(C++) AES Encryption

See more Encryption Examples

AES encryption. The Chilkat encryption component supports 128-bit, 192-bit, and 256-bit AES encryption in ECB (Electronic Cookbook), CBC (Cipher-Block Chaining), and other modes.

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#include <CkCrypt2.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2 crypt;

    // AES is also known as Rijndael.		
    crypt.put_CryptAlgorithm("aes");

    // CipherMode may be "ecb", "cbc", "ofb", "cfb", "gcm", etc.
    // Note: Check the online reference documentation to see the Chilkat versions
    // when certain cipher modes were introduced.
    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);

    // EncodingMode specifies the encoding of the output for
    // encryption, and the input for decryption.
    // It may be "hex", "url", "base64", or "quoted-printable".
    crypt.put_EncodingMode("hex");

    // 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 string...
    // The input string is 44 ANSI characters (i.e. 44 bytes), so
    // the output should be 48 bytes (a multiple of 16).
    // Because the output is a hex string, it should
    // be 96 characters long (2 chars per byte).
    const char *encStr = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.");
    std::cout << encStr << "\r\n";

    // This is the encrypted output in hex format:
    // 4846F83AA211E239AA62A21F527F089EE9DDBEAD30EE15D4E79B607A621B97BEDB9B6F00A9B21F1B43A50B4C1BE0EDF2

    // Now decrypt:
    const char *decStr = crypt.decryptStringENC(encStr);
    std::cout << decStr << "\r\n";

    // This is the decrypted string:
    // The quick brown fox jumps over the lazy dog.
    }