B4X

Create JWT using a Certificate's Private Key

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using a certificate's private key. B4X

Dim success As Boolean = False

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

'  Demonstrates how to create a JWT using an certificate's private key.

Dim cert As ChilkatCert
cert.Initialize("cert")

'  Load an ECC private key from a PEM file.
success = cert.LoadPfxFile("c:/temp/myPfx.pfx", "pfxPassword")
If success <> True Then
    Log(cert.LastErrorText)
    Return
End If


Dim jwt As ChilkatJwt
jwt.Initialize

'  Build the JOSE header
Dim jose As ChilkatJsonObject
jose.Initialize
'  Note: The IsEcdsa function was added in Chilkat v10.1.0
If cert.IsEcdsa = True Then
    '  Use ES256.  Pass the string "ES384" or "ES512" to use ECC with SHA-384 or SHA-512.
    jose.AppendString("alg", "ES256")
Else
    '  Probably RSA...
    '  Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
    jose.AppendString("alg", "RS256")
End If


jose.AppendString("typ", "JWT")

'  Now build the JWT claims (also known as the payload)
Dim claims As ChilkatJsonObject
claims.Initialize
claims.AppendString("iss", "http://example.org")
claims.AppendString("sub", "John")
claims.AppendString("aud", "http://example.com")

'  Set the timestamp of when the JWT was created to now.
Dim curDateTime As Int = jwt.GenNumericDate(0)
claims.AddIntAt(-1, "iat", curDateTime)

'  Set the "not process before" timestamp to now.
claims.AddIntAt(-1, "nbf", curDateTime)

'  Set the timestamp defining an expiration time (end time) for the token
'  to be now + 1 hour (3600 seconds)
claims.AddIntAt(-1, "exp", curDateTime + 3600)

'  Produce the smallest possible JWT:
jwt.AutoCompact = True

'  Create the JWT token.
Dim token As String = jwt.CreateJwtCert(jose.Emit, claims.Emit, cert)

Log(token)

'  Example output:
'  eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q