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jwt token vb.net validation

By MFMF on Nov 30, 2020
class Program {

    static string key = "401b09eab3c013d4ca54922bb802bec8fd5318192b0a75f201d8b3727429090fb337591abd3e44453b954555b7a0812e1081c39b740293f765eae731f5a65ed1";

    static void Main(string[] args) {
        var stringToken = GenerateToken();

    private static string GenerateToken() {
        var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));

        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

        var header = new JwtHeader(credentials);

        var payload = new JwtPayload {
           { "some ", "hello "},
           { "scope", "world"},

        var secToken = new JwtSecurityToken(header, payload);
        var handler = new JwtSecurityTokenHandler();

        return handler.WriteToken(secToken);


    private static bool ValidateToken(string authToken) {
        var tokenHandler = new JwtSecurityTokenHandler();
        var validationParameters = GetValidationParameters();

        SecurityToken validatedToken;
        IPrincipal principal = tokenHandler.ValidateToken(authToken, validationParameters, out validatedToken);
        Thread.CurrentPrincipal = principal;
        return true;

    private static TokenValidationParameters GetValidationParameters() {
        return new TokenValidationParameters() {

Source: stackoverflow.com

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By MFMF on Nov 21, 2020
Dim privateKeyStream As Stream = New FileStream("D:\docusign.pem", FileMode.Open)
'Dim privateKeyStream As Stream = New MemoryStream(Encoding.UTF8.GetBytes(PK))
Using SR = New StreamReader(privateKeyStream)
    If Not SR Is Nothing And SR.Peek() > 0 Then
        Dim privateKeyBytes() As Byte = ReadAsBytes(privateKeyStream)
        'Dim privateKeyBytes() As Byte = StreamToByteArray(privateKeyStream)
        'Dim privateKeyBytes() As Byte = Convert.FromBase64String(PrivateKey)
        'Dim privateKeyBytes() As Byte = Encoding.UTF8.GetBytes(PrivateKey)

        Dim privateKeyS As String = Encoding.UTF8.GetString(privateKeyBytes)

        Dim handler As JwtSecurityTokenHandler = New JwtSecurityTokenHandler()
        handler.SetDefaultTimesOnTokenCreation = False

        Dim descriptor As SecurityTokenDescriptor = New SecurityTokenDescriptor()
        descriptor.Expires = DateTime.UtcNow.AddHours(1)
        descriptor.IssuedAt = DateTime.UtcNow

        Dim scopes As List(Of String) = New List(Of String)

        descriptor.Subject = New ClaimsIdentity()
        descriptor.Subject.AddClaim(New Claim("scope", String.Join(" ", scopes)))
        descriptor.Subject.AddClaim(New Claim("aud", "account-d.docusign.com"))
        descriptor.Subject.AddClaim(New Claim("iss", "INTEGRATION_ID"))
        descriptor.Subject.AddClaim(New Claim("sub", "ACCOUNT_ID"))

        Dim RSA = CreateRSAKeyFromPem(privateKeyS)
        Dim rsaKey As RsaSecurityKey = New RsaSecurityKey(RSA)
        descriptor.SigningCredentials = New SigningCredentials(rsaKey, SecurityAlgorithms.RsaSha256Signature)

        Dim Token = handler.CreateToken(descriptor)
        Dim jwtToken As String = handler.WriteToken(Token)

        Dim baseUri As String = String.Format("https://{0}/", basePath)
        Dim RestClient As RestClient = New RestClient(baseUri)
        RestClient.Timeout = 10000

        Dim contentType As String = "application/x-www-form-urlencoded"

        Dim formParams As New Dictionary(Of String, String)
        formParams.Add("grant_type", OAuth.Grant_Type_JWT)
        formParams.Add("assertion", jwtToken)

        Dim queryParams As New Dictionary(Of String, String)

        Dim headerParams As New Dictionary(Of String, String)
        headerParams.Add("Content-Type", "application/x-www-form-urlencoded")
        headerParams.Add("Cache-Control", "no-store")
        headerParams.Add("Pragma", "no-cache")

        Dim fileParams As New Dictionary(Of String, FileParameter)
        Dim pathParams As New Dictionary(Of String, String)

        Dim postBody As Object = Nothing

        Dim request As RestRequest = PrepareRequest(basePath, Method.POST, queryParams, postBody, headerParams, formParams, fileParams, pathParams, contentType)

        Dim response As IRestResponse = RestClient.Execute(request)

        If (response.StatusCode >= HttpStatusCode.OK And response.StatusCode < HttpStatusCode.BadRequest) Then
            Dim tokenInfo As OAuth.OAuthToken = JsonConvert.DeserializeObject(Of OAuth.OAuthToken)(response.Content)
            Return tokenInfo.access_token
            Throw New ApiException(response.StatusCode, "Error while requesting server, received a non successful HTTP code " & response.ResponseStatus & " with response Body: " + response.Content, response.Content)
        End If
        Throw New ApiException(400, "Private key stream not supplied or is invalid!")
    End If
End Using

Source: stackoverflow.com

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By MFMF on Nov 21, 2020
Dim PrivateKey As String = "MIIEowIBAAKCAQEAjtTe7UUP/CBI9s...BLABLABLA...JfwZ2hHqFPXA9ecbhc0".Replace(vbLf, "").Replace(vbCr, "")

Dim ar1 As JObject = New JObject()
ar1.Add("typ", "JWT")
ar1.Add("alg", "RS256")

Dim header As String = Base64UrlEncoder.Encode(ar1.ToString)

Dim ar2 As JObject = New JObject()
ar2.Add("iss", "INTEGRATION_ID")
ar2.Add("sub", "GUID_VERSION_OF_USER_ID")
ar2.Add("iat", DateDiff(DateInterval.Second, New Date(1970, 1, 1), Now().ToUniversalTime))
ar2.Add("exp", DateDiff(DateInterval.Second, New Date(1970, 1, 1), DateAdd(DateInterval.Hour, 1, Now().ToUniversalTime)))
ar2.Add("aud", "account-d.docusign.com")
ar2.Add("scope", "signature")

Dim body As String = Base64UrlEncoder.Encode(ar2.ToString)

Dim stringToSign As String = header & "." & body

Dim bytesToSign() As Byte = Encoding.UTF8.GetBytes(stringToSign)

Dim keyBytes() As Byte = Convert.FromBase64String(PrivateKey)

Dim privKeyObj = Asn1Object.FromByteArray(keyBytes)
Dim privStruct = RsaPrivateKeyStructure.GetInstance(privKeyObj)

Dim sig As ISigner = SignerUtilities.GetSigner("SHA256withRSA")

sig.Init(True, New RsaKeyParameters(True, privStruct.Modulus, privStruct.PrivateExponent))

sig.BlockUpdate(bytesToSign, 0, bytesToSign.Length)
Dim signature() As Byte = sig.GenerateSignature()

Dim sign As String = Base64UrlEncoder.Encode(signature)

Return header & "." & body & "." & sign

Source: stackoverflow.com

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By MFMF on Nov 21, 2020
Dim ac As ApiClient = New ApiClient()
Dim privateKeyStream() As Byte = Convert.FromBase64String(PrivateKey)
Dim tokenInfo As OAuth.OAuthToken = ac.RequestJWTUserToken("INTEGRATION_ID", "ACCOUNT_ID", "https://account-d.docusign.com/oauth/token", privateKeyStream, 1)

Source: stackoverflow.com

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