HmacSHA1加密算法

    public static String getSignature(String data,String key) throws Exception{
        final String ALGORITHM = "HmacSHA1";
        final String ENCODING = "UTF-8";
        key = "testsecret&";
        Mac mac = Mac.getInstance(ALGORITHM);
        mac.init(new SecretKeySpec(key.getBytes(ENCODING), ALGORITHM));
        byte[] signData = mac.doFinal(data.getBytes(ENCODING));
        String signature = new String(Base64.encodeBase64(signData));
        return signature;
    }

参数：

GET&%2F&AccessKeyId%3Dtestid&Action%3DDescribeRegions&Format%3DXML&SignatureMethod%3DHMAC-SHA1&SignatureNonce%3D3ee8c1b8-83d3-44af-a94f-4e0ad82fd6cf&SignatureVersion%3D1.0&TimeStamp%3D2016-02-23T12%253A46%253A24Z&Version%3D2014-05-26

testsecret&
结果：CT9X0VtwR86fNWSnsc6v8YGOjuE=