AES加密CBC模式下Java和C#互转

C#加解密工具类代码

    class JdAesCBCTool
    {

        public static string Encrypt(string toEncrypt, string key, string iv)
        {
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] ivArray = UTF8Encoding.UTF8.GetBytes(iv);
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.IV = ivArray;
            rDel.Mode = CipherMode.CBC;
            rDel.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = rDel.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            //return Convert.ToBase64String(resultArray, 0, resultArray.Length);
            return ToHexString(resultArray);
        }

        public static string Decrypt(string toDecrypt, string key, string iv)
        {
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] ivArray = UTF8Encoding.UTF8.GetBytes(iv);
            byte[] toEncryptArray = ConvertHexStringToBytes(toDecrypt);

            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.IV = ivArray;
            rDel.Mode = CipherMode.CBC;
            rDel.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = rDel.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return UTF8Encoding.UTF8.GetString(resultArray);
        }

        public static string ToHexString(byte[] bytes) // 0xae00cf => "AE00CF "
        {
            string hexString = string.Empty;
            if (bytes != null)
            {
                StringBuilder strB = new StringBuilder();

                for (int i = 0; i < bytes.Length; i++)
                {
                    strB.Append(bytes[i].ToString("x2"));
                }
                hexString = strB.ToString();
            }
            return hexString;
        }

        /// <summary>
        /// 16进制原码字符串转字节数组
        /// </summary>
        /// <param name="hexString">"AABBCC"或"AA BB CC"格式的字符串</param>
        /// <returns></returns>
        public static byte[] ConvertHexStringToBytes(string hexString)
        {
            hexString = hexString.Trim();
            if (hexString.Length % 2 != 0)
            {
                throw new ArgumentException("参数长度不正确");
            }

            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
            {
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            }

            return returnBytes;
        }
    }

Java加解密工具类代码

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;

public class AesUtil {
  private static final String CHARSET_NAME = "UTF-8";
  
  private static final String INSTANCE_NAME = "AES/CBC/PKCS5Padding";
  
  private static final String ENCRYPT_METHOD = "AES";
  
  public static String decrypt(String str, String key, String ivStr) {
    try {
      if (str != null && str.trim().length() >= 1) {
        SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), "AES");
        IvParameterSpec iv = new IvParameterSpec(ivStr.getBytes());
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(2, skeySpec, iv);
        byte[] encrypted = decodeHex(str);
        byte[] original = cipher.doFinal(encrypted);
        return new String(original, "UTF-8");
      } 
    } catch (Exception e) {
      e.printStackTrace();
    } 
    return null;
  }
  
  public static String encrypt(String str, String key, String ivStr) {
    try {
      if (str != null && str.trim().length() >= 1) {
        SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), "AES");
        IvParameterSpec iv = new IvParameterSpec(ivStr.getBytes());
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(1, skeySpec, iv);
        byte[] encrypted = str.getBytes("UTF-8");
        byte[] original = cipher.doFinal(encrypted);
        String originalString = encodeHex(original);
        return originalString;
      } 
    } catch (Exception e) {
      e.printStackTrace();
    } 
    return null;
  }
  
  public static String encodeHex(byte[] input) {
    return Hex.encodeHexString(input);
  }
  
  public static byte[] decodeHex(String input) {
    try {
      return Hex.decodeHex(input.toCharArray());
    } catch (DecoderException e) {
      e.printStackTrace();
      return null;
    } 
  }
}