java实现sha1

输入字符串使用原生sha1加密

String original = "this is plaintext";
String mySignature;
        try {
            MessageDigest md = MessageDigest.getInstance("SHA1");
            md.update(original.getBytes());
            byte[] digest = md.digest();

            StringBuffer hexstr = new StringBuffer();
            String shaHex = "";
            for (int i = 0; i < digest.length; i++) {
                shaHex = Integer.toHexString(digest[i] & 0xFF);
                if (shaHex.length() < 2) {
                    hexstr.append(0);
                }
                hexstr.append(shaHex);
            }

            mySignature = hexstr.toString();
        } catch (NoSuchAlgorithmException e) {
            return "签名验证错误";
        }