(C) Working with PEM Encrypted Private Keys

Demonstrates how to load and save PEM encrypted private keys.

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#include <C_CkGlobal.h>
#include <C_CkPem.h>
#include <C_CkFileAccess.h>
#include <C_CkPrivateKey.h>

void ChilkatSample(void)
    {
    HCkGlobal chilkatGlob;
    BOOL success;
    HCkPem pem;
    const char *pemPassword;
    HCkFileAccess fac;
    const char *pemText;
    int i;
    int numPrivateKeys;
    HCkPrivateKey privKey;

    // Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
    // by calling UnlockBundle.  It requires a Bundle unlock code.
    chilkatGlob = CkGlobal_Create();
    success = CkGlobal_UnlockBundle(chilkatGlob,"Anything for 30-day trial.");
    if (success != TRUE) {
        printf("%s\n",CkGlobal_lastErrorText(chilkatGlob));
        CkGlobal_Dispose(chilkatGlob);
        return;
    }

    pem = CkPem_Create();

    pemPassword = "secret";

    // To load a PEM file containing encrypted private keys, simply
    // provide the password.
    success = CkPem_LoadPemFile(pem,"/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem",pemPassword);
    if (success != TRUE) {
        printf("%s\n",CkPem_lastErrorText(pem));
        CkGlobal_Dispose(chilkatGlob);
        CkPem_Dispose(pem);
        return;
    }

    fac = CkFileAccess_Create();
    pemText = CkFileAccess_readEntireTextFile(fac,"/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem",pemPassword);

    // To load a PEM from a string, call LoadPem instead of LoadPemFile:
    success = CkPem_LoadPem(pem,pemText);
    if (success != TRUE) {
        printf("%s\n",CkPem_lastErrorText(pem));
        CkGlobal_Dispose(chilkatGlob);
        CkPem_Dispose(pem);
        CkFileAccess_Dispose(fac);
        return;
    }

    // A few notes:
    // The PEM may contain both private keys and certificates (or anything else).
    // The password is utilized for whatever content in the PEM is encrypted.  
    // It is OK to have both encrypted and non-encrypted content within a given PEM.

    // PEM private keys can be encrypted in different formats.  The LoadPem and LoadPemFile
    // methods automatically handle the different formats.
    // One format is PKCS8 and is indicated by this delimiter within the PEM:

    // -----BEGIN ENCRYPTED PRIVATE KEY-----
    // MIICoTAbBgkqhkiG9w0BBQMwDgQIfdD0zv24lgkCAggABIICgE0PdHJmRbNs6cBX
    // ...

    // Another format, we'll call "passphrase" looks like this in the PEM:
    // -----BEGIN RSA PRIVATE KEY-----
    // Proc-Type: 4,ENCRYPTED
    // DEK-Info: DES-EDE3-CBC,A4215544D11C5D0C
    // 
    // paqy9XRexcSjurHfG0xhCaUD0HrvIdhuC0CbRxxxeMlkLaV6+uT80rBxt2AaibWG
    // ...

    // Show the bit length of each private key:

    numPrivateKeys = CkPem_getNumPrivateKeys(pem);
    if (numPrivateKeys == 0) {
        printf("%s\n",("Error: Expected the PEM to contain private keys."));
        CkGlobal_Dispose(chilkatGlob);
        CkPem_Dispose(pem);
        CkFileAccess_Dispose(fac);
        return;
    }

    for (i = 1; i <= numPrivateKeys; i++) {
        privKey = CkPem_GetPrivateKey(pem,i - 1);
        printf("%d: %d bits\n",i,CkPrivateKey_getBitLength(privKey));
        CkPrivateKey_Dispose(privKey);
    }



    CkGlobal_Dispose(chilkatGlob);
    CkPem_Dispose(pem);
    CkFileAccess_Dispose(fac);

    }