Lianja

Decrypt a JWE into a StringBuilder

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.DecryptSb, which decrypts a recipient of a loaded JWE and writes the plaintext into a StringBuilder.

Background. The recipient index selects which recipient's key material to use. The key for that recipient must be provided before decrypting.

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llSuccess = .F.

loJwe = createobject("CkJwe")

//  Load the JWE compact serialization to be decrypted.
lcJweCompact = "eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>"
llSuccess = loJwe.LoadJwe(lcJweCompact)
if (llSuccess = .F.) then
    ? loJwe.LastErrorText
    release loJwe
    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
    return
endif

//  Decrypt recipient index 0, writing the plaintext into a StringBuilder.
loSbContent = createobject("CkStringBuilder")
llSuccess = loJwe.DecryptSb(0,"utf-8",loSbContent)
if (llSuccess = .F.) then
    ? loJwe.LastErrorText
    release loJwe
    release loSbContent
    return
endif

? loSbContent.GetAsString()


release loJwe
release loSbContent