></a> functions provide public key encryption and decryption to implement digital &quot;envelopes&quot;.</p>

<p>The <a href="../man3/EVP_DigestSignInit.html"><b>EVP_DigestSign</b><i>XXX</i></a> and <a href="../man3/EVP_DigestVerifyInit.html"><b>EVP_DigestVerify</b><i>XXX</i></a> functions implement digital signatures and Message Authentication Codes (MACs). Also see the older <a href="../man3/EVP_SignInit.html"><b>EVP_Sign</b><i>XXX</i></a> and <a href="../man3/EVP_VerifyInit.html"><b>EVP_Verify</b><i>XXX<