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<?php $algo = 'aes-256-gcm'; $iv = random_bytes(openssl_cipher_iv_length($algo)); echo(openssl_cipher_iv_length($algo)); echo("\n"); $key = random_bytes(32); // 256 bit //$data = random_bytes(1024); // 1 Kb of random data $data = "well hello there with insane length and soooooooooooooooooooooooooooooooooooooooo much data in it. Bigger better stronger D:"; $ciphertext = openssl_encrypt( $data, $algo, $key, OPENSSL_RAW_DATA, $iv, $tag ); // Change 1 bit in ciphertext // $i = rand(0, mb_strlen($ciphertext, '8bit') - 1); // $ciphertext[$i] = $ciphertext[$i] ^ chr(1); echo(base64_encode($ciphertext)); echo("\n"); echo(base64_encode($tag)); $i = rand(0, mb_strlen($tag, '8bit') - 1); //$tag[$i] = $tag[$i] ^ chr(1); echo("\n"); echo(base64_encode($tag)); $decrypt = openssl_decrypt( $ciphertext, $algo, $key, OPENSSL_RAW_DATA, $iv, $tag ); if (false === $decrypt) { throw new Exception(sprintf( "OpenSSL error: %s", openssl_error_string() )); } printf ("Decryption %s\n", $data === $decrypt ? 'Ok' : 'Failed');
Output for 7.1.7
12 QhYJwW74b77ZnILEDcS8aIGVxT0ARRJ+cWgbg9h3QSWvf3fr63BuebcpSBGAG1SUTPc2pO9TvnmLvSvZ8S15FrN4PLjGgzjXGAK2xtjSta6cInfqNJVlHflNBWYK6HQVRoW6OU2Sj60lKe8DIMsH2raGkoT6uwkc84FbjA== RtjHG1xSe8h6u0OjqXuh9A== RtjHG1xSe8h6u0OjqXuh9A==Decryption Ok