signer.go

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

     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 apk
    18  
    19  import (
    20  	"io"
    21  
    22  	"github.com/pkg/errors"
    23  	"github.com/sassoftware/relic/lib/certloader"
    24  	"github.com/sassoftware/relic/lib/magic"
    25  	"github.com/sassoftware/relic/signers"
    26  	"github.com/sassoftware/relic/signers/zipbased"
    27  )
    28  
    29  // Sign Android packages
    30  
    31  var ApkSigner = &signers.Signer{
    32  	Name:      "apk",
    33  	Magic:     magic.FileTypeAPK,
    34  	CertTypes: signers.CertTypeX509,
    35  	Transform: zipbased.Transform,
    36  	Sign:      sign,
    37  	Verify:    verify,
    38  }
    39  
    40  const (
    41  	sigMagic = "APK Sig Block 42"
    42  	sigApkV2 = 0x7109871a
    43  
    44  	directoryEndSignature = 0x06054b50
    45  	directoryEndLen       = 22
    46  )
    47  
    48  var (
    49  	errMalformed = errors.New("malformed APK signing block")
    50  	errTruncated = errors.New("truncated APK signing block sequence")
    51  )
    52  
    53  func init() {
    54  	signers.Register(ApkSigner)
    55  }
    56  
    57  func sign(r io.Reader, cert *certloader.Certificate, opts signers.SignOpts) ([]byte, error) {
    58  	digest, err := digestApkStream(r, opts.Hash)
    59  	if err != nil {
    60  		return nil, err
    61  	}
    62  	patchset, err := digest.Sign(cert)
    63  	if err != nil {
    64  		return nil, err
    65  	}
    66  	return opts.SetBinPatch(patchset)
    67  }
    68
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