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main.go
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main.go
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// Copyright © 2024 Apple Inc. All rights reserved.
//
// 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 main
import (
"context"
"crypto/rand"
"crypto/rsa"
"encoding/base64"
"github.com/areese/piv-go/example/shared"
"github.com/areese/piv-go/piv"
)
func main() {
}
//nolint:deadcode
func Encrypt(fileName string, logger shared.LogI) error {
ctx := context.Background()
pgpConfig := shared.Config{
CardSelection: nil,
Debug: false,
Verbose: false,
Trace: false,
Quiet: false,
ShowPublic: false,
Base64Encoded: false,
}
// do the general setup
yubikeyClient, fileBytes, err := pgpConfig.DevEncryptDecryptSetup(ctx, logger, "encrypt", fileName)
defer func() { yubikeyClient.Close(ctx, logger) }()
if err != nil {
return err
}
// we have file bytes, now we can encrypt it.
var pubkey *rsa.PublicKey
pubkey, err = yubikeyClient.ReadPublicKey(ctx, logger, piv.AsymmetricConfidentiality)
if err != nil {
logger.ErrorMsg(err, "Failed to load public key")
return err
}
fileSize := len(fileBytes)
// nolint:gomnd // -11 must be a header size, this is from the rsa.go source.
maxSize := pubkey.Size() - 11
if fileSize > maxSize {
logger.InfoMsgf("Only encrypting [%d] bytes out of [%d] from file [%s]", maxSize, fileSize, fileName)
fileSize = maxSize
}
var encData []byte
encData, err = rsa.EncryptPKCS1v15(rand.Reader, pubkey, fileBytes[:fileSize])
if err != nil {
logger.ErrorMsg(err, "Failed to load public key")
return err
}
logger.InfoMsg(base64.StdEncoding.EncodeToString(encData))
return nil
}