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(SQL Server) Verify JWT Using an ECC Public Key (ES256, ES384, ES512)

Demonstrates how to verify a JWT that was signed using an ECC private key.

This example verifies the ECC signature. It also does the following:

  • Checks to see if the time constraints ("nbf" and "exp") are valid.
  • Recovers the original JOSE header.
  • Recovers the original claims JSON.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    --  Demonstrates how to verify an JWT using an ECC public key.

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

    DECLARE @pubKey int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.PublicKey', @pubKey OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    EXEC sp_OAMethod @pubKey, 'LoadFromFile', @success OUT, 'qa_data/pem/ecc_public.pem'

    DECLARE @jwt int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Jwt', @jwt OUT

    DECLARE @token nvarchar(4000)
    SELECT @token = 'eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q'

    --  First verify the signature.
    DECLARE @sigVerified int
    EXEC sp_OAMethod @jwt, 'VerifyJwtPk', @sigVerified OUT, @token, @pubKey

    PRINT 'verified: ' + @sigVerified

    --  Let's see if the time constraints, if any, are valid.
    --  The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
    --  If the current system time is before the "nbf" time, or after the "exp" time,
    --  then IsTimeValid will return false/0.
    --  Also, we'll allow a leeway of 60 seconds to account for any clock skew.
    --  Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
    DECLARE @leeway int
    SELECT @leeway = 60
    DECLARE @bTimeValid int
    EXEC sp_OAMethod @jwt, 'IsTimeValid', @bTimeValid OUT, @token, @leeway

    PRINT 'time constraints valid: ' + @bTimeValid

    --  Now let's recover the original claims JSON (the payload).
    DECLARE @payload nvarchar(4000)
    EXEC sp_OAMethod @jwt, 'GetPayload', @payload OUT, @token
    --  The payload will likely be in compact form:

    PRINT @payload

    --  We can format for human viewing by loading it into Chilkat's JSON object
    --  and emit.
    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.JsonObject', @json OUT

    EXEC sp_OAMethod @json, 'Load', @success OUT, @payload
    EXEC sp_OASetProperty @json, 'EmitCompact', 0
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    --  We can recover the original JOSE header in the same way:
    DECLARE @joseHeader nvarchar(4000)
    EXEC sp_OAMethod @jwt, 'GetHeader', @joseHeader OUT, @token
    --  The payload will likely be in compact form:

    PRINT @joseHeader

    --  We can format for human viewing by loading it into Chilkat's JSON object
    --  and emit.
    EXEC sp_OAMethod @json, 'Load', @success OUT, @joseHeader
    EXEC sp_OASetProperty @json, 'EmitCompact', 0
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    EXEC @hr = sp_OADestroy @pubKey
    EXEC @hr = sp_OADestroy @jwt
    EXEC @hr = sp_OADestroy @json


END
GO

 

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