// length are validated.
	endPkgNum := (endOffset - cumulativeSum) / SSEDAREPackageBlockSize
	// Compute endEncOffset with one additional DARE package (so
	// we read the package containing the last desired byte).
	endEncOffset := encCumulativeSum + (endPkgNum+1)*sseDAREEncPackageBlockSize
	// Check if the DARE package containing the end offset is a
	// full sized package (as the last package in the part may be
	// smaller)

		var decRangeLength int64
		decRangeLength, err = rs.GetLength(decSize)
		if err != nil {
			return nil, 0, 0, err
		}

		// We define a closure that performs decryption given
		// a reader that returns the desired range of
		// encrypted bytes. The header parameter is used to
		// provide encryption parameters.
		fn = func(inputReader io.Reader, h http.Header, cFns ...func()) (r *GetObjectReader, err error) {

	// map of config parameter name to EnvPair.
	EnvMap map[string]EnvPair
}

// GetSubsysInfo returns `SubsysInfo`s for all targets for the subsystem, when
// target is empty. Otherwise returns `SubsysInfo` for the desired target only.
// To request the default target only, target must be set to `Default`.
func (c Config) GetSubsysInfo(subSys, target string, redactSecrets bool) ([]SubsysInfo, error) {
	// Check if config param requested is valid.