golang使用opengpg

golang使用opengpg

package mainimport ( "fmt" "io" "io/ioutil" "os" "strings" "golang.org/x/crypto/openpgp" "golang.org/x/crypto/openpgp/armor" "golang.org/x/crypto/openpgp/packet")// command to generatepublic key in desired format: gpg --output public.pgp --export your@mail.comconst ( publicKey = "public.pgp" helderKey = "helderPrivateKey.asc")func main() { // source file sourceBytes, err := ioutil.ReadFile("a1.pdf") // destination file dst, err := os.Create("a5.pdf.gpg") if err != nil { panic(err) } defer dst.Close() //read public key entityKey, err := readEntity() if err != nil { fmt.Println(err) } // encrypt erro := encryptFile([]*openpgp.Entity{entityKey}, nil, sourceBytes, dst) if erro != nil { fmt.Println(erro) } // decrypt decryptFile()}func readEntity() (*openpgp.Entity, error) { f, err := os.Open(publicKey) if err != nil { return nil, err } defer f.Close() block, err := armor.Decode(f) if err != nil { return nil, err } return openpgp.ReadEntity(packet.NewReader(block.Body))}func encryptFile(recip []*openpgp.Entity, signer *openpgp.Entity, r []byte, w io.Writer) error { // init some vars var entity *openpgp.Entity var entityList openpgp.EntityList // Open the private key file keyringFileBuffer, err := os.Open(helderKey) if err != nil { fmt.Println(err) } defer keyringFileBuffer.Close() entityList, err = openpgp.ReadKeyRing(keyringFileBuffer) if err != nil { fmt.Println(err) } entity = entityList[0] passphraseByte := []byte("XXXXXXXXXX") entity.PrivateKey.Decrypt(passphraseByte) for _, subkey := range entity.Subkeys { subkey.PrivateKey.Decrypt(passphraseByte) } sourceText := string(r) wc, err := openpgp.Encrypt(w, recip, entity, &openpgp.FileHints{IsBinary: true}, nil) if err != nil { return err } if _, err := io.Copy(wc, strings.NewReader(sourceText)); err != nil { return err } return wc.Close()}func decryptFile() error { dst, err := os.Open("a6.pdf.sig") if err != nil { panic(err) } defer dst.Close() // init some vars var entityList openpgp.EntityList // Open the public key file keyringFileBuffer, err := os.Open(publicKey) if err != nil { fmt.Println(err) } defer keyringFileBuffer.Close() entityList, err = openpgp.ReadKeyRing(keyringFileBuffer) if err != nil { fmt.Println(err) } md, err := openpgp.ReadMessage(dst, entityList, nil, nil) if err != nil { fmt.Println(err) } entity := md.SignedBy.Entity for key := range entity.Identities { fmt.Println("Key:", key) } ww, err := os.Create("a8.pdf") if err != nil { panic(err) } defer ww.Close() if _, err := io.Copy(ww, md.UnverifiedBody); err != nil { fmt.Println(err) } return nil}func signFile(input []byte, output io.Writer, myEntity *openpgp.Entity) error { if writeCloser, err := openpgp.Sign(output, myEntity, &openpgp.FileHints{IsBinary: true}, nil); err != nil { return err } else { writeCloser.Write(input) return writeCloser.Close() }}

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