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(Unicode C++) RSA Sign with PKCS8 Encrypted KeyDemonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature (and then verify it). 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 PEM file: success = privKey.LoadAnyFormatFile(L"raul_privateKey.key",L"a0123456789"); 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; } // This example will sign a string, and receive the signature // in a hex-encoded string. Therefore, set the encoding mode // to "hex": 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 sha1, sha384, sha512 and others. const wchar_t *hexSig = rsa.signStringENC(strData,L"sha256"); if (rsa.get_LastMethodSuccess() == false) { wprintf(L"%s\n",rsa.lastErrorText()); return; } wprintf(L"%s\n",hexSig); // Now verify with the public key. // This example shows how to use the public key from // a digital certificate (.cer file) CkCertW cert; success = cert.LoadFromFile(L"raul_publicKey.cer"); if (success == false) { wprintf(L"%s\n",cert.lastErrorText()); return; } CkPublicKeyW pubKey; cert.GetPublicKey(pubKey); CkRsaW rsa2; success = rsa2.UsePublicKey(pubKey); if (success == false) { wprintf(L"%s\n",rsa2.lastErrorText()); return; } // Verify the signature against the original data: rsa2.put_EncodingMode(L"hex"); success = rsa2.VerifyStringENC(strData,L"sha256",hexSig); if (success == false) { wprintf(L"%s\n",rsa2.lastErrorText()); return; } wprintf(L"Signature verified!\n"); // Verify with incorrect data: success = rsa2.VerifyStringENC(L"something else",L"sha256",hexSig); if (success != true) { wprintf(L"Signature not verified! (which was expected in this case)\n"); } else { wprintf(L"Hmmm... that's not right...\n"); } } |
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