timestamp.go

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

     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 pkcs
    18  
    19  // Verify PKCS#7 SignedData structures.
    20  
    21  import (
    22  	"io/ioutil"
    23  	"os"
    24  
    25  	"github.com/sassoftware/relic/lib/magic"
    26  	"github.com/sassoftware/relic/lib/pkcs7"
    27  	"github.com/sassoftware/relic/lib/pkcs9"
    28  	"github.com/sassoftware/relic/lib/x509tools"
    29  	"github.com/sassoftware/relic/signers"
    30  )
    31  
    32  var PkcsSigner = &signers.Signer{
    33  	Name:      "pkcs7",
    34  	Magic:     magic.FileTypePKCS7,
    35  	CertTypes: signers.CertTypeX509,
    36  	Sign:      nil,
    37  	Verify:    Verify,
    38  }
    39  
    40  func init() {
    41  	PkcsSigner.Flags().String("content", "", "Specify file containing contents for detached signatures")
    42  	signers.Register(PkcsSigner)
    43  }
    44  
    45  func Verify(f *os.File, opts signers.VerifyOpts) ([]*signers.Signature, error) {
    46  	blob, err := ioutil.ReadAll(f)
    47  	if err != nil {
    48  		return nil, err
    49  	}
    50  	psd, err := pkcs7.Unmarshal(blob)
    51  	if err != nil {
    52  		return nil, err
    53  	}
    54  	var cblob []byte
    55  	if !opts.NoDigests && opts.Content != "" {
    56  		cblob, err = ioutil.ReadFile(opts.Content)
    57  		if err != nil {
    58  			return nil, err
    59  		}
    60  	}
    61  	sig, err := psd.Content.Verify(cblob, opts.NoDigests)
    62  	if err != nil {
    63  		return nil, err
    64  	}
    65  	ts, err := pkcs9.VerifyOptionalTimestamp(sig)
    66  	if err != nil {
    67  		return nil, err
    68  	}
    69  	hash, _ := x509tools.PkixDigestToHash(ts.SignerInfo.DigestAlgorithm)
    70  	return []*signers.Signature{&signers.Signature{
    71  		Hash:          hash,
    72  		X509Signature: &ts,
    73  	}}, nil
    74  }
    75
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