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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package hybrid
import (
"fmt"
"google.golang.org/protobuf/proto"
"github.com/tink-crypto/tink-go/v2/aead"
"github.com/tink-crypto/tink-go/v2/internal/tinkerror"
commonpb "github.com/tink-crypto/tink-go/v2/proto/common_go_proto"
eciespb "github.com/tink-crypto/tink-go/v2/proto/ecies_aead_hkdf_go_proto"
hpkepb "github.com/tink-crypto/tink-go/v2/proto/hpke_go_proto"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
// This file contains pre-generated KeyTemplates for HybridEncrypt keys. One
// can use these templates to generate new Keysets.
// DHKEM_P256_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Key_Template creates a HPKE
// key template with:
// - KEM: DHKEM_P256_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: AES_128_GCM.
//
// It adds the 5-byte Tink prefix to ciphertexts.
func DHKEM_P256_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_P256_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_AES_128_GCM,
tinkpb.OutputPrefixType_TINK,
)
}
// DHKEM_P256_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Raw_Key_Template creates a
// HPKE key template with:
// - KEM: DHKEM_P256_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: AES_128_GCM.
//
// It does not add a prefix to ciphertexts.
func DHKEM_P256_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Raw_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_P256_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_AES_128_GCM,
tinkpb.OutputPrefixType_RAW,
)
}
// DHKEM_P256_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Key_Template creates a HPKE
// key template with:
// - KEM: DHKEM_P256_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: AES_256_GCM.
//
// It adds the 5-byte Tink prefix to ciphertexts.
func DHKEM_P256_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_P256_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_AES_256_GCM,
tinkpb.OutputPrefixType_TINK,
)
}
// DHKEM_P256_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Raw_Key_Template creates a
// HPKE key template with:
// - KEM: DHKEM_P256_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: AES_256_GCM.
//
// It does not add a prefix to ciphertexts.
func DHKEM_P256_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Raw_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_P256_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_AES_256_GCM,
tinkpb.OutputPrefixType_RAW,
)
}
// DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Key_Template creates a HPKE
// key template with:
// - KEM: DHKEM_X25519_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: AES_128_GCM.
//
// It adds the 5-byte Tink prefix to ciphertexts.
func DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_AES_128_GCM,
tinkpb.OutputPrefixType_TINK,
)
}
// DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Raw_Key_Template creates a
// HPKE key template with:
// - KEM: DHKEM_X25519_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: AES_128_GCM.
//
// It does not add a prefix to ciphertexts.
func DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_128_GCM_Raw_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_AES_128_GCM,
tinkpb.OutputPrefixType_RAW,
)
}
// DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Key_Template creates a HPKE
// key template with:
// - KEM: DHKEM_X25519_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: AES_256_GCM.
//
// It adds the 5-byte Tink prefix to ciphertexts.
func DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_AES_256_GCM,
tinkpb.OutputPrefixType_TINK,
)
}
// DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Raw_Key_Template creates a
// HPKE key template with:
// - KEM: DHKEM_X25519_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: AES_256_GCM.
//
// It does not add a prefix to ciphertexts.
func DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_AES_256_GCM_Raw_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_AES_256_GCM,
tinkpb.OutputPrefixType_RAW,
)
}
// DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_CHACHA20_POLY1305_Key_Template creates
// a HPKE key template with:
// - KEM: DHKEM_X25519_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: CHACHA20_POLY1305.
//
// It adds the 5-byte Tink prefix to ciphertexts.
func DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_CHACHA20_POLY1305_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_CHACHA20_POLY1305,
tinkpb.OutputPrefixType_TINK,
)
}
// DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_CHACHA20_POLY1305_Raw_Key_Template creates
// a HPKE key template with:
// - KEM: DHKEM_X25519_HKDF_SHA256,
// - KDF: HKDF_SHA256, and
// - AEAD: CHACHA20_POLY1305.
//
// It does not add a prefix to ciphertexts.
func DHKEM_X25519_HKDF_SHA256_HKDF_SHA256_CHACHA20_POLY1305_Raw_Key_Template() *tinkpb.KeyTemplate {
return createHPKEKeyTemplate(
hpkepb.HpkeKem_DHKEM_X25519_HKDF_SHA256,
hpkepb.HpkeKdf_HKDF_SHA256,
hpkepb.HpkeAead_CHACHA20_POLY1305,
tinkpb.OutputPrefixType_RAW,
)
}
// createHPKEKeyTemplate creates a new HPKE key template with the given
// parameters.
func createHPKEKeyTemplate(kem hpkepb.HpkeKem, kdf hpkepb.HpkeKdf, aead hpkepb.HpkeAead, outputPrefixType tinkpb.OutputPrefixType) *tinkpb.KeyTemplate {
format := &hpkepb.HpkeKeyFormat{
Params: &hpkepb.HpkeParams{
Kem: kem,
Kdf: kdf,
Aead: aead,
},
}
serializedFormat, err := proto.Marshal(format)
if err != nil {
tinkerror.Fail(fmt.Sprintf("failed to marshal key format: %s", err))
}
return &tinkpb.KeyTemplate{
TypeUrl: "type.googleapis.com/google.crypto.tink.HpkePrivateKey",
Value: serializedFormat,
OutputPrefixType: outputPrefixType,
}
}
// ECIESHKDFAES128GCMKeyTemplate creates an ECIES-AEAD-HKDF key template with:
// - KEM: ECDH over NIST P-256
// - DEM: AES128-GCM
// - KDF: HKDF-HMAC-SHA256 with an empty salt
func ECIESHKDFAES128GCMKeyTemplate() *tinkpb.KeyTemplate {
salt := []byte{}
return createECIESAEADHKDFKeyTemplate(commonpb.EllipticCurveType_NIST_P256, commonpb.HashType_SHA256, commonpb.EcPointFormat_UNCOMPRESSED, aead.AES128GCMKeyTemplate(), salt)
}
// ECIESHKDFAES128CTRHMACSHA256KeyTemplate creates an ECIES-AEAD-HKDF key
// template with:
// - KEM: ECDH over NIST P-256
// - DEM: AES128-CTR-HMAC-SHA256
// - KDF: HKDF-HMAC-SHA256 with an empty salt
//
// The DEM parameters are:
// - AES key size: 16 bytes
// - AES CTR IV size: 16 bytes
// - HMAC key size: 32 bytes
// - HMAC tag size: 16 bytes
func ECIESHKDFAES128CTRHMACSHA256KeyTemplate() *tinkpb.KeyTemplate {
salt := []byte{}
return createECIESAEADHKDFKeyTemplate(commonpb.EllipticCurveType_NIST_P256, commonpb.HashType_SHA256, commonpb.EcPointFormat_UNCOMPRESSED, aead.AES128CTRHMACSHA256KeyTemplate(), salt)
}
// createEciesAEADHKDFKeyTemplate creates a new ECIES-AEAD-HKDF key template
// with the given parameters.
func createECIESAEADHKDFKeyTemplate(c commonpb.EllipticCurveType, ht commonpb.HashType, ptfmt commonpb.EcPointFormat, dekT *tinkpb.KeyTemplate, salt []byte) *tinkpb.KeyTemplate {
format := &eciespb.EciesAeadHkdfKeyFormat{
Params: &eciespb.EciesAeadHkdfParams{
KemParams: &eciespb.EciesHkdfKemParams{
CurveType: c,
HkdfHashType: ht,
HkdfSalt: salt,
},
DemParams: &eciespb.EciesAeadDemParams{
AeadDem: dekT,
},
EcPointFormat: ptfmt,
},
}
serializedFormat, err := proto.Marshal(format)
if err != nil {
tinkerror.Fail(fmt.Sprintf("failed to marshal key format: %s", err))
}
return &tinkpb.KeyTemplate{
TypeUrl: "type.googleapis.com/google.crypto.tink.EciesAeadHkdfPrivateKey",
Value: serializedFormat,
OutputPrefixType: tinkpb.OutputPrefixType_TINK,
}
}
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