SQL Server

Get ECC Public Key in JWK Format (JSON Web Key)

See more ECC Examples

Demonstrates how to get an ECC public key in JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    -- Note: This example requires Chilkat v9.5.0.66 or later.

    -- Load a PEM file into memory.
    DECLARE @sbPem int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbPem OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OAMethod @sbPem, 'LoadFile', @success OUT, 'qa_data/pem/ecc_public.pem', 'utf-8'
    IF @success <> 1
      BEGIN

        PRINT 'Failed to load PEM file.'
        EXEC @hr = sp_OADestroy @sbPem
        RETURN
      END

    -- Load the PEM into a public key object.
    DECLARE @pubKey int
    EXEC @hr = sp_OACreate 'Chilkat.PublicKey', @pubKey OUT

    EXEC sp_OAMethod @sbPem, 'GetAsString', @sTmp0 OUT
    EXEC sp_OAMethod @pubKey, 'LoadFromString', @success OUT, @sTmp0
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @pubKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbPem
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END

    -- Get the public key in JWK format:
    DECLARE @jwk nvarchar(4000)
    EXEC sp_OAMethod @pubKey, 'GetJwk', @jwk OUT

    -- The GetJwk method will return the JWK in the most compact JSON format possible,
    -- as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
    -- load into a Chilkat JSON object and emit non-compact:

    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT

    EXEC sp_OAMethod @json, 'Load', @success OUT, @jwk
    EXEC sp_OASetProperty @json, 'EmitCompact', 0

    PRINT 'ECC Public Key in JWK format:'
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- Sample output:
    -- { 
    --   "kty": "EC",
    --   "crv": "P-256",
    --   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
    --   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU"
    -- }
    -- 
    -- Additional information can be added like this:
    EXEC sp_OAMethod @json, 'AppendString', @success OUT, 'use', 'enc'
    EXEC sp_OAMethod @json, 'AppendString', @success OUT, 'kid', '123ABC'

    -- Now examine the JSON:
    EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
    PRINT @sTmp0

    -- { 
    --   "kty": "EC",
    --   "crv": "P-256",
    --   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
    --   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
    --   "use": "enc",
    --   "kid": "123ABC"
    -- }

    EXEC @hr = sp_OADestroy @sbPem
    EXEC @hr = sp_OADestroy @pubKey
    EXEC @hr = sp_OADestroy @json


END
GO