256Hex, keypair.ecprvhex);
+
+  // signature validation
+  var ec2 = new KJUR.crypto.ECDSA({'curve': 'secp384r1'});
+  var result2 = ec2.verifyHex(hashAAA256Hex, sigHex, keypair.ecpubhex);
+  equal(result2, true, "ecdsa sign");
+});
+
+test("key generation, signing and verification for secp521r1 curve", function() {
+  // key generation
+  var ec0 = new KJUR.crypto.ECDSA({'curve': 'secp521r1'});
+  var keypair = ec0.generateKeyPairHex();
+
+  // signing
+  var ec1 = new KJUR.crypto.ECDSA({'curve': 'secp521r1'});
+  var sigHex = ec1.signHex(hashAAA256Hex, keypair.ecprvhex);
+
+  // signature validation
+  var ec2 = new KJUR.crypto.ECDSA({'curve': 'secp521r1'});
+  var result2 = ec2.verifyHex(hashAAA256Hex, sigHex, keypair.ecpubhex);
+  equal(result2, true, "ecdsa sign");
+});
+
 test("getPublicKeyXYHex() method test", function() {
   var ec1 = new KJUR.crypto.ECDSA({'curve': 'secp256r1', 'pub': ECK1PUBHEX});
   var xy = ec1.getPublicKeyXYHex();
@@ -294,7 +370,7 @@
 
 <b>NOTE:</b>
 <p>
-Currently this library works for only secp256r1, secp256k1 and secp384r1 EC curves
+Currently this library works for only secp256r1, secp256k1, secp384r1 and secp521 EC curves
 besides some other curves are pre-defined.
 </p>
 
diff --git a/test/qunit-do-ecparam.html b/test/qunit-do-ecparam.html
index 00768e44..f6906640 100755
--- a/test/qunit-do-ecparam.html
+++ b/test/qunit-do-ecparam.html
@@ -32,6 +32,7 @@
 <script src="../ext/ec.js"></script>
 <script src="../ext/ec-patch.js"></script>
 
+<script src="../src/base64x-1.1.js"></script>
 <script src="../src/asn1hex-1.1.js"></script>
 <script src="../src/asn1-1.0.js"></script>
 <script src="../src/crypto-1.1.js"></script>
@@ -43,13 +44,34 @@
 
 test("ECParameterDB NIST P-256", function() {
   var db = KJUR.crypto.ECParameterDB;
-  expect(5);
+  expect(6);
   equal(typeof db.getByName("secp256r1"), "object", "secp256r1 defined");
   equal(typeof db.getByName("NIST P-256"), "object", "alias NIST P-256 defined");
   equal(typeof db.getByName("P-256"), "object", "alias P-256 defined");
   equal(typeof db.getByName("prime256v1"), "object", "alias prime256v1 defined");
   var ecparam = db.getByName("prime256v1");
   equal(ecparam['n'].toString(16), "ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551", "prime256v1:n = ");
+  equal(ecparam.keycharlen, 64, "prime256v1:keycharlen = ");
+});
+
+test("ECParameterDB NIST P-384", function() {
+  var db = KJUR.crypto.ECParameterDB;
+  expect(4);
+  equal(typeof db.getByName("secp384r1"), "object", "secp384r1 defined");
+  equal(typeof db.getByName("NIST P-384"), "object", "alias NIST P-384 defined");
+  equal(typeof db.getByName("P-384"), "object", "alias P-384 defined");
+  var ecparam = db.getByName("secp384r1");
+  equal(ecparam.keycharlen, 96, "secp384r1:keycharlen = ");
+});
+
+test("ECParameterDB NIST P-521", function() {
+  var db = KJUR.crypto.ECParameterDB;
+  expect(4);
+  equal(typeof db.getByName("secp521r1"), "object", "secp521r1 defined");
+  equal(typeof db.getByName("NIST P-521"), "object", "alias NIST P-521 defined");
+  equal(typeof db.getByName("P-521"), "object", "alias P-521 defined");
+  var ecparam = db.getByName("secp521r1");
+  equal(ecparam.keycharlen, 132, "secp521r1:keycharlen = ");
 });
 
 });