forked from keybase/client
/
saltpack_verify.go
144 lines (120 loc) · 3.25 KB
/
saltpack_verify.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package libkb
import (
"bytes"
"crypto/hmac"
"io"
"github.com/keybase/client/go/logger"
"github.com/keybase/saltpack"
)
// SaltpackVerifyContext is context for engine calls
type SaltpackVerifyContext interface {
GetLog() logger.Logger
}
func SaltpackVerify(g SaltpackVerifyContext, source io.Reader, sink io.WriteCloser, checkSender func(saltpack.SigningPublicKey) error) error {
sc, newSource, err := ClassifyStream(source)
if err != nil {
return err
}
if sc.Format != CryptoMessageFormatSaltpack {
return WrongCryptoFormatError{
Wanted: CryptoMessageFormatSaltpack,
Received: sc.Format,
Operation: "verify",
}
}
source = newSource
kr := echoKeyring{}
var skey saltpack.SigningPublicKey
var vs io.Reader
var frame saltpack.Frame
if sc.Armored {
skey, vs, frame, err = saltpack.NewDearmor62VerifyStream(saltpack.CheckKnownMajorVersion, source, kr)
} else {
skey, vs, err = saltpack.NewVerifyStream(saltpack.CheckKnownMajorVersion, source, kr)
}
if err != nil {
g.GetLog().Debug("saltpack.NewDearmor62VerifyStream error: %s", err)
return err
}
if checkSender != nil {
if err = checkSender(skey); err != nil {
return err
}
}
n, err := io.Copy(sink, vs)
if err != nil {
return err
}
if sc.Armored {
if brand, err := saltpack.CheckArmor62Frame(frame, saltpack.MessageTypeAttachedSignature); err != nil {
return err
} else if err = checkSaltpackBrand(brand); err != nil {
return err
}
}
g.GetLog().Debug("Verify: read %d bytes", n)
if err := sink.Close(); err != nil {
return err
}
return nil
}
func SaltpackVerifyDetached(g SaltpackVerifyContext, message io.Reader, signature []byte, checkSender func(saltpack.SigningPublicKey) error) error {
sc, _, err := ClassifyStream(bytes.NewReader(signature))
if err != nil {
return err
}
if sc.Format != CryptoMessageFormatSaltpack {
return WrongCryptoFormatError{
Wanted: CryptoMessageFormatSaltpack,
Received: sc.Format,
Operation: "verify detached",
}
}
kr := echoKeyring{}
var skey saltpack.SigningPublicKey
if sc.Armored {
var brand string
skey, brand, err = saltpack.Dearmor62VerifyDetachedReader(saltpack.CheckKnownMajorVersion, message, string(signature), kr)
if err != nil {
g.GetLog().Debug("saltpack.Dearmor62VerifyDetachedReader error: %s", err)
return err
}
if err = checkSaltpackBrand(brand); err != nil {
return err
}
} else {
skey, err = saltpack.VerifyDetachedReader(saltpack.CheckKnownMajorVersion, message, signature, kr)
if err != nil {
g.GetLog().Debug("saltpack.VerifyDetachedReader error: %s", err)
return err
}
}
if checkSender != nil {
if err = checkSender(skey); err != nil {
return err
}
}
return nil
}
type echoKeyring struct {
Contextified
}
func (e echoKeyring) LookupSigningPublicKey(kid []byte) saltpack.SigningPublicKey {
var k NaclSigningKeyPublic
copy(k[:], kid)
return saltSignerPublic{key: k}
}
type sigKeyring struct {
saltSigner
}
func (s sigKeyring) LookupSigningPublicKey(kid []byte) saltpack.SigningPublicKey {
if s.GetPublicKey() == nil {
return nil
}
if hmac.Equal(s.GetPublicKey().ToKID(), kid) {
return s.GetPublicKey()
}
return nil
}