microsoft.go

Documentation: github.com/sassoftware/relic/lib/pkcs9

     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 pkcs9
    18  
    19  import (
    20  	"bytes"
    21  	"encoding/asn1"
    22  	"encoding/base64"
    23  	"net/http"
    24  
    25  	"github.com/sassoftware/relic/lib/pkcs7"
    26  )
    27  
    28  // Microsoft non-RFC-3161 timestamping
    29  // https://msdn.microsoft.com/en-us/library/windows/desktop/bb931395(v=vs.85).aspx
    30  
    31  type MicrosoftTimeStampRequest struct {
    32  	CounterSignatureType asn1.ObjectIdentifier
    33  	Attributes           struct{} `asn1:"optional"`
    34  	Content              struct {
    35  		ContentType asn1.ObjectIdentifier
    36  		Content     []byte `asn1:"explicit,tag:0"`
    37  	}
    38  }
    39  
    40  func NewLegacyRequest(url string, encryptedDigest []byte) (*http.Request, error) {
    41  	var msg MicrosoftTimeStampRequest
    42  	msg.CounterSignatureType = OidSpcTimeStampRequest
    43  	msg.Content.ContentType = pkcs7.OidData
    44  	msg.Content.Content = encryptedDigest
    45  	blob, err := asn1.Marshal(msg)
    46  	if err != nil {
    47  		return nil, err
    48  	}
    49  	req, err := http.NewRequest("POST", url, bytes.NewReader(blob))
    50  	if err != nil {
    51  		return nil, err
    52  	}
    53  	req.Header.Set("Content-Type", "application/octet-stream")
    54  	return req, nil
    55  }
    56  
    57  func ParseLegacyResponse(body []byte) (*pkcs7.ContentInfoSignedData, error) {
    58  	rblob, err := base64.StdEncoding.DecodeString(string(bytes.TrimRight(body, "\x00")))
    59  	if err != nil {
    60  		return nil, err
    61  	}
    62  	psd := new(pkcs7.ContentInfoSignedData)
    63  	if _, err := asn1.Unmarshal(rblob, psd); err != nil {
    64  		return nil, err
    65  	}
    66  	return psd, nil
    67  }
    68
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