// ReadCertificate reads a transaction certificate from the TCA.
//
func (tcap *TCAP) ReadCertificate(ctx context.Context, req *pb.TCertReadReq) (*pb.Cert, error) {
Trace.Println("grpc TCAP:ReadCertificate")
id := req.Id.Id
raw, err := tcap.tca.eca.readCertificate(id, x509.KeyUsageDigitalSignature)
if err != nil {
return nil, err
}
cert, err := x509.ParseCertificate(raw)
if err != nil {
return nil, err
}
sig := req.Sig
req.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
hash := sha3.New384()
raw, _ = proto.Marshal(req)
hash.Write(raw)
if ecdsa.Verify(cert.PublicKey.(*ecdsa.PublicKey), hash.Sum(nil), r, s) == false {
return nil, errors.New("signature does not verify")
}
raw, err = tcap.tca.readCertificate1(id, req.Ts.Seconds)
if err != nil {
return nil, err
}
return &pb.Cert{raw}, nil
}
// ReadCertificate reads a transaction certificate from the TCA.
//
func (tcap *TCAP) ReadCertificate(ctx context.Context, in *pb.TCertReadReq) (*pb.Cert, error) {
Trace.Println("grpc TCAP:ReadCertificate")
req := in.Req.Id
id := in.Id.Id
if req != id && tcap.tca.eca.readRole(req)&(int(pb.Role_VALIDATOR)|int(pb.Role_AUDITOR)) == 0 {
return nil, errors.New("access denied")
}
raw, err := tcap.tca.eca.readCertificate(req, x509.KeyUsageDigitalSignature)
if err != nil {
return nil, err
}
cert, err := x509.ParseCertificate(raw)
if err != nil {
return nil, err
}
sig := in.Sig
in.Sig = nil
r, s := big.NewInt(0), big.NewInt(0)
r.UnmarshalText(sig.R)
s.UnmarshalText(sig.S)
hash := sha3.New384()
raw, _ = proto.Marshal(in)
hash.Write(raw)
if ecdsa.Verify(cert.PublicKey.(*ecdsa.PublicKey), hash.Sum(nil), r, s) == false {
return nil, errors.New("signature does not verify")
}
if in.Ts.Seconds != 0 {
raw, err = tcap.tca.readCertificate1(id, in.Ts.Seconds)
} else {
raw, err = tcap.tca.readCertificateByHash(in.Hash.Hash)
}
if err != nil {
return nil, err
}
return &pb.Cert{raw}, nil
}