1// Copyright 2016 The go-ethereum Authors 2// This file is part of the go-ethereum library. 3// 4// The go-ethereum library is free software: you can redistribute it and/or modify 5// it under the terms of the GNU Lesser General Public License as published by 6// the Free Software Foundation, either version 3 of the License, or 7// (at your option) any later version. 8// 9// The go-ethereum library is distributed in the hope that it will be useful, 10// but WITHOUT ANY WARRANTY; without even the implied warranty of 11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12// GNU Lesser General Public License for more details. 13// 14// You should have received a copy of the GNU Lesser General Public License 15// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. 16 17// signFile reads the contents of an input file and signs it (in armored format) 18// with the key provided, placing the signature into the output file. 19 20package build 21 22import ( 23 "bytes" 24 "fmt" 25 "os" 26 27 "golang.org/x/crypto/openpgp" 28) 29 30// PGPSignFile parses a PGP private key from the specified string and creates a 31// signature file into the output parameter of the input file. 32// 33// Note, this method assumes a single key will be container in the pgpkey arg, 34// furthermore that it is in armored format. 35func PGPSignFile(input string, output string, pgpkey string) error { 36 // Parse the keyring and make sure we only have a single private key in it 37 keys, err := openpgp.ReadArmoredKeyRing(bytes.NewBufferString(pgpkey)) 38 if err != nil { 39 return err 40 } 41 if len(keys) != 1 { 42 return fmt.Errorf("key count mismatch: have %d, want %d", len(keys), 1) 43 } 44 // Create the input and output streams for signing 45 in, err := os.Open(input) 46 if err != nil { 47 return err 48 } 49 defer in.Close() 50 51 out, err := os.Create(output) 52 if err != nil { 53 return err 54 } 55 defer out.Close() 56 57 // Generate the signature and return 58 return openpgp.ArmoredDetachSign(out, keys[0], in, nil) 59} 60 61// PGPKeyID parses an armored key and returns the key ID. 62func PGPKeyID(pgpkey string) (string, error) { 63 keys, err := openpgp.ReadArmoredKeyRing(bytes.NewBufferString(pgpkey)) 64 if err != nil { 65 return "", err 66 } 67 if len(keys) != 1 { 68 return "", fmt.Errorf("key count mismatch: have %d, want %d", len(keys), 1) 69 } 70 return keys[0].PrimaryKey.KeyIdString(), nil 71} 72