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(C++) About RSA Public/Private KeysThis example provides some additional information for understanding public/private key pairs. In demonstrates how a private key is a superset of the public key. A public key contains the modulus and exponent. The matching private key also contains the modulus and exponent, but also contains the additional private key parts. Note: This example requires Chilkat v11.0.0 or greater.
#include <CkCert.h> #include <CkPublicKey.h> #include <CkPrivateKey.h> void ChilkatSample(void) { bool success = false; CkCert cert; // Load a digital certificate. success = cert.LoadFromFile("digitalCert.cer"); if (success == false) { std::cout << cert.lastErrorText() << "\r\n"; return; } // A .cer file does not contain the private key. It should contain // the public key... CkPublicKey pubKey; cert.GetPublicKey(pubKey); // Let's have a look at it (in XML format). std::cout << "Public Key from Certificate:" << "\r\n"; std::cout << pubKey.getXml() << "\r\n"; // An RSA public key consists of a modulus and exponent. // An RSA private key includes both the modulus and exponent, // as well as other "big" numbers: P, Q, D, etc. // Let's load an RSA private key from a DER-encoded file: CkPrivateKey privKey; success = privKey.LoadAnyFormatFile("PrivateKey.key",""); if (success != true) { std::cout << privKey.lastErrorText() << "\r\n"; return; } // If this private key is the matching half to the public key from // the certificate, then the modulus and exponent should // be identical. (Thus, a "private key" really contains both the public part as well as the private parts...). std::cout << "Private Key from DER:" << "\r\n"; std::cout << privKey.getXml() << "\r\n"; } |
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