- * Do not assume it is actually secure until you checked the code... + * It is multi-thread compatible, but beware: + *
+ * Do not assume it is secure; it just here to offer a more-or-less protected + * exchange of data because anonymous and self-signed certificates backed SSL is + * against Google wishes, and I need Android support. * * @author niki */ public class CryptUtils { + static private final String AES_NAME = "AES/CFB128/NoPadding"; + private Cipher ecipher; private Cipher dcipher; + private byte[] bytes32; /** - * 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. @@ -44,22 +63,140 @@ public class CryptUtils { } /** - * Create a new instance of {@link CryptUtils} with the given 128 bytes key. + * Create a new instance of {@link CryptUtils} with the given 128 bits key. *
- * The key must be exactly 128 bytes long. + * The key must be exactly 128 bits long. * * @param bytes32 * the 128 bits (32 bytes) of the key * * @throws InvalidKeyException - * if the key is not an array of 128 bytes + * if the key is not an array of 128 bits */ public CryptUtils(byte[] bytes32) throws InvalidKeyException { init(bytes32); } /** - * This method required an array of 128 bytes. + * Wrap the given {@link InputStream} so it is transparently encrypted by + * the current {@link CryptUtils}. + * + * @param in + * the {@link InputStream} to wrap + * @return the auto-encode {@link InputStream} + */ + 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 + * + * @return the auto-encode {@link InputStream} + * + * @throws IOException + * in case of I/O error + */ + public InputStream encrypt64(InputStream in) throws IOException { + return new Base64InputStream(encrypt(in), true); + } + + /** + * Wrap the given {@link OutputStream} so it is transparently encrypted by + * the current {@link CryptUtils}. + * + * @param out + * the {@link OutputStream} to wrap + * + * @return the auto-encode {@link OutputStream} + */ + public OutputStream encrypt(OutputStream out) { + Cipher ecipher = newCipher(Cipher.ENCRYPT_MODE); + return new CipherOutputStream(out, ecipher); + } + + /** + * 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 + * + * @return the auto-encode {@link OutputStream} + * + * @throws IOException + * in case of I/O error + */ + public OutputStream encrypt64(OutputStream out) throws IOException { + return encrypt(new Base64OutputStream(out, true)); + } + + /** + * 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 decrypt(InputStream in) { + Cipher dcipher = newCipher(Cipher.DECRYPT_MODE); + return new CipherInputStream(in, dcipher); + } + + /** + * 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 + * + * @return the auto-decode {@link InputStream} + * + * @throws IOException + * in case of I/O error + */ + public InputStream decrypt64(InputStream in) throws IOException { + return decrypt(new Base64InputStream(in, false)); + } + + /** + * 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 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 + * + * @return the auto-decode {@link OutputStream} + * + * @throws IOException + * in case of I/O error + */ + public OutputStream decrypt64(OutputStream out) throws IOException { + return new Base64OutputStream(decrypt(out), false); + } + + /** + * This method required an array of 128 bits. * * @param bytes32 * the array, which must be of 128 bits (32 bytes) @@ -75,24 +212,36 @@ public class CryptUtils { + " bytes"); } - SecretKey key = new SecretKeySpec(bytes32, "AES"); + this.bytes32 = bytes32; + this.ecipher = newCipher(Cipher.ENCRYPT_MODE); + this.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); - } catch (NoSuchAlgorithmException e) { - // Every implementation of the Java platform is required to support - // this standard Cipher transformation with 128 bits keys - e.printStackTrace(); - } catch (NoSuchPaddingException e) { - // Every implementation of the Java platform is required to support - // this standard Cipher transformation with 128 bits keys - e.printStackTrace(); - } catch (InvalidKeyException e) { - // Every implementation of the Java platform is required to support - // this standard Cipher transformation with 128 bits keys + // bytes32 = 32 bytes, 32 > 16 + byte[] iv = new byte[16]; + for (int i = 0; i < iv.length; i++) { + iv[i] = bytes32[i]; + } + IvParameterSpec ivspec = new IvParameterSpec(iv); + Cipher cipher = Cipher.getInstance(AES_NAME); + cipher.init(mode, new SecretKeySpec(bytes32, "AES"), ivspec); + return cipher; + } catch (Exception e) { e.printStackTrace(); + throw new RuntimeException( + "Cannot initialize encryption sub-system", e); } } @@ -104,17 +253,19 @@ public class CryptUtils { * * @return the encrypted data * - * @throws IOException + * @throws SSLException * in case of I/O error (i.e., the data is not what you assumed * it was) */ - public byte[] encrypt(byte[] data) throws IOException { - try { - return ecipher.doFinal(data); - } catch (IllegalBlockSizeException e) { - throw new IOException(e); - } catch (BadPaddingException e) { - throw new IOException(e); + public byte[] encrypt(byte[] data) throws SSLException { + synchronized (ecipher) { + try { + return ecipher.doFinal(data); + } catch (IllegalBlockSizeException e) { + throw new SSLException(e); + } catch (BadPaddingException e) { + throw new SSLException(e); + } } } @@ -126,12 +277,12 @@ public class CryptUtils { * * @return the encrypted data * - * @throws IOException + * @throws SSLException * in case of I/O error (i.e., the data is not what you assumed * it was) */ - public byte[] encrypt(String data) throws IOException { - return encrypt(data.getBytes("UTF8")); + public byte[] encrypt(String data) throws SSLException { + return encrypt(StringUtils.getBytes(data)); } /** @@ -146,12 +297,12 @@ public class CryptUtils { * * @return the encrypted data, encoded in Base64 * - * @throws IOException + * @throws SSLException * in case of I/O error (i.e., the data is not what you assumed * it was) */ - public String encrypt64(String data, boolean zip) throws IOException { - return encrypt64(data.getBytes("UTF8"), zip); + public String encrypt64(String data) throws SSLException { + return encrypt64(StringUtils.getBytes(data)); } /** @@ -159,19 +310,21 @@ public class CryptUtils { * * @param data * the data to encrypt - * @param zip - * TRUE to also compress the data in GZIP format; remember that - * compressed and not-compressed content are different; you need - * to know which is which when decoding * * @return the encrypted data, encoded in Base64 * - * @throws IOException + * @throws SSLException * in case of I/O error (i.e., the data is not what you assumed * it was) */ - public String encrypt64(byte[] data, boolean zip) throws IOException { - return StringUtils.base64(encrypt(data), zip); + public String encrypt64(byte[] data) throws SSLException { + try { + return StringUtils.base64(encrypt(data)); + } catch (IOException e) { + // not exactly true, but we consider here that this error is a crypt + // error, not a normal I/O error + throw new SSLException(e); + } } /** @@ -182,16 +335,40 @@ public class CryptUtils { * * @return the original, decoded data * - * @throws IOException + * @throws SSLException * in case of I/O error */ - public byte[] decrypt(byte[] data) throws IOException { + 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 IOException(e); - } catch (BadPaddingException e) { - throw new IOException(e); + return new String(decrypt(data), "UTF-8"); + } catch (UnsupportedEncodingException e) { + // UTF-8 is required in all conform JVMs + e.printStackTrace(); + return null; } } @@ -207,11 +384,17 @@ public class CryptUtils { * * @return the original, decoded data * - * @throws IOException + * @throws SSLException * in case of I/O error */ - public byte[] decrypt64(String data, boolean zip) throws IOException { - return decrypt(StringUtils.unbase64(data, zip)); + public byte[] decrypt64(String data) throws SSLException { + try { + return decrypt(StringUtils.unbase64(data)); + } catch (IOException e) { + // not exactly true, but we consider here that this error is a crypt + // error, not a normal I/O error + throw new SSLException(e); + } } /** @@ -227,11 +410,21 @@ public class CryptUtils { * * @return the original, decoded data * - * @throws IOException + * @throws SSLException * in case of I/O error */ - public String decrypt64s(String data, boolean zip) throws IOException { - return new String(decrypt(StringUtils.unbase64(data, zip)), "UTF-8"); + public String decrypt64s(String data) throws SSLException { + try { + return new String(decrypt(StringUtils.unbase64(data)), "UTF-8"); + } catch (UnsupportedEncodingException e) { + // UTF-8 is required in all conform JVMs + e.printStackTrace(); + return null; + } catch (IOException e) { + // not exactly true, but we consider here that this error is a crypt + // error, not a normal I/O error + throw new SSLException(e); + } } /** @@ -243,6 +436,6 @@ public class CryptUtils { * @return a 128 bits key computed from the given input */ static private byte[] key2key(String input) { - return StringUtils.getMd5Hash(input).getBytes(); + return StringUtils.getMd5Hash("" + input).getBytes(); } }