2d523314d8
Updating linter to latest version, which also updates gosec to latest version to keep on top of updated security checks in source code. Also disable gosec testing for rand.new. Co-Authored-By: Alexander Hughes <Alexander.Hughes@pm.me> Co-Authored-By: Sreejith Punnapuzha <Sreejith.Punnapuzha@outlook.com> Change-Id: I46e71c41597f70150ace6d9611da5a01f93a933d Signed-off-by: Alexander Hughes <Alexander.Hughes@pm.me>
113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
/*
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package generate
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import (
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"math/rand"
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"strings"
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)
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const (
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defaultLength = 24
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asciiLowers = "abcdefghijklmnopqrstuvwxyz"
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asciiUppers = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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asciiNumbers = "0123456789"
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asciiSymbols = "@#&-+=?"
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)
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var (
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// pool is the complete collection of characters that can be used for a
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// passphrase
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pool []byte
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)
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func init() {
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pool = append(pool, []byte(asciiLowers)...)
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pool = append(pool, []byte(asciiUppers)...)
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pool = append(pool, []byte(asciiNumbers)...)
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pool = append(pool, []byte(asciiSymbols)...)
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}
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// EncryptionKeyEngine is used to generate secure random passphrases
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type EncryptionKeyEngine struct {
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rng *rand.Rand
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pool []byte
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}
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// NewEncryptionKeyEngine creates an PassphraseEngine using src. If src is nil,
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// the returned PassphraseEngine will use the default Source
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func NewEncryptionKeyEngine(src rand.Source) *EncryptionKeyEngine {
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if src == nil {
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src = &Source{}
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}
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return &EncryptionKeyEngine{
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rng: rand.New(src), //nolint:gosec
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pool: pool,
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}
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}
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// GenerateEncryptionKey returns a secure random string of length 24,
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// containing at least one of each from the following sets:
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// [0-9]
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// [a-z]
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// [A-Z]
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// [@#&-+=?]
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func (e *EncryptionKeyEngine) GenerateEncryptionKey() string {
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return e.GenerateEncryptionKeyN(defaultLength)
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}
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// GenerateEncryptionKeyN returns a secure random string containing at least
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// one of each from the following sets. Its length will be max(length, 24)
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// [0-9]
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// [a-z]
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// [A-Z]
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// [@#&-+=?]
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func (e *EncryptionKeyEngine) GenerateEncryptionKeyN(length int) string {
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if length < defaultLength {
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length = defaultLength
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}
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var encryptionkey string
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for !e.isValidEncryptionKey(encryptionkey) {
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var sb strings.Builder
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for i := 0; i < length; i++ {
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randIndex := e.rng.Intn(len(e.pool))
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randChar := e.pool[randIndex]
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sb.WriteString(string(randChar))
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}
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encryptionkey = sb.String()
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}
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return encryptionkey
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}
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func (e *EncryptionKeyEngine) isValidEncryptionKey(encryptionkey string) bool {
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if len(encryptionkey) < defaultLength {
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return false
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}
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charSets := []string{
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asciiLowers,
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asciiUppers,
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asciiNumbers,
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asciiSymbols,
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}
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for _, charSet := range charSets {
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if !strings.ContainsAny(encryptionkey, charSet) {
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return false
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}
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}
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return true
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}
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