src/main/java/com/alibaba/cloudapi/sdk/signature/HMacSHA1SignerFactory.java [35:43]:
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        @Override
        public String sign(String strToSign, String secretKey) throws NoSuchAlgorithmException, InvalidKeyException  , SdkException {

            if (HttpCommonUtil.isEmpty(strToSign)) {
                throw new IllegalArgumentException("strToSign can not be empty");
            }

            if (HttpCommonUtil.isEmpty(secretKey)) {
                throw new IllegalArgumentException("secretKey can not be empty");
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src/main/java/com/alibaba/cloudapi/sdk/signature/HMacSHA256SignerFactory.java [32:40]:
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        @Override
        public String sign(String strToSign, String secretKey) throws NoSuchAlgorithmException, InvalidKeyException  , SdkException {

            if (HttpCommonUtil.isEmpty(strToSign)) {
                throw new IllegalArgumentException("strToSign can not be empty");
            }

            if (HttpCommonUtil.isEmpty(secretKey)) {
                throw new IllegalArgumentException("secretKey can not be empty");
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