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(C) RSA Encrypt and Decrypt Credit Card NumbersC sample code to RSA public-key encrypt and decrypt credit card numbers. The RSA key is loaded from an unencrypted PKCS8 file. Chilkat provides many ways of setting the key -- loading from both encrypted and unencrypted PEM, PKCS8, DER, PVK, etc. Keys may be loaded from files or in-memory representations. (The RSA component also provides the ability to generate RSA keys.) Note: This example requires Chilkat v11.0.0 or greater.
#include <C_CkRsa.h> #include <C_CkPrivateKey.h> #include <C_CkPublicKey.h> void ChilkatSample(void) { BOOL success; HCkRsa rsa; HCkPrivateKey privKey; HCkPublicKey pubKey; const char *ccNumber; BOOL usePrivateKey; const char *encryptedStr; HCkRsa rsaDecryptor; const char *decryptedStr; success = FALSE; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rsa = CkRsa_Create(); privKey = CkPrivateKey_Create(); // Load an RSA private key from a file: success = CkPrivateKey_LoadAnyFormatFile(privKey,"rsaPrivateKey.key",""); if (success == FALSE) { printf("%s\n",CkPrivateKey_lastErrorText(privKey)); CkRsa_Dispose(rsa); CkPrivateKey_Dispose(privKey); return; } // Get the public part of the private key. pubKey = CkPublicKey_Create(); CkPrivateKey_ToPublicKey(privKey,pubKey); success = CkRsa_UsePublicKey(rsa,pubKey); if (success == FALSE) { printf("%s\n",CkRsa_lastErrorText(rsa)); CkRsa_Dispose(rsa); CkPrivateKey_Dispose(privKey); CkPublicKey_Dispose(pubKey); return; } // Encrypt a VISA credit card number: // 1234-5678-0000-9999 ccNumber = "1234567800009999"; usePrivateKey = FALSE; CkRsa_putEncodingMode(rsa,"base64"); encryptedStr = CkRsa_encryptStringENC(rsa,ccNumber,usePrivateKey); printf("Encrypted:\n"); printf("%s\n",encryptedStr); // Now decrypt: rsaDecryptor = CkRsa_Create(); CkRsa_putEncodingMode(rsaDecryptor,"base64"); CkRsa_UsePrivateKey(rsaDecryptor,privKey); usePrivateKey = TRUE; decryptedStr = CkRsa_decryptStringENC(rsaDecryptor,encryptedStr,usePrivateKey); printf("Decrypted:\n"); printf("%s\n",decryptedStr); // Important: RSA encryption should only be used to encrypt small amounts of data. // It is typically used for encrypting symmetric encryption // keys such that a symmetric encryption algorithm, such as // AES is then used to encrypt/decrypt bulk data CkRsa_Dispose(rsa); CkPrivateKey_Dispose(privKey); CkPublicKey_Dispose(pubKey); CkRsa_Dispose(rsaDecryptor); } |
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