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annotate src/main/kotlin/name/blackcap/passman/Generate.kt @ 0:a6cfdffcaa94

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Initial commit, incomplete but it runs sorta.
author David Barts <n5jrn@me.com>
date Sun, 11 Sep 2022 16:11:37 -0700
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children 698c4a3d758d
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1 package name.blackcap.passman
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2
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3 import java.lang.IllegalArgumentException
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4 import java.security.SecureRandom
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5 import java.util.Random
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6
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7 /* ASCII, alphanumeric, no 0's, 1's, I's, O's or l's to avoid confusion. */
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8 private const val DIGITS = "23456789"
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9 private const val UPPERS = "ABCDEFGHJKLMNPQRSTUVWXYZ"
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10 private const val LOWERS = "abcdefghijkmnopqrstuvwxyz"
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11 /* \ can confuse *NIX, |, ', and ` invite confusion */
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12 private const val SYMBOLS = "!\"#$%&()*+,-./:;<=>?@[]^_{}~"
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13 const val MIN_GENERATED_LENGTH = 6
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14 const val DEFAULT_GENERATED_LENGTH = 12
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15
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16 fun generate(length: Int, allowSymbols: Boolean): CharArray {
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17 /* insecure, and if REALLY short, causes bugs */
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18 if (length < MIN_GENERATED_LENGTH) {
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19 throw IllegalArgumentException("length of $length is less than $MIN_GENERATED_LENGTH")
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20 }
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21
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22 /* determine allowed characters */
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23 val passchars = if (allowSymbols) {
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24 DIGITS + UPPERS + LOWERS + SYMBOLS
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25 } else {
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26 DIGITS + UPPERS + LOWERS
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27 }
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28
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29 /* ensure we get one of each class of characters */
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30 val randomizer = SecureRandom()
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31 val generated = CharArray(length)
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32 generated[0] = randomized(DIGITS, randomizer)
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33 generated[1] = randomized(UPPERS, randomizer)
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34 generated[2] = randomized(LOWERS, randomizer)
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35 var i = 3
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36 if (allowSymbols) {
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37 generated[3] = randomized(SYMBOLS, randomizer)
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38 i = 4
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39 }
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40
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41 /* generate the rest of the characters */
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42 while (i < length) {
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43 generated[i++] = randomized(passchars, randomizer)
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44 }
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45
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46 /* scramble them */
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47 for (i in 0 until length) {
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48 val j = randomizer.nextInt(length)
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49 if (i != j) {
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50 val temp = generated[i]
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51 generated[i] = generated[j]
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52 generated[j] = temp
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53 }
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54 }
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55
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56 /* AMF... */
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57 return generated
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58 }
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59
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60 private fun randomized(passchars: String, randomizer: Random): Char =
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61 passchars[randomizer.nextInt(passchars.length)]