AES加密

AES加密，就是对称加密。分享牛系列，分享牛专栏，分享牛。客户端可以保存一个密钥，调用加密的值传入需要加密的值，然后程序根据密钥算出一个新的值，当然了解密也需要，对应的密钥才可以解密。

写一个程序如下：

/**
 *
 */
 
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
 
import java.util.HashMap;
import java.util.Map;
 
/**
 * @author qq 1515308
 */
public class AESEncrypter {
public static void main(String[] args) {
String encryptAsString = new AESEncrypter().encrypt("qq:1515308");
System.out.println(encryptAsString);
String decryptAsString = new AESEncrypter().decryptAsString(encryptAsString);
System.out.println(decryptAsString);
}
 
    private static String aesKeyStr = "NGQxNmUwMjM4M2Y0MTI2MTM3NDI0Y2MxMjA1N2IyNDM=";
 
    private SecretKey aesKey;
 
    private AESEncrypter() {
        aesKey = loadAesKey();
    }
 
    private AESEncrypter(String aes) {
        aesKey = loadAesKey(aes);
    }
 
    private static AESEncrypter INSTANCE;
 
    private static Map<String, AESEncrypter> INSTANCES = new HashMap<>();
 
    public static AESEncrypter getInstance() {
        if (INSTANCE == null) {
            synchronized (aesKeyStr) {
                if (INSTANCE == null) {
                    INSTANCE = new AESEncrypter();
                }
            }
        }
        return INSTANCE;
    }
 
    public static AESEncrypter getInstance(String aes) {
        if (INSTANCES.get(aes) == null) {
            synchronized (aesKeyStr) {
                if (INSTANCES.get(aes) == null) {
                    INSTANCES.put(aes, new AESEncrypter(aes));
                }
            }
        }
        return INSTANCES.get(aes);
    }
 
    public String encrypt(String msg) {
        try {
            Cipher ecipher = Cipher.getInstance("AES");
            ecipher.init(Cipher.ENCRYPT_MODE, aesKey);
            return Encrypter.toHexString(ecipher.doFinal(msg.getBytes()));
        } catch (Exception e) {
            String errMsg = "decrypt error, data:" + msg;
            throw new EncrypterException(errMsg, e);
        }
    }
 
    public byte[] decrypt(String msg) {
        try {
            Cipher dcipher = Cipher.getInstance("AES");
            dcipher.init(Cipher.DECRYPT_MODE, aesKey);
            return dcipher.doFinal(Encrypter.toBytes(msg));
        } catch (Exception e) {
            String errMsg = "decrypt error, data:" + msg;
            throw new EncrypterException(errMsg, e);
        }
    }
 
    public String decryptAsString(String msg) {
        return new String(this.decrypt(msg));
    }
 
    private static SecretKey loadAesKey() {
        String buffer = new String(Base64.decodeBase64(aesKeyStr));
        byte[] keyStr = Encrypter.toBytes(buffer);
        SecretKeySpec aesKey = new SecretKeySpec(keyStr, "AES");
        return aesKey;
    }
 
    private static SecretKey loadAesKey(String aesKeyStr) {
        String buffer = new String(Base64.decodeBase64(aesKeyStr));
        byte[] keyStr = Encrypter.toBytes(buffer);
        SecretKeySpec aesKey = new SecretKeySpec(keyStr, "AES");
        return aesKey;
    }
}

程序的输出如下：

ac8f63257d3d0e85844b4d74269bd153

qq:1515308

加密解密是OK的。

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