58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
/*
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Copyright 2019 The Crossplane Authors.
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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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http://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 password contains a simple password generator.
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package password
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import (
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"crypto/rand"
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"math/big"
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)
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// Settings for password generation.
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type Settings struct {
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// CharacterSet of allowed password characters.
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CharacterSet string
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// Length of generated passwords.
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Length int
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}
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// Default password generation settings.
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var Default = Settings{
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CharacterSet: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
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Length: 27,
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}
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// Generate a random, 27 character password that may consist of lowercase
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// letters, uppercase letters, or numbers.
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func Generate() (string, error) {
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return Default.Generate()
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}
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// Generate a password.
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func (s Settings) Generate() (string, error) {
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pw := make([]byte, s.Length)
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for i := 0; i < s.Length; i++ {
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n, err := rand.Int(rand.Reader, big.NewInt(int64(len(s.CharacterSet))))
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if err != nil {
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return "", err
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}
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pw[i] = s.CharacterSet[n.Int64()]
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}
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return string(pw), nil
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}
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