Password based encryption

[lgpl/argeo-commons.git] / basic / runtime / org.argeo.basic.nodeps / src / main / java / org / argeo / util / crypto / PasswordBasedEncryption.java

diff --git a/basic/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/util/crypto/PasswordBasedEncryption.java b/basic/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/util/crypto/PasswordBasedEncryption.java
new file mode 100644 (file)
index 0000000..b1c18eb
--- /dev/null
+++ b/basic/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/util/crypto/PasswordBasedEncryption.java
@@ -0,0 +1,169 @@
+package org.argeo.util.crypto;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.security.Key;
+
+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.argeo.ArgeoException;
+import org.argeo.StreamUtils;
+
+/** Simple password based encryption / decryption */
+public class PasswordBasedEncryption {
+       public final static Integer DEFAULT_ITERATION_COUNT = 1024;
+       public final static Integer DEFAULT_KEY_LENGTH = 256;
+       public final static String DEFAULT_SECRETE_KEY_FACTORY = "PBKDF2WithHmacSHA1";
+       public final static String DEFAULT_SECRETE_KEY_ENCRYPTION = "AES";
+       public final static String DEFAULT_CIPHER = "AES/CBC/PKCS5Padding";
+       public final static String DEFAULT_CHARSET = "UTF-8";
+
+       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 final Key key;
+       private final Cipher ecipher;
+       private final Cipher dcipher;
+
+       public PasswordBasedEncryption(char[] password) {
+               try {
+                       byte[] salt = new byte[8];
+                       System.arraycopy(DEFAULT_SALT_8, 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(DEFAULT_IV_16, 0, iv, 0, iv.length);
+                       for (int i = 0; i < password.length && i < iv.length; i++)
+                               iv[i] = (byte) password[i];
+
+                       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());
+                       ecipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
+                       // AlgorithmParameters params = ecipher.getParameters();
+                       // byte[] iv =
+                       // params.getParameterSpec(IvParameterSpec.class).getIV();
+                       dcipher = Cipher.getInstance(getCipherName());
+                       dcipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
+               } catch (Exception e) {
+                       throw new ArgeoException("Cannot get secret key", e);
+               }
+       }
+
+       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 DEFAULT_ITERATION_COUNT;
+       }
+
+       protected Integer getKeyLength() {
+               return DEFAULT_KEY_LENGTH;
+       }
+
+       protected String getSecretKeyFactoryName() {
+               return DEFAULT_SECRETE_KEY_FACTORY;
+       }
+
+       protected String getSecretKeyEncryption() {
+               return DEFAULT_SECRETE_KEY_ENCRYPTION;
+       }
+
+       protected String getCipherName() {
+               return DEFAULT_CIPHER;
+       }
+}