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(MFC) AES Encrypt and Decrypt a FileMFC demonstrates how to AES encrypt a file of any size, and then decrypt.
#include <CkCrypt2.h> void ChilkatSample(void) { CkString strOut; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkCrypt2 crypt; crypt.put_CryptAlgorithm("aes"); // CipherMode may be "ecb" or "cbc" crypt.put_CipherMode("cbc"); // KeyLength may be 128, 192, 256 crypt.put_KeyLength(256); // The padding scheme determines the contents of the bytes // that are added to pad the result to a multiple of the // encryption algorithm's block size. AES has a block // size of 16 bytes, so encrypted output is always // a multiple of 16. crypt.put_PaddingScheme(0); // An initialization vector is required if using CBC mode. // ECB mode does not use an IV. // The length of the IV is equal to the algorithm's block size. // It is NOT equal to the length of the key. const char *ivHex = "000102030405060708090A0B0C0D0E0F"; crypt.SetEncodedIV(ivHex,"hex"); // The secret key must equal the size of the key. For // 256-bit encryption, the binary secret key is 32 bytes. // For 128-bit encryption, the binary secret key is 16 bytes. const char *keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"; crypt.SetEncodedKey(keyHex,"hex"); // Encrypt a file, producing the .aes as output. // The input file is unchanged, the output .aes contains the encrypted // contents of the input file. // Note: The .aes output file has no file format. It is simply a stream // of bytes that resembles random binary data. const char *inFile = "/Users/chilkat/testData/pdf/sample.pdf"; const char *outFile = "/Users/chilkat/testData/p7m/sample.pdf.aes"; bool success = crypt.CkEncryptFile(inFile,outFile); if (success != true) { strOut.append(crypt.lastErrorText()); strOut.append("\r\n"); SetDlgItemText(IDC_EDIT1,strOut.getUnicode()); return; } // For demonstration purposes, a different instance of the object will be used // for decryption. CkCrypt2 decrypt; // All settings must match to be able to decrypt: decrypt.put_CryptAlgorithm("aes"); decrypt.put_CipherMode("cbc"); decrypt.put_KeyLength(256); decrypt.put_PaddingScheme(0); decrypt.SetEncodedIV(ivHex,"hex"); decrypt.SetEncodedKey(keyHex,"hex"); // Decrypt the .aes inFile = "/Users/chilkat/testData/p7m/sample.pdf.aes"; outFile = "/Users/chilkat/testData/pdf/recovered.pdf"; success = decrypt.CkDecryptFile(inFile,outFile); if (success == false) { strOut.append(decrypt.lastErrorText()); strOut.append("\r\n"); SetDlgItemText(IDC_EDIT1,strOut.getUnicode()); return; } strOut.append("Success!"); strOut.append("\r\n"); SetDlgItemText(IDC_EDIT1,strOut.getUnicode()); } |
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