DESUtil.java
import org.apache.tomcat.util.codec.binary.Base64; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.security.Key; import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import java.security.spec.AlgorithmParameterSpec; import javax.crypto.Cipher; import javax.crypto.CipherInputStream; import javax.crypto.CipherOutputStream; import javax.crypto.KeyGenerator; import javax.crypto.spec.IvParameterSpec; public class DESUtil { /** * CFB */ public static final String CFB = "CFB"; /** * OFB */ public static final String OFB = "OFB"; /** * CBC */ public static final String CBC = "CBC"; /** * iv向量 */ private static final byte[] DESIV = { (byte) 0xCE, (byte) 0x35, (byte) 0x5, (byte) 0xD, (byte) 0x98, (byte) 0x91, (byte) 0x8, (byte) 0xA }; /** * AlgorithmParameterSpec */ private static AlgorithmParameterSpec IV = null; /** * SHA1PRNG */ private static final String SHA1PRNG = "SHA1PRNG"; /** * DES默认模式 */ private static final String DES = "DES"; /** * CBC加密模式 */ private static final String DES_CBC_PKCS5PADDING = "DES/CBC/PKCS5Padding"; /** * OFB加密模式 */ private static final String DES_OFB_PKCS5PADDING = "DES/OFB/PKCS5Padding"; /** * CFB加密模式 */ private static final String DES_CFB_PKCS5_PADDING = "DES/CFB/PKCS5Padding"; /** * 加密模式 */ private static final int ENCRYPT_MODE = 1; /** * 解密模式 */ private static final int DECRYPT_MODE = 2; /** * 密钥 */ private Key key; public DESUtil(String str) { getKey(str); } public Key getKey() { return key; } public void setKey(Key key) { this.key = key; } /** * 通过密钥获得key * @param secretKey 密钥 * @author sucb * @date 2017年2月28日下午1:17:58 */ public void getKey(String secretKey) { try { SecureRandom secureRandom = SecureRandom.getInstance(SHA1PRNG); secureRandom.setSeed(secretKey.getBytes()); KeyGenerator generator = null; try { generator = KeyGenerator.getInstance(DES); } catch (NoSuchAlgorithmException e) { } generator.init(secureRandom); IV = new IvParameterSpec(DESIV); this.key = generator.generateKey(); generator = null; } catch (Exception e) { throw new RuntimeException("Error in getKey(String secretKey), Cause: " + e); } } /** * 字符串des加密 * @param data 需要加密的字符串 * @param encryptType 加密模式 (ECB/CBC/OFB/CFB) * @return 加密结果 * @throws Exception 异常 * @author sucb * @date 2017年3月2日下午7:47:37 */ public String encrypt(String data, String encryptType) throws Exception { Cipher cipher = getPattern(encryptType, ENCRYPT_MODE); byte[] pasByte = cipher.doFinal(data.getBytes("UTF-8")); return Base64.encodeBase64String(pasByte); } /** * 字符串des解密 * @param data 需要解密的字符串 * @param decryptType 解密模式 (ECB/CBC/OFB/CFB) * @return 解密结果 * @throws Exception 异常 * @author sucb * @date 2017年3月2日下午7:48:21 */ public String decrypt(String data, String decryptType) throws Exception { Cipher cipher = getPattern(decryptType, DECRYPT_MODE); byte[] pasByte = cipher.doFinal(Base64.decodeBase64(data)); return new String(pasByte, "UTF-8"); } /** * 初始化cipher * @param type 加密/解密模式 (ECB/CBC/OFB/CFB) * @param cipherMode cipher工作模式 1：加密； 2：解密 * @return cipher * @throws Exception 异常 * @author sucb * @date 2017年3月2日下午7:49:16 */ private Cipher getPattern(String type, int cipherMode) throws Exception { Cipher cipher; switch (type){ case CBC : cipher = Cipher.getInstance(DES_CBC_PKCS5PADDING); cipher.init(cipherMode, key, IV); break; case OFB : cipher = Cipher.getInstance(DES_OFB_PKCS5PADDING); cipher.init(cipherMode, key, IV); break; case CFB : cipher = Cipher.getInstance(DES_CFB_PKCS5_PADDING); cipher.init(cipherMode, key, IV); break; default : cipher = Cipher.getInstance(DES); cipher.init(cipherMode, key); break; } return cipher; } /** * 文件 file 进行加密并保存目标文件 destFile 中 * @param file 要加密的文件 如 c:/test/file.txt * @param destFile 加密后存放的文件名 如 c:/ 加密后文件 .txt * @param encryptType 加密模式 (ECB/CBC/OFB/CFB) * @return 加密结果 0：异常 1：加密成功； 5：未找到需要加密的文件 * @author sucb * @date 2017年3月2日下午7:56:08 */ public int encryptFile(String file, String destFile, String encryptType) { int result = 0; try { Cipher cipher = getPattern(encryptType, ENCRYPT_MODE); InputStream is = new FileInputStream(file); OutputStream out = new FileOutputStream(destFile); CipherInputStream cis = new CipherInputStream(is, cipher); byte[] buffer = new byte[1024]; int r; while ((r = cis.read(buffer)) > 0) { out.write(buffer, 0, r); } cis.close(); is.close(); out.close(); result = 1; } catch (FileNotFoundException e) { result = 5; } catch (Exception e) { e.printStackTrace(); } return result; } /** * 文件 file 进行解密并保存目标文件 destFile 中 * @param file 要解密的文件 如 c:/test/file.txt * @param destFile 解密后存放的文件名 如 c:/ 解密后文件 .txt * @param decryptType 解密模式 (ECB/CBC/OFB/CFB) * @return 解密结果 0：解密异常；1：解密正常；5：未找到需要解密的文件 * @author sucb * @date 2017年3月2日下午7:58:56 */ public int decryptFile(String file, String destFile, String decryptType) { int result = 0; try { Cipher cipher = getPattern(decryptType, DECRYPT_MODE); InputStream is = new FileInputStream(file); OutputStream out = new FileOutputStream(destFile); CipherOutputStream cos = new CipherOutputStream(out, cipher); byte[] buffer = new byte[1024]; int r; while ((r = is.read(buffer)) >= 0) { cos.write(buffer, 0, r); } cos.close(); out.close(); is.close(); result = 1; }catch (FileNotFoundException e) { result = 5; } catch (Exception e) { e.printStackTrace(); } return result; } public static void main(String[] args) throws Exception { String testString ="JCccc-你好，我/是/需/要/加*密*的*字*符*串."; System.out.println("加密前内容："+testString); String key="ABCDEFGHIJK"; DESUtil desUtil = new DESUtil(key); String encryptStr = desUtil.encrypt(testString, "CBC"); System.out.println("加密后：" + encryptStr); String decryptStr = desUtil.decrypt(encryptStr, "CBC"); System.out.println("解密后：:" + decryptStr); } }
测试示例：
