Chilkat Examples

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(C) Generate new DSA Key from OpenSSL Parameters File

Generates a new DSA key from an OpenSSL-created parameters file (DER and PEM formats supported). Examples of using OpenSSL to create parameter files are shown here:

openssl dsaparam -outform DER 1024 <  seedData.txt >dsaparam.der

openssl dsaparam 1024 < seedData.txt >dsaparam.pem

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#include <C_CkDsa.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkDsa dsa;
    const char *pemStr;
    const char *xmlStr;
    BOOL bPublicOnly;



    dsa = CkDsa_Create();

    success = CkDsa_UnlockComponent(dsa,"Anything for 30-day trial");
    if (success != TRUE) {
        printf("%s\n",CkDsa_lastErrorText(dsa));
        CkDsa_Dispose(dsa);
        return;
    }

    success = CkDsa_GenKeyFromParamsDerFile(dsa,"dsaparam.der");
    if (success != TRUE) {
        printf("%s\n",CkDsa_lastErrorText(dsa));
        CkDsa_Dispose(dsa);
        return;
    }

    //  To generate a key from PEM, call GenKeyFromParamsPem
    //  (for an in-memory PEM string) or GenKeyFromParamsFilePem
    //  for a PEM file.

    //  The public and private keys may now be exported to PEM, DER,
    //  and XML formatted files.

    //  First for the public key...
    //  The public key never needs to be encrypted.

    //  Save the public key in PEM format:
    pemStr = CkDsa_toPublicPem(dsa);
    //  This example will not check the return value of SaveText...
    success = CkDsa_SaveText(dsa,pemStr,"dsa_pub.pem");

    //  Save the public key in DER format:
    success = CkDsa_ToPublicDerFile(dsa,"dsa_pub.der");

    bPublicOnly = TRUE;
    //  Save to XML
    xmlStr = CkDsa_toXml(dsa,bPublicOnly);
    success = CkDsa_SaveText(dsa,pemStr,"dsa_pub.xml");

    //  ------------------------------------
    //  Now for the private key....
    //  ------------------------------------

    //  Unencrypted PEM:
    pemStr = CkDsa_toPem(dsa);
    success = CkDsa_SaveText(dsa,pemStr,"dsa_priv.pem");

    //  Encrypted PEM:
    pemStr = CkDsa_toEncryptedPem(dsa,"myPassword");
    success = CkDsa_SaveText(dsa,pemStr,"dsa_privEncrypted.pem");

    //  DER:
    success = CkDsa_ToDerFile(dsa,"dsa_priv.der");

    //  XML:
    bPublicOnly = FALSE;
    xmlStr = CkDsa_toXml(dsa,bPublicOnly);
    success = CkDsa_SaveText(dsa,pemStr,"dsa_priv.xml");

    printf("Finished!\n");


    CkDsa_Dispose(dsa);

    }

 

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