encrypt.php

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 <?php

 $plaintext = "message to be encrypted";

 $cipher = "aes-128-ocb";

 $key = random_bytes(32);

 

     $ivlen = openssl_cipher_iv_length($cipher);

 print($ivlen."\n");

 print(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES."\n");

 

     $iv = random_bytes($ivlen);

     $ciphertext = openssl_encrypt($plaintext, $cipher, $key, $options=0, $iv, $tag);

 print(strlen($plaintext)."\n");

 print(strlen($ciphertext)."\n");

 

     //store $cipher, $iv, and $tag for decryption later


 

     $original_plaintext = openssl_decrypt($ciphertext, $cipher, $key, $options=0, $iv, $tag);

 

     echo $original_plaintext."\n";

 

 $other_plaintext = sodium_crypto_secretbox_open( $ciphertext, $iv, $key);

 

 echo $original_plaintext."\n";