Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You can convert the <code>SecretKey</code> to a byte array (<code>byte[]</code>), then Base64 encode that to a <code>String</code>. To convert back to a <code>SecretKey</code>, Base64 decode the String and use it in a <code>SecretKeySpec</code> to rebuild your original <code>SecretKey</code>.</p> <h2>For Java 8</h2> <p><strong>SecretKey to String:</strong></p> <pre><code>// create new key SecretKey secretKey = KeyGenerator.getInstance("AES").generateKey(); // get base64 encoded version of the key String encodedKey = Base64.getEncoder().encodeToString(secretKey.getEncoded()); </code></pre> <p><strong>String to SecretKey:</strong></p> <pre><code>// decode the base64 encoded string byte[] decodedKey = Base64.getDecoder().decode(encodedKey); // rebuild key using SecretKeySpec SecretKey originalKey = new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES"); </code></pre> <hr> <h2>For Java 7 and before (including Android):</h2> <p><strong>NOTE I:</strong> you can skip the Base64 encoding/decoding part and just store the <code>byte[]</code> in SQLite. That said, performing Base64 encoding/decoding is not an expensive operation and you can store strings in almost any DB without issues.</p> <p><strong>NOTE II:</strong> Earlier Java versions do not include a Base64 in one of the <code>java.lang</code> or <code>java.util</code> packages. It is however possible to use codecs from <a href="http://commons.apache.org/proper/commons-codec/" rel="noreferrer">Apache Commons Codec</a>, <a href="https://www.bouncycastle.org/java.html" rel="noreferrer">Bouncy Castle</a> or <a href="https://github.com/google/guava" rel="noreferrer">Guava</a>.</p> <p><strong>SecretKey to String:</strong></p> <pre><code>// CREATE NEW KEY // GET ENCODED VERSION OF KEY (THIS CAN BE STORED IN A DB) SecretKey secretKey; String stringKey; try {secretKey = KeyGenerator.getInstance("AES").generateKey();} catch (NoSuchAlgorithmException e) {/* LOG YOUR EXCEPTION */} if (secretKey != null) {stringKey = Base64.encodeToString(secretKey.getEncoded(), Base64.DEFAULT)} </code></pre> <p><strong>String to SecretKey:</strong></p> <pre><code>// DECODE YOUR BASE64 STRING // REBUILD KEY USING SecretKeySpec byte[] encodedKey = Base64.decode(stringKey, Base64.DEFAULT); SecretKey originalKey = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES"); </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POConverting Secret Key into a String and Vice Versa
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USJabari
    1. USJabari
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POConverting Secret Key into a String and Vice Versa
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CO@luis - Then why, exactly, do language text books have code examples? Programming is a hands on sport. Under your thinking, authors/teachers should only use paragraphs to explain programming and call it a day. I suppose fireman should learn how to do their job with paragraphs only, and athletes learn speed & agility via text.
      singulars
      1. PO
      1. USJabari
    2. CO@luis Yet, StackOverflow has special tags for the sole purpose of posting code examples. It makes learning easier. Not really sure what part of that you can't understand, it's hardly rocket science. Explanation Alone = Partial Answer. Explanation + Solid Code Example = Complete Answer. It's why mine currently has 18 votes and yours has 1, even though they are both technically correct.
      singulars
      1. PO
      1. USJabari
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload