+ * For the moment, it is multi-thread compatible, but beware: + *
* Do not assume it is actually secure until you checked the code... * * @author niki */ public class CryptUtils { + static private final String AES_NAME = "AES/CFB8/NoPadding"; + private Cipher ecipher; private Cipher dcipher; + private SecretKey key; /** - * Small and leazy way to initialize a 128 bits key with {@link CryptUtils}. + * Small and lazy-easy way to initialize a 128 bits key with + * {@link CryptUtils}. *
* Some part of the key will be used to generate a 128 bits key and * initialize the {@link CryptUtils}; even NULL will generate something. @@ -72,46 +84,136 @@ public class CryptUtils { * the {@link InputStream} to wrap * @return the auto-encode {@link InputStream} */ - public InputStream encryptInputStream(InputStream in) { + public InputStream encrypt(InputStream in) { + Cipher ecipher = newCipher(Cipher.ENCRYPT_MODE); return new CipherInputStream(in, ecipher); } + /** + * Wrap the given {@link InputStream} so it is transparently encrypted by + * the current {@link CryptUtils} and encoded in base64. + * + * @param in + * the {@link InputStream} to wrap + * @param zip + * TRUE to also uncompress the data from a GZIP format; take care + * about this flag, as it could easily cause errors in the + * returned content or an {@link IOException} + * + * @return the auto-encode {@link InputStream} + * + * @throws IOException + * in case of I/O error + */ + public InputStream encrypt64(InputStream in, boolean zip) + throws IOException { + return StringUtils.base64(encrypt(in), zip, false); + } + /** * Wrap the given {@link OutputStream} so it is transparently encrypted by * the current {@link CryptUtils}. * - * @param in + * @param out * the {@link OutputStream} to wrap + * * @return the auto-encode {@link OutputStream} */ - public OutputStream encryptOutpuStream(OutputStream out) { + public OutputStream encrypt(OutputStream out) { + Cipher ecipher = newCipher(Cipher.ENCRYPT_MODE); return new CipherOutputStream(out, ecipher); } /** - * Wrap the given {@link OutStream} so it is transparently decoded by the + * Wrap the given {@link OutputStream} so it is transparently encrypted by + * the current {@link CryptUtils} and encoded in base64. + * + * @param out + * the {@link OutputStream} to wrap + * @param zip + * TRUE to also uncompress the data from a GZIP format; take care + * about this flag, as it could easily cause errors in the + * returned content or an {@link IOException} + * + * @return the auto-encode {@link OutputStream} + * + * @throws IOException + * in case of I/O error + */ + public OutputStream encrypt64(OutputStream out, boolean zip) + throws IOException { + return encrypt(StringUtils.base64(out, zip, false)); + } + + /** + * Wrap the given {@link OutputStream} so it is transparently decoded by the * current {@link CryptUtils}. * * @param in * the {@link InputStream} to wrap + * * @return the auto-decode {@link InputStream} */ - public InputStream decryptInputStream(InputStream in) { + public InputStream decrypt(InputStream in) { + Cipher dcipher = newCipher(Cipher.DECRYPT_MODE); return new CipherInputStream(in, dcipher); } /** - * Wrap the given {@link OutStream} so it is transparently decoded by the + * Wrap the given {@link OutputStream} so it is transparently decoded by the + * current {@link CryptUtils} and decoded from base64. + * + * @param in + * the {@link InputStream} to wrap + * @param zip + * TRUE to also uncompress the data from a GZIP format; take care + * about this flag, as it could easily cause errors in the + * returned content or an {@link IOException} + * + * @return the auto-decode {@link InputStream} + * + * @throws IOException + * in case of I/O error + */ + public InputStream decrypt64(InputStream in, boolean zip) + throws IOException { + return decrypt(StringUtils.unbase64(in, zip)); + } + + /** + * Wrap the given {@link OutputStream} so it is transparently decoded by the * current {@link CryptUtils}. * * @param out * the {@link OutputStream} to wrap * @return the auto-decode {@link OutputStream} */ - public OutputStream decryptOutputStream(OutputStream out) { + public OutputStream decrypt(OutputStream out) { + Cipher dcipher = newCipher(Cipher.DECRYPT_MODE); return new CipherOutputStream(out, dcipher); } + /** + * Wrap the given {@link OutputStream} so it is transparently decoded by the + * current {@link CryptUtils} and decoded from base64. + * + * @param out + * the {@link OutputStream} to wrap + * @param zip + * TRUE to also uncompress the data from a GZIP format; take care + * about this flag, as it could easily cause errors in the + * returned content or an {@link IOException} + * + * @return the auto-decode {@link OutputStream} + * + * @throws IOException + * in case of I/O error + */ + public OutputStream decrypt64(OutputStream out, boolean zip) + throws IOException { + return StringUtils.unbase64(decrypt(out), zip); + } + /** * This method required an array of 128 bytes. * @@ -129,12 +231,28 @@ public class CryptUtils { + " bytes"); } - SecretKey key = new SecretKeySpec(bytes32, "AES"); + key = new SecretKeySpec(bytes32, "AES"); + ecipher = newCipher(Cipher.ENCRYPT_MODE); + dcipher = newCipher(Cipher.DECRYPT_MODE); + } + + /** + * Create a new {@link Cipher}of the given mode (see + * {@link Cipher#ENCRYPT_MODE} and {@link Cipher#ENCRYPT_MODE}). + * + * @param mode + * the mode ({@link Cipher#ENCRYPT_MODE} or + * {@link Cipher#ENCRYPT_MODE}) + * + * @return the new {@link Cipher} + */ + private Cipher newCipher(int mode) { try { - ecipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); - dcipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); - ecipher.init(Cipher.ENCRYPT_MODE, key); - dcipher.init(Cipher.DECRYPT_MODE, key); + byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; + IvParameterSpec ivspec = new IvParameterSpec(iv); + Cipher cipher = Cipher.getInstance(AES_NAME); + cipher.init(mode, key, ivspec); + return cipher; } catch (NoSuchAlgorithmException e) { // Every implementation of the Java platform is required to support // this standard Cipher transformation with 128 bits keys @@ -147,7 +265,12 @@ public class CryptUtils { // Every implementation of the Java platform is required to support // this standard Cipher transformation with 128 bits keys e.printStackTrace(); + } catch (InvalidAlgorithmParameterException e) { + // Woops? + e.printStackTrace(); } + + return null; } /** @@ -163,12 +286,14 @@ public class CryptUtils { * it was) */ public byte[] encrypt(byte[] data) throws SSLException { - try { - return ecipher.doFinal(data); - } catch (IllegalBlockSizeException e) { - throw new SSLException(e); - } catch (BadPaddingException e) { - throw new SSLException(e); + synchronized (ecipher) { + try { + return ecipher.doFinal(data); + } catch (IllegalBlockSizeException e) { + throw new SSLException(e); + } catch (BadPaddingException e) { + throw new SSLException(e); + } } } @@ -258,12 +383,36 @@ public class CryptUtils { * in case of I/O error */ public byte[] decrypt(byte[] data) throws SSLException { + synchronized (dcipher) { + try { + return dcipher.doFinal(data); + } catch (IllegalBlockSizeException e) { + throw new SSLException(e); + } catch (BadPaddingException e) { + throw new SSLException(e); + } + } + } + + /** + * Decode the data which is assumed to be encrypted with the same utilities + * and to be a {@link String}. + * + * @param data + * the encrypted data to decode + * + * @return the original, decoded data,as a {@link String} + * + * @throws SSLException + * in case of I/O error + */ + public String decrypts(byte[] data) throws SSLException { try { - return dcipher.doFinal(data); - } catch (IllegalBlockSizeException e) { - throw new SSLException(e); - } catch (BadPaddingException e) { - throw new SSLException(e); + return new String(decrypt(data), "UTF-8"); + } catch (UnsupportedEncodingException e) { + // UTF-8 is required in all confirm JVMs + e.printStackTrace(); + return null; } }