(Tcl) Create JWT Using Ed25519 Private Key (EdDSA)

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using an Ed25519 private key. If the private key is Ed25519, which is an EdDSA algorithm, the JOSE header's "alg" member should be set to "EdDSA".

Note: This example requires Chilkat v9.5.0.95 or greater.

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load ./chilkat.dll

# 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 Ed25519 private key.

set privKey [new_CkPrivateKey]

# Load an Ed25519 (EdDSA) private key from a PEM file.
set success [CkPrivateKey_LoadPemFile $privKey "qa_data/eddsa/ed25519.pem"]
if {$success != 1} then {
    puts [CkPrivateKey_lastErrorText $privKey]
    delete_CkPrivateKey $privKey
    exit
}

set jwt [new_CkJwt]

# Build the JOSE header
set jose [new_CkJsonObject]

# -----------------------------------------------------------------
# Note: This example requires Chilkat v9.5.0.95 or greater.
# -----------------------------------------------------------------
set success [CkJsonObject_AppendString $jose "alg" "EdDSA"]
set success [CkJsonObject_AppendString $jose "typ" "JWT"]

# Now build the JWT claims (also known as the payload)
set claims [new_CkJsonObject]

set success [CkJsonObject_AppendString $claims "iss" "http://example.org"]
set success [CkJsonObject_AppendString $claims "sub" "John"]
set success [CkJsonObject_AppendString $claims "aud" "http://example.com"]

# (optional) Set the timestamp of when the JWT was created to now.
set curDateTime [CkJwt_GenNumericDate $jwt 0]
set success [CkJsonObject_AddIntAt $claims -1 "iat" $curDateTime]

# (optional)  Set the "not process before" timestamp to now.
set success [CkJsonObject_AddIntAt $claims -1 "nbf" $curDateTime]

# (optional)  Set the timestamp defining an expiration time (end time) for the token
# to be now + 1 hour (3600 seconds)
set success [CkJsonObject_AddIntAt $claims -1 "exp" [expr $curDateTime + 3600]]

# Produce the smallest possible JWT:
CkJwt_put_AutoCompact $jwt 1

# Create the JWT token.
set token [CkJwt_createJwtPk $jwt [CkJsonObject_emit $jose] [CkJsonObject_emit $claims] $privKey]

puts "$token"

# Example output:
# eyJhbGciOiJFZERTQSIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNjg3OTcwNjgyLCJuYmYiOjE2ODc5NzA2ODIsImV4cCI6MTY4Nzk3NDI4Mn0.eyfrDJfuWJSJVJPfAUYb_p_c-LF_YULHGRaZx82MLLjMLCCFEEGckp8icuayf5bLW9ah20LzYYt0JgOBIB0RDg

delete_CkPrivateKey $privKey
delete_CkJwt $jwt
delete_CkJsonObject $jose
delete_CkJsonObject $claims