--- /dev/null
+package be.nikiroo.utils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.UnsupportedEncodingException;
+import java.security.InvalidKeyException;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.CipherInputStream;
+import javax.crypto.CipherOutputStream;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.SecretKeySpec;
+import javax.net.ssl.SSLException;
+
+import be.nikiroo.utils.streams.Base64InputStream;
+import be.nikiroo.utils.streams.Base64OutputStream;
+
+/**
+ * Small utility class to do AES encryption/decryption.
+ * <p>
+ * It is multi-thread compatible, but beware:
+ * <ul>
+ * <li>The encrypt/decrypt calls are serialized</li>
+ * <li>The streams are independent (and thus parallel)</li>
+ * </ul>
+ * <p>
+ * 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 lazy-easy way to initialize a 128 bits key with
+ * {@link CryptUtils}.
+ * <p>
+ * <b>Some</b> part of the key will be used to generate a 128 bits key and
+ * initialize the {@link CryptUtils}; even NULL will generate something.
+ * <p>
+ * <b>This is most probably not secure. Do not use if you actually care
+ * about security.</b>
+ *
+ * @param key
+ * the {@link String} to use as a base for the key, can be NULL
+ */
+ public CryptUtils(String key) {
+ try {
+ init(key2key(key));
+ } catch (InvalidKeyException e) {
+ // We made sure that the key is correct, so nothing here
+ e.printStackTrace();
+ }
+ }
+
+ /**
+ * Create a new instance of {@link CryptUtils} with the given 128 bits key.
+ * <p>
+ * The key <b>must</b> 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 bits
+ */
+ public CryptUtils(byte[] bytes32) throws InvalidKeyException {
+ init(bytes32);
+ }
+
+ /**
+ * 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 <b>must</b> be of 128 bits (32 bytes)
+ *
+ * @throws InvalidKeyException
+ * if the key is not an array of 128 bits (32 bytes)
+ */
+ private void init(byte[] bytes32) throws InvalidKeyException {
+ if (bytes32 == null || bytes32.length != 32) {
+ throw new InvalidKeyException(
+ "The size of the key must be of 128 bits (32 bytes), it is: "
+ + (bytes32 == null ? "null" : "" + bytes32.length)
+ + " bytes");
+ }
+
+ 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 {
+ // 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);
+ }
+ }
+
+ /**
+ * Encrypt the data.
+ *
+ * @param data
+ * the data to encrypt
+ *
+ * @return the encrypted data
+ *
+ * @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 SSLException {
+ synchronized (ecipher) {
+ try {
+ return ecipher.doFinal(data);
+ } catch (IllegalBlockSizeException e) {
+ throw new SSLException(e);
+ } catch (BadPaddingException e) {
+ throw new SSLException(e);
+ }
+ }
+ }
+
+ /**
+ * Encrypt the data.
+ *
+ * @param data
+ * the data to encrypt
+ *
+ * @return the encrypted data
+ *
+ * @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 SSLException {
+ return encrypt(StringUtils.getBytes(data));
+ }
+
+ /**
+ * Encrypt the data, then encode it into Base64.
+ *
+ * @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 SSLException
+ * in case of I/O error (i.e., the data is not what you assumed
+ * it was)
+ */
+ public String encrypt64(String data) throws SSLException {
+ return encrypt64(StringUtils.getBytes(data));
+ }
+
+ /**
+ * Encrypt the data, then encode it into Base64.
+ *
+ * @param data
+ * the data to encrypt
+ *
+ * @return the encrypted data, encoded in Base64
+ *
+ * @throws SSLException
+ * in case of I/O error (i.e., the data is not what you assumed
+ * it was)
+ */
+ 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);
+ }
+ }
+
+ /**
+ * Decode the data which is assumed to be encrypted with the same utilities.
+ *
+ * @param data
+ * the encrypted data to decode
+ *
+ * @return the original, decoded data
+ *
+ * @throws SSLException
+ * 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 new String(decrypt(data), "UTF-8");
+ } catch (UnsupportedEncodingException e) {
+ // UTF-8 is required in all conform JVMs
+ e.printStackTrace();
+ return null;
+ }
+ }
+
+ /**
+ * Decode the data which is assumed to be encrypted with the same utilities
+ * and is a Base64 encoded value.
+ *
+ * @param data
+ * the encrypted data to decode in Base64 format
+ * @param zip
+ * TRUE to also uncompress the data from a GZIP format
+ * automatically; if set to FALSE, zipped data can be returned
+ *
+ * @return the original, decoded data
+ *
+ * @throws SSLException
+ * in case of I/O error
+ */
+ 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);
+ }
+ }
+
+ /**
+ * Decode the data which is assumed to be encrypted with the same utilities
+ * and is a Base64 encoded value, then convert it into a String (this method
+ * assumes the data <b>was</b> indeed a UTF-8 encoded {@link String}).
+ *
+ * @param data
+ * the encrypted data to decode in Base64 format
+ * @param zip
+ * TRUE to also uncompress the data from a GZIP format
+ * automatically; if set to FALSE, zipped data can be returned
+ *
+ * @return the original, decoded data
+ *
+ * @throws SSLException
+ * in case of I/O error
+ */
+ 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);
+ }
+ }
+
+ /**
+ * This is probably <b>NOT</b> secure!
+ *
+ * @param input
+ * some {@link String} input
+ *
+ * @return a 128 bits key computed from the given input
+ */
+ static private byte[] key2key(String input) {
+ return StringUtils.getMd5Hash("" + input).getBytes();
+ }
+}
git://git.nikiroo.be / fanfix.git / blobdiff