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cn.wandersnail.common.EncryptUtils Maven / Gradle / Ivy
package cn.wandersnail.common;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
import java.util.Base64;
import java.util.Random;
/**
* date: 2019/8/7 16:19
* author: zengfansheng
*/
public class EncryptUtils {
public static final String MD5 = "MD5";
public static final String SHA1 = "SHA1";
/**
* 在MD5或SHA1加密过的字符串基础上加上分隔符
*
* @param code MD5或SHA1加密过的字符串
* @param separator 分隔符
*/
public static String addSeparator(String code, String separator) {
try {
StringBuilder sb = new StringBuilder();
int loopTimes = code.length();
int i = 0;
while (i < loopTimes) {
if (i != loopTimes - 2) {
sb.append(code.substring(i, i + 2)).append(separator == null ? "" : separator);
} else {
sb.append(code.substring(i, i + 2));
}
i += 2;
}
return sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 获取经过MD5加密后的字符串
*
* @param plainText 要加密的字符串
* @param iterations 迭代加密的次数，0表示不加密，1表示md5(plainText), 2表示md5(md5(plainText))...
* @return 经过MD5算法加密的字符串形式的32位16进制, 如果参数表示的字符串为空，返回null
*/
public static String getMD5Code(String plainText, int iterations) {
if (iterations > 0) {
iterations--;
String result = getMD5Code(plainText);
if (iterations > 0 && result != null) {
result = getMD5Code(result, iterations);
}
return result;
}
return null;
}
/**
* 获取经过SHA1加密后的字符串
*
* @param plainText 要加密的字符串
* @param iterations 迭代加密的次数，0表示不加密，1表示md5(plainText), 2表示md5(md5(plainText))...
* @return 经过SHA1算法加密的字符串形式的32位16进制, 如果参数表示的字符串为空，返回null
*/
public static String getSHA1Code(String plainText, int iterations) {
if (iterations > 0) {
iterations--;
String result = getSHA1Code(plainText);
if (iterations > 0 && result != null) {
result = getSHA1Code(result, iterations);
}
return result;
}
return null;
}
/**
* 将MD5或SHA1码一段字符串替换成随机16进制字符
*
* @param code 需要替换的MD5或SHA1码
* @param offset 偏移量，即从第几个字符开始替换
* @param len 要替换的字符数
* @return 替换后的新字符串，如果参数表示的MD5码为空，则返回null
*/
public static String replaceMessageDigestCharacter(String code, int offset, int len) {
char[] charArr = "1234567890abcdef".toCharArray();
char[] md5Arr = code.toCharArray();
Random random = new Random();
for (int i = offset; i < offset + len; i++) {
char randomChar = charArr[random.nextInt(charArr.length)];
md5Arr[i] = randomChar;
}
return new String(md5Arr, 0, md5Arr.length);
}
/**
* 获取经过MD5加密后的字符串
*
* @param plainText 要加密的字符串
*/
public static String getMD5Code(String plainText) {
return encryptByMessageDigest(plainText.getBytes(), MD5);
}
/**
* 获取经过SHA1加密后的字符串
*
* @param plainText 要加密的字符串
*/
public static String getSHA1Code(String plainText) {
return encryptByMessageDigest(plainText.getBytes(), SHA1);
}
/**
* 获取文件的md5值
*
* @param path 文件的路径
* @return md5值，文件不存在返回null
*/
public static String getFileMD5Code(String path) {
InputStream fis = null;
try {
fis = new FileInputStream(path);
String code = getMD5Code(fis);
fis.close();
return code;
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
IOUtils.closeQuietly(fis);
}
}
/**
* 获取文件的SHA1值
*
* @param path 文件的路径
* @return SHA1值，文件不存在返回null
*/
public static String getFileSHA1Code(String path) {
InputStream fis = null;
try {
fis = new FileInputStream(path);
String code = getSHA1Code(fis);
fis.close();
return code;
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
IOUtils.closeQuietly(fis);
}
}
/**
* 获取文件的md5值
*
* @param file 文件
* @return md5值，文件不存在返回null
*/
public static String getFileMD5Code(File file) {
return file == null ? null : getFileMD5Code(file.getPath());
}
/**
* 获取文件的SHA1值
*
* @param file 文件
* @return SHA1值，文件不存在返回null
*/
public static String getFileSHA1Code(File file) {
return file == null ? null : getFileSHA1Code(file.getPath());
}
/**
* 从输入流获取MD5值
*
* @param inputStream 输入流
*/
public static String getMD5Code(InputStream inputStream) {
return encryptByMessageDigest(inputStream, MD5);
}
/**
* 从输入流获取SHA1值
*
* @param inputStream 输入流
*/
public static String getSHA1Code(InputStream inputStream) {
return encryptByMessageDigest(inputStream, SHA1);
}
/**
* 加密输入流，不执行流关闭
*
* @param inputStream 输入流
* @param algorithm 算法。[MD5], [SHA1]
*/
public static String encryptByMessageDigest(InputStream inputStream, String algorithm) {
try {
MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
byte[] buf = new byte[40960];
int len;
while ((len = inputStream.read(buf)) != -1) {
messageDigest.update(buf, 0, len);
}
return encryptByMessageDigest(messageDigest);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 执行加密
*
* @param bytes 需要加密的字节
* @param algorithm 算法。[MD5], [SHA1]
*/
public static String encryptByMessageDigest(byte[] bytes, String algorithm) {
try {
MessageDigest md = MessageDigest.getInstance(algorithm);
md.update(bytes);
return encryptByMessageDigest(md);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private static String encryptByMessageDigest(MessageDigest md) {
byte[] digest = md.digest();
StringBuilder toRet = new StringBuilder();
for (byte b : digest) {
String hex = StringUtils.toHex(((int) b) & 0xff);
toRet.append(hex);
}
return toRet.toString();
}
/**
* 加密一个文本，返回base64编码后的内容。
*
* @param seed 种子 密码
* @param plain 原文
* @return 密文
*/
public static String encrypt(String seed, String plain, String iv) throws Exception {
SecretKeySpec keySpec = new SecretKeySpec(seed.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(iv.getBytes()));
return Base64.getEncoder().encodeToString(cipher.doFinal(plain.getBytes()));
}
/**
* 解密base64编码后的密文
*
* @param seed 种子 密码
* @param encrypted 密文
* @return 原文
*/
public static String decrypt(String seed, String encrypted, String iv) throws Exception {
SecretKeySpec keySpec = new SecretKeySpec(seed.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv.getBytes()));
byte[] enc = Base64.getDecoder().decode(encrypted.getBytes());
return new String(cipher.doFinal(enc));
}
}
