"github.com/minio/minio/internal/hash/sha256"
	"github.com/minio/minio/internal/logger"
	"github.com/minio/sio"
)

// ObjectKey is a 256 bit secret key used to encrypt the object.
// It must never be stored in plaintext.
type ObjectKey [32]byte

// GenerateKey generates a unique ObjectKey from a 256 bit external key
// and a source of randomness. If random is nil the default PRNG of the
// system (crypto/rand) is used.

import (
	"crypto/md5"
	"encoding/hex"

	"github.com/minio/minio/internal/hash/sha256"
)

// getSHA256Hash returns SHA-256 hash in hex encoding of given data.
func getSHA256Hash(data []byte) string {
	return hex.EncodeToString(getSHA256Sum(data))
}

// getSHA256Hash returns SHA-256 sum of given data.
func getSHA256Sum(data []byte) []byte {
	hash := sha256.New()
	hash.Write(data)
	return hash.Sum(nil)
}

	"github.com/minio/minio/internal/hash/sha256"
	"golang.org/x/crypto/blake2b"

	xioutil "github.com/minio/minio/internal/ioutil"
	"github.com/minio/minio/internal/logger"
)

// magic HH-256 key as HH-256 hash of the first 100 decimals of π as utf-8 string with a zero key.
var magicHighwayHash256Key = []byte("\x4b\xe7\x34\xfa\x8e\x23\x8a\xcd\x26\x3e\x83\xe6\xbb\x96\x85\x52\x04\x0f\x93\x5d\xa3\x9f\x44\x14\x97\xe0\x9d\x13\x22\xde\x36\xa0")

			want: map[string]uint64{
				"LESS_THAN_1024_B":         2,
				"BETWEEN_64_KB_AND_256_KB": 2,
				"BETWEEN_1024B_AND_1_MB":   2,
			},
		},
		{
			sizes: []int64{100, 1000, 2000, 100_000, 13 * humanize.MiByte},
			want: map[string]uint64{
				"LESS_THAN_1024_B":         2,
				"BETWEEN_1024_B_AND_64_KB": 1,
				"BETWEEN_64_KB_AND_256_KB": 1,
				"BETWEEN_1024B_AND_1_MB":   2,
				"BETWEEN_10_MB_AND_64_MB":  1,
			},
		},

	// Verify that CRC is ok.
	want := binary.LittleEndian.Uint32(id)
	got := crc32.ChecksumIEEE(key)
	if want != got {
		return fmt.Errorf("Invalid key checksum, want %x, got %x", want, got)
	}

	stream, err := sio.AES_256_GCM.Stream(key)
	if err != nil {
		return err
	}
	// Zero nonce, we only use each key once, and 32 bytes is plenty.
	nonce := make([]byte, stream.NonceSize())
	encr := stream.DecryptReader(r, nonce, nil)

		err = fmt.Errorf("bad ES version string: %s", version)
		return
	}

	switch {
	case majorVersion <= 6:
		res = ESSUnsupported
	default:
		res = ESSSupported
	}
	return
}

// magic HH-256 key as HH-256 hash of the first 100 decimals of π as utf-8 string with a zero key.

	{"BETWEEN_1024_B_AND_64_KB", humanize.KiByte, 64*humanize.KiByte - 1},         // not exported, for support use only
	{"BETWEEN_64_KB_AND_256_KB", 64 * humanize.KiByte, 256*humanize.KiByte - 1},   // not exported, for support use only
	{"BETWEEN_256_KB_AND_512_KB", 256 * humanize.KiByte, 512*humanize.KiByte - 1}, // not exported, for support use only

//
// The same context must be provided when decrypting the
// ciphertext.
func Encrypt(k kms.KMS, plaintext io.Reader, ctx kms.Context) (io.Reader, error) {
	algorithm := sio.AES_256_GCM
	if !fips.Enabled && !sioutil.NativeAES() {
		algorithm = sio.ChaCha20Poly1305
	}

	key, err := k.GenerateKey(context.Background(), "", ctx)
	if err != nil {
		return nil, err
	}

var _STSErrorCode_index = [...]uint16{0, 7, 22, 41, 65, 91, 118, 145, 171, 192, 219, 236, 256, 272, 288}

func (i STSErrorCode) String() string {
	if i < 0 || i >= STSErrorCode(len(_STSErrorCode_index)-1) {
		return "STSErrorCode(" + strconv.FormatInt(int64(i), 10) + ")"
	}

// because they have reached the end of their useful life.
// https://cs.opensource.google/go/x/crypto/+/refs/tags/v0.22.0:ssh/common.go;l=85
var supportedMACs = []string{
	"hmac-sha2-256******@****.***", "******@****.***", "hmac-sha2-256", "hmac-sha2-512", "hmac-sha1", "hmac-sha1-96",
}

func (s *sftpLogger) Error(tag xsftp.LogType, err error) {
	switch tag {
	case xsftp.AcceptNetworkError: