JAVA安卓和C# 3DES加密解密的兼容性问题
近 一个项目.net 要调用JAVA的WEB SERVICE，数据采用3DES加密，涉及到两种语言3DES一致性的问题，
下面分享一下，
这里的KEY采用Base64编码，便用分发，因为Java的Byte范围为-128至127，c#的Byte范围是0-255
核心是确定Mode和Padding，关于这两个的意思可以搜索3DES算法相关文章
一个是 C#采用 CBC Mode，PKCS7 Padding,Java采用CBC Mode，PKCS5Padding Padding,
另一个是C#采用ECB Mode，PKCS7 Padding,Java采用ECB Mode，PKCS5Padding Padding,
注意：Java的ECB模式不需要IV
对字符加密时，双方采用的都是UTF-8编码
下面是C#代码
/// <summary> /// DES3加密解密 /// </summary> public class Des3 { #region CBC模式** /// <summary> /// DES3 CBC模式加密 /// </summary> /// <param name="key">密钥</param> /// <param name="iv">IV</param> /// <param name="data">明文的byte数组</param> /// <returns>密文的byte数组</returns> public static byte[] Des3EncodeCBC( byte[] key, byte[] iv, byte[] data ) { //复制于MSDN try { // Create a MemoryStream. MemoryStream mStream = new MemoryStream(); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.CBC; //默认值 tdsp.Padding = PaddingMode.PKCS7; //默认值 // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream( mStream, tdsp.CreateEncryptor( key, iv ), CryptoStreamMode.Write ); // Write the byte array to the crypto stream and flush it. cStream.Write( data, 0, data.Length ); cStream.FlushFinalBlock(); // Get an array of bytes from the // MemoryStream that holds the // encrypted data. byte[] ret = mStream.ToArray(); // Close the streams. cStream.Close(); mStream.Close(); // Return the encrypted buffer. return ret; } catch ( CryptographicException e ) { Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message ); return null; } } /// <summary> /// DES3 CBC模式解密 /// </summary> /// <param name="key">密钥</param> /// <param name="iv">IV</param> /// <param name="data">密文的byte数组</param> /// <returns>明文的byte数组</returns> public static byte[] Des3DecodeCBC( byte[] key, byte[] iv, byte[] data ) { try { // Create a new MemoryStream using the passed // array of encrypted data. MemoryStream msDecrypt = new MemoryStream( data ); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.CBC; tdsp.Padding = PaddingMode.PKCS7; // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream csDecrypt = new CryptoStream( msDecrypt, tdsp.CreateDecryptor( key, iv ), CryptoStreamMode.Read ); // Create buffer to hold the decrypted data. byte[] fromEncrypt = new byte[data.Length]; // Read the decrypted data out of the crypto stream // and place it into the temporary buffer. csDecrypt.Read( fromEncrypt, 0, fromEncrypt.Length ); //Convert the buffer into a string and return it. return fromEncrypt; } catch ( CryptographicException e ) { Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message ); return null; } } #endregion #region ECB模式 /// <summary> /// DES3 ECB模式加密 /// </summary> /// <param name="key">密钥</param> /// <param name="iv">IV(当模式为ECB时，IV无用)</param> /// <param name="str">明文的byte数组</param> /// <returns>密文的byte数组</returns> public static byte[] Des3EncodeECB( byte[] key, byte[] iv, byte[] data ) { try { // Create a MemoryStream. MemoryStream mStream = new MemoryStream(); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.ECB; tdsp.Padding = PaddingMode.PKCS7; // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream( mStream, tdsp.CreateEncryptor( key, iv ), CryptoStreamMode.Write ); // Write the byte array to the crypto stream and flush it. cStream.Write( data, 0, data.Length ); cStream.FlushFinalBlock(); // Get an array of bytes from the // MemoryStream that holds the // encrypted data. byte[] ret = mStream.ToArray(); // Close the streams. cStream.Close(); mStream.Close(); // Return the encrypted buffer. return ret; } catch ( CryptographicException e ) { Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message ); return null; } } /// <summary> /// DES3 ECB模式解密 /// </summary> /// <param name="key">密钥</param> /// <param name="iv">IV(当模式为ECB时，IV无用)</param> /// <param name="str">密文的byte数组</param> /// <returns>明文的byte数组</returns> public static byte[] Des3DecodeECB( byte[] key, byte[] iv, byte[] data ) { try { // Create a new MemoryStream using the passed // array of encrypted data. MemoryStream msDecrypt = new MemoryStream( data ); TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider(); tdsp.Mode = CipherMode.ECB; tdsp.Padding = PaddingMode.PKCS7; // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream csDecrypt = new CryptoStream( msDecrypt, tdsp.CreateDecryptor( key, iv ), CryptoStreamMode.Read ); // Create buffer to hold the decrypted data. byte[] fromEncrypt = new byte[data.Length]; // Read the decrypted data out of the crypto stream // and place it into the temporary buffer. csDecrypt.Read( fromEncrypt, 0, fromEncrypt.Length ); //Convert the buffer into a string and return it. return fromEncrypt; } catch ( CryptographicException e ) { Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message ); return null; } } #endregion /// <summary> /// 类测试 /// </summary> public static void Test() { System.Text.Encoding utf8 = System.Text.Encoding.UTF8; //key为abcdefghijklmnopqrstuvwx的Base64编码 byte[] key = Convert.FromBase64String( "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4" ); byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; //当模式为ECB时，IV无用 byte[] data = utf8.GetBytes( "中国ABCabc123" ); System.Console.WriteLine( "ECB模式:" ); byte[] str1 = Des3.Des3EncodeECB( key, iv, data ); byte[] str2 = Des3.Des3DecodeECB( key, iv, str1 ); System.Console.WriteLine( Convert.ToBase64String( str1 ) ); System.Console.WriteLine( System.Text.Encoding.UTF8.GetString( str2 ) ); System.Console.WriteLine(); System.Console.WriteLine( "CBC模式:" ); byte[] str3 = Des3.Des3EncodeCBC( key, iv, data ); byte[] str4 = Des3.Des3DecodeCBC( key, iv, str3 ); System.Console.WriteLine( Convert.ToBase64String( str3 ) ); System.Console.WriteLine( utf8.GetString( str4 ) ); System.Console.WriteLine(); } }
下面是java代码
import java.security.Key; import javax.crypto.Cipher; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESedeKeySpec; import javax.crypto.spec.IvParameterSpec; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class Des3 { public static void main(String[] args) throws Exception { byte[] key=new BASE64Decoder().decodeBuffer("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4"); byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 }; byte[] data="中国ABCabc123".getBytes("UTF-8"); System.out.println("ECB加密解密"); byte[] str3 = des3EncodeECB(key,data ); byte[] str4 = ees3DecodeECB(key, str3); System.out.println(new BASE64Encoder().encode(str3)); System.out.println(new String(str4, "UTF-8")); System.out.println(); System.out.println("CBC加密解密"); byte[] str5 = des3EncodeCBC(key, keyiv, data); byte[] str6 = des3DecodeCBC(key, keyiv, str5); System.out.println(new BASE64Encoder().encode(str5)); System.out.println(new String(str6, "UTF-8")); } /** * ECB加密,不要IV * @param key 密钥 * @param data 明文 * @return Base64编码的密文 * @throws Exception */ public static byte[] des3EncodeECB(byte[] key, byte[] data) throws Exception { Key deskey = null; DESedeKeySpec spec = new DESedeKeySpec(key); SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede"); deskey = keyfactory.generateSecret(spec); Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, deskey); byte[] bOut = cipher.doFinal(data); return bOut; } /** * ECB解密,不要IV * @param key 密钥 * @param data Base64编码的密文 * @return 明文 * @throws Exception */ public static byte[] ees3DecodeECB(byte[] key, byte[] data) throws Exception { Key deskey = null; DESedeKeySpec spec = new DESedeKeySpec(key); SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede"); deskey = keyfactory.generateSecret(spec); Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, deskey); byte[] bOut = cipher.doFinal(data); return bOut; } /** * CBC加密 * @param key 密钥 * @param keyiv IV * @param data 明文 * @return Base64编码的密文 * @throws Exception */ public static byte[] des3EncodeCBC(byte[] key, byte[] keyiv, byte[] data) throws Exception { Key deskey = null; DESedeKeySpec spec = new DESedeKeySpec(key); SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede"); deskey = keyfactory.generateSecret(spec); Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding"); IvParameterSpec ips = new IvParameterSpec(keyiv); cipher.init(Cipher.ENCRYPT_MODE, deskey, ips); byte[] bOut = cipher.doFinal(data); return bOut; } /** * CBC解密 * @param key 密钥 * @param keyiv IV * @param data Base64编码的密文 * @return 明文 * @throws Exception */ public static byte[] des3DecodeCBC(byte[] key, byte[] keyiv, byte[] data) throws Exception { Key deskey = null; DESedeKeySpec spec = new DESedeKeySpec(key); SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede"); deskey = keyfactory.generateSecret(spec); Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding"); IvParameterSpec ips = new IvParameterSpec(keyiv); cipher.init(Cipher.DECRYPT_MODE, deskey, ips); byte[] bOut = cipher.doFinal(data); return bOut; } }
下面是运行结果
ECB模式:
rmWB4+r9Ug93WI0KAEuMig==
中国ABCabc123
CBC模式:
4aabWF8UFour/vNfnzJrjw==
中国ABCabc123
我自己的调用方法是
1: static void Main(string[] args)
2: {
3:
4: System.Text.Encoding utf8 = System.Text.Encoding.UTF8;
5:
6: byte[] key = utf8.GetBytes("lidashu2013_fromc#tojava"); //加密的密钥
7:
8: //---- 加密
9: string str1 = "abc"; //准备要加密的原文
10: byte[] byte1 = utf8.GetBytes(str1); //获得原文的字节
11: byte[] byte2 = Des3.Des3EncodeECB(key, null, byte1); //已经加密过的字节
12: string str2 = Convert.ToBase64String(byte2); //将字节转换为 Base64位的编码
13: System.Console.WriteLine(str2); //Pv8WLS7RSYRD8ushCAH/Zg==
14:
15:
16: //--- 解密
17: string strJiaMi = "0TvZFgRLf5s="; //需要解密的的密码
18: byte[] alreadyEnCodeByte = Convert.FromBase64String(strJiaMi); //从Base64位转换为字节
19: byte[] toDecodeByte = Des3.Des3DecodeECB(key, null, alreadyEnCodeByte); //解密
20: //将解密后的字节，转换成string字符串
21: //(注意，如果解密出来的字符串的长度不是8的倍数，则会自动在后面补\0多次，例如解密出来是abcde,长度为5,则会变成 abc\0\0\0\0\0 加多3次)
22: string strShow = System.Text.Encoding.Default.GetString(toDecodeByte);
23: strShow = strShow.Replace("\0", "");
24: System.Console.WriteLine(strShow);
25:
26:
27:
28:
29:
30:
31: Console.ReadKey();
32: }
33:
注意，如果是在C#端自己加密，自己解密的时候，会发现一个补\0的问题，例如 原文是 abcde ，加密之后，再解密变成了 abcde\0\0\0
这里的\0的次数，是看你的原文和8相差多少，如果不够8位就补几次。原文是abcde是5位，则会自动补齐\0 补3次
如果是c#端加密，发给java解密，则不会有问题，不会存在\0的问题
如果是java端加密，发给c#解密，则还是会补\0
对于\0 我们应该人为的replace替换掉