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(Unicode C++) Convert RSA Private Key to Public KeyDemonstrates how to get a public RSA key from a private RSA key.
#include <CkPrivateKeyW.h> #include <CkPublicKeyW.h> void ChilkatSample(void) { CkPrivateKeyW key; // Step 1: Load the private key from a source. // (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings. // see the online reference documentation for more options.) bool success = key.LoadPemFile(L"qa_data/pem/VP_Private.pem"); if (success != true) { wprintf(L"%s\n",key.lastErrorText()); return; } // Step 2: Get the public key object from the private key object. CkPublicKeyW *pubKey = key.GetPublicKey(); if (key.get_LastMethodSuccess() != true) { wprintf(L"%s\n",key.lastErrorText()); return; } // Step 3: Save the public key in a desired format. // (Chilkat can load or save public and private keys in many different formats. See // the online reference documentation for more options.) // Saves to a PKCS8 PEM file. bool bPreferPkcs1 = false; success = pubKey->SavePemFile(bPreferPkcs1,L"qa_data/pem/VP_Public.pem"); if (pubKey->get_LastMethodSuccess() != true) { wprintf(L"%s\n",pubKey->lastErrorText()); return; } delete pubKey; wprintf(L"Extracted and saved public key from private key.\n"); } |
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