fs.Spec.Rules = append(fs.Spec.Rules, rule)
		ftr.addDigests(ruleMatchingRDigests, true)
		ftr.addDigests(ruleMatchingNDigests, true)
		ftr.addDigests(ruleSkippingRDigests, false)
		ftr.addDigests(ruleSkippingNDigests, false)
	}
	if nRules == 0 {
		var skippingRDigests, skippingNDigests []RequestDigest

	return "Bad sha256: Expected " + e.ExpectedSHA256 + " does not match calculated " + e.CalculatedSHA256
}

// BadDigest - Content-MD5 you specified did not match what we received.
type BadDigest struct {
	ExpectedMD5   string
	CalculatedMD5 string
}

func (e BadDigest) Error() string {
	return "Bad digest: Expected " + e.ExpectedMD5 + " does not match calculated " + e.CalculatedMD5
}

func newReader(ctx context.Context, src io.Reader, size int64, md5Hex, sha256Hex string, actualSize int64, disableMD5 bool, forceMD5 []byte) (*Reader, error) {
	MD5, err := hex.DecodeString(md5Hex)
	if err != nil {
		return nil, BadDigest{ // TODO(aead): Return an error that indicates that an invalid ETag has been specified
			ExpectedMD5:   md5Hex,
			CalculatedMD5: "",
		}
	}
	SHA256, err := hex.DecodeString(sha256Hex)
	if err != nil {

			actualSize: 4,
		},
		{
			desc:       "Failure md5 mismatch.",
			src:        bytes.NewReader([]byte("abcd")),
			size:       4,
			actualSize: 4,
			md5hex:     "d41d8cd98f00b204e9800998ecf8427f",
			err: BadDigest{
				"d41d8cd98f00b204e9800998ecf8427f",
				"e2fc714c4727ee9395f324cd2e7f331f",
			},
		},
		{
			desc:       "Failure sha256 mismatch.",
			src:        bytes.NewReader([]byte("abcd")),
			size:       4,

			expectedError: hash.BadDigest{ExpectedMD5: invalidMD5, CalculatedMD5: getMD5Hash(data)},
		},
		24: {
			bucketName: bucket, objName: object, inputData: nilBytes, inputMeta: invalidMD5Header, inputDataSize: int64(len(nilBytes)), expectedMd5: getMD5Hash(nilBytes),
			expectedError: hash.BadDigest{ExpectedMD5: invalidMD5, CalculatedMD5: getMD5Hash(nilBytes)},
		},
		25: {

	"errors"
	"testing"

	"github.com/minio/minio/internal/crypto"
	"github.com/minio/minio/internal/hash"
)

var toAPIErrorTests = []struct {
	err     error
	errCode APIErrorCode
}{
	{err: hash.BadDigest{}, errCode: ErrBadDigest},
	{err: hash.SHA256Mismatch{}, errCode: ErrContentSHA256Mismatch},
	{err: IncompleteBody{}, errCode: ErrIncompleteBody},
	{err: ObjectExistsAsDirectory{}, errCode: ErrObjectExistsAsDirectory},

	},
	ErrAccessDenied: {
		Code:           "AccessDenied",
		Description:    "Access Denied.",
		HTTPStatusCode: http.StatusForbidden,
	},
	ErrBadDigest: {
		Code:           "BadDigest",
		Description:    "The Content-Md5 you specified did not match what we received.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrEntityTooSmall: {
		Code:           "EntityTooSmall",

		// Test case - 12.
		// Input to replicate Md5 mismatch.
		{
			bucketName: bucket, objName: object, uploadID: uploadID, PartID: 1, inputMd5: "d41d8cd98f00b204e9800998ecf8427f",
			expectedError: hash.BadDigest{ExpectedMD5: "d41d8cd98f00b204e9800998ecf8427f", CalculatedMD5: "d41d8cd98f00b204e9800998ecf8427e"},
		},
		// Test case - 13.
		// When incorrect sha256 is provided.
		{