Encrypt and Decrypt data using same function in C

Question

Is there any function that, for a given non encrypted input, return an encrypted data and for a encrypted input returns the decrypted data?

Somethin like this...

char *text = "This text is being encrypted.";
crypto(text);
//Now "text" is equal to "uhabD143Adev9123CAegawgawash"
crypto(text);
//Now "text" is equal to "This text is being encrypted."

There is no real use for it. Only for demonstration. I won't use it on a real aplication.

The basic XOR encryption does this. There may be more: search for symmetrical encryption code. — Jongware
– Jongware, Commented Mar 5, 2015 at 1:49
Other symmetric encryption algorithms that are widely used are DES, 3DES, and AES. — mti2935
– mti2935, Commented Mar 5, 2015 at 1:51
There are too many functions that do this. A simple XOR encryption as shown by Mux is easy, but insecure. Basically all stream ciphers operate this way including RC4 or AES in CTR mode or a One Time Pad. — Artjom B.
– Artjom B., Commented Mar 7, 2015 at 17:14

Mux · Accepted Answer · 2015-03-05 02:28:28Z

1

If same function can encrypt and decrypt it's not actually encryption :) Anyway xor should work fine:

void crypto(char* text, char key) {
  for (; *text; ++text) *text ^= key;
}

answered Mar 5, 2015 at 2:28

Mux

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