Lianja

Encrypt Binary Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptBd, which encrypts binary content held in a BinData and writes the resulting JWE into a StringBuilder.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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llSuccess = .F.

loJwe = createobject("CkJwe")

//  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
//  encryption algorithm (enc).
loHeader = createobject("CkJsonObject")
loHeader.UpdateString("alg","A256KW")
loHeader.UpdateString("enc","A256GCM")
llSuccess = loJwe.SetProtectedHeader(loHeader)
if (llSuccess = .F.) then
    ? loJwe.LastErrorText
    release loJwe
    release loHeader
    return
endif

//  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.
lcBase64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
llSuccess = loJwe.SetWrappingKey(0,lcBase64Key,"base64")
if (llSuccess = .F.) then
    ? loJwe.LastErrorText
    release loJwe
    release loHeader
    return
endif

//  Encrypt binary content held in a BinData, writing the resulting JWE into a StringBuilder.
loBdContent = createobject("CkBinData")
loBdContent.AppendString("Binary content to encrypt.","utf-8")

loSbJwe = createobject("CkStringBuilder")
llSuccess = loJwe.EncryptBd(loBdContent,loSbJwe)
if (llSuccess = .F.) then
    ? loJwe.LastErrorText
    release loJwe
    release loHeader
    release loBdContent
    release loSbJwe
    return
endif

? loSbJwe.GetAsString()


release loJwe
release loHeader
release loBdContent
release loSbJwe