加密系列 | SHA加密和解密算法详解代码示例

import java.security.MessageDigest;/*** 采用SHA加密* * @author peipei3514* @datetime -8-11 12:00:34*/public class SHAUtil {/**** SHA加密 生成40位SHA码*/public static String shaEncode(String data) throws Exception {MessageDigest sha = MessageDigest.getInstance("SHA");byte[] byteArray = data.getBytes("UTF-8");// md5Bytes的长度为20byte[] md5Bytes = sha.digest(byteArray);// 转换成16进制字符串StringBuffer hexValue = new StringBuffer();for (int i = 0; i < md5Bytes.length; i++) {int val = ((int) md5Bytes[i]) & 0xff;// 为了满足40位长度，当值小于16时需要先添加一位0(小于16的话用一位就能表示)if (val < 16) {hexValue.append("0");}hexValue.append(Integer.toHexString(val));}return hexValue.toString();}public static void main(String args[]) throws Exception {String str = new String("1A2B3C4D5E");System.out.println("原始：" + str);System.out.println("SHA后：" + shaEncode(str));}}