Ruby

Create a JWS into a StringBuilder

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJwsSb, which creates a JWS and writes it into a StringBuilder.

Background. JWS (JSON Web Signature) integrity-protects a payload with a signature or MAC. The header alg names the algorithm; this example uses HMAC-SHA256 (HS256) with a symmetric MAC key.

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Ruby

require 'chilkat'

success = false

jws = Chilkat::CkJws.new()

#  Set the protected header for signer 0, specifying the signature algorithm (alg).
header = Chilkat::CkJsonObject.new()
header.UpdateString("alg","HS256")
success = jws.SetProtectedHeader(0,header)
if (success == false)
    print jws.lastErrorText() + "\n";
    exit
end

#  Set the payload to be signed.
bIncludeBom = false
success = jws.SetPayload("This is the content to sign.","utf-8",bIncludeBom)
if (success == false)
    print jws.lastErrorText() + "\n";
    exit
end

#  Provide the HMAC key (base64) for signer 0.  In production, obtain the key from a secure source
#  rather than hard-coding it.
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0,base64Key,"base64")
if (success == false)
    print jws.lastErrorText() + "\n";
    exit
end

#  Create the JWS and write it into a StringBuilder.
sbJws = Chilkat::CkStringBuilder.new()
success = jws.CreateJwsSb(sbJws)
if (success == false)
    print jws.lastErrorText() + "\n";
    exit
end

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