C++

AES CFB Mode Encryption

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Demonstrates how to encrypt using AES CFB (Cipher Feedback) mode. C++

#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;

    crypt.put_CryptAlgorithm("aes");
    crypt.put_CipherMode("cfb");
    crypt.put_KeyLength(256);

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

    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.
    const char *keyHex = "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4";
    crypt.SetEncodedKey(keyHex,"hex");

    // Encrypt a string...
    const char *encStr = crypt.encryptStringENC("Good night, good night! parting is such sweet sorrow, That I shall say good night till it be morrow. --  William Shakespeare");
    std::cout << encStr << "\r\n";

    CkCrypt2 decrypt;

    decrypt.put_CryptAlgorithm("aes");
    decrypt.put_CipherMode("cfb");
    decrypt.put_KeyLength(256);
    decrypt.put_EncodingMode("hex");
    decrypt.SetEncodedIV(ivHex,"hex");
    decrypt.SetEncodedKey(keyHex,"hex");

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