(C++) Plaza API (bol.com) HMAC-SHA256 Authentication

Demonstrates how to compute the Authorization header for bol.com using HMAC-SHA256.

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#include <CkCrypt2.h>
#include <CkStringBuilder.h>

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

    CkCrypt2 crypt;

    crypt.put_EncodingMode("base64");
    crypt.put_HashAlgorithm("sha256");
    crypt.put_MacAlgorithm("hmac");

    const char *publicKey = "oRNWbHFXtAECmhnZmEndcjLIaSKbRMVE";
    const char *privateKey = "MaQHPOnmYkPZNgeRziPnQyyOJYytUbcFBVJBvbMKoDdpPqaZbaOiLUTWzPAkpPsZFZbJHrcoltdgpZolyNcgvvBaKcmkqFjucFzXhDONTsPAtHHyccQlLUZpkOuywMiOycDWcCySFsgpDiyGnCWCZJkNTtVdPxbSUTWVIFQiUxaPDYDXRQAVVTbSVZArAZkaLDLOoOvPzxSdhnkkJWzlQDkqsXNKfAIgAldrmyfROSyCGMCfvzdQdUQEaYZTPEoA";

    // The string to sign is this:
    // http_verb +'\n\n'+ content_type +'\n'+ x_bol_date +'\n'+ 'x-bol-date:'+ x_bol_date +'\n'+ uri

    const char *http_verb = "GET";
    const char *content_type = "application/xml";
    const char *x_bol_date = "Wed, 17 Feb 2016 00:00:00 GMT";
    const char *uri = "/services/rest/orders/v2";

    // IMPORTANT: Notice the use of underscore and hyphen (dash) chars in x-bol-date vs. x_bol_date.
    // In one place hypens are used.  In two places, underscore chars are used.
    CkStringBuilder sb;
    sb.Append(http_verb);
    sb.Append("\n\n");
    sb.Append(content_type);
    sb.Append("\n");
    sb.Append(x_bol_date);
    sb.Append("\nx-bol-date:");
    sb.Append(x_bol_date);
    sb.Append("\n");
    sb.Append(uri);
    std::cout << "[" << sb.getAsString() << "]" << "\r\n";

    // Set the HMAC key:
    crypt.SetMacKeyEncoded(privateKey,"ascii");
    const char *mac = crypt.macStringENC(sb.getAsString());

    // The answer should be: nqzLWvXI1eBhBXrRx5NF23V5hS8Q1xWCloJzPi/RAts=
    std::cout << mac << "\r\n";

    // The last step is to append the public key with the signature
    CkStringBuilder sbHeader;
    sbHeader.Append(publicKey);
    sbHeader.Append(":");
    sbHeader.Append(mac);

    const char *hdrValue = sbHeader.getAsString();
    std::cout << hdrValue << "\r\n";
    }