)

const (
	// AES256 is used with SSE-S3
	AES256 Algorithm = "AES256"
	// AWSKms is used with SSE-KMS
	AWSKms Algorithm = "aws:kms"
)

// Algorithm - represents valid SSE algorithms supported; currently only AES256 is supported
type Algorithm string

// UnmarshalXML - Unmarshals XML tag to valid SSE algorithm
func (alg *Algorithm) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
	var s string

	}
	for algorithm := range bitrotAlgorithms {
		if !algorithm.Available() {
			continue
		}

		checksum, err := hex.DecodeString(checksums[algorithm])
		if err != nil {
			logger.Fatal(errSelfTestFailure, fmt.Sprintf("bitrot: failed to decode %v checksum %s for selftest: %v", algorithm, checksums[algorithm], err))
		}
		var (
			hash = algorithm.New()

		}
	}
	iv, err := sioutil.Random(16)
	if err != nil {
		return DEK{}, err
	}

	var algorithm string
	if sioutil.NativeAES() {
		algorithm = algorithmAESGCM
	} else {
		algorithm = algorithmChaCha20Poly1305
	}

	var aead cipher.AEAD
	switch algorithm {
	case algorithmAESGCM:
		mac := hmac.New(sha256.New, kms.key)
		mac.Write(iv)
		sealingKey := mac.Sum(nil)

	if tillOffset > shardFileSize {
		tillOffset = shardFileSize
	}
	return tillOffset
}

// erasureSelfTest performs a self-test to ensure that erasure
// algorithms compute expected erasure codes. If any algorithm
// produces an incorrect value it fails with a hard error.
//
// erasureSelfTest tries to catch any issue in the erasure implementation
// early instead of silently corrupting data.

			"X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm": "DAREv2-HMAC-SHA256",
			"X-Minio-Internal-Server-Side-Encryption-Iv":             "coVfGS3I/CTrqexX5vUN+PQPoP9aUFiPYYrSzqTWfBA=",
		},
		ExpectedErr: nil,
	},
	{ // 1 - Valid HTTP headers but invalid metadata entries for bucket/object2
		Headers: http.Header{
			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},

func (key *ObjectKey) Unseal(extKey []byte, sealedKey SealedKey, domain, bucket, object string) error {
	var unsealConfig sio.Config
	switch sealedKey.Algorithm {
	default:
		return Errorf("The sealing algorithm '%s' is not supported", sealedKey.Algorithm)
	case SealAlgorithm:
		mac := hmac.New(sha256.New, extKey)
		mac.Write(sealedKey.IV[:])
		mac.Write([]byte(domain))
		mac.Write([]byte(SealAlgorithm))

		Metadata:         nil,
		Parts:            nil,
		Erasure: ErasureInfo{
			Algorithm:    ReedSolomon.String(),
			DataBlocks:   4,
			ParityBlocks: 2,
			BlockSize:    10000,
			Index:        1,
			Distribution: []int{1, 2, 3, 4, 5, 6, 7, 8},
			Checksums: []ChecksumInfo{{
				PartNumber: 1,
				Algorithm:  HighwayHash256S,
				Hash:       nil,
			}},
		},
		MarkDeleted:      false,

#include <Security/Security.h>
#if TARGET_OS_IPHONE == 0 && __MAC_OS_X_VERSION_MAX_ALLOWED < 101200
  typedef CFStringRef SecKeyAlgorithm;
  static CFDataRef SecKeyCreateSignature(SecKeyRef key, SecKeyAlgorithm algorithm, CFDataRef dataToSign, CFErrorRef *error){return NULL;}
  #define kSecKeyAlgorithmECDSASignatureDigestX962SHA1 foo()
  static SecKeyAlgorithm foo(void){return NULL;}
#endif
*/
import "C"
import (
	"fmt"

		return nil, err
	}
	if fips.Enabled && metadata.Algorithm != sio.AES_256_GCM {
		return nil, fmt.Errorf("config: unsupported encryption algorithm: %q is not supported in FIPS mode", metadata.Algorithm)
	}

	key, err := k.DecryptKey(metadata.KeyID, metadata.KMSKey, context)
	if err != nil {
		return nil, err
	}
	stream, err := metadata.Algorithm.Stream(key)
	if err != nil {
		return nil, err
	}

func (ssekms) CreateMetadata(metadata map[string]string, keyID string, kmsKey []byte, sealedKey SealedKey, ctx kms.Context) map[string]string {
	if sealedKey.Algorithm != SealAlgorithm {
		logger.CriticalIf(context.Background(), Errorf("The seal algorithm '%s' is invalid for SSE-S3", sealedKey.Algorithm))
	}

	// There are two possibilities:
	// - We use a KMS -> There must be non-empty key ID and a KMS data key.