}

	tag := ciphertext[len(ciphertext)-g.tagSize:]
	ciphertext = ciphertext[:len(ciphertext)-g.tagSize]

	var counter, tagMask [gcmBlockSize]byte
	g.deriveCounter(&counter, nonce)

	g.cipher.Encrypt(tagMask[:], counter[:])
	gcmInc32(&counter)

	var expectedTag [gcmTagSize]byte
	g.auth(expectedTag[:], ciphertext, data, &tagMask)

	ret, out := sliceForAppend(dst, len(ciphertext))

					}

					expectedCiphertext := mustDecodeHex(t, enc["ct"])
					ciphertext, err := context.Seal(mustDecodeHex(t, enc["aad"]), mustDecodeHex(t, enc["pt"]))
					if err != nil {
						t.Fatal(err)
					}
					if !bytes.Equal(ciphertext, expectedCiphertext) {
						t.Errorf("unexpected ciphertext: got %x want %x", ciphertext, expectedCiphertext)
					}
				})
			}
		})
	}

		panic("message limit reached")
	}
	s.seqNum = s.seqNum.addOne()
	return nonce
}

func (s *Sender) Seal(aad, plaintext []byte) ([]byte, error) {

	ciphertext := s.aead.Seal(nil, s.nextNonce(), plaintext, aad)
	return ciphertext, nil
}

func SuiteID(kemID, kdfID, aeadID uint16) []byte {
	suiteID := make([]byte, 0, 4+2+2+2)
	suiteID = append(suiteID, []byte("HPKE")...)

		return
	}

	// 2. Verify that we can indeed decrypt the (encrypted) key
	decryptedKey, err := GlobalKMS.Decrypt(ctx, &kms.DecryptRequest{
		Name:           key.KeyID,
		Ciphertext:     key.Ciphertext,
		AssociatedData: kmsContext,
	})
	if err != nil {
		response.DecryptionErr = err.Error()
		resp, err := json.Marshal(response)
		if err != nil {