Zig

Hungary NAV Invoicing Signature Calculation

See more Hungary NAV Invoicing Examples

Demonstrates the requestSignature calculation for the Hungarian NAV Online Invoicing System REST API v2.0.

Note: This example requires Chilkat v9.5.0.83 or greater.

Zig

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

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

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // This example performs the following calculation:

    // 1.5.1 Calculations for manageInvoice and manageAnnulment operations
    //
    // For the manageInvoice and manageAnnulment operations comprising the core of requestSignature,
    // requestSignature is calculated using partial authentication, concatenating the hash values for
    // indices 1-100 as well as additional SHA3-512 hash operations. The partial authentication can be
    // derived by concatenating the following values:
    //
    //   - requestId value
    //   - UTC timestamp tag value using a YYYYMMDDhhmmss mask
    //   - string literal of the technical user�s signature key
    //
    // When concatenating, the date and time separators as well as the time zone must be removed for timestamp masking.
    //
    // The index hash value can be derived from the uppercase SHA3-512 hash values following the concatenation of the
    // operation and base64 content for the individual indices:
    //
    //   - literal value of invoiceOperation or annulmentOperation
    //   - base64 content in the invoiceData or invoiceAnnulment tag
    //
    // The calculated hash values should be appended after the partial hash, in the order corresponding to the indices.
    // The SHA3-512 hash result (capitals) of the string thus concatenated yields the requestSignature value.
    //
    // A fictitious example for request data:
    //
    //     - requestId = TSTKFT1222564
    //     - timestamp = 2017-12-30T18:25:45.000Z
    //     - technical user�s signature key = ce-8f5e-215119fa7dd621DLMRHRLH2S
    //     - the index#1 invoice data items
    //     - invoiceOperation = CREATE
    //     - invoiceData = QWJjZDEyMzQ=
    //     - the index#2 invoice data items
    //     - invoiceOperation = MODIFY
    //     - invoiceData = RGNiYTQzMjE=
    //     - partial authentication value = TSTKFT122256420171230182545ce-8f5e-215119fa7dd621DLMRHRLH2S
    //     - the first index hash =
    //         - hash base = CREATEQWJjZDEyMzQ=
    //         - lowercase hash = 4317798460962869bc67f07c48ea7e4a3afa301513ceb87b8eb94ecf92bc220a89c480f87f0860e85e29a3b6c0463d4f29712c5ad48104a6486ce839dc2f24cb
    //         - uppercase hash = 4317798460962869BC67F07C48EA7E4A3AFA301513CEB87B8EB94ECF92BC220A89C480F87F0860E85E29A3B6C0463D4F29712C5AD48104A6486CE839DC2F24CB
    //     - the second index hash =
    //         - hash base = MODIFYRGNiYTQzMjE=
    //         - lowercase hash = a881218238933f6ffb9e167445cb4daa9749bcf484fde48ab7649fd25e8b634a4736a65a7c4a8e2831119f739837e006566f97370415aad55e268605206f2a6c
    //         - uppercase hash = A881218238933F6FFB9E167445CB4DAA9749BCF484FDE48AB7649FD25E8B634A4736A65A7C4A8E2831119F739837E006566F97370415AAD55E268605206F2A6C
    //
    // Thus, the base for the entire requestSignature is:
    //     TSTKFT122256420171230182545ce-8f5e-215119fa7dd621DLMRHRLH2S4317798460962869BC67F07C48EA7E4A3AFA301513CEB87B8EB94ECF92BC220A89C480F87F0860E85E29A3B6C0463D4F29712C5AD48104A6486CE839DC2F24CBA881218238933F6FFB9E167445CB4DAA9749BCF484FDE48AB7649FD25E8B634A4736A65A7C4A8E2831119F739837E006566F97370415AAD55E268605206F2A6C
    //
    // Value of requestSignature after SHA3-512 hashing and converting to uppercase:
    //     60BC80609EE3B8F42FE904200A49A1921A1DADA08D55319ACD40C59F626514B74EEA49011D372600A10DBCF8199D590DA9C2841D987308F2D83DAE17C2470C42
    //
    // -------------------

    const crypt = try chilkat.Crypt2.init();
    defer crypt.deinit();

    // IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
    // IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
    // IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
    // IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
    // IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
    crypt.setHashAlgorithm("sha3-512");
    crypt.setEncodingMode("hex");

    const request_id = "TSTKFT1222564";
    const timestamp = "2017-12-30T18:25:45.000Z";
    const signature_key = "ce-8f5e-215119fa7dd621DLMRHRLH2S";

    // Step 1: Concatenate requestId, UTC timestamp, and user's signature key.
    const sb_final_hash_base = try chilkat.StringBuilder.init();
    defer sb_final_hash_base.deinit();

    // First append the timestamp because we are going to remove certain chars/parts.
    sb_final_hash_base.append(timestamp) catch {};
    var num_replaced: i32 = sb_final_hash_base.replace(".000Z", "");
    num_replaced = sb_final_hash_base.replace("-", "");
    num_replaced = sb_final_hash_base.replace(":", "");
    num_replaced = sb_final_hash_base.replace("T", "");

    // Prepend the requestId and append the signatureKey
    sb_final_hash_base.prepend(request_id) catch {};
    sb_final_hash_base.append(signature_key) catch {};

    // Step 2: Calculate first index hash.
    var invoice_operation: [:0]const u8 = "CREATE";
    var invoice_data: [:0]const u8 = "QWJjZDEyMzQ=";

    const sb_hash_base = try chilkat.StringBuilder.init();
    defer sb_hash_base.deinit();
    sb_hash_base.append(invoice_operation) catch {};
    sb_hash_base.append(invoice_data) catch {};
    std.debug.print("first hash base = {s}\n", .{try sb_hash_base.getAsString(alloc)});

    const first_hash = try crypt.hashStringENC(alloc, try sb_hash_base.getAsString(alloc));
    std.debug.print("first hash = {s}\n", .{first_hash});

    // Output should be:
    // first hash base = CREATEQWJjZDEyMzQ=
    // first hash = 4317798460962869BC67F07C48EA7E4A3AFA301513CEB87B8EB94ECF92BC220A89C480F87F0860E85E29A3B6C0463D4F29712C5AD48104A6486CE839DC2F24CB

    // Step 3: Calculate second index hash.
    invoice_operation = "MODIFY";
    invoice_data = "RGNiYTQzMjE=";

    sb_hash_base.clear();
    sb_hash_base.append(invoice_operation) catch {};
    sb_hash_base.append(invoice_data) catch {};
    std.debug.print("second hash base = {s}\n", .{try sb_hash_base.getAsString(alloc)});

    const second_hash = try crypt.hashStringENC(alloc, try sb_hash_base.getAsString(alloc));
    std.debug.print("second hash = {s}\n", .{second_hash});

    // Output should be:
    // second hash base = MODIFYRGNiYTQzMjE=
    // second hash = A881218238933F6FFB9E167445CB4DAA9749BCF484FDE48AB7649FD25E8B634A4736A65A7C4A8E2831119F739837E006566F97370415AAD55E268605206F2A6C

    // Step 4: Append the uppercase hex hashes to the sbFinalHashBase
    sb_final_hash_base.append(first_hash) catch {};
    sb_final_hash_base.append(second_hash) catch {};
    std.debug.print("sbFinalHashBase = {s}\n", .{try sb_final_hash_base.getAsString(alloc)});

    // Step 5: SHA3-512 hash to get the requestSignature
    const request_signature = try crypt.hashStringENC(alloc, try sb_final_hash_base.getAsString(alloc));
    std.debug.print("requestSignature = {s}\n", .{request_signature});

    // Output should be:
    // requestSignature = 60BC80609EE3B8F42FE904200A49A1921A1DADA08D55319ACD40C59F626514B74EEA49011D372600A10DBCF8199D590DA9C2841D987308F2D83DAE17C2470C42
}