// added it. However, when decrypting an object the bucket/object name must
	// be part of the object. Therefore, the bucket/object name must be added
	// to the context, if not present, whenever a decryption is performed.
	MetaContext = "X-Minio-Internal-Server-Side-Encryption-Context"

	// ARNPrefix prefix for "arn:aws:kms"
	ARNPrefix = "arn:aws:kms:"
)

// IsMultiPart returns true if the object metadata indicates

//     before calling Format.
//     S3 clients expect that the ETag of an SSE-S3 encrypted
//     single-part object is equal to the object's content MD5.
//     Formatting the SSE-S3 ETag before decryption will result
//     in a random-looking ETag which an S3 client will not accept.
//
// Hence, a caller has to check:
//
//	if method == SSE-S3 {
//	   ETag, err := Decrypt(key, ETag)
//	   if err != nil {

	decryptedKey, err := GlobalKMS.DecryptKey(key.KeyID, key.Ciphertext, kmsContext)
	switch {
	case err != nil:
		kmsStat.Decrypt = fmt.Sprintf("Decryption failed: %v", err)
	case subtle.ConstantTimeCompare(key.Plaintext, decryptedKey) != 1:
		kmsStat.Decrypt = "Decryption failed: decrypted key does not match generated key"
	default:
		kmsStat.Decrypt = "success"
	}
	return kmsStat
}