checkNotDestroyed();

        if (ciphertext == null || ciphertext.length <= GCM_IV_SIZE) {
            return null;
        }

        // Extract IV and ciphertext
        byte[] iv = new byte[GCM_IV_SIZE];
        System.arraycopy(ciphertext, 0, iv, 0, GCM_IV_SIZE);

        byte[] encryptedData = new byte[ciphertext.length - GCM_IV_SIZE];

// sumHMAC calculate hmac between two input byte array.
func sumHMAC(key []byte, data []byte) []byte {
	hash := hmac.New(sha256.New, key)
	hash.Write(data)
	return hash.Sum(nil)
}

// extractSignedHeaders extract signed headers from Authorization header
func extractSignedHeaders(signedHeaders []string, r *http.Request) (http.Header, APIErrorCode) {
	reqHeaders := r.Header
	reqQueries := r.Form

				"X-Amz-Content-Sha256": payloadSHA256,
			},
			region:   "us-west-1",
			expected: ErrUnsignedHeaders,
		},
		// (3) Should fail to extract headers if the host header is not signed.
		{
			queryParams: map[string]string{
				"X-Amz-Algorithm":      signV4Algorithm,
				"X-Amz-Date":           now.Format(iso8601Format),
				"X-Amz-Expires":        "60",

// KMS data key. Otherwise, it returns an error.
func (ssekms) ParseMetadata(metadata map[string]string) (keyID string, kmsKey []byte, sealedKey SealedKey, ctx kms.Context, err error) {
	// Extract all required values from object metadata
	b64IV, ok := metadata[MetaIV]
	if !ok {
		return keyID, kmsKey, sealedKey, ctx, errMissingInternalIV
	}
	algorithm, ok := metadata[MetaAlgorithm]
	if !ok {

  static Class<?> getArrayClass(Class<?> componentType) {
    // TODO(user): This is not the most efficient way to handle generic
    // arrays, but is there another way to extract the array class in a
    // non-hacky way (i.e. using String value class names- "[L...")?
    return Array.newInstance(componentType, 0).getClass();
  }

  /*

        }
    }

    /**
     * Attempts to obtain login credentials using SPNEGO authentication.
     *
     * This method processes the HTTP request to extract and validate SPNEGO
     * authentication tokens. It handles the SPNEGO handshake process and
     * extracts the user principal from successful authentication.
     *

        return encodingStream(encodedSink.openStream());
      }
    };
  }

  // TODO(lowasser): document the extent of leniency, probably after adding ignore(CharMatcher)

  private static byte[] extract(byte[] result, int length) {
    if (length == result.length) {
      return result;
    }
    byte[] trunc = new byte[length];
    System.arraycopy(result, 0, trunc, 0, length);
    return trunc;
  }

		accessKey       string
		err             error
	)

	var unescapedQueries []string
	unescapedQueries, err = unescapeQueries(encodedQuery)
	if err != nil {
		return ErrInvalidQueryParams
	}

	// Extract the necessary values from presigned query, construct a list of new filtered queries.
	for _, query := range unescapedQueries {
		keyval := strings.SplitN(query, "=", 2)
		if len(keyval) != 2 {
			return ErrInvalidQueryParams

dc:title=title:string\n\

# html

# XPath to extract main content from HTML documents.
crawler.document.html.content.xpath=//BODY
# XPath to extract language attribute from HTML documents.
crawler.document.html.lang.xpath=//HTML/@lang
# XPath to extract digest (description) from HTML documents.
crawler.document.html.digest.xpath=//META[@name='description']/@content
# XPath to extract canonical URL from HTML documents.

	users := set.NewStringSet()
	for _, kv := range kvs {
		user := extractPathPrefixAndSuffix(string(kv.Key), prefix, path.Base(string(kv.Key)))
		users.Add(user)
	}
	return users
}

// Extract path string by stripping off the `prefix` value and the suffix,
// value, usually in the following form.
//
//	s := "config/iam/users/foo/config.json"
//	prefix := "config/iam/users/"
//	suffix := "config.json"