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.

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const jwe = try chilkat.Jwe.init();
    defer jwe.deinit();

    // Load the JWE compact serialization to be decrypted.
    const jwe_compact = "eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>";
    jwe.loadJwe(jwe_compact) catch {
        std.debug.print("{s}\n", .{try jwe.getLastErrorText(alloc)});
        return;
    };

    // 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.
    const base64_key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
    jwe.setWrappingKey(0, base64_key, "base64") catch {
        std.debug.print("{s}\n", .{try jwe.getLastErrorText(alloc)});
        return;
    };

    // Decrypt recipient index 0, writing the plaintext into a StringBuilder.
    const sb_content = try chilkat.StringBuilder.init();
    defer sb_content.deinit();
    jwe.decryptSb(0, "utf-8", sb_content) catch {
        std.debug.print("{s}\n", .{try jwe.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("{s}\n", .{try sb_content.getAsString(alloc)});
}