(Tcl) Load ECC Private Key from JWK Format (JSON Web Key)

Demonstrates how to load an ECC private key from JWK (JSON Web Key) format.

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

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load ./chilkat.dll

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

# First build a JWK sample to load..
set json [new_CkJsonObject]

CkJsonObject_UpdateString $json "kty" "EC"
CkJsonObject_UpdateString $json "crv" "P-256"
CkJsonObject_UpdateString $json "x" "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE"
CkJsonObject_UpdateString $json "y" "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU"
CkJsonObject_UpdateString $json "d" "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"

# The JSON contains the following:
# { 
#   "kty": "EC",
#   "crv": "P-256",
#   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
#   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
#   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
# }

# Note: The JSON can contain other members, such as "use", "kid", or anything else.  These will be ignored.
CkJsonObject_put_EmitCompact $json 0

# Show the JWK string to be loaded:
set jwkStr [CkJsonObject_emit $json]

set privKey [new_CkPrivateKey]

set success [CkPrivateKey_LoadJwk $privKey $jwkStr]
if {$success != 1} then {
    puts [CkPrivateKey_lastErrorText $privKey]
    delete_CkJsonObject $json
    delete_CkPrivateKey $privKey
    exit
}

# OK.. the JWK is loaded.  It can be used in whatever way desired...

# The key can be retrieved in any other format, such as XML or PEM..
puts [CkPrivateKey_getXml $privKey]

# XML output:
# <ECCKeyValue curve="secp256r1">MHcCAQEEIBG1c3z52T8XwMsahGVdOZWgKCQJfv+l7djuJjgetdbDoAoGCCqGSM49AwEHoEQDQgAEoBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxG+9DLFmRSMlBQ9T/RsLLc+PmpB1+7yPAR+oR5gZn3kJQ==</ECCKeyValue>

puts [CkPrivateKey_getPkcs8EncryptedPem $privKey secret]

# PEM output
# 
# -----BEGIN ENCRYPTED PRIVATE KEY-----
# MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAiku9rUjavLQQICCAAw
# FAYIKoZIhvcNAwcECGsl/5nLai+JBIGAVIqKAdfcRQNLl1t3x+n8OZ92d1H+qgjS
# Hs83wn2joJK4nlqy+rzosZxQ3e8NTJQyUEWZWcjqMj/N0phS3QWtcD/qbda5oEcv
# QgtU60cZ4ql3truefAmlZz2PdpOfqtYhxlvjJQxnyojn4ntj69OwLOt9SZbaBQQi
# KUL8KXT4Pq8=
# -----END ENCRYPTED PRIVATE KEY-----

delete_CkJsonObject $json
delete_CkPrivateKey $privKey