Dart

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.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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
  // 
  // -------------------

  final crypt = CkCrypt2();

  // 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.hashAlgorithm = 'sha3-512';
  crypt.encodingMode = 'hex';

  final requestId = 'TSTKFT1222564';
  final timestamp = '2017-12-30T18:25:45.000Z';
  final signatureKey = 'ce-8f5e-215119fa7dd621DLMRHRLH2S';

  // Step 1: Concatenate requestId, UTC timestamp, and user's signature key.
  final sbFinalHashBase = CkStringBuilder();

  // First append the timestamp because we are going to remove certain chars/parts.
  sbFinalHashBase.append(timestamp);
  var numReplaced = sbFinalHashBase.replace('.000Z', '');
  numReplaced = sbFinalHashBase.replace('-', '');
  numReplaced = sbFinalHashBase.replace(':', '');
  numReplaced = sbFinalHashBase.replace('T', '');

  // Prepend the requestId and append the signatureKey
  sbFinalHashBase.prepend(requestId);
  sbFinalHashBase.append(signatureKey);

  // Step 2: Calculate first index hash.
  var invoiceOperation = 'CREATE';
  var invoiceData = 'QWJjZDEyMzQ=';

  final sbHashBase = CkStringBuilder();
  sbHashBase.append(invoiceOperation);
  sbHashBase.append(invoiceData);
  print('first hash base = ${sbHashBase.getAsString()}');

  final firstHash = crypt.hashStringENC(sbHashBase.getAsString());
  print('first hash = $firstHash');

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

  // Step 3: Calculate second index hash.
  invoiceOperation = 'MODIFY';
  invoiceData = 'RGNiYTQzMjE=';

  sbHashBase.clear();
  sbHashBase.append(invoiceOperation);
  sbHashBase.append(invoiceData);
  print('second hash base = ${sbHashBase.getAsString()}');

  final secondHash = crypt.hashStringENC(sbHashBase.getAsString());
  print('second hash = $secondHash');

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

  // Step 4: Append the uppercase hex hashes to the sbFinalHashBase
  sbFinalHashBase.append(firstHash);
  sbFinalHashBase.append(secondHash);
  print('sbFinalHashBase = ${sbFinalHashBase.getAsString()}');

  // Step 5: SHA3-512 hash to get the requestSignature
  final requestSignature = crypt.hashStringENC(sbFinalHashBase.getAsString());
  print('requestSignature = $requestSignature');

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