+++ /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