Set a Per-Recipient JWE Header

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetRecipientHeader, which sets the per-recipient unprotected header for a recipient index.

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 the per-recipient unprotected header for recipient 0, for example a key id used to identify
#  which key a recipient should use.
recipHeader = Chilkat::CkJsonObject.new()
recipHeader.UpdateString("kid","recipient-key-1")
success = jwe.SetRecipientHeader(0,recipHeader)
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";