C# | Tedds blog

Norwegian personal number verification in C#

Code to verify Norwegian personal number (personnummer / fødselsnummer) written in C#. Obeys 2013 standards as described in this Wikipedia article. Please let me know how if you find bugs / improvements. :)

public static class NorwegianPersonalNumberValidator
{
    // Implementation of Norwegian personal number verification based on specifications outlined on https://no.wikipedia.org/wiki/F%C3%B8dselsnummer
    // Version 1: 2016-12-07 Tedd Hansen, tedd@konge.net

    public class Result
    {
        public enum GenderType
        {
            Male,
            Female
        }

        [Flags]
        public enum NumberType
        {
            Normal = 0,
            D = 1,
            H = 2,
            DAndF = 3, // Not valid
            FH = 4,
            DAndFG = 5, // Not valid
            HAndFH = 6, // Not valid
            DAndHAndFH = 7 // Not valid
        }

        public bool Success { get; set; }
        public string ErrorMessage { get; set; }
        public GenderType Gender { get; set; }
        public NumberType Type { get; set; }
        public DateTime Birthday { get; set; }

        public override string ToString()
        {
            if (Success)
                return $"Success: {Success}, Birthday: {Birthday.ToString("yyyy'-'MM'-'dd")}, Gender: {Gender}, Type: {Type}";
            else
                return $"Success: {Success}, ErrorMessage: {ErrorMessage ?? "N/A"}";
        }
    }

    private struct IndividualNumberControlRange
    {
        public int From;
        public int To;
        public int FromYear;
        public int ToYear;
    }
    private static readonly IndividualNumberControlRange[] IndividualControlRange = new[] {
        new IndividualNumberControlRange() { From = 0,   To = 499, FromYear = 1900, ToYear = 1999 },
        new IndividualNumberControlRange() { From = 500, To = 749, FromYear = 1854, ToYear = 1899 },
        new IndividualNumberControlRange() { From = 500, To = 999, FromYear = 2000, ToYear = 2039 },
        new IndividualNumberControlRange() { From = 900, To = 999, FromYear = 1940, ToYear = 1999 },
    };

    private static Regex PersonalNumberRegex = new Regex(@"^(?<birthdate>(?<day>\d\d)(?<month>\d\d)(?<year>\d\d))(?<individual>\d\d(?<gender>\d))(?<checksum>\d\d)$");
    public static Result Validate(string number)
    {
        var result = new Result();
        // Is it the correct length?
        if (number == null || number.Length != 11)
            return new Result() { Success = false, ErrorMessage = "Feil lengde. Personnummer er 11 tall." };

        // Extract what we need
        var match = PersonalNumberRegex.Match(number);

        // Regex is only looking for 11 numbers, so we can assume any error is because there are non-numbers
        if (!match.Success)
            return new Result() { Success = false, ErrorMessage = "Personummer skal kun inneholde tall." };

        // Parse the numbers
        var day = int.Parse(match.Groups["day"].Value);
        var month = int.Parse(match.Groups["month"].Value);
        var year = int.Parse(match.Groups["year"].Value);
        var individual = int.Parse(match.Groups["individual"].Value);
        var gender = int.Parse(match.Groups["gender"].Value);
        var checksum = int.Parse(match.Groups["checksum"].Value);

        // Compensate for D-numbers
        if (day > 31)
        {
            result.Type |= Result.NumberType.D;
            day -= 40;
        }
        // Compensate for H-numbers
        if (month > 30)
        {
            result.Type |= Result.NumberType.H;
            month -= 40;
        }
        // Compensate for FH-numbers
        if (day >= 80)
        {
            result.Type |= Result.NumberType.FH;
            day = 1;
        }

        // Determine gender (not that we need it)
        result.Gender = gender % 2 != 0 ? Result.GenderType.Male : Result.GenderType.Female;

        int fullYear = 0;

        // Get the range based on the individual range
        var ranges = IndividualControlRange.Where(r => individual >= r.From && individual <= r.To).ToList();
        if (ranges == null || ranges.Count == 0)
            return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#3)" };

        foreach (var range in ranges)
        {
            // Get full year based on the range
            // Note that if there is a change to range so it crosses centuries then we need more checking here - or else the next check will fail
            var fYear = int.Parse(range.FromYear.ToString().Substring(0, 2) + year.ToString("D2"));

            // Check that we are within allowed range
            if (fYear >= range.FromYear && fYear <= range.ToYear)
            {
                fullYear = fYear;
                break;
            }
        }
        if (fullYear == 0)
            return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#4)" };

        // Have .Net verify the date, using ISO 8601 should be universally safe
        var iso8601Birthday = fullYear + "-" + month.ToString("D2") + "-" + day.ToString("D2");
        DateTime dtBirthday;
        if (!DateTime.TryParse(iso8601Birthday, out dtBirthday))
            return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#5)" };
        result.Birthday = dtBirthday;

        // And finally calculate and verify the two checksum digits at the end of the number
        // Convert personal number string to int array
        var n = number.Select(c => int.Parse(c.ToString())).ToArray();

        // Calculate checksum number 1
        int k1 = 11 - (3 * n[0] + 7 * n[1] + 6 * n[2] + 1 * n[3] + 8 * n[4] + 9 * n[5] + 4 * n[6] + 5 * n[7] + 2 * n[8]) % 11;
        if (k1 == 11) k1 = 0;

        if (k1 == 10 || k1 != n[9])
            return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#6)" };

        // Calculate checksum number 2
        int k2 = 11 - (5 * n[0] + 4 * n[1] + 3 * n[2] + 2 * n[3] + 7 * n[4] + 6 * n[5] + 5 * n[6] + 4 * n[7] + 3 * n[8] + 2 * k1) % 11;
        if (k2 == 11) k2 = 0;

        if (k2 == 10 || k2 != n[10])
            return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#7)" };

        result.Success = true;
        return result;
    }
}

void Main()
{
    // Test a whole lot of numbers...
    foreach (var pn in new[] { "11056027043", "01073703642", "11123434945", "19073120317", "02012526582", "01052304454", "28023727473", "07052739084", "03126320255", "13106215582", "07032425814", "26082416446", "15060238585", "30121408178", "27096212181", "23021347574", "20064234219", "15081024143", "26045230189", "10082000734", "02012048281", "20046647611", "29096114654", "10026402781", "06122615721", "17093725573", "04121422528", "04024403756", "20101229085", "19092040383", "23053739865", "24101534665", "12021509637", "29011203424", "18100810960", "22040112832", "18101938626", "16021315420", "18060835965", "26050311189", "27094110284", "21112531448", "28015703069", "21122141931", "30062121293", "10095324709", "03129788495", "19123924293", "24020317082", "26085821228", "26093737317", "29123535985", "29034704358", "05079764185", "11022315392", "01070615963", "19123122669", "21072401511", "22054406766", "09104338078", "18062248188", "30030827720", "30112309574", "13052429840", "18071235706", "21031838069", "27124620754", "06024248559", "03033029178", "23123301676", "02034006841", "21072007651", "02125218752", "09036030736", "17021721999", "08023716837", "30031710606", "08116344379", "27116322930", "15071437741", "17093343433", "13030820546", "13044940323", "07052826904", "04072204420", "19116213748", "23109866350", "05012118130", "21094016352", "25095110668", "11123630884", "01114934301", "10022530181", "19056102216", "06025612378", "24074641810", "01040326363", "03034908183", "13032149086", "02114412077", "18080406424", "17072630378", "04092334681", "29080604899", "25123841185", "10113841724", "12065136587", "06030310878", "22020526134", "13102022887", "11115532164", "02072342685", "28114002692", "29104548448", "28052326658", "18116435868", "27044618252", "22024417623", "23022628828", "26034940583", "06051220313", "11042224601", "07083106608", "09039858808", "20022534093", "13035932571", "07081439073", "08053604146", "07073128735", "26096220609", "31075807301", "03022413723", "07063723511", "26066222992", "06084708613", "23013117187", "29073019808", "24062118284", "16032844042", "15123629776", "14123902867", "16035907215", "07095638052", "11034806901", "22126334676", "05031049115", "30092903458", "20034734152", "11063819206", "25055243754", "27035620058", "21051146074", "20094511330", "05059959494", "16053718144", "04124348973", "19112526393", "15065744985", "04106439600", "10121512268", "11020023335", "08081519855", "05075030136", "07056207850", "11115902573", "02042847839", "16100324044", "06075042491", "21079891638", "18070849859", "01015033106", "19072248530", "12023702809", "27080408124", "18044930346", "22100127346", "16119888232", "27033837831", "04042622287", "14034120723", "15014131539", "20035421794", "18115548537", "23064702998", "02024939521", "24030549194", "28094723177", "12030246126", "28063144225", "08052621187", "01110836399", "19011233360", "20101138829", "11053336886", "12114423309", "10070343334", "14093948247", "07043538963", "28014503937", "19070428914", "01110540457", "27061246180", "27056341256", "13105013773", "27036345107", "31082817118", "06115110088", "15105730222", "20052542872", "16096010048", "25122123025", "10094641611", "11034548759", "16103839568", "17100930382", "11094129240", "02022029110", "17106242046", "12106207591", "23074421733", "06123642862", "23126244819", "13124902694", "08081101885", "22015211354", "21013130903", "02122305093", "23010019192", "29044201982", "24100324632", "24013846509", "21024927722", "25106340725", "16083327239", "31034007376", "15121411005", "20015216191", "25113637032", "26075821742", "18060828616", "29051214674", "19126131146", "26043134476", "20124131643", "29075545310", "29094040734", "01055524900", "29076437376", "27040714753", "10096633292", "04099754678", "06081102277", "08069899936", "08021834301", "18059884715", "18045613433", "25096416248", "25120211954", "26040910149", "05086131120", "22033447179", "12045314845", "02122312332", "25096647819", "21030620507", "26101618802", "14073911886", "04115003416", "25111041191", "11069684981", "01033241638", "07114207610", "14090225597", "10011130785", "21084015145", "18065138693", "21070305647", "25100337862", "30060807694", "08091021456", "19052803538", "16126241708", "19029750915", "19052047725", "15065819209", "02013245013", "28082011120", "27086345590", "12080322230", "29115414354", "30091342681", "23104817351", "18050542919", "22063729772", "10075347206", "16084800833", "09024430097", "01024032112", "29041435516", "08115302893", "05074909924", "19099758808", "03062045476", "10094712861", "11053907778", "20062606097", "19102611627", "27106512758", "22059952793", "19060604080", "11111513424", "24030202607", "14072424973", "11110422220", "12010841346", "13126129011", "10123039667", "31053648854", "29101736693", "30093149412", "09060608617", "07111913875", "18030536645", "19123804832", "15022305376", "13031915419", "15106031603", "15012828958", "26040746632", "31125107454", "28021640524", "31034442404", "09101119162", "08072518595", "15122923778", "02052538788", "21104313105", "21095508070", "02114908889", "16102948053", "02013914853", "13041911578", "23101716481", "09076347295", "03084733708", "14029668915", "17014122842", "08121512794", "22010539092", "11013406253", "09115212289", "04059650756", "24094335554", "17084615870", "25055616100", "11023346283", "14036438143", "24096131476", "22033837937", "23124303443", "22094532470", "23075543980", "23030123395", "18109671580", "10081235622", "20012049200", "30011228476", "30093913872", "29091211910", "01061730466", "12095347930", "10010933094", "22091122883", "03056626505", "18072343111", "14084414019", "17062318252", "21042831856", "03062007698", "16021847171", "25031247198", "03055615054", "16061512628", "31059997591", "10090645116", "15075346317", "29115839673", "10031546643", "21053445451", "05125424823", "23044029804", "10066417358", "26041503873", "30015003363", "15090710157", "12011248851", "14041024063", "04081813839", "31036116946", "07114921801", "05074332090", "02073642070", "02123322404", "19102233509", "10039651837", "24122702606", "31082308469", "11113122333", "04109679920", "22020342378", "20114343235", "19083010404", "09020424386", "20084610225", "08014748289", "14125332715", "10066343737", "05026324388", "28079678793", "11086630941", "01121319434", "17092608131", "14112442643", "23112748318", "15064031225", "04045736933", "05031643602", "30084722614", "11012503603", "19124843947", "20070510635", "08024502334", "29112218511", "01080036686", "08066217095", "03103928582", "14054946709", "01040135258", "19080024161", "14034440035", "01056204950", "19021710949", "01014138419", "01085116874", "18034724292", "04079883218", "16084343351", "06112416593", "13102701318", "04100422277", "21075330003", "08026249539", "01060044496", "11103922633", "31030741075", "05062220564", "16085700174", "13044233996", "03064148671", "04104513102", "07055033352", "17112946667", "20113429144", "09106040696", "09113322559", "07079879538", "01064723444", "13044342086", "15101644283", "29035205509", "29083306236", "06105524984", "27080734072", "27011202581", "05119689084", "25055430252", "11113026334", "24043924482", "14020945185", "15122248159", "10065644555", "06109770173", "26031828677", "28113924669", "28021433677", "28112044436", "14064322827", "28090226136", "24123309487", "10122611766", "07036327736", "13033525707", "24114832339", "21074331898", "13120716705", "27112512654", "23083844418", "21094311257", "10036115233", "04129951651" })
        Console.WriteLine(pn + " " + NorwegianPersonalNumberValidator.Validate(pn));

    // Some of these fail because individual-number falls within range specifications modified since 2013
    foreach (var pn in new[] { "10083707696", "13093347166", "25082347197", "26109815046", "22022912694", "18031445155", "16030389615", "07092846657", "31059624876", "04077129877", "26112803822", "08121510198", "23042348880", "27063413890", "09030766986", "06108721853", "14127632058", "12086022409", "28084133568", "24049651844", "28065002622", "19024308416", "07025722390", "29020842316", "06087743258", "20100924359", "29119751495", "25059992409", "07056334208", "09128248274", "01109432780", "02121093742", "05115905424", "28120468229", "29051098151", "10072619469", "29044808119", "07023610501", "11034542645", "05055048314", "02107131240", "20050086985", "16053043643", "03121733217", "12018422660", "17064503634", "27090297444", "03048643964", "05041210674", "05097902315", "07114118537", "17030967038", "22077028521", "08128646702", "17076614105", "06120435254", "19110324122", "17027840000", "10010954903", "04013210964", "05097238490", "16099016802", "06048324272", "05040033272", "24051623408", "23027743323", "25024516515", "25025001357", "30111022298", "25064808071", "26019430072", "24080899544", "07070344453", "13111347470", "18077042063", "05087022635", "24021541008", "08014120557", "21050083443", "03010150123", "12117433941", "31075014360", "18026418417", "14129766973", "24057348689", "09088833322", "22095346603", "04046229113", "06097808951", "17050690660", "03076022568", "21127402415", "12088323473", "25077642032", "02063144269", "02119105563", "02036006202", "01119724933", "06111534096", "18052302559", "13028929743", "05079530214", "20053746420", "26055526353", "09051845177", "04124148184", "28129844541", "30129870172", "15113328697", "25107024606", "09122633672", "05095300180", "08117622828", "23060726175", "17096009437", "19094811778", "07125437154", "23061077731", "14106225746", "20028632305", "10017731896", "08051616759", "30078506187", "15124612672", "30086844466", "01020765271", "06090201628", "30060409702", "15029030755", "19109331425", "09115512231", "07099808351", "11011458817", "26073736543", "28086016372", "14082849697", "18056009597", "28092209042", "31019831259", "01078941584", "26045905194", "01037408367", "22103232094", "15010940661", "25068944891", "21061606855", "30048711215", "10020879985", "28065614792", "18074300746", "18126104185", "27085129002", "15098749907", "19097622577", "30100422081", "02032406192", "16030761387", "10121061746", "26046935372", "06044544812", "07052131469", "19092748777", "30058415517", "22124447589", "03080235630", "18017605891", "18065504304", "24108217045", "06100542887", "10049103900", "20057238306", "20090032314", "22055913432", "16038836483", "20092608078", "14048424105", "12107944298", "04113432638", "09011416605", "29071641145", "06125519383", "02033905079", "13028938599", "02101285076", "05116220212", "08122038867", "25034718558", "05020678226", "13014030241", "17095234623", "20010965579", "19093536447", "27010983466", "19110648394", "11123927267", "22024324951", "03067614983", "21046341837", "04117204702", "01093732827", "28041172276", "25032128125", "24095542197", "13025443424", "28017207638", "18080161642", "23030671635", "08047331561", "01111428634", "30109998849", "01084922087", "26034431158", "11098942590", "17031822874", "07082123649", "16090761750", "08051363400", "20117126642", "17021703117", "11063234178", "09098723339", "15022341739", "06120822541", "24112342946", "27129520855", "19117808524", "06082525856", "11111346013", "08042703002", "04027611996", "17121254816", "27112533988", "16120606577", "17070633388", "05124029475", "23120874934", "08072129297", "07110840777", "08053328998", "16080955913", "28044226865", "29038936725", "19113649243", "06081838729", "22035212713", "11058304818", "07023640095", "08090987667", "20110123184", "18079407514", "16081931228", "15036018264", "28127416615", "22112437731", "20064120132", "28030568100", "03129134282", "31076710131", "08124247005", "10105937852", "25120006331", "23085711822", "14019638856", "25080605040", "21045441234", "25030831694", "22102645220", "21034242078", "28088406925", "03062302916", "05121706425", "14120267133", "26123546724", "06113319486", "07057332578", "22121348458", "21063847345", "30092814455", "31080685591", "22089511511", "22082246456", "23108110864", "24110674194", "23111463719", "31084643028", "07095645997", "13022543460", "29121626428", "01056941033", "07063711467", "20010016895", "25113640955", "11083912148", "07066618832", "06082743640", "14069776281", "09120022854", "31032647467", "04031837907", "24115907529", "02067448599", "23053924190", "19010792439", "09071169925", "26019205796", "07024548702", "15031053983", "13126733814", "24012027482", "01090168424", "01066847973", "05031938165", "02028403286", "15126503943", "15010472919", "23072128702", "28040770676", "21024930545", "13039639771", "23013331464", "19010360970", "07100739873", "02016040846", "04107244854", "30010112199", "12073523212", "27031397443", "29092725837", "12043915779", "17051630602", "17036036923", "20017312228", "10018507302", "01011149614", "03116638648", "30011588596", "05036133696", "20043143469", "16103517579", "22078812501", "30090943290", "16076024557", "13032314214", "01127722451", "13067742286", "13103543295", "09013932902", "25128524013", "06060193299", "24011289807", "20067305524", "15122835054", "24029669356", "23084822086", "14078315823", "06112612422", "09041080970", "29119612398", "14025200404", "10072522856", "08089116164", "25021053611", "08100996279", "01021566809", "30063706783", "10010720023", "29109604184", "03080912322", "30095226589", "16129639737", "18100691481", "14023908175", "17029866368", "03050795127", "19021230394", "10030642371", "18079435844", "25043631112", "06051498257", "20010811784", "12055743760", "01066249707", "06058943590", "01046330877", "21100345363", "20070807875", "04091134026", "17090665367", "24115231568", "14103114560", "08118020597", "28077431847", "21063719770", "14016015793", "23022546740", "30034806329", "14098543903", "17060131201", "20018235812", "08041304813", "17070290324", "17069049745", "01067816605", "06035435660", "17054933878", "22015237574", "26026620642", "22124143857", "13039703429", "22068723942", "02109438661", "20103007144", "07087331320", "17082321217", "02067144352", "29106604442", "26069772985", "05032814044", "30099030913", "22090036061", "15022327140", "23083929723", "05033424223", "14040991329", "13112921103", "06107343030", "25020297789", "16125021208", "15126600140", "03034247667", "17110482302", "24082812268", "16124516874", "13036349292", "04049980979", "23115107623", "17107147616", "06049629069", "25107322577", "21064541983", "07108343340", "07080668958", "29071543992", "18110254675", "17105516770", "25050881507", "13107600978", "06112223981", "25030192780", "21071644542", "10066326344", "10108731791", "21065328922", "05086413088", "20128028227", "11085021658", "24054403859", "15017008169", "25020744874", "19020233403", "11090881630", "25037546316", "07079135377", "22021218662", "22010683347", "25086327093", "27099647286", "25010443876", "28040663306", "13012532533", "17097020663", "27117522143", "08103642265", "24056001588", "03068818612", "12066541817", "06049824457", "12021915813", "24030895300", "29108145682", "07016737369", "30086437577", "29017338127", "03011362329", "27100131795", "20111010758", "08079335771", "11076010082", "18028944272", "12017224601", "03094619784", "17086849011", "05088745258", "19022403403", "29039536941", "11024645470", "27061366984", "14064536177" })
        Console.WriteLine(pn + " " + NorwegianPersonalNumberValidator.Validate(pn));
}

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

public static class NorwegianPersonalNumberValidator

{

// Implementation of Norwegian personal number verification based on specifications outlined on https://no.wikipedia.org/wiki/F%C3%B8dselsnummer

// Version 1: 2016-12-07 Tedd Hansen, tedd@konge.net

public class Result

{

public enum GenderType

{

Male,

Female

}

[Flags]

public enum NumberType

{

Normal = 0,

D = 1,

H = 2,

DAndF = 3, // Not valid

FH = 4,

DAndFG = 5, // Not valid

HAndFH = 6, // Not valid

DAndHAndFH = 7 // Not valid

}

public bool Success { get; set; }

public string ErrorMessage { get; set; }

public GenderType Gender { get; set; }

public NumberType Type { get; set; }

public DateTime Birthday { get; set; }

public override string ToString()

{

if (Success)

return $"Success: {Success}, Birthday: {Birthday.ToString("yyyy'-'MM'-'dd")}, Gender: {Gender}, Type: {Type}";

else

return $"Success: {Success}, ErrorMessage: {ErrorMessage ?? "N/A"}";

}

private struct IndividualNumberControlRange

{

public int From;

public int To;

public int FromYear;

public int ToYear;

}

private static readonly IndividualNumberControlRange[] IndividualControlRange = new[] {

new IndividualNumberControlRange() { From = 0, To = 499, FromYear = 1900, ToYear = 1999 },

new IndividualNumberControlRange() { From = 500, To = 749, FromYear = 1854, ToYear = 1899 },

new IndividualNumberControlRange() { From = 500, To = 999, FromYear = 2000, ToYear = 2039 },

new IndividualNumberControlRange() { From = 900, To = 999, FromYear = 1940, ToYear = 1999 },

};

private static Regex PersonalNumberRegex = new Regex(@"^(?<birthdate>(?<day>\d\d)(?<month>\d\d)(?<year>\d\d))(?<individual>\d\d(?<gender>\d))(?<checksum>\d\d)$");

public static Result Validate(string number)

{

var result = new Result();

// Is it the correct length?

if (number == null || number.Length != 11)

return new Result() { Success = false, ErrorMessage = "Feil lengde. Personnummer er 11 tall." };

// Extract what we need

var match = PersonalNumberRegex.Match(number);

// Regex is only looking for 11 numbers, so we can assume any error is because there are non-numbers

if (!match.Success)

return new Result() { Success = false, ErrorMessage = "Personummer skal kun inneholde tall." };

// Parse the numbers

var day = int.Parse(match.Groups["day"].Value);

var month = int.Parse(match.Groups["month"].Value);

var year = int.Parse(match.Groups["year"].Value);

var individual = int.Parse(match.Groups["individual"].Value);

var gender = int.Parse(match.Groups["gender"].Value);

var checksum = int.Parse(match.Groups["checksum"].Value);

// Compensate for D-numbers

if (day > 31)

{

result.Type |= Result.NumberType.D;

day -= 40;

}

// Compensate for H-numbers

if (month > 30)

{

result.Type |= Result.NumberType.H;

month -= 40;

}

// Compensate for FH-numbers

if (day >= 80)

{

result.Type |= Result.NumberType.FH;

day = 1;

}

// Determine gender (not that we need it)

result.Gender = gender % 2 != 0 ? Result.GenderType.Male : Result.GenderType.Female;

int fullYear = 0;

// Get the range based on the individual range

var ranges = IndividualControlRange.Where(r => individual >= r.From && individual <= r.To).ToList();

if (ranges == null || ranges.Count == 0)

return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#3)" };

foreach (var range in ranges)

{

// Get full year based on the range

// Note that if there is a change to range so it crosses centuries then we need more checking here - or else the next check will fail

var fYear = int.Parse(range.FromYear.ToString().Substring(0, 2) + year.ToString("D2"));

// Check that we are within allowed range

if (fYear >= range.FromYear && fYear <= range.ToYear)

{

fullYear = fYear;

break;

}

if (fullYear == 0)

return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#4)" };

// Have .Net verify the date, using ISO 8601 should be universally safe

var iso8601Birthday = fullYear + "-" + month.ToString("D2") + "-" + day.ToString("D2");

DateTime dtBirthday;

if (!DateTime.TryParse(iso8601Birthday, out dtBirthday))

return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#5)" };

result.Birthday = dtBirthday;

// And finally calculate and verify the two checksum digits at the end of the number

// Convert personal number string to int array

var n = number.Select(c => int.Parse(c.ToString())).ToArray();

// Calculate checksum number 1

int k1 = 11 - (3 * n[0] + 7 * n[1] + 6 * n[2] + 1 * n[3] + 8 * n[4] + 9 * n[5] + 4 * n[6] + 5 * n[7] + 2 * n[8]) % 11;

if (k1 == 11) k1 = 0;

if (k1 == 10 || k1 != n[9])

return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#6)" };

// Calculate checksum number 2

int k2 = 11 - (5 * n[0] + 4 * n[1] + 3 * n[2] + 2 * n[3] + 7 * n[4] + 6 * n[5] + 5 * n[6] + 4 * n[7] + 3 * n[8] + 2 * k1) % 11;

if (k2 == 11) k2 = 0;

if (k2 == 10 || k2 != n[10])

return new Result() { Success = false, ErrorMessage = "Feil i personnummer. (#7)" };

result.Success = true;

return result;

}

void Main()

{

// Test a whole lot of numbers...

foreach (var pn in new[] { "11056027043", "01073703642", "11123434945", "19073120317", "02012526582", "01052304454", "28023727473", "07052739084", "03126320255", "13106215582", "07032425814", "26082416446", "15060238585", "30121408178", "27096212181", "23021347574", "20064234219", "15081024143", "26045230189", "10082000734", "02012048281", "20046647611", "29096114654", "10026402781", "06122615721", "17093725573", "04121422528", "04024403756", "20101229085", "19092040383", "23053739865", "24101534665", "12021509637", "29011203424", "18100810960", "22040112832", "18101938626", "16021315420", "18060835965", "26050311189", "27094110284", "21112531448", "28015703069", "21122141931", "30062121293", "10095324709", "03129788495", "19123924293", "24020317082", "26085821228", "26093737317", "29123535985", "29034704358", "05079764185", "11022315392", "01070615963", "19123122669", "21072401511", "22054406766", "09104338078", "18062248188", "30030827720", "30112309574", "13052429840", "18071235706", "21031838069", "27124620754", "06024248559", "03033029178", "23123301676", "02034006841", "21072007651", "02125218752", "09036030736", "17021721999", "08023716837", "30031710606", "08116344379", "27116322930", "15071437741", "17093343433", "13030820546", "13044940323", "07052826904", "04072204420", "19116213748", "23109866350", "05012118130", "21094016352", "25095110668", "11123630884", "01114934301", "10022530181", "19056102216", "06025612378", "24074641810", "01040326363", "03034908183", "13032149086", "02114412077", "18080406424", "17072630378", "04092334681", "29080604899", "25123841185", "10113841724", "12065136587", "06030310878", "22020526134", "13102022887", "11115532164", "02072342685", "28114002692", "29104548448", "28052326658", "18116435868", "27044618252", "22024417623", "23022628828", "26034940583", "06051220313", "11042224601", "07083106608", "09039858808", "20022534093", "13035932571", "07081439073", "08053604146", "07073128735", "26096220609", "31075807301", "03022413723", "07063723511", "26066222992", "06084708613", "23013117187", "29073019808", "24062118284", "16032844042", "15123629776", "14123902867", "16035907215", "07095638052", "11034806901", "22126334676", "05031049115", "30092903458", "20034734152", "11063819206", "25055243754", "27035620058", "21051146074", "20094511330", "05059959494", "16053718144", "04124348973", "19112526393", "15065744985", "04106439600", "10121512268", "11020023335", "08081519855", "05075030136", "07056207850", "11115902573", "02042847839", "16100324044", "06075042491", "21079891638", "18070849859", "01015033106", "19072248530", "12023702809", "27080408124", "18044930346", "22100127346", "16119888232", "27033837831", "04042622287", "14034120723", "15014131539", "20035421794", "18115548537", "23064702998", "02024939521", "24030549194", "28094723177", "12030246126", "28063144225", "08052621187", "01110836399", "19011233360", "20101138829", "11053336886", "12114423309", "10070343334", "14093948247", "07043538963", "28014503937", "19070428914", "01110540457", "27061246180", "27056341256", "13105013773", "27036345107", "31082817118", "06115110088", "15105730222", "20052542872", "16096010048", "25122123025", "10094641611", "11034548759", "16103839568", "17100930382", "11094129240", "02022029110", "17106242046", "12106207591", "23074421733", "06123642862", "23126244819", "13124902694", "08081101885", "22015211354", "21013130903", "02122305093", "23010019192", "29044201982", "24100324632", "24013846509", "21024927722", "25106340725", "16083327239", "31034007376", "15121411005", "20015216191", "25113637032", "26075821742", "18060828616", "29051214674", "19126131146", "26043134476", "20124131643", "29075545310", "29094040734", "01055524900", "29076437376", "27040714753", "10096633292", "04099754678", "06081102277", "08069899936", "08021834301", "18059884715", "18045613433", "25096416248", "25120211954", "26040910149", "05086131120", "22033447179", "12045314845", "02122312332", "25096647819", "21030620507", "26101618802", "14073911886", "04115003416", "25111041191", "11069684981", "01033241638", "07114207610", "14090225597", "10011130785", "21084015145", "18065138693", "21070305647", "25100337862", "30060807694", "08091021456", "19052803538", "16126241708", "19029750915", "19052047725", "15065819209", "02013245013", "28082011120", "27086345590", "12080322230", "29115414354", "30091342681", "23104817351", "18050542919", "22063729772", "10075347206", "16084800833", "09024430097", "01024032112", "29041435516", "08115302893", "05074909924", "19099758808", "03062045476", "10094712861", "11053907778", "20062606097", "19102611627", "27106512758", "22059952793", "19060604080", "11111513424", "24030202607", "14072424973", "11110422220", "12010841346", "13126129011", "10123039667", "31053648854", "29101736693", "30093149412", "09060608617", "07111913875", "18030536645", "19123804832", "15022305376", "13031915419", "15106031603", "15012828958", "26040746632", "31125107454", "28021640524", "31034442404", "09101119162", "08072518595", "15122923778", "02052538788", "21104313105", "21095508070", "02114908889", "16102948053", "02013914853", "13041911578", "23101716481", "09076347295", "03084733708", "14029668915", "17014122842", "08121512794", "22010539092", "11013406253", "09115212289", "04059650756", "24094335554", "17084615870", "25055616100", "11023346283", "14036438143", "24096131476", "22033837937", "23124303443", "22094532470", "23075543980", "23030123395", "18109671580", "10081235622", "20012049200", "30011228476", "30093913872", "29091211910", "01061730466", "12095347930", "10010933094", "22091122883", "03056626505", "18072343111", "14084414019", "17062318252", "21042831856", "03062007698", "16021847171", "25031247198", "03055615054", "16061512628", "31059997591", "10090645116", "15075346317", "29115839673", "10031546643", "21053445451", "05125424823", "23044029804", "10066417358", "26041503873", "30015003363", "15090710157", "12011248851", "14041024063", "04081813839", "31036116946", "07114921801", "05074332090", "02073642070", "02123322404", "19102233509", "10039651837", "24122702606", "31082308469", "11113122333", "04109679920", "22020342378", "20114343235", "19083010404", "09020424386", "20084610225", "08014748289", "14125332715", "10066343737", "05026324388", "28079678793", "11086630941", "01121319434", "17092608131", "14112442643", "23112748318", "15064031225", "04045736933", "05031643602", "30084722614", "11012503603", "19124843947", "20070510635", "08024502334", "29112218511", "01080036686", "08066217095", "03103928582", "14054946709", "01040135258", "19080024161", "14034440035", "01056204950", "19021710949", "01014138419", "01085116874", "18034724292", "04079883218", "16084343351", "06112416593", "13102701318", "04100422277", "21075330003", "08026249539", "01060044496", "11103922633", "31030741075", "05062220564", "16085700174", "13044233996", "03064148671", "04104513102", "07055033352", "17112946667", "20113429144", "09106040696", "09113322559", "07079879538", "01064723444", "13044342086", "15101644283", "29035205509", "29083306236", "06105524984", "27080734072", "27011202581", "05119689084", "25055430252", "11113026334", "24043924482", "14020945185", "15122248159", "10065644555", "06109770173", "26031828677", "28113924669", "28021433677", "28112044436", "14064322827", "28090226136", "24123309487", "10122611766", "07036327736", "13033525707", "24114832339", "21074331898", "13120716705", "27112512654", "23083844418", "21094311257", "10036115233", "04129951651" })

Console.WriteLine(pn + " " + NorwegianPersonalNumberValidator.Validate(pn));

// Some of these fail because individual-number falls within range specifications modified since 2013

foreach (var pn in new[] { "10083707696", "13093347166", "25082347197", "26109815046", "22022912694", "18031445155", "16030389615", "07092846657", "31059624876", "04077129877", "26112803822", "08121510198", "23042348880", "27063413890", "09030766986", "06108721853", "14127632058", "12086022409", "28084133568", "24049651844", "28065002622", "19024308416", "07025722390", "29020842316", "06087743258", "20100924359", "29119751495", "25059992409", "07056334208", "09128248274", "01109432780", "02121093742", "05115905424", "28120468229", "29051098151", "10072619469", "29044808119", "07023610501", "11034542645", "05055048314", "02107131240", "20050086985", "16053043643", "03121733217", "12018422660", "17064503634", "27090297444", "03048643964", "05041210674", "05097902315", "07114118537", "17030967038", "22077028521", "08128646702", "17076614105", "06120435254", "19110324122", "17027840000", "10010954903", "04013210964", "05097238490", "16099016802", "06048324272", "05040033272", "24051623408", "23027743323", "25024516515", "25025001357", "30111022298", "25064808071", "26019430072", "24080899544", "07070344453", "13111347470", "18077042063", "05087022635", "24021541008", "08014120557", "21050083443", "03010150123", "12117433941", "31075014360", "18026418417", "14129766973", "24057348689", "09088833322", "22095346603", "04046229113", "06097808951", "17050690660", "03076022568", "21127402415", "12088323473", "25077642032", "02063144269", "02119105563", "02036006202", "01119724933", "06111534096", "18052302559", "13028929743", "05079530214", "20053746420", "26055526353", "09051845177", "04124148184", "28129844541", "30129870172", "15113328697", "25107024606", "09122633672", "05095300180", "08117622828", "23060726175", "17096009437", "19094811778", "07125437154", "23061077731", "14106225746", "20028632305", "10017731896", "08051616759", "30078506187", "15124612672", "30086844466", "01020765271", "06090201628", "30060409702", "15029030755", "19109331425", "09115512231", "07099808351", "11011458817", "26073736543", "28086016372", "14082849697", "18056009597", "28092209042", "31019831259", "01078941584", "26045905194", "01037408367", "22103232094", "15010940661", "25068944891", "21061606855", "30048711215", "10020879985", "28065614792", "18074300746", "18126104185", "27085129002", "15098749907", "19097622577", "30100422081", "02032406192", "16030761387", "10121061746", "26046935372", "06044544812", "07052131469", "19092748777", "30058415517", "22124447589", "03080235630", "18017605891", "18065504304", "24108217045", "06100542887", "10049103900", "20057238306", "20090032314", "22055913432", "16038836483", "20092608078", "14048424105", "12107944298", "04113432638", "09011416605", "29071641145", "06125519383", "02033905079", "13028938599", "02101285076", "05116220212", "08122038867", "25034718558", "05020678226", "13014030241", "17095234623", "20010965579", "19093536447", "27010983466", "19110648394", "11123927267", "22024324951", "03067614983", "21046341837", "04117204702", "01093732827", "28041172276", "25032128125", "24095542197", "13025443424", "28017207638", "18080161642", "23030671635", "08047331561", "01111428634", "30109998849", "01084922087", "26034431158", "11098942590", "17031822874", "07082123649", "16090761750", "08051363400", "20117126642", "17021703117", "11063234178", "09098723339", "15022341739", "06120822541", "24112342946", "27129520855", "19117808524", "06082525856", "11111346013", "08042703002", "04027611996", "17121254816", "27112533988", "16120606577", "17070633388", "05124029475", "23120874934", "08072129297", "07110840777", "08053328998", "16080955913", "28044226865", "29038936725", "19113649243", "06081838729", "22035212713", "11058304818", "07023640095", "08090987667", "20110123184", "18079407514", "16081931228", "15036018264", "28127416615", "22112437731", "20064120132", "28030568100", "03129134282", "31076710131", "08124247005", "10105937852", "25120006331", "23085711822", "14019638856", "25080605040", "21045441234", "25030831694", "22102645220", "21034242078", "28088406925", "03062302916", "05121706425", "14120267133", "26123546724", "06113319486", "07057332578", "22121348458", "21063847345", "30092814455", "31080685591", "22089511511", "22082246456", "23108110864", "24110674194", "23111463719", "31084643028", "07095645997", "13022543460", "29121626428", "01056941033", "07063711467", "20010016895", "25113640955", "11083912148", "07066618832", "06082743640", "14069776281", "09120022854", "31032647467", "04031837907", "24115907529", "02067448599", "23053924190", "19010792439", "09071169925", "26019205796", "07024548702", "15031053983", "13126733814", "24012027482", "01090168424", "01066847973", "05031938165", "02028403286", "15126503943", "15010472919", "23072128702", "28040770676", "21024930545", "13039639771", "23013331464", "19010360970", "07100739873", "02016040846", "04107244854", "30010112199", "12073523212", "27031397443", "29092725837", "12043915779", "17051630602", "17036036923", "20017312228", "10018507302", "01011149614", "03116638648", "30011588596", "05036133696", "20043143469", "16103517579", "22078812501", "30090943290", "16076024557", "13032314214", "01127722451", "13067742286", "13103543295", "09013932902", "25128524013", "06060193299", "24011289807", "20067305524", "15122835054", "24029669356", "23084822086", "14078315823", "06112612422", "09041080970", "29119612398", "14025200404", "10072522856", "08089116164", "25021053611", "08100996279", "01021566809", "30063706783", "10010720023", "29109604184", "03080912322", "30095226589", "16129639737", "18100691481", "14023908175", "17029866368", "03050795127", "19021230394", "10030642371", "18079435844", "25043631112", "06051498257", "20010811784", "12055743760", "01066249707", "06058943590", "01046330877", "21100345363", "20070807875", "04091134026", "17090665367", "24115231568", "14103114560", "08118020597", "28077431847", "21063719770", "14016015793", "23022546740", "30034806329", "14098543903", "17060131201", "20018235812", "08041304813", "17070290324", "17069049745", "01067816605", "06035435660", "17054933878", "22015237574", "26026620642", "22124143857", "13039703429", "22068723942", "02109438661", "20103007144", "07087331320", "17082321217", "02067144352", "29106604442", "26069772985", "05032814044", "30099030913", "22090036061", "15022327140", "23083929723", "05033424223", "14040991329", "13112921103", "06107343030", "25020297789", "16125021208", "15126600140", "03034247667", "17110482302", "24082812268", "16124516874", "13036349292", "04049980979", "23115107623", "17107147616", "06049629069", "25107322577", "21064541983", "07108343340", "07080668958", "29071543992", "18110254675", "17105516770", "25050881507", "13107600978", "06112223981", "25030192780", "21071644542", "10066326344", "10108731791", "21065328922", "05086413088", "20128028227", "11085021658", "24054403859", "15017008169", "25020744874", "19020233403", "11090881630", "25037546316", "07079135377", "22021218662", "22010683347", "25086327093", "27099647286", "25010443876", "28040663306", "13012532533", "17097020663", "27117522143", "08103642265", "24056001588", "03068818612", "12066541817", "06049824457", "12021915813", "24030895300", "29108145682", "07016737369", "30086437577", "29017338127", "03011362329", "27100131795", "20111010758", "08079335771", "11076010082", "18028944272", "12017224601", "03094619784", "17086849011", "05088745258", "19022403403", "29039536941", "11024645470", "27061366984", "14064536177" })

Console.WriteLine(pn + " " + NorwegianPersonalNumberValidator.Validate(pn));

}

(PS: This code is easy to test in LINQPad. Select C# Program, paste it in and hit run.)

Category Archives: C#

Norwegian personal number verification in C#

C# Regex for verifying e-mails

ASP.Net 5 Identity Framework 3.0 manually adding users

ASP.Net 5 Areas

Comparison of Environment.TickCount, DateTime.Now.Ticks and Stopwatch.ElapsedMilliseconds

Better text console for C#

Multiple deployment configs in one config file with ACL

Converting hex string into Color (Windows Phone)

Async callback to awaitable Task<>

Battlefield Heroes Rcon .Net library