<SignedInfo><CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" /><SignatureMethod Algorithm="urn:ietf:params:xml:ns:cpxmlsec:algorithms:gostr34102001-gostr3411" /><Reference URI=""><Transforms><Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116"><XPath xmlns:dsig="http://www.w3.org/2000/09/xmldsig#">not(ancestor-or-self::dsig:Signature)</XPath></Transform></Transforms><DigestMethod Algorithm="urn:ietf:params:xml:ns:cpxmlsec:algorithms:gostr3411" /><DigestValue>wMqeedhkBl4FMJ3bjYZjwLFdkwOsK/a0AaNjt+o+pxk=</DigestValue></Reference></SignedInfo>

public String GenerateSignedInfoHash()
        {
            //исходный signedInfo. кавычки экранированы символами \
            string signedInfo =   "<SignedInfo><CanonicalizationMethod Algorithm=\"http://www.w3.org/TR/2001/REC-xml-c14n-20010315\" /><SignatureMethod Algorithm=\"urn:ietf:params:xml:ns:cpxmlsec:algorithms:gostr34102001-gostr3411\" /><Reference URI=\"\"><Transforms><Transform Algorithm=\"http://www.w3.org/TR/1999/REC-xpath-19991116\"><XPath xmlns:dsig=\"http://www.w3.org/2000/09/xmldsig#\">not(ancestor-or-self::dsig:Signature)</XPath></Transform></Transforms><DigestMethod Algorithm=\"urn:ietf:params:xml:ns:cpxmlsec:algorithms:gostr3411\" /><DigestValue>wMqeedhkBl4FMJ3bjYZjwLFdkwOsK/a0AaNjt+o+pxk=</DigestValue></Reference></SignedInfo>";
            

            XmlDocument signedInfoXml = new XmlDocument();
            signedInfoXml.LoadXml(signedInfo);

            //выолняем канонизация
             XmlDsigC14NTransform xmlTransform = new XmlDsigC14NTransform(false);
             xmlTransform.Algorithm =SignedXml.XmlDsigC14NTransformUrl;
             xmlTransform.LoadInput(signedInfoXml);


            //получаемп хэш по госту
             HashAlgorithm myhash = HashAlgorithm.Create("GOST3411");
             byte[] hashResult =xmlTransform.GetDigestedOutput(myhash);
             string canonicalHashedSignedInfo = Convert.ToBase64String(hashResult);
             return canonicalHashedSignedInfo;
        }

//генерация SignatureValue
      function generateSignatureValue(base64Hash) {

            var oStore = CreateObject("CAPICOM.Store");
            oStore.Open(CAPICOM_CURRENT_USER_STORE, CAPICOM_MY_STORE, CAPICOM_STORE_OPEN_MAXIMUM_ALLOWED);



            try {
                var certificate = oStore.Certificates.Item(4);

                var hashObject = CreateObject("CAdESCOM.HashedData");
                hashObject.Algorithm = CADESCOM_HASH_ALGORITHM_CP_GOST_3411;
                var temp = utils.stringToHex(B64.decode(base64Hash));
                hashObject.Hash(temp);

                var rawSignature = CreateObject("CAdESCOM.RawSignature");
                var signatureHex = rawSignature.SignHash(hashObject, certificate);

                var reversedSignatureString = utils.reverse(utils.hexToString(signatureHex));

                return B64.encode(reversedSignatureString);

            } catch (e) {
                alert(e);
            }

        };


//вспомогательные функции

        var utils = {

            reverse: function (str) {
                var newStr = '', i;
                for (i = str.length - 1; i >= 0; i--) {
                    newStr += str.charAt(i);
                }
                return newStr;
            },

            d2h: function (d) {
                var res = d.toString(16).toUpperCase();
                if (res.length == 1) {
                    res = '0' + res;
                }
                return res;
            },
            h2d: function (h) {
                return parseInt(h, 16);
            },
            stringToHex: function (string) {
                var hex = '';

                for (var i = 0; i < string.length; i++) {
                    hex += this.d2h(string.charCodeAt(i));
                }
                return hex;
            },
            hexToString: function (hex) {
                var string = '';

                for (var b = 0; b < hex.length; b += 2) {
                    string += String.fromCharCode(parseInt(hex.substr(b, 2), 16));
                }

                return string;
            }
        };