208 lines
8.9 KiB
HTML
208 lines
8.9 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>SJCL demo</title>
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<link rel="stylesheet" type="text/css" href="example.css"/>
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<script type="text/javascript" src="../sjcl.js"></script>
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<script type="text/javascript" src="form.js"></script>
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<script type="text/javascript" src="example.js"></script>
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</head>
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<body onload="loaded()">
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<h1>SJCL demo</h1>
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<div class="header">
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<p>This page is a demo of the Stanford Javascript Crypto Library. To get started, just type in a password in the left pane and a secret message in the middle pane, then click "encrypt". Encryption takes place in your browser and we never see the plaintext.</p>
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<p>SJCL has lots of other options, many of which are shown in the grey boxes.</p>
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</div>
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<form id="theForm" onsubmit="return false;">
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<div class="column" id="ckey">
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<!-- Password and pbkdf2 parameters -->
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<div class="box" id="ppassword">
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<h2>Password</h2>
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<div class="section">
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<label for="password">Password:</label>
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<input type="password" class="wide" name="password" id="password" autocomplete="off" tabindex="1"/>
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<p class="explanation">
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Choose a strong, random password.
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</p>
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</div>
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</div>
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<div class="box" id="pkey">
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<h2>Key Derivation</h2>
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<div class="section">
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<div>
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<label for="salt"">Salt:</label>
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<a class="random floatright" href="javascript:randomize('salt',2,0)">random</a>
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</div>
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<input type="text" id="salt" class="wide hex" autocomplete="off" size="17" maxlength="35"/>
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<input type="checkbox" name="freshsalt" id="freshsalt" autocomplete="off" checked="checked"/>
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<label for="freshsalt">Use fresh random salt for each new password</label>
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<p class="explanation">
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Salt adds more variability to your key, and prevents attackers
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from using <a href="http://en.wikipedia.org/wiki/Rainbow_table">rainbow tables</a> to attack it.
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</p>
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</div>
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<div class="section">
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<label for="iter">Strengthen by a factor of:</label>
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<input type="text" name="iter" id="iter" value="1000" class="numeric" size="5" maxlength="5" autocomplete="off"/>
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<p class="explanation">
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Strengthening makes it slower to compute the key corresponding to your
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password. This makes it take much longer for an attacker to guess it.
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</p>
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</div>
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<div class="section">
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Key size:
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<input type="radio" name="keysize" value="128" id="key128" checked="checked" autocomplete="off" onclick="extendKey(4)"/>
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<label for="key128">128</label>
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<input type="radio" name="keysize" value="192" id="key192" autocomplete="off" onclick="extendKey(6)"/>
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<label for="key192">192</label>
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<input type="radio" name="keysize" value="256" id="key256" autocomplete="off" onclick="extendKey(8)"/>
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<label for="key256">256</label>
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<p class="explanation">
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128 bits should be secure enough, but you can generate a longer
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key if you wish.
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</p>
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</div>
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<!-- cipher key -->
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<div class="section">
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<div>
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<label for="key">Key:</label>
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<!--
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<a class="random floatright" href="javascript:randomizeKey()">random</a>
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-->
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</div>
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<textarea id="key" name="key" class="hex" rows="2" autocomplete="off"></textarea>
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<p class="explanation">
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This key is computed from your password, salt and strengthening factor. It
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will be used internally by the cipher. Instead of using a password, you can
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enter a key here directly. If you do, it should be 32, 48 or 64 hexadecimal
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digits (128, 192 or 256 bits).
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</p>
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</div>
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</div>
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</div>
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<!-- mode controls -->
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<div class="column" id="cmode">
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<div class="box">
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<h2>Cipher Parameters</h2>
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<p class="explanation">
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SJCL encrypts your data with the <a href="http://en.wikipedia.org/wiki/Advanced_Encryption_Standard"><acronym title="Advanced Encryption Standard">AES</acronym></a> block cipher.
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</p>
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<div class="section">
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Cipher mode:
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<input type="radio" name="mode" value="ccm" id="ccm" checked="checked" autocomplete="off"/>
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<label for="ccm"><acronym title="Counter mode with Cipher block chaining Message authentication code">CCM</acronym></label>
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<input type="radio" name="mode" value="ocb2" id="ocb2" autocomplete="off"/>
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<label for="ocb2"><acronym title="Offset CodeBook mode, version 2.0">OCB2</acronym></label>
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<p class="explanation">
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The cipher mode is a standard for how to use AES and other
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algorithms to encrypt and authenticate your message.
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<a href="http://en.wikipedia.org/wiki/OCB_mode">OCB2 mode</a>
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is slightly faster and has more features, but
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<a href="http://en.wikipedia.org/wiki/CCM_mode">CCM mode</a> has wider
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support because it is not patented.
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</p>
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</div>
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<div class="section">
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<div>
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<label for="iv">Initialization vector:</label>
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<a class="random floatright" href="javascript:randomize('iv',4,0)">random</a>
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</div>
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<input type="text" name="iv" id="iv" class="wide hex" size="32" maxlength="35" autocomplete="off"/>
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<input type="checkbox" id="freshiv" autocomplete="off" checked="checked"/>
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<label for="freshiv">Choose a new random IV for every message.</label>
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<p class="explanation">
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The IV needs to be different for every message you send. It adds
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randomness to your message, so that the same message will look
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different each time you send it.
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</p>
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<p class="explanation">
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Be careful: CCM mode doesn't use
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the whole IV, so changing just part of it isn't enough.
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</p>
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</div>
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<div class="section">
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Authentication strength:
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<input type="radio" name="tag" value="64" id="tag64" autocomplete="off" checked="checked"/>
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<label for="tag64">64</label>
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<input type="radio" name="tag" value="96" id="tag96" autocomplete="off"/>
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<label for="tag96">96</label>
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<input type="radio" name="tag" value="128" id="tag128" autocomplete="off"/>
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<label for="tag128">128</label>
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<p class="explanation">
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SJCL adds a an authentication tag to your message to make sure
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nobody changes it. The longer the authentication tag, the harder it is
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for somebody to change your encrypted message without you noticing. 64
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bits is probably enough.
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</p>
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</div>
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<div class="section">
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<input type="checkbox" name="json" id="json" autocomplete="off" checked="checked"/>
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<label for="json">Send the parameters and authenticated data along
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with the message.</label>
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<p class="explanation">
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These parameters are required to decrypt your message later. If the
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person you're sending the message to knows them, you don't need to send
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them so your message will be shorter.
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</p>
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<p class="explanation">
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Default parameters won't be sent. Your password won't be sent, either.
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The salt and iv will be encoded in base64 instead of hex, so they'll
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look different from what's in the box.
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</p>
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</div>
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</div>
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</div>
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<div class="column" id="ctexts">
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<div id="pplaintext" class="box">
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<h2>Plaintext</h2>
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<div class="section">
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<label for="plaintext">Secret message:</label>
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<textarea id="plaintext" autocomplete="off" rows="5" tabindex="2"></textarea>
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<div class="explanation">
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This message will be encrypted, so that nobody can read it or change it
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without your password.
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</div>
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</div>
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<div class="section">
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<label for="adata">Authenticated data:</label>
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<textarea id="adata" autocomplete="off" tabindex="3"></textarea>
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<div class="explanation">
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This auxilliary message isn't secret, but its integrity will be checked
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along with the integrity of the message.
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</div>
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</div>
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</div>
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<div id="buttons">
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<a href="javascript:doEncrypt()" id="encrypt" tabindex="4"><span class="turnDown">encrypt</span></a>
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<a href="javascript:doDecrypt()" id="decrypt" tabindex="6"><span class="turnUp">decrypt</span></a>
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</div>
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<div id="pciphertext" class="box">
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<h2>Ciphertext</h2>
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<label for="ciphertext">Ciphertext:</label>
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<textarea id="ciphertext" autocomplete="off" rows="7" tabindex="5"></textarea>
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<div class="explanation">
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Your message, encrypted and authenticated so that nobody can read it
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or change it without your password.
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</div>
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</div>
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</form>
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</body>
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</html>
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