(C) Create XML Signature using Java KeyStore (.jks)

Demonstrates how to create an XML digital signature using a certificate and private key from a Java KeyStore (.jks)

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <C_CkXml.h>
#include <C_CkJavaKeyStore.h>
#include <C_CkCertChain.h>
#include <C_CkCert.h>
#include <C_CkXmlDSigGen.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    HCkXml xml;
    HCkJavaKeyStore jks;
    const char *password;
    BOOL success;
    HCkCertChain chain;
    HCkCert cert;
    HCkXmlDSigGen gen;
    BOOL bUsePrivateKey;
    HCkStringBuilder sbXml;

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

    // The SOAP XML to be signed in this example contains the following:

    // <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
    // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    //     <SOAP-ENV:Header>
    //         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"></wsse:Security>
    //     </SOAP-ENV:Header>
    //     <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
    //         <z:FooBar xmlns:z="http://example.com" />
    //     </SOAP-ENV:Body>
    // </SOAP-ENV:Envelope>
    // 

    // Build the XML to sign.
    // Use this online tool to generate the code from sample XML: 
    // Generate Code to Create XML

    xml = CkXml_Create();
    CkXml_putTag(xml,"SOAP-ENV:Envelope");
    CkXml_AddAttribute(xml,"xmlns:SOAP-ENV","http://schemas.xmlsoap.org/soap/envelope/");
    CkXml_UpdateAttrAt(xml,"SOAP-ENV:Header|wsse:Security",TRUE,"xmlns:wsse","http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd");
    CkXml_UpdateAttrAt(xml,"SOAP-ENV:Header|wsse:Security",TRUE,"SOAP-ENV:mustUnderstand","1");
    CkXml_UpdateAttrAt(xml,"SOAP-ENV:Body",TRUE,"xmlns:SOAP-SEC","http://schemas.xmlsoap.org/soap/security/2000-12");
    CkXml_UpdateAttrAt(xml,"SOAP-ENV:Body",TRUE,"SOAP-SEC:id","Body");
    CkXml_UpdateAttrAt(xml,"SOAP-ENV:Body|z:FooBar",TRUE,"xmlns:z","http://example.com");

    // Load a JavaKeyStore file containing the certificate + private key.
    jks = CkJavaKeyStore_Create();
    password = "secret";
    success = CkJavaKeyStore_LoadFile(jks,password,"qa_data/jks/test_secret.jks");
    if (success != TRUE) {
        printf("%s\n",CkJavaKeyStore_lastErrorText(jks));
        CkXml_Dispose(xml);
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    // Make sure we have a private key.
    if (CkJavaKeyStore_getNumPrivateKeys(jks) < 1) {
        printf("No private key available.\n");
        CkXml_Dispose(xml);
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    // -------------------------------------------------------------------------
    // Get the certificate chain associated with the 1st (and probably only) private key in the JKS.
    chain = CkJavaKeyStore_GetCertChain(jks,0);
    if (CkJavaKeyStore_getLastMethodSuccess(jks) != TRUE) {
        printf("%s\n",CkJavaKeyStore_lastErrorText(jks));
        CkXml_Dispose(xml);
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    cert = CkCertChain_GetCert(chain,0);
    if (CkCertChain_getLastMethodSuccess(chain) != TRUE) {
        printf("%s\n",CkCertChain_lastErrorText(chain));
        CkCertChain_Dispose(chain);
        CkXml_Dispose(xml);
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    CkCertChain_Dispose(chain);

    // Verify again that this cert has a private key.
    if (CkCert_HasPrivateKey(cert) != TRUE) {
        printf("Certificate has no associated private key.\n");
        CkCert_Dispose(cert);
        CkXml_Dispose(xml);
        CkJavaKeyStore_Dispose(jks);
        return;
    }

    // Prepare for signing...
    // Use this online tool to generate the following code from an already-signed XML sample: 
    // Generate Code to Create an XML Signature
    gen = CkXmlDSigGen_Create();

    // Indicate where the Signature will be inserted.
    CkXmlDSigGen_putSigLocation(gen,"SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security");

    // Add a reference to the fragment of the XML to be signed.
    CkXmlDSigGen_AddSameDocRef(gen,"Body","sha1","EXCL_C14N","","");

    // (You can read about the SignedInfoPrefixList in the online reference documentation.  It's optional..)
    CkXmlDSigGen_putSignedInfoPrefixList(gen,"wsse SOAP-ENV");

    // Provide the private key for signing via the certificate, and indicate that
    // we want the base64 of the certificate embedded in the KeyInfo.
    CkXmlDSigGen_putKeyInfoType(gen,"X509Data");
    CkXmlDSigGen_putX509Type(gen,"Certificate");

    // Note: Because our certificate was loaded from a JKS which also contained the private key,
    // Chilkat automatically knows and has the private key associated with the certificate.
    // We set bUsePrivateKey to tell the SetX509Cert method to automatically use the private key
    // associated with the certificate for signing.
    bUsePrivateKey = TRUE;
    success = CkXmlDSigGen_SetX509Cert(gen,cert,bUsePrivateKey);
    if (success != TRUE) {
        printf("%s\n",CkXmlDSigGen_lastErrorText(gen));
        CkCert_Dispose(cert);
        CkXml_Dispose(xml);
        CkJavaKeyStore_Dispose(jks);
        CkXmlDSigGen_Dispose(gen);
        return;
    }

    CkCert_Dispose(cert);

    // Everything's specified.  Now create and insert the Signature
    sbXml = CkStringBuilder_Create();
    CkXml_GetXmlSb(xml,sbXml);
    success = CkXmlDSigGen_CreateXmlDSigSb(gen,sbXml);
    if (success != TRUE) {
        printf("%s\n",CkXmlDSigGen_lastErrorText(gen));
        CkXml_Dispose(xml);
        CkJavaKeyStore_Dispose(jks);
        CkXmlDSigGen_Dispose(gen);
        CkStringBuilder_Dispose(sbXml);
        return;
    }

    // Examine the XML with the digital signature inserted
    printf("%s\n",CkStringBuilder_getAsString(sbXml));


    CkXml_Dispose(xml);
    CkJavaKeyStore_Dispose(jks);
    CkXmlDSigGen_Dispose(gen);
    CkStringBuilder_Dispose(sbXml);

    }