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(Unicode C) RSA Encrypt and Decrypt StringsUnicode C sample code to RSA public-key encrypt and decrypt strings using public and private keys.
#include <C_CkRsaW.h> void ChilkatSample(void) { HCkRsaW rsa; BOOL success; const wchar_t *publicKey; const wchar_t *privateKey; const wchar_t *plainText; HCkRsaW rsaEncryptor; BOOL usePrivateKey; const wchar_t *encryptedStr; HCkRsaW rsaDecryptor; const wchar_t *decryptedStr; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rsa = CkRsaW_Create(); // This example also generates the public and private // keys to be used in the RSA encryption. // Normally, you would generate a key pair once, // and distribute the public key to your partner. // Anything encrypted with the public key can be // decrypted with the private key. The reverse is // also true: anything encrypted using the private // key can be decrypted using the public key. // Generate a 1024-bit key. Chilkat RSA supports // key sizes ranging from 512 bits to 4096 bits. success = CkRsaW_GenerateKey(rsa,1024); if (success != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkRsaW_Dispose(rsa); return; } // Keys are exported in XML format: publicKey = CkRsaW_exportPublicKey(rsa); privateKey = CkRsaW_exportPrivateKey(rsa); plainText = L"Encrypting and decrypting should be easy!"; // Start with a new RSA object to demonstrate that all we // need are the keys previously exported: rsaEncryptor = CkRsaW_Create(); // Encrypted output is always binary. In this case, we want // to encode the encrypted bytes in a printable string. // Our choices are "hex", "base64", "url", "quoted-printable". CkRsaW_putEncodingMode(rsaEncryptor,L"hex"); // We'll encrypt with the public key and decrypt with the private // key. It's also possible to do the reverse. success = CkRsaW_ImportPublicKey(rsaEncryptor,publicKey); usePrivateKey = FALSE; encryptedStr = CkRsaW_encryptStringENC(rsaEncryptor,plainText,usePrivateKey); wprintf(L"%s\n",encryptedStr); // Now decrypt: rsaDecryptor = CkRsaW_Create(); CkRsaW_putEncodingMode(rsaDecryptor,L"hex"); success = CkRsaW_ImportPrivateKey(rsaDecryptor,privateKey); usePrivateKey = TRUE; decryptedStr = CkRsaW_decryptStringENC(rsaDecryptor,encryptedStr,usePrivateKey); wprintf(L"%s\n",decryptedStr); CkRsaW_Dispose(rsa); CkRsaW_Dispose(rsaEncryptor); CkRsaW_Dispose(rsaDecryptor); } |
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