func openArmoredPublicKeyFile(reader io.ReadCloser) (*packet.PublicKeyPacket, os.Error) {
defer reader.Close()
var lr = io.LimitReader(reader, publicKeyMaxSize)
data, err := ioutil.ReadAll(lr)
if err != nil {
return nil, os.NewError(fmt.Sprintf("Error reading public key file: %v", err))
}
if len(data) == publicKeyMaxSize {
return nil, os.NewError(fmt.Sprintf("Public key blob is too large"))
}
block, _ := armor.Decode(data)
if block == nil {
return nil, os.NewError("Couldn't find PGP block in public key file")
}
if block.Type != "PGP PUBLIC KEY BLOCK" {
return nil, os.NewError("Invalid public key blob.")
}
buf := bytes.NewBuffer(block.Bytes)
p, err := packet.ReadPacket(buf)
if err != nil {
return nil, os.NewError(fmt.Sprintf("Invalid public key blob: %v", err))
}
pk, ok := p.(packet.PublicKeyPacket)
if !ok {
return nil, os.NewError(fmt.Sprintf("Invalid public key blob; not a public key packet"))
}
return &pk, nil
}
func main() {
b, erd := armor.Decode(os.Stdin)
if erd != nil {
fmt.Println("unable to decode the Stdin")
os.Exit(2)
}
const NBUF = 512
var buf [NBUF]byte
var err, erw os.Error
var nr, nw int
for {
switch nr, err = b.Body.Read(buf[:]); true {
case nr < 0:
fmt.Fprintf(os.Stderr, "error reading from Stdin: %s\n", err.String())
os.Exit(1)
case nr == 0:
break
case nr > 0:
if nw, erw = os.Stdout.Write(buf[0:nr]); nw != nr {
fmt.Fprintf(os.Stderr, "error writing decoded bytes to Stdout: %s\n", erw.String())
os.Exit(1)
}
}
if err == os.EOF {
break
}
}
}
func (vr *VerifyRequest) VerifySignature() bool {
armorData := reArmor(vr.CamliSig)
block, _ := armor.Decode([]byte(armorData))
if block == nil {
return vr.fail("Can't parse camliSig armor")
}
buf := bytes.NewBuffer(block.Bytes)
p, err := packet.ReadPacket(buf)
if err != nil {
return vr.fail("Error reading PGP packet from camliSig")
}
sig, ok := p.(packet.SignaturePacket)
if !ok {
return vr.fail("PGP packet isn't a signature packet")
}
if sig.Hash != packet.HashFuncSHA1 {
return vr.fail("I can only verify SHA1 signatures")
}
if sig.SigType != packet.SigTypeBinary {
return vr.fail("I can only verify binary signatures")
}
hash := sha1.New()
hash.Write(vr.bp) // payload bytes
hash.Write(sig.HashSuffix)
hashBytes := hash.Sum()
if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
return vr.fail("hash tag doesn't match")
}
err = rsa.VerifyPKCS1v15(&vr.PublicKeyPacket.PublicKey, rsa.HashSHA1, hashBytes, sig.Signature)
if err != nil {
return vr.fail(fmt.Sprintf("bad signature: %s", err))
}
return true
}
func (vr *VerifyRequest) VerifySignature() bool {
armorData := reArmor(vr.CamliSig)
block, _ := armor.Decode(bytes.NewBufferString(armorData))
if block == nil {
return vr.fail("can't parse camliSig armor")
}
var p packet.Packet
var err os.Error
p, err = packet.Read(block.Body)
if err != nil {
return vr.fail("error reading PGP packet from camliSig: " + err.String())
}
sig, ok := p.(*packet.Signature)
if !ok {
return vr.fail("PGP packet isn't a signature packet")
}
if sig.Hash != crypto.SHA1 && sig.Hash != crypto.SHA256 {
return vr.fail("I can only verify SHA1 or SHA256 signatures")
}
if sig.SigType != packet.SigTypeBinary {
return vr.fail("I can only verify binary signatures")
}
hash := sig.Hash.New()
hash.Write(vr.bp) // payload bytes
err = vr.PublicKeyPacket.VerifySignature(hash, sig)
if err != nil {
return vr.fail(fmt.Sprintf("bad signature: %s", err))
}
vr.SignerKeyId = vr.PublicKeyPacket.KeyIdString()
return true
}
// readArmored reads an armored block with the given type.
func readArmored(r io.Reader, expectedType string) (body io.Reader, err os.Error) {
block, err := armor.Decode(r)
if err != nil {
return
}
if block.Type != expectedType {
return nil, error.InvalidArgumentError("expected '" + expectedType + "', got: " + block.Type)
}
return block.Body, nil
}
// ReadArmoredKeyRing reads one or more public/private keys from an armor keyring file.
func ReadArmoredKeyRing(r io.Reader) (EntityList, os.Error) {
block, err := armor.Decode(r)
if err == os.EOF {
return nil, error.InvalidArgumentError("no armored data found")
}
if err != nil {
return nil, err
}
if block.Type != PublicKeyType && block.Type != PrivateKeyType {
return nil, error.InvalidArgumentError("expected public or private key block, got: " + block.Type)
}
return ReadKeyRing(block.Body)
}
func readOpenPGPPacketFromArmoredFileOrDie(fileName string, armorType string) (p packet.Packet) {
data, err := ioutil.ReadFile(fileName)
if err != nil {
log.Exit("Cannot open '%s': %s", fileName, err)
}
block, _ := armor.Decode(data)
if block == nil {
log.Exit("cannot parse armor")
}
if block.Type != armorType {
log.Exitf("bad type in '%s' (got: %s, want: %s)", fileName, block.Type, armorType)
}
buf := bytes.NewBuffer(block.Bytes)
p, err = packet.ReadPacket(buf)
if err != nil {
log.Exitf("failed to parse packet from '%s': %s", fileName, err)
}
return
}
func openArmoredPublicKeyFile(reader io.ReadCloser) (*packet.PublicKey, os.Error) {
defer reader.Close()
var lr = io.LimitReader(reader, publicKeyMaxSize)
block, _ := armor.Decode(lr)
if block == nil {
return nil, os.NewError("Couldn't find PGP block in public key file")
}
if block.Type != "PGP PUBLIC KEY BLOCK" {
return nil, os.NewError("Invalid public key blob.")
}
p, err := packet.Read(block.Body)
if err != nil {
return nil, os.NewError(fmt.Sprintf("Invalid public key blob: %v", err))
}
pk, ok := p.(*packet.PublicKey)
if !ok {
return nil, os.NewError(fmt.Sprintf("Invalid public key blob; not a public key packet"))
}
return pk, nil
}