(C) Hungary NAV Invoicing Signature Calculation

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.

For more information, see https://onlineszamla.nav.gov.hu/api/files/container/download/Online%20Szamla_Interfesz%20specifik%C3%A1ci%C3%B3_EN_v2.0.pdf

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#include <C_CkCrypt2.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2 crypt;
    const char *requestId;
    const char *timestamp;
    const char *signatureKey;
    HCkStringBuilder sbFinalHashBase;
    int numReplaced;
    const char *invoiceOperation;
    const char *invoiceData;
    HCkStringBuilder sbHashBase;
    const char *firstHash;
    const char *secondHash;
    const char *requestSignature;

    // 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 users 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 users 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
    // 
    // -------------------

    crypt = CkCrypt2_Create();

    // 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.
    CkCrypt2_putHashAlgorithm(crypt,"sha3-512");
    CkCrypt2_putEncodingMode(crypt,"hex");

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

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

    // First append the timestamp because we are going to remove certain chars/parts.
    CkStringBuilder_Append(sbFinalHashBase,timestamp);
    numReplaced = CkStringBuilder_Replace(sbFinalHashBase,".000Z","");
    numReplaced = CkStringBuilder_Replace(sbFinalHashBase,"-","");
    numReplaced = CkStringBuilder_Replace(sbFinalHashBase,":","");
    numReplaced = CkStringBuilder_Replace(sbFinalHashBase,"T","");

    // Prepend the requestId and append the signatureKey
    CkStringBuilder_Prepend(sbFinalHashBase,requestId);
    CkStringBuilder_Append(sbFinalHashBase,signatureKey);

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

    sbHashBase = CkStringBuilder_Create();
    CkStringBuilder_Append(sbHashBase,invoiceOperation);
    CkStringBuilder_Append(sbHashBase,invoiceData);
    printf("first hash base = %s\n",CkStringBuilder_getAsString(sbHashBase));

    firstHash = CkCrypt2_hashStringENC(crypt,CkStringBuilder_getAsString(sbHashBase));
    printf("first hash = %s\n",firstHash);

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

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

    CkStringBuilder_Clear(sbHashBase);
    CkStringBuilder_Append(sbHashBase,invoiceOperation);
    CkStringBuilder_Append(sbHashBase,invoiceData);
    printf("second hash base = %s\n",CkStringBuilder_getAsString(sbHashBase));

    secondHash = CkCrypt2_hashStringENC(crypt,CkStringBuilder_getAsString(sbHashBase));
    printf("second hash = %s\n",secondHash);

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

    // Step 4: Append the uppercase hex hashes to the sbFinalHashBase
    CkStringBuilder_Append(sbFinalHashBase,firstHash);
    CkStringBuilder_Append(sbFinalHashBase,secondHash);
    printf("sbFinalHashBase = %s\n",CkStringBuilder_getAsString(sbFinalHashBase));

    // Step 5: SHA3-512 hash to get the requestSignature
    requestSignature = CkCrypt2_hashStringENC(crypt,CkStringBuilder_getAsString(sbFinalHashBase));
    printf("requestSignature = %s\n",requestSignature);

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


    CkCrypt2_Dispose(crypt);
    CkStringBuilder_Dispose(sbFinalHashBase);
    CkStringBuilder_Dispose(sbHashBase);

    }