C

Convert ASN.1 to/from Binary DER, XML, and Base64

Demonstrates how to convert ASN.1 from and to any of the following formats: binary DER, Base64, and XML. C

#include <C_CkAsn.h>
#include <C_CkXml.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkAsn asn;
    const char *strXml;
    HCkXml xml;
    const char *strBase64;
    HCkAsn asn2;
    HCkAsn asn3;

    success = FALSE;

    asn = CkAsn_Create();

    //  Begin with loading ASN.1 from a binary DER/BER format file.
    success = CkAsn_LoadBinaryFile(asn,"/Users/chilkat/testData/p7b/test.p7b");
    if (success != TRUE) {
        printf("%s\n",CkAsn_lastErrorText(asn));
        CkAsn_Dispose(asn);
        return;
    }

    //  Convert ASN.1 to XML:
    strXml = CkAsn_asnToXml(asn);
    if (CkAsn_getLastMethodSuccess(asn) != TRUE) {
        printf("%s\n",CkAsn_lastErrorText(asn));
        CkAsn_Dispose(asn);
        return;
    }

    //  The XML returned by AsnToXml will be compact and not pretty-formatted.
    //  Use Chilkat XML to format the XML better:
    xml = CkXml_Create();
    success = CkXml_LoadXml(xml,strXml);
    //  Assuming success for this example..
    //  This is formatted better for human viewing:
    printf("%s\n",CkXml_getXml(xml));

    //  Now get the ASN.1 in base64 format.  Any encoding supported
    //  by Chilkat can be passed, such as "hex", "uu", "quoted-printable", "base32", "modbase64", etc.
    strBase64 = CkAsn_getEncodedDer(asn,"base64");

    //  Load the ASN.1 from XML:
    asn2 = CkAsn_Create();
    success = CkAsn_LoadAsnXml(asn2,CkXml_getXml(xml));
    if (success != TRUE) {
        printf("%s\n",CkAsn_lastErrorText(asn2));
        CkAsn_Dispose(asn);
        CkXml_Dispose(xml);
        CkAsn_Dispose(asn2);
        return;
    }

    //  Load the ASN.1 from an encoded string, such as base64:
    asn3 = CkAsn_Create();
    success = CkAsn_LoadEncoded(asn3,strBase64,"base64");
    if (success != TRUE) {
        printf("%s\n",CkAsn_lastErrorText(asn3));
        CkAsn_Dispose(asn);
        CkXml_Dispose(xml);
        CkAsn_Dispose(asn2);
        CkAsn_Dispose(asn3);
        return;
    }



    CkAsn_Dispose(asn);
    CkXml_Dispose(xml);
    CkAsn_Dispose(asn2);
    CkAsn_Dispose(asn3);

    }