// Skip invalid cases where SHA1 or SHA256 is used with full object
			if (tt.checksum.Is(ChecksumSHA1) || tt.checksum.Is(ChecksumSHA256)) && tt.fullobj {
				// Validate that NewChecksumType correctly marks these as invalid
				alg := tt.checksum.String()
				typ := NewChecksumType(alg, xhttp.AmzChecksumTypeFullObject)
				if !typ.Is(ChecksumInvalid) {
					t.Fatalf("Expected ChecksumInvalid for %s with full object, got %s", tt.name, typ.StringFull())
				}

		// AWS seems to ignore full value, and just assume it.
		return ChecksumCRC64NVME
	case "":
		return ChecksumNone
	}
	return ChecksumInvalid
}

// NewChecksumType returns a checksum type based on the algorithm string and obj type.
func NewChecksumType(alg, objType string) ChecksumType {
	full := ChecksumFullObject
	switch objType {
	case xhttp.AmzChecksumTypeFullObject:
	case xhttp.AmzChecksumTypeComposite, "":

	}

	// Checksum type set when upload started.
	var checksumType hash.ChecksumType
	if cs := fi.Metadata[hash.MinIOMultipartChecksum]; cs != "" {
		checksumType = hash.NewChecksumType(cs, fi.Metadata[hash.MinIOMultipartChecksumType])
		if opts.WantChecksum != nil && !opts.WantChecksum.Type.Is(checksumType) {
			return oi, InvalidArgument{
				Bucket: bucket,
				Object: fi.Name,