package com.jilongda.optometry.wx.utils;
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import java.security.MessageDigest;
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public class SHA1 {
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/**
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* 用SHA1算法生成安全签名
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*
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* @param str
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* @return
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* @throws WxException
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*/
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public static String getSHA1(String str) throws WxException {
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try {
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// SHA1签名生成
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MessageDigest md = MessageDigest.getInstance("SHA-1");
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md.update(str.getBytes());
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byte[] digest = md.digest();
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StringBuffer hexstr = new StringBuffer();
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String shaHex;
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for (int i = 0; i < digest.length; i++) {
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shaHex = Integer.toHexString(digest[i] & 0xFF);
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if (shaHex.length() < 2) {
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hexstr.append(0);
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}
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hexstr.append(shaHex);
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}
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return hexstr.toString();
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} catch (Exception e) {
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throw new WxException(WxException.ComputeSignatureError);
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}
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}
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}
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