JAVA语言AES CBC模式加解密数据实现(java aes ctr)

JAVA 语言AES CBC模式加解密数据实现

在多可文档系统中文件接口需要和其他系统实现用户统一登录，其他数据加密传输，要保障算法和数据的一致性对系统接口使用有很大帮助。系统选择使用AES加密算法的CBC模式（128位密钥），实现各系统间加密数据的传输。多可提供各种语言的算法实现，以下是JAVA语言的具体算法实现（其他语言参考博主相关文章）：

加解密文本用16进制字符串表示，如果您需要base64编码请修改编码和解密部分即可。

package aes;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.net.URLEncoder;

import javax.crypto.Cipher;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

public class hello {

public static final String IV = "1234567890ABCDEF";

public static final String KEY_ALGORITHM = "AES";

public static final String CIPHER_ALGORITHM_CBC = "AES/CBC/NoPadding";

public static String bytes2HexString(byte[] b) {

StringBuffer result = new StringBuffer();

for (int i = 0; i < b.length; i++) {

result.append(String.format("%02X",b[i]));

}

return result.toString();

}

public static byte[] aesCBCEncrypt(byte[] data, byte[] key) throws Exception {

if(key.length != 16) {

throw new RuntimeException("Invalid AES key length (must be 16 bytes)");

} else {

Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);

int blockSize = cipher.getBlockSize();

int length = data.length;

// 计算需填充长度

if (length % blockSize != 0) {

length = length + (blockSize - (length % blockSize));

}

byte[] plaintext = new byte[length];

// 拷贝数据

System.arraycopy(data, 0, plaintext, 0, data.length);

cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, KEY_ALGORITHM), new IvParameterSpec(IV.getBytes()));

return cipher.doFinal(plaintext);

}

}

private static byte charToByte(char c) {

return (byte) "0123456789ABCDEF".indexOf(c);

}

public static byte[] hex2Bytes(String s) throws Exception{

int len = s.length();

if (len % 2 == 1){

throw new RuntimeException("Invalid data");

}

char[] hexChars = s.toCharArray();

byte[] r = new byte[len / 2];

for (int i = 0; i < len / 2; i++) {

int pos = i * 2;

r[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));

}

return r;

}

public static String aesCBCDecrypt(byte[] data, byte[] key) throws Exception {

if(key.length != 16) {

throw new RuntimeException("Invalid AES key length (must be 16 bytes)");

} else {

Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);

cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, KEY_ALGORITHM), new IvParameterSpec(IV.getBytes()));

//

byte[] plaintext = cipher.doFinal(data);

return new String(plaintext, "utf-8").trim();

}

}

public static void main(String[] args) {

String key = "2018201820182018";

String inStr = "多可文档管理系统";

try

{

//加密

byte[] outBytes = aesCBCEncrypt(inStr.getBytes("utf-8"), key.getBytes("utf-8"));

String s = bytes2HexString(outBytes);

System.out.println(s);

//解密

String s2 = aesCBCDecrypt(hex2Bytes(s), key.getBytes("utf-8"));

System.out.println(s2);

} catch (Exception e) {

e.printStackTrace();

}

}

}