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https://github.com/nabbar/golib.git
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8516f33fe0
- logger - password # Fix Archive : - create archive : add params to clean prefix path from contents path # Fix Nutsdb : - fix client command detection - add test for unknown command before parsing - fix snapshoot process for cluster
77 lines
2.5 KiB
Go
77 lines
2.5 KiB
Go
/*
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* MIT License
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*
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* Copyright (c) 2019 Nicolas JUHEL
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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package password
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import (
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"math/rand"
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"time"
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)
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const letterBytes = "abcdefghijklmnopqrstuvwxyz,;:!?./*%^$&\"'(-_)=+~#{[|`\\^@]}ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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const (
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// If we have 93 chars, that means 7 bits code a letter index.
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// So 63 random bits can designate 63/7 = 9 different letter indices.
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// Let's use all those 10.
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letterIdxBits = 7 // 6 bits to represent a letter index
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letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
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letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
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loopRandMaxLen = 10
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)
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func randStringBytesMaskImprSrc(n int) string {
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var src = rand.NewSource(time.Now().UnixNano())
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b := make([]byte, n)
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// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
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for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
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if remain == 0 {
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cache, remain = src.Int63(), letterIdxMax
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}
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if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
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b[i] = letterBytes[idx]
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i--
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}
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cache >>= letterIdxBits
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remain--
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}
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return string(b)
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}
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// Generate Generate a random string could be used as password.
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// The len is defined by given 'n' parameters.
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func Generate(n int) string {
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if n > loopRandMaxLen {
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var s = ""
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for i := n; i > 0; i -= loopRandMaxLen {
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s += randStringBytesMaskImprSrc(loopRandMaxLen)
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}
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return s[0 : n-1]
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}
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return randStringBytesMaskImprSrc(n)
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}
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