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(Unicode C) Example for both AES-128 and ChaCha20 to Encrypt Binary DataDemonstrates the use of the new EncryptBd and DecryptBd methods introduced in Chilkat v9.5.0.67 to encrypt/decrypt binary bytes. Note: This example requires Chilkat v9.5.0.67 or greater.
#include <C_CkBinDataW.h> #include <C_CkCrypt2W.h> void ChilkatSample(void) { HCkBinDataW jpgBytes; BOOL success; HCkCrypt2W crypt; const wchar_t *ivHex; const wchar_t *keyHex; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Load a small JPG file to be encrypted/decrypted. jpgBytes = CkBinDataW_Create(); success = CkBinDataW_LoadFile(jpgBytes,L"qa_data/jpg/starfish.jpg"); if (success != TRUE) { wprintf(L"Failed to load JPG file.\n"); CkBinDataW_Dispose(jpgBytes); return; } // Show the unencrypted JPG bytes in Base64 format. // (The "base64_mime" encoding was added in Chilkat v9.5.0.67. // The "base64" encoding emits a single line of base64, whereas // "base64_mime" will emit multi-line base64 as it would appear // in MIME.) wprintf(L"%s\n",CkBinDataW_getEncoded(jpgBytes,L"base64_mime")); // Sample base64_mime JPG data: // /9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA // AQBIAAAAAQABOEJJTQPzAAAAAAAIAAAAAAAAAAE4QklNBAoAAAAAAAEAADhCSU0nEAAAAAAACgAB // AAAAAAAAAAI4QklNA/UAAAAAAEgAL2ZmAAEAbGZmAAYAAAAAAAEAL2ZmAAEAoZmaAAYAAAAAAAEA // MgAAAAEAWgAAAAYAAAAAAAEANQAAAAEALQAAAAYAAAAAAAE4QklNBBQAAAAAAAQAAAABOEJJTQQM // ... crypt = CkCrypt2W_Create(); // Specify the encryption to be used. // First we'll do AES-128 CBC CkCrypt2W_putCryptAlgorithm(crypt,L"aes"); CkCrypt2W_putCipherMode(crypt,L"cbc"); CkCrypt2W_putKeyLength(crypt,128); ivHex = L"000102030405060708090A0B0C0D0E0F"; CkCrypt2W_SetEncodedIV(crypt,ivHex,L"hex"); keyHex = L"000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"; CkCrypt2W_SetEncodedKey(crypt,keyHex,L"hex"); // Do the in-place 128-bit AES CBC encryption. // The contents of jpgBytes are replaced with the encrypted bytes. success = CkCrypt2W_EncryptBd(crypt,jpgBytes); if (success != TRUE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkBinDataW_Dispose(jpgBytes); CkCrypt2W_Dispose(crypt); return; } // Examine the JPG bytes again. The bytes should be different because they are encrypted: wprintf(L"%s\n",CkBinDataW_getEncoded(jpgBytes,L"base64_mime")); // Sample base64_mime encrypted JPG data: // sbz0babt1WCkQf5xKMdg/baZAcUBO5GVUUDF2BjVqmd+HrqKN+t6hAcqakL/bdo0q9hYmow0Tp1e // AQ9V9DOiifQUZqWVkR+kL/c45bq8JGFDvgNl0djPt+yYhV789IB/fPH0upx+/ad++WNOlv1IxGMr // Y1x1oERU/IsiEzafUJdI4kZ6FQo2IPGMF/Rm1h79I7hP1yYUFxvJyz+PzaySAUH1nLsNHyDVY5VY // O90aH3steRSYbz8C8UF9wQ3qqEIXQNnnixvoNDnmHyY39VoVBI5F6rnPwYDfAk2t8tmuryFqvwAu // ... // Decrypt to restore back to the original: success = CkCrypt2W_DecryptBd(crypt,jpgBytes); if (success != TRUE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkBinDataW_Dispose(jpgBytes); CkCrypt2W_Dispose(crypt); return; } wprintf(L"%s\n",CkBinDataW_getEncoded(jpgBytes,L"base64_mime")); // /9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA // AQBIAAAAAQABOEJJTQPzAAAAAAAIAAAAAAAAAAE4QklNBAoAAAAAAAEAADhCSU0nEAAAAAAACgAB // AAAAAAAAAAI4QklNA/UAAAAAAEgAL2ZmAAEAbGZmAAYAAAAAAAEAL2ZmAAEAoZmaAAYAAAAAAAEA // MgAAAAEAWgAAAAYAAAAAAAEANQAAAAEALQAAAAYAAAAAAAE4QklNBBQAAAAAAAQAAAABOEJJTQQM // ... // ---------------------------------------------------------------------------------- // To do chacha20 encryption, just change the settings: CkCrypt2W_putCryptAlgorithm(crypt,L"chacha20"); CkCrypt2W_putKeyLength(crypt,256); // The initial count is the initial block counter for the chacha20 algorithm. // It can be any integer, but must be set to the same when decrypting. CkCrypt2W_putInitialCount(crypt,22); success = CkCrypt2W_EncryptBd(crypt,jpgBytes); // jpgBytes now contains chacha20 encrypted bytes. success = CkCrypt2W_DecryptBd(crypt,jpgBytes); // jpgBytes is now restored back to the original unencrypted by bytes. // Save the bytes to a file.. success = CkBinDataW_WriteFile(jpgBytes,L"qa_output/starfish.jpg"); wprintf(L"Success.\n"); CkBinDataW_Dispose(jpgBytes); CkCrypt2W_Dispose(crypt); } |
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