C#与java中的AES加解密互解算法

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C#与java中的AES加解密互解算法 - Smallbyte - 博客园
一、C#版AES加解密算法
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   public class AESCode
    {
        public string Key { get; set; }
        public string Encrypt(string val)
        {
            if (string.IsNullOrEmpty(val))
                return null;

if CSP

using (AesCryptoServiceProvider des = new AesCryptoServiceProvider())

else

using (AesManaged des = new AesManaged())

endif

{
                byte[] inputByteArray = Encoding.UTF8.GetBytes(val);
                byte[] _key;
                byte[] _iv;
                GeneralKeyIV(this.Key, out _key, out _iv);
                des.Key = _key;
                des.IV = _iv;
                using (MemoryStream ms = new MemoryStream())
                {

using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))

{
                        cs.Write(inputByteArray, 0, inputByteArray.Length);
                        cs.FlushFinalBlock();
                        byte[] bytes = (byte[])ms.ToArray();
                        return Convert.ToBase64String(bytes);
                    }
                }
            }
        }
        public string Decrypt(string val)
        {
            if (string.IsNullOrEmpty(val))
                return null;

if CSP

using (AesCryptoServiceProvider des = new AesCryptoServiceProvider())

else

using (AesManaged des = new AesManaged())

endif

{
                byte[] inputByteArray = Convert.FromBase64String(val);
                byte[] _key;
                byte[] _iv;
                GeneralKeyIV(this.Key, out _key, out _iv);
                des.Key = _key;
                des.IV = _iv;
                using (MemoryStream ms = new MemoryStream())
                {

using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))

{
                        cs.Write(inputByteArray, 0, inputByteArray.Length);
                        cs.FlushFinalBlock();
                        return Encoding.UTF8.GetString(ms.ToArray());
                    }
                }
            }
        }
        public void GeneralKeyIV(string keyStr, out byte[] key, out byte[] iv)
        {
            byte[] bytes = Encoding.UTF8.GetBytes(keyStr);
            key = SHA256Managed.Create().ComputeHash(bytes);
            iv = MD5.Create().ComputeHash(bytes);
        }
}
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二、Java版算法
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import java.security.MessageDigest;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
public class AESCode {
/*
     * 提供密钥和向量进行加密
     *
     * @param sSrc
     * @param key
     * @param iv
     * @return
     * @throws Exception
     
/

public static String Encrypt(String sSrc, byte[] key, byte[] iv) throws Exception {

SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");// "算法/模式/补码方式"

IvParameterSpec _iv = new IvParameterSpec(iv);// 使用CBC模式,需要一个向量iv,可增加加密算法的强度

cipher.init(Cipher.ENCRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return Base64.encodeBase64String(encrypted);
    }
    /*
     * 提供密钥和向量进行解密
     *
     * @param sSrc
     * @param key
     * @param iv
     * @return
     * @throws Exception
     
/

public static String Decrypt(String sSrc, byte[] key, byte[] iv) throws Exception {

SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec _iv = new IvParameterSpec(iv);
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = Base64.decodeBase64(sSrc);
        byte[] original = cipher.doFinal(encrypted);
        return new String(original, "utf-8");
    }
    /*
     * 使用密钥进行加密
     *
     * @param sSrc
     * @param keyStr
     * @return
     * @throws Exception
     
/
    public static String Encrypt(String sSrc, String keyStr) throws Exception {
        byte[] key = GeneralKey(keyStr);
        byte[] iv = GeneralIv(keyStr);
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");// "算法/模式/补码方式"

IvParameterSpec _iv = new IvParameterSpec(iv);
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return Base64.encodeBase64String(encrypted);
    }
    /
     * 使用密钥进行解密
     *
     * @param sSrc
     * @param keyStr
     * @return
     * @throws Exception
     */
    public static String Decrypt(String sSrc, String keyStr) throws Exception {
        byte[] key = GeneralKey(keyStr);
        byte[] iv = GeneralIv(keyStr);
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec _iv = new IvParameterSpec(iv);
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = Base64.decodeBase64(sSrc);// 先用base64解码
        byte[] original = cipher.doFinal(encrypted);
        return new String(original, "utf-8");
    }
    /

     * 构建密钥字节码
     *
     * @param keyStr
     * @return
     * @throws Exception
     /
    private static byte[] GeneralKey(String keyStr) throws Exception {
        byte[] bytes = keyStr.getBytes("utf-8");
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(bytes);
        return md.digest();
    }
    /

     * 构建加解密向量字节码
     *
     * @param keyStr
     * @return
     * @throws Exception
     
/
    private static byte[] GeneralIv(String keyStr) throws Exception {
        byte[] bytes = keyStr.getBytes("utf-8");
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(bytes);
        return md.digest();
    }
}
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 java版需要commons-codec-1.10.jar,local_policy.jar,US_export_policy.jar

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