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(Unicode C++) RSA Encrypt String to Encoded Result and ReverseSee more RSA ExamplesDemonstrates how to RSA encrypt a string to a base64 encoded result, and the reverse.
#include <CkPublicKeyW.h> #include <CkRsaW.h> #include <CkPrivateKeyW.h> void ChilkatSample(void) { // The RSA public key is used for encryption, and the private key for decryption. // The public key's role is to make encryption accessible to anyone while ensuring that // only the private key holder can decrypt the messages. // The public key is designed to be widely distributed so anyone can use it to encrypt messages // intended for the owner of the private key. // Load our 2048-bit RSA public key. CkPublicKeyW pubKey; // In all Chilkat methods expecting a path, you pass either absolute or relative paths. bool success = pubKey.LoadFromFile(L"rsaKeys/myTestRsaPublic.pem"); if (success == false) { wprintf(L"%s\n",pubKey.lastErrorText()); return; } CkRsaW rsa; // Tell RSA to use the public key. rsa.ImportPublicKeyObj(pubKey); // RSA encryption is for small amounts of data, on the order of 200 bytes or less. // The maximum number of bytes that can be RSA encrypted depends // on the RSA key size and padding scheme (OAEP padding vs PKCS#1 v1.5 padding). // For specific limits, see: RSA Encryption Maximum Number of Bytes // Encrypt the utf-8 byte representation of the string. rsa.put_Charset(L"utf-8"); rsa.put_EncodingMode(L"base64"); // Be Careful when Using non-us-ascii String Literals in Source Code const wchar_t *encryptedB64 = rsa.encryptStringENC(L"Élève français dîne à côté d’un café où l’on sert déjà du gâteau au chocolat et des éclairs délicieux",false); // ------------------------------------------------------------------------------------------------------------------------ // Let's decrypt, which requires the matching private key... // Load the matching 2048-bit RSA private key. CkPrivateKeyW privKey; const wchar_t *password = L"secret"; success = privKey.LoadAnyFormatFile(L"rsaKeys/myTestRsaPrivate.pem",password); if (success == false) { wprintf(L"%s\n",privKey.lastErrorText()); return; } // Tell the RSA object to use the private key. rsa.ImportPrivateKeyObj(privKey); // Indicate that after decrypting the resultant decrypted bytes contains the utf-8 byte representation of the text. rsa.put_Charset(L"utf-8"); rsa.put_EncodingMode(L"base64"); const wchar_t *originalText = rsa.decryptStringENC(encryptedB64,true); if (success == false) { wprintf(L"%s\n",rsa.lastErrorText()); return; } wprintf(L"Original text = %s\n",originalText); wprintf(L"Success.\n"); } |
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