Unicode C

Sign String to create a CAdES-T Signature

See more CAdES Examples

This example will sign a string to create a CAdEST-T signature.

Note: This example requires Chilkat v9.5.0.78 or greater.

Unicode C

#include <C_CkCrypt2W.h>
#include <C_CkCertW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCrypt2W crypt;
    HCkCertW cert;
    HCkJsonObjectW attrs;
    const wchar_t *strToSign;
    HCkBinDataW bd;

    success = FALSE;

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

    crypt = CkCrypt2W_Create();

    // This example will use the certificate + private key currently inserted into a smartcard reader.
    cert = CkCertW_Create();

    // If we wish to provide the smartcard PIN (otherwise the user will be prompted by the operating system).
    CkCertW_putSmartCardPin(cert,L"000000");
    success = CkCertW_LoadFromSmartcard(cert,L"");
    if (success != TRUE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        return;
    }

    // Note: It is also possible to use certs from .pfx/.p12, .pem, or other sources such as 
    // pre-installed Windows certificates.

    success = CkCrypt2W_SetSigningCert(crypt,cert);

    // Use SHA-256 rather than the default of SHA-1
    CkCrypt2W_putHashAlgorithm(crypt,L"sha256");

    // Create JSON that tells Chilkat what signing attributes to include:
    attrs = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateBool(attrs,L"contentType",TRUE);
    CkJsonObjectW_UpdateBool(attrs,L"signingTime",TRUE);
    CkJsonObjectW_UpdateBool(attrs,L"messageDigest",TRUE);
    CkJsonObjectW_UpdateBool(attrs,L"signingCertificateV2",TRUE);

    // A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
    // We must include the TSA's URL, as well as a few options to indicate what is desired.
    // Except for the TSA URL, the options shown here are typically what you would need.
    CkJsonObjectW_UpdateBool(attrs,L"timestampToken.enabled",TRUE);
    CkJsonObjectW_UpdateString(attrs,L"timestampToken.tsaUrl",L"https://freetsa.org/tsr");
    CkJsonObjectW_UpdateBool(attrs,L"timestampToken.addNonce",FALSE);
    CkJsonObjectW_UpdateBool(attrs,L"timestampToken.requestTsaCert",TRUE);
    CkJsonObjectW_UpdateString(attrs,L"timestampToken.hashAlg",L"sha256");

    CkCrypt2W_putSigningAttributes(crypt,CkJsonObjectW_emit(attrs));

    strToSign = L"THIS IS MY ID";

    bd = CkBinDataW_Create();
    CkBinDataW_AppendString(bd,strToSign,L"utf-8");

    // This creates the CAdES-T signature.  During the signature creation, it
    // communicates with the TSA to get a timestampToken.
    // The contents of bd are signed and replaced with the CAdES-T signature (which embeds the original content).
    success = CkCrypt2W_OpaqueSignBd(crypt,bd);
    if (success != TRUE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkCrypt2W_Dispose(crypt);
        CkCertW_Dispose(cert);
        CkJsonObjectW_Dispose(attrs);
        CkBinDataW_Dispose(bd);
        return;
    }

    // Get the signature in base64 format:
    wprintf(L"%s\n",CkBinDataW_getEncoded(bd,L"base64_mime"));

    // Or save the signature to a file.
    CkBinDataW_WriteFile(bd,L"qa_output/cades-t_sample.p7m");

    wprintf(L"Success.\n");


    CkCrypt2W_Dispose(crypt);
    CkCertW_Dispose(cert);
    CkJsonObjectW_Dispose(attrs);
    CkBinDataW_Dispose(bd);

    }