signer.go

Documentation: github.com/sassoftware/relic/signers/xap

     1  //
     2  // Copyright (c) SAS Institute Inc.
     3  //
     4  // Licensed under the Apache License, Version 2.0 (the "License");
     5  // you may not use this file except in compliance with the License.
     6  // You may obtain a copy of the License at
     7  //
     8  //     http://www.apache.org/licenses/LICENSE-2.0
     9  //
    10  // Unless required by applicable law or agreed to in writing, software
    11  // distributed under the License is distributed on an "AS IS" BASIS,
    12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  // See the License for the specific language governing permissions and
    14  // limitations under the License.
    15  //
    16  
    17  package xap
    18  
    19  import (
    20  	"io"
    21  	"os"
    22  
    23  	"github.com/sassoftware/relic/lib/certloader"
    24  	"github.com/sassoftware/relic/lib/magic"
    25  	"github.com/sassoftware/relic/lib/signxap"
    26  	"github.com/sassoftware/relic/signers"
    27  	"github.com/sassoftware/relic/signers/zipbased"
    28  )
    29  
    30  // Sign Silverlight / legacy Windows Phone apps
    31  
    32  var XapSigner = &signers.Signer{
    33  	Name:      "xap",
    34  	Magic:     magic.FileTypeXAP,
    35  	CertTypes: signers.CertTypeX509,
    36  	Transform: zipbased.Transform,
    37  	Sign:      sign,
    38  	Verify:    verify,
    39  }
    40  
    41  func init() {
    42  	signers.Register(XapSigner)
    43  }
    44  
    45  func sign(r io.Reader, cert *certloader.Certificate, opts signers.SignOpts) ([]byte, error) {
    46  	digest, err := signxap.DigestXapTar(r, opts.Hash, false)
    47  	if err != nil {
    48  		return nil, err
    49  	}
    50  	patch, sig, err := digest.Sign(opts.Context(), cert)
    51  	if err != nil {
    52  		return nil, err
    53  	}
    54  	opts.Audit.SetCounterSignature(sig.CounterSignature)
    55  	return opts.SetBinPatch(patch)
    56  }
    57  
    58  func verify(f *os.File, opts signers.VerifyOpts) ([]*signers.Signature, error) {
    59  	size, err := f.Seek(0, io.SeekEnd)
    60  	sig, err := signxap.Verify(f, size, opts.NoDigests)
    61  	if err != nil {
    62  		return nil, err
    63  	}
    64  	return []*signers.Signature{&signers.Signature{
    65  		Hash:          sig.Hash,
    66  		X509Signature: &sig.TimestampedSignature,
    67  	}}, nil
    68  }
    69
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