B4X

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

See more ECC Examples

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

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

B4X

Dim success As Boolean = False

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

'  Load a PEM file into memory.
Dim sbPem As ChilkatStringBuilder
sbPem.Initialize
success = sbPem.LoadFile("qa_data/pem/ecc_privKey.pem", "utf-8")
If success <> True Then
    Log("Failed to load PEM file.")
    Return
End If


'  Load the PEM into a private key object.
Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = privKey.LoadPem(sbPem.GetAsString)
If success <> True Then
    Log(privKey.LastErrorText)
    Return
End If


'  Get the private key in JWK format:
Dim jwk As String = privKey.GetJwk

'  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:

Dim json As ChilkatJsonObject
json.Initialize
json.Load(jwk)
json.EmitCompact = False
Log("ECC Private Key in JWK format:")
Log(json.Emit)

'  Sample output:
'  { 
'    "kty": "EC",
'    "crv": "P-256",
'    "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
'    "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
'    "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
'  }
'  

'  Additional information can be added like this:
json.AppendString("use", "enc")
json.AppendString("kid", "123ABC")

'  Now examine the JSON:
Log(json.Emit)

'  { 
'    "kty": "EC",
'    "crv": "P-256",
'    "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
'    "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
'    "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM",
'    "use": "enc",
'    "kid": "123ABC"
'  }