(C) PBKDF2 Key Derivation

Demonstrates AES secret key derivation from a password using PBDKF2.

For more information, see https://www.chilkatsoft.com/key_derivation_pbkdf2.asp

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#include <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    const char *password;
    const char *charset;
    const char *hashAlg;
    const char *saltHex;
    int iterationCount;
    int outputBitLen;
    const char *enc;
    const char *hexKey;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    crypt = CkCrypt2_Create();

    password = "correcthorsebatterystaple";

    // Derive from the utf-8 byte representation of the password.
    charset = "utf-8";

    hashAlg = "sha256";

    CkCrypt2_putEncodingMode(crypt,"hex");
    saltHex = CkCrypt2_genRandomBytesENC(crypt,16);

    iterationCount = 310000;

    // Derive a 256-bit key from the password.
    outputBitLen = 256;

    // The derived key is returned as a hex or base64 encoded string.
    // (Note: The salt argument must be a string that also uses
    // the same encoding.)
    enc = "hex";

    hexKey = CkCrypt2_pbkdf2(crypt,password,charset,hashAlg,saltHex,iterationCount,outputBitLen,enc);

    printf("%s\n",hexKey);

    // Sample output:
    // 597734C894FF89CFD3B93D925462C24E97724BCB118F6FC919007F5ABC27E768


    CkCrypt2_Dispose(crypt);

    }