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// Copyright 2020 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 prf
import (
"fmt"
"google.golang.org/protobuf/proto"
"github.com/tink-crypto/tink-go/v2/internal/tinkerror"
cmacpb "github.com/tink-crypto/tink-go/v2/proto/aes_cmac_prf_go_proto"
commonpb "github.com/tink-crypto/tink-go/v2/proto/common_go_proto"
hkdfpb "github.com/tink-crypto/tink-go/v2/proto/hkdf_prf_go_proto"
hmacpb "github.com/tink-crypto/tink-go/v2/proto/hmac_prf_go_proto"
tinkpb "github.com/tink-crypto/tink-go/v2/proto/tink_go_proto"
)
// This file contains pre-generated KeyTemplate for PRF.
// HMACSHA256PRFKeyTemplate is a KeyTemplate that generates an HMAC key with the following parameters:
// - Key size: 32 bytes
// - Hash function: SHA256
func HMACSHA256PRFKeyTemplate() *tinkpb.KeyTemplate {
return createHMACPRFKeyTemplate(32, commonpb.HashType_SHA256)
}
// HMACSHA512PRFKeyTemplate is a KeyTemplate that generates an HMAC key with the following parameters:
// - Key size: 64 bytes
// - Hash function: SHA512
func HMACSHA512PRFKeyTemplate() *tinkpb.KeyTemplate {
return createHMACPRFKeyTemplate(64, commonpb.HashType_SHA512)
}
// HKDFSHA256PRFKeyTemplate is a KeyTemplate that generates an HKDF key with the following parameters:
// - Key size: 32 bytes
// - Salt: empty
// - Hash function: SHA256
func HKDFSHA256PRFKeyTemplate() *tinkpb.KeyTemplate {
return createHKDFPRFKeyTemplate(32, commonpb.HashType_SHA256, make([]byte, 0))
}
// AESCMACPRFKeyTemplate is a KeyTemplate that generates a AES-CMAC key with the following parameters:
// - Key size: 32 bytes
func AESCMACPRFKeyTemplate() *tinkpb.KeyTemplate {
return createAESCMACPRFKeyTemplate(32)
}
// createHMACPRFKeyTemplate creates a new KeyTemplate for HMAC using the given parameters.
func createHMACPRFKeyTemplate(keySize uint32, hashType commonpb.HashType) *tinkpb.KeyTemplate {
params := hmacpb.HmacPrfParams{
Hash: hashType,
}
format := hmacpb.HmacPrfKeyFormat{
Params: ¶ms,
KeySize: keySize,
}
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.HmacPrfKey",
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
Value: serializedFormat,
}
}
// createHKDFPRFKeyTemplate creates a new KeyTemplate for HKDF using the given parameters.
func createHKDFPRFKeyTemplate(keySize uint32, hashType commonpb.HashType, salt []byte) *tinkpb.KeyTemplate {
params := hkdfpb.HkdfPrfParams{
Hash: hashType,
Salt: salt,
}
format := hkdfpb.HkdfPrfKeyFormat{
Params: ¶ms,
KeySize: keySize,
}
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.HkdfPrfKey",
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
Value: serializedFormat,
}
}
// createAESCMACPRFKeyTemplate creates a new KeyTemplate for AES-CMAC using the given parameters.
func createAESCMACPRFKeyTemplate(keySize uint32) *tinkpb.KeyTemplate {
format := cmacpb.AesCmacPrfKeyFormat{
KeySize: keySize,
}
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.AesCmacPrfKey",
OutputPrefixType: tinkpb.OutputPrefixType_RAW,
Value: serializedFormat,
}
}
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