Java内容重新整理删除过期的东西

Java/JavaDemo/codedemo/encrypt/EncryptAndDecrypt.java

@@ -0,0 +1,125 @@
+package cn.aofeng.demo.encrypt;
+
+import java.io.UnsupportedEncodingException;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.SecretKeySpec;
+
+/**
+ * 加密与解密。
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+public class EncryptAndDecrypt {
+
+    public final static String CHARSET = "utf8";
+
+    /**
+     * 创建安全密钥。
+     * 
+     * @param encryptType
+     *            加密方式，如：AES，Blowfish。详情查看<a href="https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#Cipher">Java Cryptography Architecture Standard Algorithm Name Documentation</a>
+     * @param keyStr
+     *            密钥明文
+     * @return 安全密钥
+     * @throws UnsupportedEncodingException
+     *             不支持指定的字符集编码
+     */
+    public SecretKey createSecretKey(String encryptType, String keyStr)
+            throws UnsupportedEncodingException {
+        byte[] secretKeyData = keyStr.getBytes(CHARSET);
+        SecretKeySpec sks = new SecretKeySpec(secretKeyData, encryptType);
+
+        return sks;
+    }
+
+    /**
+     * 加密数据。
+     * 
+     * @param encryptType 加密方式，如：AES，Blowfish。详情查看<a href="https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#Cipher">Java Cryptography Architecture Standard Algorithm Name Documentation</a>
+     * @param secretKey 密钥
+     * @param srcData 待加密的源数据
+     * @return 加密后的二进制数据（字节数组）
+     * @see #encrypt(String, SecretKey, String, String)
+     */
+    public byte[] encrypt(String encryptType, SecretKey secretKey,
+            String srcData) throws InvalidKeyException,
+            IllegalBlockSizeException, BadPaddingException,
+            UnsupportedEncodingException, NoSuchAlgorithmException,
+            NoSuchPaddingException, InvalidAlgorithmParameterException {
+        return encrypt(encryptType, secretKey, srcData, null);
+    }
+
+    /**
+     * 加密数据。
+     * 
+     * @param encryptType 加密类型，如：AES/CBC/PKCS5Padding
+     * @param secretKey 密钥
+     * @param srcData 待加密的源数据
+     * @param algorithmParam 某些加密算法的附加参数
+     * @return 加密后的二进制数据（字节数组）
+     */
+    public byte[] encrypt(String encryptType, SecretKey secretKey,
+            String srcData, String algorithmParam) throws InvalidKeyException,
+            IllegalBlockSizeException, BadPaddingException,
+            UnsupportedEncodingException, NoSuchAlgorithmException,
+            NoSuchPaddingException, InvalidAlgorithmParameterException {
+        Cipher encrpyt = Cipher.getInstance(encryptType);
+        if (null == algorithmParam) {
+            encrpyt.init(Cipher.ENCRYPT_MODE, secretKey);
+        } else {
+            IvParameterSpec iv = new IvParameterSpec(
+                    algorithmParam.getBytes(CHARSET));
+            encrpyt.init(Cipher.ENCRYPT_MODE, secretKey, iv);
+        }
+        byte[] secretData = encrpyt.doFinal(srcData.getBytes(CHARSET));
+
+        return secretData;
+    }
+
+    /**
+     * 解密数据。
+     * 
+     * @param decryptType 解密方式，如：AES，Blowfish。详情查看<a href="https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#Cipher">Java Cryptography Architecture Standard Algorithm Name Documentation</a>
+     * @param secretKey 密钥
+     * @param secretData 待解密的数据
+     * @return 解密后的数据
+     * @see #decrypt(String, SecretKey, byte[], String)
+     */
+    public String decrypt(String decryptType, SecretKey secretKey,
+            byte[] secretData) throws InvalidKeyException,
+            IllegalBlockSizeException, BadPaddingException,
+            UnsupportedEncodingException, NoSuchAlgorithmException,
+            NoSuchPaddingException, InvalidAlgorithmParameterException {
+        return decrypt(decryptType, secretKey, secretData, null);
+    }
+
+    public String decrypt(String decryptType, SecretKey secretKey,
+            byte[] secretData, String algorithmParam)
+            throws InvalidKeyException, IllegalBlockSizeException,
+            BadPaddingException, UnsupportedEncodingException,
+            NoSuchAlgorithmException, NoSuchPaddingException,
+            InvalidAlgorithmParameterException {
+        Cipher decrypt = Cipher.getInstance(decryptType);
+        if (null == algorithmParam) {
+            decrypt.init(Cipher.DECRYPT_MODE, secretKey);
+        } else {
+            IvParameterSpec iv = new IvParameterSpec(
+                    algorithmParam.getBytes(CHARSET));
+            decrypt.init(Cipher.DECRYPT_MODE, secretKey, iv);
+        }
+        byte[] srcData = decrypt.doFinal(secretData);
+        String srcStr = new String(srcData, CHARSET);
+
+        return srcStr;
+    }
+
+}