/
checksum.go
85 lines (77 loc) · 1.63 KB
/
checksum.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 checksum
import (
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"hash"
"hash/crc32"
)
const HashChoices = "'md5', 'sha1', 'sha256', 'sha512', 'crc'"
type HashTyp int
const (
md5Hash HashTyp = iota
sha1Hash
sha256Hash
sha512Hash
crcHash
)
func GetHash(typ string) HashTyp {
switch typ {
case "", "false":
case "md5", "MD5":
return md5Hash
case "sha1", "SHA1":
return sha1Hash
case "sha256", "SHA256":
return sha256Hash
case "sha512", "SHA512":
return sha512Hash
case "crc", "CRC":
return crcHash
}
return -1
}
func MakeHash(typ HashTyp) hash.Hash {
switch typ {
case md5Hash:
return md5.New()
case sha1Hash:
return sha1.New()
case sha256Hash:
return sha256.New()
case sha512Hash:
return sha512.New()
case crcHash:
return crc32.NewIEEE()
}
return nil
}
func (typ HashTyp) String() string {
switch typ {
case md5Hash:
return "md5"
case sha1Hash:
return "sha1"
case sha256Hash:
return "sha256"
case sha512Hash:
return "sha512"
case crcHash:
return "crc"
}
return ""
}