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(Unicode C++) RSA Signature/Verify with .key and .cerSee more RSA ExamplesDemonstrates how to use a .key file (private key) and digital certificate (.cer, public key) to create and verify an RSA signature.Note: This example requires Chilkat v11.0.0 or greater.
#include <CkPrivateKeyW.h> #include <CkRsaW.h> #include <CkCertW.h> #include <CkPublicKeyW.h> void ChilkatSample(void) { bool success = false; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkPrivateKeyW privKey; // Load the private key from an RSA .key file: success = privKey.LoadPemFile(L"privateKey.key"); if (success == false) { wprintf(L"%s\n",privKey.lastErrorText()); return; } CkRsaW rsa; // Import the private key into the RSA component: success = rsa.UsePrivateKey(privKey); if (success == false) { wprintf(L"%s\n",rsa.lastErrorText()); return; } // Create the signature as a hex string: rsa.put_EncodingMode(L"hex"); const wchar_t *strData = L"This is the string to be signed."; // Sign the string using the sha256 hash algorithm. // Other valid choices are "md2", "sha1", "sha384", // "sha512", and "md5". const wchar_t *hexSig = rsa.signStringENC(strData,L"sha256"); wprintf(L"%s\n",hexSig); // Load a digital certificate from a .cer file: CkCertW cert; success = cert.LoadFromFile(L"myCert.cer"); if (success == false) { wprintf(L"%s\n",cert.lastErrorText()); return; } CkPublicKeyW pubKey; cert.GetPublicKey(pubKey); // Now verify using a new instance of the RSA object: CkRsaW rsa2; // Import the public key into the RSA object: success = rsa2.UsePublicKey(pubKey); if (success == false) { wprintf(L"%s\n",rsa2.lastErrorText()); return; } // The signature is a hex string, so make sure the EncodingMode is correct: rsa2.put_EncodingMode(L"hex"); // Verify the signature: success = rsa2.VerifyStringENC(strData,L"sha256",hexSig); if (success == false) { wprintf(L"%s\n",rsa2.lastErrorText()); return; } wprintf(L"Success.\n"); } |
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