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reid_fpe.go
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reid_fpe.go
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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
//
// https://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 deid
// [START dlp_reidentify_fpe]
import (
"context"
"encoding/base64"
"fmt"
"io"
dlp "cloud.google.com/go/dlp/apiv2"
"cloud.google.com/go/dlp/apiv2/dlppb"
)
// reidentifyFPE reidentifies the input with FPE (Format Preserving Encryption).
// keyFileName is the file name with the KMS wrapped key and cryptoKeyName is the
// full KMS key resource name used to wrap the key. surrogateInfoType is an
// the identifier used during deidentification.
// Info types can be found with the infoTypes.list method or on https://cloud.google.com/dlp/docs/infotypes-reference
func reidentifyFPE(w io.Writer, projectID, input, kmsKeyName, wrappedAesKey, surrogateInfoType string) error {
// projectID := "my-project-id"
// input := "My SSN is 123456789"
// keyFileName := "projects/YOUR_GCLOUD_PROJECT/locations/YOUR_LOCATION/keyRings/YOUR_KEYRING_NAME/cryptoKeys/YOUR_KEY_NAME"
// cryptoKeyName := "YOUR_ENCRYPTED_AES_256_KEY"
// surrogateInfoType := "AGE"
ctx := context.Background()
client, err := dlp.NewClient(ctx)
if err != nil {
return fmt.Errorf("dlp.NewClient: %w", err)
}
defer client.Close()
// Specify an encrypted AES-256 key and the name of the Cloud KMS key that encrypted it.
kmsWrappedCryptoKey, err := base64.StdEncoding.DecodeString(wrappedAesKey)
if err != nil {
fmt.Fprintf(w, "error %v", err)
return err
}
// Specify the crypto key configuration that will used for encryption.
cryptoKey := &dlppb.CryptoKey{
Source: &dlppb.CryptoKey_KmsWrapped{
KmsWrapped: &dlppb.KmsWrappedCryptoKey{
WrappedKey: kmsWrappedCryptoKey,
CryptoKeyName: kmsKeyName,
},
},
}
// Create a configured request.
req := &dlppb.ReidentifyContentRequest{
Parent: fmt.Sprintf("projects/%s/locations/global", projectID),
ReidentifyConfig: &dlppb.DeidentifyConfig{
Transformation: &dlppb.DeidentifyConfig_InfoTypeTransformations{
InfoTypeTransformations: &dlppb.InfoTypeTransformations{
Transformations: []*dlppb.InfoTypeTransformations_InfoTypeTransformation{
{
InfoTypes: []*dlppb.InfoType{},
PrimitiveTransformation: &dlppb.PrimitiveTransformation{
Transformation: &dlppb.PrimitiveTransformation_CryptoReplaceFfxFpeConfig{
CryptoReplaceFfxFpeConfig: &dlppb.CryptoReplaceFfxFpeConfig{
CryptoKey: cryptoKey,
// Set the alphabet used for the encrypted fields.
Alphabet: &dlppb.CryptoReplaceFfxFpeConfig_CommonAlphabet{
CommonAlphabet: dlppb.CryptoReplaceFfxFpeConfig_ALPHA_NUMERIC,
},
// Set the surrogate info type used during deidentification.
SurrogateInfoType: &dlppb.InfoType{
Name: surrogateInfoType,
},
},
},
},
},
},
},
},
},
// The InspectConfig must identify the surrogate info type to reidentify.
InspectConfig: &dlppb.InspectConfig{
CustomInfoTypes: []*dlppb.CustomInfoType{
{
InfoType: &dlppb.InfoType{
Name: surrogateInfoType,
},
Type: &dlppb.CustomInfoType_SurrogateType_{
SurrogateType: &dlppb.CustomInfoType_SurrogateType{},
},
},
},
},
// The item to analyze.
Item: &dlppb.ContentItem{
DataItem: &dlppb.ContentItem_Value{
Value: input,
},
},
}
// Send the request.
r, err := client.ReidentifyContent(ctx, req)
if err != nil {
return fmt.Errorf("ReidentifyContent: %w", err)
}
// Print the result.
fmt.Fprint(w, r.GetItem().GetValue())
return nil
}
// [END dlp_reidentify_fpe]