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SHA安全加密标准,是至今世界上使用最广泛且安全的压缩算法之一,随着密码学研究的不断深入和计算机技术的快速发展,SHA-256算法得到全面推广应用。
java代码实现:
package com.caojiulu;import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;public class Main { public static void main(String[] args) { } 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; } 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(); } public static String encodeBySHA256(String str) { if (str == null) { return null; } try { MessageDigest messageDigest = MessageDigest.getInstance("SHA-256"); messageDigest.reset(); messageDigest.update(str.getBytes()); return getFormattedText(messageDigest.digest()); } catch (Exception e) { return ""; } } private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; private static String getFormattedText(byte[] bytes) { int len = bytes.length; StringBuilder buf = new StringBuilder(len * 2); // 把密文转换成十六进制的字符串形式 for (int j = 0; j < len; j++) { buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]); buf.append(HEX_DIGITS[bytes[j] & 0x0f]); } return buf.toString(); }}
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