C

Binary Certificate Extension Data

See more Certificates Examples

Demonstrates how to binary certificate extension data by OID.

The GetExtensionBd method is added in Chilkat v9.5.0.96.

C

#include <C_CkCert.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCert cert;
    HCkBinData bd;
    const char *oid;
    const char *strXml;

    success = FALSE;

    cert = CkCert_Create();

    success = CkCert_LoadFromFile(cert,"qa_data/certs/testCert.cer");
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCert_Dispose(cert);
        return;
    }

    bd = CkBinData_Create();

    // The particular certificate in this test contains the following extensions

    oid = "1.2.250.1.71.1.2.5";
    success = CkCert_GetExtensionBd(cert,oid,bd);
    if (success == TRUE) {
        printf("%s: %s\n",oid,CkBinData_getEncoded(bd,"hex_lower"));
    }

    oid = "1.2.250.1.71.1.2.2";
    success = CkCert_GetExtensionBd(cert,oid,bd);
    if (success == TRUE) {
        printf("%s: %s\n",oid,CkBinData_getEncoded(bd,"hex_lower"));
    }

    oid = "1.2.250.1.71.1.2.3";
    success = CkCert_GetExtensionBd(cert,oid,bd);
    if (success == TRUE) {
        printf("%s: %s\n",oid,CkBinData_getEncoded(bd,"hex_lower"));
    }

    oid = "1.2.250.1.71.1.2.7";
    success = CkCert_GetExtensionBd(cert,oid,bd);
    if (success == TRUE) {
        printf("%s: %s\n",oid,CkBinData_getEncoded(bd,"hex_lower"));
    }

    oid = "1.2.250.1.71.4.2.5";
    success = CkCert_GetExtensionBd(cert,oid,bd);
    if (success == TRUE) {
        printf("%s: %s\n",oid,CkBinData_getEncoded(bd,"hex_lower"));
    }

    // Sample output:
    // 1.2.250.1.71.1.2.5: 040180
    // 1.2.250.1.71.1.2.2: 020100
    // 1.2.250.1.71.1.2.3: 1315383032353030303030312f32393030303539313432
    // 1.2.250.1.71.1.2.7: 02010a
    // 1.2.250.1.71.4.2.5: 30060c04534d3236

    // The above binary values are actually ASN.1
    // You can get the ASN.1 decoed by calling GetExtensionAsXml to get it in XML format,
    // and then you extract the values from the XML.

    oid = "1.2.250.1.71.1.2.5";
    strXml = CkCert_getExtensionAsXml(cert,oid);
    if (CkCert_getLastMethodSuccess(cert) == TRUE) {
        printf("%s: %s\n",oid,strXml);
    }

    oid = "1.2.250.1.71.1.2.2";
    strXml = CkCert_getExtensionAsXml(cert,oid);
    if (CkCert_getLastMethodSuccess(cert) == TRUE) {
        printf("%s: %s\n",oid,strXml);
    }

    oid = "1.2.250.1.71.1.2.3";
    strXml = CkCert_getExtensionAsXml(cert,oid);
    if (CkCert_getLastMethodSuccess(cert) == TRUE) {
        printf("%s: %s\n",oid,strXml);
    }

    oid = "1.2.250.1.71.1.2.7";
    strXml = CkCert_getExtensionAsXml(cert,oid);
    if (CkCert_getLastMethodSuccess(cert) == TRUE) {
        printf("%s: %s\n",oid,strXml);
    }

    oid = "1.2.250.1.71.4.2.5";
    strXml = CkCert_getExtensionAsXml(cert,oid);
    if (CkCert_getLastMethodSuccess(cert) == TRUE) {
        printf("%s: %s\n",oid,strXml);
    }

    // Sample output:
    // 1.2.250.1.71.1.2.5: <octets>gA==</octets>
    // 1.2.250.1.71.1.2.2: <int>00</int>
    // 1.2.250.1.71.1.2.3: <printable>8025000001/2900059142</printable>
    // 1.2.250.1.71.1.2.7: <int>0A</int>
    // 1.2.250.1.71.4.2.5: <sequence><utf8>SM26</utf8></sequence>

    // "gA==" is the base64 encoded byte values
    // "0A" is hex for decimal 1


    CkCert_Dispose(cert);
    CkBinData_Dispose(bd);

    }