Set JWE Additional Authenticated Data

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetAad, which sets external Additional Authenticated Data (AAD) for a JWE being encrypted, encoding the supplied text with the given charset.

require 'chilkat'

success = false

jwe = Chilkat::CkJwe.new()

#  Protected header: AES key-wrap with AES-256-GCM content encryption.
header = Chilkat::CkJsonObject.new()
header.UpdateString("alg","A256KW")
header.UpdateString("enc","A256GCM")
success = jwe.SetProtectedHeader(header)
if (success == false)
    print jwe.lastErrorText() + "\n";
    exit
end

#  The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key from a
#  secure source rather than hard-coding it.
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jwe.SetWrappingKey(0,base64Key,"base64")
if (success == false)
    print jwe.lastErrorText() + "\n";
    exit
end

#  Set external Additional Authenticated Data (AAD).  The AAD is integrity-protected but not
#  encrypted, and must be supplied again when decrypting.
success = jwe.SetAad("context-info-v1","utf-8")
if (success == false)
    print jwe.lastErrorText() + "\n";
    exit
end

sbContent = Chilkat::CkStringBuilder.new()
sbContent.Append("This is the secret content.")
sbJwe = Chilkat::CkStringBuilder.new()
success = jwe.EncryptSb(sbContent,"utf-8",sbJwe)
if (success == false)
    print jwe.lastErrorText() + "\n";
    exit
end

print sbJwe.getAsString() + "\n";