AES加密解密（CBC模式）

高级加密标准（英语：Advanced Encryption
Standard，缩写：AES），在密码学中又称Rijndael加密法，是美国联邦政府采用的一种区块加密标准。这个标准用来替代原先的DES，已经被多方分析且广为全世界所使用。经过五年的甄选流程，高级加密标准由美国国家标准与技术研究院（NIST）于2001年11月26日发布于FIPS
PUB 197，并在2002年5月26日成为有效的标准。2006年，高级加密标准已然成为对称密钥加密中最流行的算法之一。

MD5加密算法：http://blog.csdn.net/huangxiaoguo1/article/details/78042596

Base64加密解密：http://blog.csdn.net/huangxiaoguo1/article/details/78042715

异或加密解密：http://blog.csdn.net/huangxiaoguo1/article/details/78042802

DES加密解密：http://blog.csdn.net/huangxiaoguo1/article/details/78042908

AES自动生成base64密钥加密解密：http://blog.csdn.net/huangxiaoguo1/article/details/78043000

AES加密解密（ECB模式）：http://blog.csdn.net/huangxiaoguo1/article/details/78043098

AES加密解密（CBC模式）：http://blog.csdn.net/huangxiaoguo1/article/details/78043169

非对称RSA加密解密：http://blog.csdn.net/huangxiaoguo1/article/details/78043354

密码说明

严格地说，AES和Rijndael加密法并不完全一样（虽然在实际应用中二者可以互换），因为Rijndael加密法可以支持更大范围的区块和密钥长度：AES的区块长度固定为128
比特，密钥长度则可以是128，192或256比特；而Rijndael使用的密钥和区块长度可以是32位的整数倍，以128位为下限，256比特为上限。加密过程中使用的密钥是由Rijndael密钥生成方案产生。
大多数AES计算是在一个特别的有限域完成的。
AES加密过程是在一个4×4的字节矩阵上运作，这个矩阵又称为“状态（state）”，其初值就是一个明文区块（矩阵中一个元素大小就是明文区块中的一个Byte）。（Rijndael加密法因支持更大的区块，其矩阵行数可视情况增加）加密时，各轮AES加密循环（除最后一轮外）均包含4个步骤：
AddRoundKey — 矩阵中的每一个字节都与该次轮秘钥（round key）做XOR运算；每个子密钥由密钥生成方案产生。
SubBytes — 通过非线性的替换函数，用查找表的方式把每个字节替换成对应的字节。 ShiftRows —
将矩阵中的每个横列进行循环式移位。 MixColumns — 为了充分混合矩阵中各个直行的操作。这个步骤使用线性转换来混合每列的四个字节。
最后一个加密循环中省略MixColumns步骤，而以另一个AddRoundKey取代。

加密标准

对称密码体制的发展趋势将以分组密码为重点。分组密码算法通常由密钥扩展算法和加密（解密）算法两部分组成。密钥扩展算法将b字节用户主密钥扩展成r个子密钥。加密算法由一个密码学上的弱函数f与r个子密钥迭代r次组成。混乱和密钥扩散是分组密码算法设计的基本原则。抵御已知明文的差分和线性攻击，可变长密钥和分组是该体制的设计要点。
AES是美国国家标准技术研究所NIST旨在取代DES的21世纪的加密标准。
AES的基本要求是，采用对称分组密码体制，密钥的长度最少支持为128、192、256，分组长度128位，算法应易于各种硬件和软件实现。1998年NIST开始AES第一轮分析、测试和征集，共产生了15个候选算法。1999年3月完成了第二轮AES2的分析、测试。2000年10月2日美国政府正式宣布选中比利时密码学家Joan
Daemen 和 Vincent Rijmen 提出的一种密码算法RIJNDAEL 作为 AES.
在应用方面，尽管DES在安全上是脆弱的，但由于快速DES芯片的大量生产，使得DES仍能暂时继续使用，为提高安全强度，通常使用独立密钥的三级DES。但是DES迟早要被AES代替。流密码体制较之分组密码在理论上成熟且安全，但未被列入下一代加密标准。
AES加密数据块分组长度必须为128比特，密钥长度可以是128比特、192比特、256比特中的任意一个（如果数据块及密钥长度不足时，会补齐）。AES加密有很多轮的重复和变换。大致步骤如下：1、密钥扩展（KeyExpansion），2、初始轮（Initial
Round），3、重复轮（Rounds），每一轮又包括：SubBytes、ShiftRows、MixColumns、AddRoundKey，4、最终轮（Final
Round），最终轮没有MixColumns。

效果

代码

AESCBCActivity

package tsou.com.encryption.activity.AES;import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;import java.io.UnsupportedEncodingException;import tsou.com.encryption.R;
import tsou.com.encryption.aescbc.AES;/*** CBC模式自设定秘钥,需要设置偏移量* <p>* 什么是aes加密？* <p>* 高级加密标准（英语：Advanced Encryption Standard，缩写：AES），* 在密码学中又称Rijndael加密法，* 是美国联邦政府采用的一种区块加密标准。这个标准用来替代原先的DES，* 已经被多方分析且广为全世界所使用*/
public class AESCBCActivity extends AppCompatActivity implements View.OnClickListener {private EditText encryptionContext;private Button encryption;private TextView tvEncryption;private Button decode;private TextView tvDecode;private Activity mActivity;private Context mContext;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_aes);mActivity = this;mContext = this;encryptionContext = (EditText) findViewById(R.id.et_encryption_context);encryption = (Button) findViewById(R.id.btn_encryption);tvEncryption = (TextView) findViewById(R.id.tv_encryption);decode = (Button) findViewById(R.id.btn_decode);tvDecode = (TextView) findViewById(R.id.tv_decode);initListener();}private void initListener() {encryption.setOnClickListener(this);decode.setOnClickListener(this);}@Overridepublic void onClick(View view) {switch (view.getId()) {case R.id.btn_encryption://加密String encryptionString = encryptionContext.getText().toString().trim();if (TextUtils.isEmpty(encryptionString)) {Toast.makeText(mContext, "请输入加密内容", Toast.LENGTH_SHORT).show();return;}try {String encrypt = AES.getInstance().encrypt(encryptionString.getBytes("UTF8"));tvEncryption.setText(encrypt);} catch (UnsupportedEncodingException e) {e.printStackTrace();}break;case R.id.btn_decode://解密String decodeString = tvEncryption.getText().toString().trim();if (TextUtils.isEmpty(decodeString)) {Toast.makeText(mContext, "请先加密", Toast.LENGTH_SHORT).show();return;}String decrypt = AES.getInstance().decrypt(decodeString);tvDecode.setText(decrypt);break;}}
}

AES

package tsou.com.encryption.aescbc;import java.io.UnsupportedEncodingException;import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;/*** http://blog.csdn.net/qq_33237207/article/details/53114122*/
public class AES {private final String CIPHERMODEPADDING = "AES/CBC/PKCS5Padding";// AES/CBC/PKCS7Paddingprivate SecretKeySpec skforAES = null;private static String ivParameter = "1234huangxiaoguo";// 密钥默认偏移，可更改private byte[] iv = ivParameter.getBytes();private IvParameterSpec IV;String sKey = "huangxiaoguo1234";// key必须为16位，可更改为自己的keyprivate static AES instance = null;public static AES getInstance() {if (instance == null) {synchronized (AES.class) {if (instance == null) {instance = new AES();}}}return instance;}public AES() {byte[] skAsByteArray;try {skAsByteArray = sKey.getBytes("ASCII");skforAES = new SecretKeySpec(skAsByteArray, "AES");} catch (UnsupportedEncodingException e) {e.printStackTrace();}IV = new IvParameterSpec(iv);}public String encrypt(byte[] plaintext) {byte[] ciphertext = encrypt(CIPHERMODEPADDING, skforAES, IV, plaintext);String base64_ciphertext = Base64Encoder.encode(ciphertext);return base64_ciphertext;}public String decrypt(String ciphertext_base64) {byte[] s = Base64Decoder.decodeToBytes(ciphertext_base64);String decrypted = new String(decrypt(CIPHERMODEPADDING, skforAES, IV,s));return decrypted;}private byte[] encrypt(String cmp, SecretKey sk, IvParameterSpec IV,byte[] msg) {try {Cipher c = Cipher.getInstance(cmp);c.init(Cipher.ENCRYPT_MODE, sk, IV);return c.doFinal(msg);} catch (Exception nsae) {}return null;}private byte[] decrypt(String cmp, SecretKey sk, IvParameterSpec IV,byte[] ciphertext) {try {Cipher c = Cipher.getInstance(cmp);c.init(Cipher.DECRYPT_MODE, sk, IV);return c.doFinal(ciphertext);} catch (Exception nsae) {}return null;}
}

Base64Decoder

package tsou.com.encryption.aescbc;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;public class Base64Decoder extends FilterInputStream {private static final char[] chars = {'A', 'B', 'C', 'D', 'E', 'F', 'G','H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T','U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g','h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't','u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6','7', '8', '9', '+', '/'};// A mapping between char values and six-bit integersprivate static final int[] ints = new int[128];static {for (int i = 0; i < 64; i++) {ints[chars[i]] = i;}}private int charCount;private int carryOver;/**** Constructs a new Base64 decoder that reads input from the given* InputStream.** @param in*            the input stream*/public Base64Decoder(InputStream in) {super(in);}/**** Returns the next decoded character from the stream, or -1 if end of* stream was reached.** @return the decoded character, or -1 if the end of the input stream is*         reached* @exception IOException*                if an I/O error occurs*/public int read() throws IOException {// Read the next non-whitespace characterint x;do {x = in.read();if (x == -1) {return -1;}} while (Character.isWhitespace((char) x));charCount++;// The '=' sign is just paddingif (x == '=') {return -1; // effective end of stream}// Convert from raw form to 6-bit formx = ints[x];// Calculate which character we're decoding nowint mode = (charCount - 1) % 4;// First char save all six bits, go for anotherif (mode == 0) {carryOver = x & 63;return read();}// Second char use previous six bits and first two new bits,// save last four bitselse if (mode == 1) {int decoded = ((carryOver << 2) + (x >> 4)) & 255;carryOver = x & 15;return decoded;}// Third char use previous four bits and first four new bits,// save last two bitselse if (mode == 2) {int decoded = ((carryOver << 4) + (x >> 2)) & 255;carryOver = x & 3;return decoded;}// Fourth char use previous two bits and all six new bitselse if (mode == 3) {int decoded = ((carryOver << 6) + x) & 255;return decoded;}return -1; // can't actually reach this line}/**** Reads decoded data into an array of bytes and returns the actual number* of bytes read, or -1 if end of stream was reached.** @param buf*            the buffer into which the data is read* @param off*            the start offset of the data* @param len*            the maximum number of bytes to read* @return the actual number of bytes read, or -1 if the end of the input*         stream is reached* @exception IOException*                if an I/O error occurs*/public int read(byte[] buf, int off, int len) throws IOException {if (buf.length < (len + off - 1)) {throw new IOException("The input buffer is too small: " + len+ " bytes requested starting at offset " + off+ " while the buffer " + " is only " + buf.length+ " bytes long.");}// This could of course be optimizedint i;for (i = 0; i < len; i++) {int x = read();if (x == -1 && i == 0) { // an immediate -1 returns -1return -1;} else if (x == -1) { // a later -1 returns the chars read so farbreak;}buf[off + i] = (byte) x;}return i;}/**** Returns the decoded form of the given encoded string, as a String. Note* that not all binary data can be represented as a String, so this method* should only be used for encoded String data. Use decodeToBytes()* otherwise.** @param encoded*            the string to decode* @return the decoded form of the encoded string*/public static String decode(String encoded) {return new String(decodeToBytes(encoded));}/**** Returns the decoded form of the given encoded string, as bytes.** @param encoded*            the string to decode* @return the decoded form of the encoded string*/public static byte[] decodeToBytes(String encoded) {byte[] bytes = null;try {bytes = encoded.getBytes("UTF-8");} catch (UnsupportedEncodingException ignored) {}Base64Decoder in = new Base64Decoder(new ByteArrayInputStream(bytes));ByteArrayOutputStream out = new ByteArrayOutputStream((int) (bytes.length * 0.67));try {byte[] buf = new byte[4 * 1024]; // 4K bufferint bytesRead;while ((bytesRead = in.read(buf)) != -1) {out.write(buf, 0, bytesRead);}out.close();return out.toByteArray();} catch (IOException ignored) {return null;}}//  public static void main(String[] args) throws Exception {//      if (args.length != 1) {//          System.err.println("Usage: java Base64Decoder fileToDecode");
//          return;
//      }
//
//      Base64Decoder decoder = null;
//      try {//          decoder = new Base64Decoder(new BufferedInputStream(
//                  new FileInputStream(args[0])));
//          byte[] buf = new byte[4 * 1024]; // 4K buffer
//          int bytesRead;
//          while ((bytesRead = decoder.read(buf)) != -1) {//              System.out.write(buf, 0, bytesRead);
//          }
//      } finally {//          if (decoder != null)
//              decoder.close();
//      }
//  }
}

Base64Encoder

package tsou.com.encryption.aescbc;import java.io.ByteArrayOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;public class Base64Encoder extends FilterOutputStream {private static final char[] chars = {'A', 'B', 'C', 'D', 'E', 'F', 'G','H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T','U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g','h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't','u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6','7', '8', '9', '+', '/'};private int charCount;private int carryOver;/**** Constructs a new Base64 encoder that writes output to the given* OutputStream.** @param out*            the output stream*/public Base64Encoder(OutputStream out) {super(out);}/**** Writes the given byte to the output stream in an encoded form.** @exception IOException*                if an I/O error occurs*/public void write(int b) throws IOException {// Take 24-bits from three octets, translate into four encoded chars// Break lines at 76 chars// If necessary, pad with 0 bits on the right at the end// Use = signs as padding at the end to ensure encodedLength % 4 == 0// Remove the sign bit,// thanks to Christian Schweingruber <chrigu@lorraine.ch>if (b < 0) {b += 256;}// First byte use first six bits, save last two bitsif (charCount % 3 == 0) {int lookup = b >> 2;carryOver = b & 3; // last two bitsout.write(chars[lookup]);}// Second byte use previous two bits and first four new bits,// save last four bitselse if (charCount % 3 == 1) {int lookup = ((carryOver << 4) + (b >> 4)) & 63;carryOver = b & 15; // last four bitsout.write(chars[lookup]);}// Third byte use previous four bits and first two new bits,// then use last six new bitselse if (charCount % 3 == 2) {int lookup = ((carryOver << 2) + (b >> 6)) & 63;out.write(chars[lookup]);lookup = b & 63; // last six bitsout.write(chars[lookup]);carryOver = 0;}charCount++;// Add newline every 76 output chars (that's 57 input chars)if (charCount % 57 == 0) {out.write('\n');}}/**** Writes the given byte array to the output stream in an encoded form.** @param buf*            the data to be written* @param off*            the start offset of the data* @param len*            the length of the data* @exception IOException*                if an I/O error occurs*/public void write(byte[] buf, int off, int len) throws IOException {// This could of course be optimizedfor (int i = 0; i < len; i++) {write(buf[off + i]);}}/**** Closes the stream, this MUST be called to ensure proper padding is* written to the end of the output stream.** @exception IOException*                if an I/O error occurs*/public void close() throws IOException {// Handle leftover bytesif (charCount % 3 == 1) { // one leftoverint lookup = (carryOver << 4) & 63;out.write(chars[lookup]);out.write('=');out.write('=');} else if (charCount % 3 == 2) { // two leftoversint lookup = (carryOver << 2) & 63;out.write(chars[lookup]);out.write('=');}super.close();}/**** Returns the encoded form of the given unencoded string. The encoder uses* the ISO-8859-1 (Latin-1) encoding to convert the string to bytes. For* greater control over the encoding, encode the string to bytes yourself* and use encode(byte[]).** @param unencoded*            the string to encode* @return the encoded form of the unencoded string*/public static String encode(String unencoded) {byte[] bytes = null;try {bytes = unencoded.getBytes("UTF-8");} catch (UnsupportedEncodingException ignored) {}return encode(bytes);}/**** Returns the encoded form of the given unencoded string.** @param bytes*            the bytes to encode* @return the encoded form of the unencoded string*/public static String encode(byte[] bytes) {ByteArrayOutputStream out = new ByteArrayOutputStream((int) (bytes.length * 1.37));Base64Encoder encodedOut = new Base64Encoder(out);try {encodedOut.write(bytes);encodedOut.close();return out.toString("UTF-8");} catch (IOException ignored) {return null;}}//    public static void main(String[] args) throws Exception {//        if (args.length != 1) {//            System.err
//                    .println("Usage: java com.oreilly.servlet.Base64Encoder fileToEncode");
//            return;
//        }
//
//        Base64Encoder encoder = null;
//        BufferedInputStream in = null;
//        try {//            encoder = new Base64Encoder(System.out);
//            in = new BufferedInputStream(new FileInputStream(args[0]));
//
//            byte[] buf = new byte[4 * 1024]; // 4K buffer
//            int bytesRead;
//            while ((bytesRead = in.read(buf)) != -1) {//                encoder.write(buf, 0, bytesRead);
//            }
//        } finally {//            if (in != null)
//                in.close();
//            if (encoder != null)
//                encoder.close();
//        }
//    }
}

Demo下载地址：java-android：AES加密，RAS加密，DES加密，MD5加密，Base64加密，异或加密