mirror of https://github.com/perkeep/perkeep.git
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package jsonsign
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import (
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"fmt"
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"os"
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"io"
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"crypto/openpgp/armor"
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"crypto/openpgp/packet"
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"strings"
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)
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const publicKeyMaxSize = 256 * 1024
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func VerifyPublicKeyFile(file, keyid string) (bool, os.Error) {
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f, err := os.Open(file)
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if err != nil {
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return false, err
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}
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key, err := openArmoredPublicKeyFile(f)
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if err != nil {
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return false, err
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}
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keyId := fmt.Sprintf("%X", key.Fingerprint[len(key.Fingerprint)-4:])
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if keyId != strings.ToUpper(keyid) {
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return false, os.NewError(fmt.Sprintf("Key in file %q has id %q; expected %q",
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file, keyId, keyid))
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}
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return true, nil
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}
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func openArmoredPublicKeyFile(reader io.ReadCloser) (*packet.PublicKey, os.Error) {
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defer reader.Close()
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var lr = io.LimitReader(reader, publicKeyMaxSize)
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block, _ := armor.Decode(lr)
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if block == nil {
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return nil, os.NewError("Couldn't find PGP block in public key file")
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}
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if block.Type != "PGP PUBLIC KEY BLOCK" {
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return nil, os.NewError("Invalid public key blob.")
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}
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p, err := packet.Read(block.Body)
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if err != nil {
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return nil, os.NewError(fmt.Sprintf("Invalid public key blob: %v", err))
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}
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pk, ok := p.(*packet.PublicKey)
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if !ok {
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return nil, os.NewError(fmt.Sprintf("Invalid public key blob; not a public key packet"))
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}
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return pk, nil
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}
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