PHP

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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<?php

use Chilkat2\Jwe;
use Chilkat2\StringBuilder;

$jwe = new Jwe();

// Load the JWE compact serialization to be decrypted.
$jweCompact = 'eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>';
try {
    $jwe->LoadJwe($jweCompact);

    // 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=';
    $jwe->SetWrappingKey(0, $base64Key, 'base64');

    // Decrypt recipient index 0, writing the plaintext into a StringBuilder.
    $sbContent = new StringBuilder();
    $jwe->DecryptSb(0, 'utf-8', $sbContent);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $sbContent->GetAsString(), "\n";