Java实现SHA256算法
本文实例讲述了Java SHA-256加密的两种实现方法。分享给大家供大家参考,具体如下:
1、利用Apache的工具类实现加密:
maven:
<dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>${common-codec.version}</version> </dependency>
实现代码:
/*** * 利用Apache的工具类实现SHA-256加密 * @param str 加密后的报文 * @return
*/ public static String getSHA256Str(String str){ MessageDigest messageDigest; String encdeStr = ""; try { messageDigest = MessageDigest.getInstance("SHA-256"); byte[] hash = messageDigest.digest(str.getBytes("UTF-8")); encdeStr = Hex.encodeHexString(hash); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return encdeStr; }
2、利用Java自带的实现加密:
/** * 利用java原生的摘要实现SHA256加密 * @param str 加密后的报文 * @return
* import java.io.UnsupportedEncodingException;
* import java.security.MessageDigest;
* import java.security.NoSuchAlgorithmException;
*/ public static String getSHA256StrJava(String str){ MessageDigest messageDigest; String encodeStr = ""; try { messageDigest = MessageDigest.getInstance("SHA-256"); messageDigest.update(str.getBytes("UTF-8")); encodeStr = byte2Hex(messageDigest.digest()); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return encodeStr; } /** * 将byte转为16进制 * @param bytes * @return */ private static String byte2Hex(byte[] bytes){ StringBuffer stringBuffer = new StringBuffer(); String temp = null; for (int i=0;i<bytes.length;i++){ temp = Integer.toHexString(bytes[i] & 0xFF); if (temp.length()==1){ //1得到一位的进行补0操作 stringBuffer.append("0"); } stringBuffer.append(temp); } return stringBuffer.toString(); }