digest.go

Documentation: github.com/sassoftware/relic/cmdline/shared

     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 shared
    18  
    19  import (
    20  	"crypto"
    21  	"fmt"
    22  
    23  	"github.com/sassoftware/relic/lib/x509tools"
    24  	"github.com/spf13/cobra"
    25  )
    26  
    27  var ArgDigest string
    28  
    29  const DefaultHash = "SHA-256"
    30  
    31  func AddDigestFlag(cmd *cobra.Command) {
    32  	cmd.Flags().StringVar(&ArgDigest, "digest", DefaultHash, "Specify a digest algorithm")
    33  }
    34  
    35  func GetDigest() (hash crypto.Hash, err error) {
    36  	if ArgDigest == "" {
    37  		// TODO: figure out why this randomly started coming back blank
    38  		ArgDigest = DefaultHash
    39  	}
    40  	hash = x509tools.HashByName(ArgDigest)
    41  	if hash == 0 {
    42  		err = fmt.Errorf("unsupported digest \"%s\"", ArgDigest)
    43  	}
    44  	return hash, err
    45  }
    46
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