加密工具类
昨天的笔记中,包含了CryptoUtils和RSAUtils,今天顺便贴一下两个对称加密的工具类:
DESUtils
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
public class DESUtils extends CryptoUtils {
private final static String KEY_ALGORITHM = "DES";
public static String encrypt(String plainText, String key) {
try {
SecretKey securekey = getSecretKey(key);
Cipher cipher = getCipher(KEY_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
byte[] bt = cipher.doFinal(plainText.getBytes());
return encodeToString(bt);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (IllegalBlockSizeException e) {
throw new RuntimeException(e);
} catch (BadPaddingException e) {
throw new RuntimeException(e);
}
}
public static String decrypt(String encryptText, String key) {
try {
SecretKey securekey = getSecretKey(key);
Cipher cipher = getCipher(KEY_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, securekey, random);
byte[] datas = cipher.doFinal(decodeFromString(encryptText));
return new String(datas);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (IllegalBlockSizeException e) {
throw new RuntimeException(e);
} catch (BadPaddingException e) {
throw new RuntimeException(e);
}
}
private static SecretKey getSecretKey(String key) throws InvalidKeyException {
try {
byte[] datas = key.getBytes();
DESKeySpec dks = new DESKeySpec(datas);
Provider provider = getProvider();
SecretKeyFactory keyFactory = null;
if (null == provider) {
keyFactory = SecretKeyFactory.getInstance(KEY_ALGORITHM);
} else {
keyFactory = SecretKeyFactory.getInstance(KEY_ALGORITHM, provider);
}
SecretKey securekey = keyFactory.generateSecret(dks);
return securekey;
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (InvalidKeySpecException e) {
throw new RuntimeException(e);
}
}
}
AESUtils
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class AESUtils extends CryptoUtils {
private static final String KEY_ALGORITHM = "AES";
public static String encrypt(String plantText, String key) {
try {
Cipher cipher = getCipher(KEY_ALGORITHM);
SecretKey secretKey = getSecretKey(key);
byte[] data = plantText.getBytes();
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] result = cipher.doFinal(data);
return encodeToString(result);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (IllegalBlockSizeException e) {
throw new RuntimeException(e);
} catch (BadPaddingException e) {
throw new RuntimeException(e);
}
}
public static String decrypt(String encryptText, String key) {
try {
Cipher cipher = getCipher(KEY_ALGORITHM);
SecretKey secretKey = getSecretKey(key);
cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] data = decodeFromString(encryptText);
byte[] result = cipher.doFinal(data);
return new String(result);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (IllegalBlockSizeException e) {
throw new RuntimeException(e);
} catch (BadPaddingException e) {
throw new RuntimeException(e);
}
}
private static SecretKey getSecretKey(final String key) {
try {
Provider provider = getProvider();
KeyGenerator kg = null;
if (null == provider) {
kg = KeyGenerator.getInstance(KEY_ALGORITHM);
} else {
kg = KeyGenerator.getInstance(KEY_ALGORITHM, provider);
}
kg.init(128, new SecureRandom(key.getBytes()));
SecretKey secretKey = kg.generateKey();
return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);// 转换为AES专用密钥
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
}
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郴江幸自绕郴山,为谁流下潇湘去?
欲将心事付瑶琴,知音少,弦断有谁听?
倩何人,唤取红巾翠袖,揾英雄泪!
零落成泥碾作尘,只有香如故!