forked from richardlehane/siegfried
/
hash.go
80 lines (74 loc) · 1.63 KB
/
hash.go
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// Copyright 2015 Richard Lehane. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"errors"
"hash"
"hash/crc32"
)
const hashChoices = "'md5', 'sha1', 'sha256', 'sha512', 'crc'"
var checksum hash.Hash
func setHash() error {
switch *hashf {
case "":
case "md5", "MD5":
checksum = md5.New()
case "sha1", "SHA1":
checksum = sha1.New()
case "sha256", "SHA256":
checksum = sha256.New()
case "sha512", "SHA512":
checksum = sha512.New()
case "crc", "CRC":
checksum = crc32.NewIEEE()
default:
return errors.New("Siegfried: invalid hash type; choose from " + hashChoices)
}
return nil
}
func hashHeader(pad bool) string {
switch *hashf {
default:
return "no"
case "md5", "MD5":
if pad {
return "md5 "
}
return "md5"
case "sha1", "SHA1":
if pad {
return "sha1 "
}
return "sha1"
case "sha256", "SHA256":
if pad {
return "sha256"
}
return "sha256"
case "sha512", "SHA512":
if pad {
return "sha512"
}
return "sha512"
case "crc", "CRC":
if pad {
return "crc "
}
return "crc"
}
}