MD5、SHA所支持的加密算法，加盐处理

 SHAUtils工具类 提供5种SHA的算法和加盐处理

import android.support.annotation.Nullable;
import android.support.annotation.StringDef;import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Random;/*** SHA 工具类*/
class SHAUtils {public final static String SHA1 = "sha-1";public final static String SHA224 = "sha-224";public final static String SHA256 = "sha-256";public final static String SHA384 = "sha-384";public final static String SHA512 = "sha-512";@StringDef({SHA1, SHA224, SHA256, SHA384, SHA512})@interface SHAType {}/*** Sha加密** @param string 加密字符串* @return SHA加密结果字符串*/public static String SHA(String string, @Nullable @SHAType String type) {if (TextUtils.isEmpty(string)) return "";if (TextUtils.isEmpty(type)) type = SHA256;try {MessageDigest md5 = MessageDigest.getInstance(type);byte[] bytes = md5.digest((string).getBytes());String result = "";for (byte b : bytes) {String temp = Integer.toHexString(b & 0xff);if (temp.length() == 1) {temp = "0" + temp;}result += temp;}return result;} catch (NoSuchAlgorithmException e) {e.printStackTrace();}return "";}/**** @param shaStr 要加密的文本* @param type 含有加盐的HashMap：salt sha* @return*/public static HashMap<String,String> SHASalt(String shaStr, @Nullable @SHAType String type) {HashMap<String,String> resultSalt = new HashMap<>();if (TextUtils.isEmpty(shaStr)) return resultSalt;if (TextUtils.isEmpty(type)) type = SHA256;String salt = generateSalt();shaStr = shaStr + salt;try {MessageDigest md5 = MessageDigest.getInstance(type);byte[] bytes = md5.digest((shaStr).getBytes());String result = "";for (byte b : bytes) {String temp = Integer.toHexString(b & 0xff);if (temp.length() == 1) {temp = "0" + temp;}result += temp;}resultSalt.put("salt",salt);resultSalt.put("sha",result);return resultSalt;} catch (NoSuchAlgorithmException e) {e.printStackTrace();}return resultSalt;}/*** 生成16位随机盐** @return*/private static String generateSalt() {// 生成一个16位的随机盐数Random random = new Random();StringBuilder sBuilder = new StringBuilder(16);sBuilder.append(random.nextInt(99999999)).append(random.nextInt(99999999));int len = sBuilder.length();if (len < 16) {for (int i = 0; i < 16 - len; i++) {sBuilder.append("0");}}return sBuilder.toString();}//加盐处理/*** 验证加盐后是否和原密码一致** @param string 原密码* @param md5str 加密之后的密码* @return boolean true表示和原密码一致   false表示和原密码不一致*/public static boolean getSaltverifySHA(String string,String salt, @Nullable @SHAType String type, String md5str) {return SHA(string + salt, type).equals(String.valueOf(md5str));}}

里面用到的工具判断类

public class TextUtils {public static boolean isEmpty(String str) {return null == str || str.isEmpty();}
}

MD5Utils工具类，提供32位 16位的加密算法，和32位的加盐处理

import android.support.annotation.NonNull;
import android.support.annotation.StringDef;import java.security.MessageDigest;
import java.util.Random;class MD5Utils {public final static String MD5_16 = "16";public final static String MD5_32 = "32";@StringDef({MD5_16, MD5_32})@interface MD5Type {}/*** byte[]字节数组 转换成 十六进制字符串** @param arr 要转换的byte[]字节数组* @return String 返回十六进制字符串*/private static String hex(byte[] arr) {StringBuffer sb = new StringBuffer();for (int i = 0; i < arr.length; ++i) {sb.append(Integer.toHexString((arr[i] & 0xFF) | 0x100).substring(1, 3));}return sb.toString();}/*** MD5加密,并把结果由字节数组转换成十六进制字符串** @param str 要加密的内容* @return String 返回加密后的十六进制字符串*/private static String getMD5(String str) {try {MessageDigest md = MessageDigest.getInstance("MD5");byte[] digest = md.digest(str.getBytes("utf-8"));return hex(digest);} catch (Exception e) {e.printStackTrace();System.out.println(e.toString());return "";}}/*** MD5加密,并把结果由字节数组转换成十六进制字符串** @param str 要加密的内容* @return String 返回加密后的十六进制字符串*/public static String getMD5(String str, @NonNull @MD5Type String md5Type) {if (md5Type == MD5_32) {return getMD5(str);}return getMD5(str).substring(8, 24);}/*** 生成含有随机盐的密码** @param md5str 要加密的文本* @return String 含有随机盐的加密数据*/public static String getSaltMD5(String md5str) {// 生成一个16位的随机盐数Random random = new Random();StringBuilder sBuilder = new StringBuilder(16);sBuilder.append(random.nextInt(99999999)).append(random.nextInt(99999999));int len = sBuilder.length();if (len < 16) {for (int i = 0; i < 16 - len; i++) {sBuilder.append("0");}}// 生成最终的加密盐String salt = sBuilder.toString();md5str = getMD5(md5str + salt);char[] cs = new char[48];for (int i = 0; i < 48; i += 3) {cs[i] = md5str.charAt(i / 3 * 2);char c = salt.charAt(i / 3);cs[i + 1] = c;cs[i + 2] = md5str.charAt(i / 3 * 2 + 1);}return String.valueOf(cs);}/*** 验证加盐后是否和原密码一致** @param password 原密码* @param md5str 加密之后的密码* @return boolean true表示和原密码一致   false表示和原密码不一致*/public static boolean getSaltverifyMD5(String password, String md5str) {char[] cs1 = new char[32];char[] cs2 = new char[16];for (int i = 0; i < 48; i += 3) {cs1[i / 3 * 2] = md5str.charAt(i);cs1[i / 3 * 2 + 1] = md5str.charAt(i + 2);cs2[i / 3] = md5str.charAt(i + 1);}String salt = new String(cs2);return getMD5(password + salt).equals(String.valueOf(cs1));}}