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copied!<p>For those who wish to use String and Base64-encoding for usage with a database you can use these (slightly rewritten) functions from Mike Keskinov (and xalien on Anddev.org).</p> <pre><code>public String encrypt(String str) { try { // Encode the string into bytes using utf-8 byte[] utf8 = str.getBytes("UTF8"); // Encrypt byte[] enc = ecipher.doFinal(utf8); // Encode bytes to base64 to get a string return new String(Base64.encode(enc,0)); } catch (BadPaddingException e) { } catch (IllegalBlockSizeException e) { } catch (UnsupportedEncodingException e) { } return null; } public String decrypt(String str) { try { // Decode base64 to get bytes byte[] dec = Base64.decode(str, 0); // Decrypt byte[] utf8 = dcipher.doFinal(dec); // Decode using utf-8 return new String(utf8, "UTF8"); } catch (BadPaddingException e) { } catch (IllegalBlockSizeException e) { } catch (UnsupportedEncodingException e) { } return null; } </code></pre> <p>This code also uses the built-in Android Base64 libraries, so no need for importing any additional external libraries.</p> <p>Something I didn't realise at first was how to actually use this class from another class (my ignorance). Here's a simple example:</p> <pre><code>StringEncrypter se = new StringEncrypter("mypass"); String decryptedString = se.decrypt(encryptedString); </code></pre> <p>One more thing on Base64. I found out the hard way that Base64 encoding adds a '/n' linefeed character (0x0a) whenever the string gets longer than 76 characters. This severely messes up the decrypt results. To strip out these newline characters you can add something like:</p> <pre><code>b64_enc_str = se.encrypt(plaintext_str); str = b64_enc_str.replace("/n",""); </code></pre> <p>Hopefully it helps someone.</p>

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