+++ /dev/null
-/*
- * Copyright (C) 2007-2012 Argeo GmbH
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.argeo.security.crypto;
-
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.security.GeneralSecurityException;
-import java.security.InvalidKeyException;
-import java.security.Key;
-import java.security.Security;
-
-import javax.crypto.Cipher;
-import javax.crypto.CipherInputStream;
-import javax.crypto.CipherOutputStream;
-import javax.crypto.SecretKey;
-import javax.crypto.SecretKeyFactory;
-import javax.crypto.spec.IvParameterSpec;
-import javax.crypto.spec.PBEKeySpec;
-import javax.crypto.spec.SecretKeySpec;
-
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.argeo.ArgeoException;
-import org.argeo.StreamUtils;
-import org.bouncycastle.jce.provider.BouncyCastleProvider;
-
-/** Simple password based encryption / decryption */
-public class PasswordBasedEncryption {
- private final static Log log = LogFactory
- .getLog(PasswordBasedEncryption.class);
-
- static {
- Security.addProvider(new BouncyCastleProvider());
- }
-
- public final static Integer DEFAULT_ITERATION_COUNT = 1024;
- /** Stronger with 256, but causes problem with Oracle JVM */
- public final static Integer DEFAULT_SECRETE_KEY_LENGTH = 256;
- public final static Integer DEFAULT_SECRETE_KEY_LENGTH_RESTRICTED = 128;
- public final static String DEFAULT_SECRETE_KEY_FACTORY = "PBKDF2WithHmacSHA1";
- public final static String DEFAULT_SECRETE_KEY_ENCRYPTION = "AES";
- public final static String DEFAULT_CIPHER_NAME = "AES/CBC/PKCS5Padding";
- public final static String DEFAULT_CHARSET = "UTF-8";
-
- private Integer iterationCount = DEFAULT_ITERATION_COUNT;
- private Integer secreteKeyLength = DEFAULT_SECRETE_KEY_LENGTH;
- private String secreteKeyFactoryName = DEFAULT_SECRETE_KEY_FACTORY;
- private String secreteKeyEncryption = DEFAULT_SECRETE_KEY_ENCRYPTION;
- private String cipherName = DEFAULT_CIPHER_NAME;
-
- private static byte[] DEFAULT_SALT_8 = { (byte) 0xA9, (byte) 0x9B,
- (byte) 0xC8, (byte) 0x32, (byte) 0x56, (byte) 0x35, (byte) 0xE3,
- (byte) 0x03 };
- private static byte[] DEFAULT_IV_16 = { (byte) 0xA9, (byte) 0x9B,
- (byte) 0xC8, (byte) 0x32, (byte) 0x56, (byte) 0x35, (byte) 0xE3,
- (byte) 0x03, (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32,
- (byte) 0x56, (byte) 0x35, (byte) 0xE3, (byte) 0x03 };
-
- private Key key;
- private Cipher ecipher;
- private Cipher dcipher;
-
- /**
- * Default provider is bouncy castle, in order to have consistent behaviour
- * across implementations
- */
- private String securityProviderName = "BC";
-
- /**
- * This is up to the caller to clear the passed array. Neither copy of nor
- * reference to the passed array is kept
- */
- public PasswordBasedEncryption(char[] password) {
- this(password, DEFAULT_SALT_8, DEFAULT_IV_16);
- }
-
- /**
- * This is up to the caller to clear the passed array. Neither copies of nor
- * references to the passed arrays are kept
- */
- public PasswordBasedEncryption(char[] password, byte[] passwordSalt,
- byte[] initializationVector) {
- try {
- initKeyAndCiphers(password, passwordSalt, initializationVector);
- } catch (InvalidKeyException e) {
- Integer previousSecreteKeyLength = secreteKeyLength;
- secreteKeyLength = DEFAULT_SECRETE_KEY_LENGTH_RESTRICTED;
- log.warn("'" + e.getMessage() + "', will use " + secreteKeyLength
- + " secrete key length instead of "
- + previousSecreteKeyLength);
- try {
- initKeyAndCiphers(password, passwordSalt, initializationVector);
- } catch (Exception e1) {
- throw new ArgeoException(
- "Cannot get secret key (with restricted length)", e1);
- }
- } catch (Exception e) {
- throw new ArgeoException("Cannot get secret key", e);
- }
- }
-
- protected void initKeyAndCiphers(char[] password, byte[] passwordSalt,
- byte[] initializationVector) throws GeneralSecurityException {
- byte[] salt = new byte[8];
- System.arraycopy(passwordSalt, 0, salt, 0, salt.length);
- // for (int i = 0; i < password.length && i < salt.length; i++)
- // salt[i] = (byte) password[i];
- byte[] iv = new byte[16];
- System.arraycopy(initializationVector, 0, iv, 0, iv.length);
-
- SecretKeyFactory keyFac = SecretKeyFactory
- .getInstance(getSecretKeyFactoryName());
- PBEKeySpec keySpec = new PBEKeySpec(password, salt,
- getIterationCount(), getKeyLength());
- String secKeyEncryption = getSecretKeyEncryption();
- if (secKeyEncryption != null) {
- SecretKey tmp = keyFac.generateSecret(keySpec);
- key = new SecretKeySpec(tmp.getEncoded(), getSecretKeyEncryption());
- } else {
- key = keyFac.generateSecret(keySpec);
- }
- ecipher = Cipher.getInstance(getCipherName(), securityProviderName);
- ecipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
- dcipher = Cipher.getInstance(getCipherName());
- dcipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
- }
-
- public void encrypt(InputStream decryptedIn, OutputStream encryptedOut)
- throws IOException {
- try {
- CipherOutputStream out = new CipherOutputStream(encryptedOut,
- ecipher);
- StreamUtils.copy(decryptedIn, out);
- StreamUtils.closeQuietly(out);
- } catch (IOException e) {
- throw e;
- } catch (Exception e) {
- throw new ArgeoException("Cannot encrypt", e);
- } finally {
- StreamUtils.closeQuietly(decryptedIn);
- }
- }
-
- public void decrypt(InputStream encryptedIn, OutputStream decryptedOut)
- throws IOException {
- try {
- CipherInputStream decryptedIn = new CipherInputStream(encryptedIn,
- dcipher);
- StreamUtils.copy(decryptedIn, decryptedOut);
- } catch (IOException e) {
- throw e;
- } catch (Exception e) {
- throw new ArgeoException("Cannot decrypt", e);
- } finally {
- StreamUtils.closeQuietly(encryptedIn);
- }
- }
-
- public byte[] encryptString(String str) {
- ByteArrayOutputStream out = null;
- ByteArrayInputStream in = null;
- try {
- out = new ByteArrayOutputStream();
- in = new ByteArrayInputStream(str.getBytes(DEFAULT_CHARSET));
- encrypt(in, out);
- return out.toByteArray();
- } catch (Exception e) {
- throw new ArgeoException("Cannot encrypt", e);
- } finally {
- StreamUtils.closeQuietly(out);
- }
- }
-
- /** Closes the input stream */
- public String decryptAsString(InputStream in) {
- ByteArrayOutputStream out = null;
- try {
- out = new ByteArrayOutputStream();
- decrypt(in, out);
- return new String(out.toByteArray(), DEFAULT_CHARSET);
- } catch (Exception e) {
- throw new ArgeoException("Cannot decrypt", e);
- } finally {
- StreamUtils.closeQuietly(out);
- }
- }
-
- protected Key getKey() {
- return key;
- }
-
- protected Cipher getEcipher() {
- return ecipher;
- }
-
- protected Cipher getDcipher() {
- return dcipher;
- }
-
- protected Integer getIterationCount() {
- return iterationCount;
- }
-
- protected Integer getKeyLength() {
- return secreteKeyLength;
- }
-
- protected String getSecretKeyFactoryName() {
- return secreteKeyFactoryName;
- }
-
- protected String getSecretKeyEncryption() {
- return secreteKeyEncryption;
- }
-
- protected String getCipherName() {
- return cipherName;
- }
-
- public void setIterationCount(Integer iterationCount) {
- this.iterationCount = iterationCount;
- }
-
- public void setSecreteKeyLength(Integer keyLength) {
- this.secreteKeyLength = keyLength;
- }
-
- public void setSecreteKeyFactoryName(String secreteKeyFactoryName) {
- this.secreteKeyFactoryName = secreteKeyFactoryName;
- }
-
- public void setSecreteKeyEncryption(String secreteKeyEncryption) {
- this.secreteKeyEncryption = secreteKeyEncryption;
- }
-
- public void setCipherName(String cipherName) {
- this.cipherName = cipherName;
- }
-
- public void setSecurityProviderName(String securityProviderName) {
- this.securityProviderName = securityProviderName;
- }
-}
projects / lgpl / argeo-commons.git / blobdiff