pher (the input is XORed with a pseudo-random key stream to produce the output), decryption uses the same function calls as encryption.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>RC4_set_key() and RC4() do not return values.</p>

<h1 id="NOTE">NOTE</h1>

<p>Applications should use the higher level functions <a href="../man3/EVP_EncryptInit.html">EVP_EncryptInit(3)</a> etc. instead of calling these functions directly.</p>

<p>It is difficult to securely use stream ciphers. For example, do not perform