Mercurial > cgi-bin > hgweb.cgi > PassMan

annotate src/main/kotlin/name/blackcap/passman/Encryption.kt @ 5:ad997df1f560

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Fix see() to be about as good as sccc.
author David Barts <n5jrn@me.com>
date Sun, 11 Sep 2022 21:29:20 -0700
parents a6cfdffcaa94
children 711cc42e96d7
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1 package name.blackcap.passman
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2
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3 import java.nio.ByteBuffer
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4 import java.nio.CharBuffer
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5 import java.nio.charset.Charset
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6 import java.nio.charset.StandardCharsets
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7 import java.security.SecureRandom
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8 import javax.crypto.Cipher
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9 import javax.crypto.SecretKey
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10 import javax.crypto.SecretKeyFactory
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11 import javax.crypto.spec.IvParameterSpec
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12 import javax.crypto.spec.PBEKeySpec
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13 import javax.crypto.spec.SecretKeySpec
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14 import javax.security.auth.Destroyable
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15
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16 class Encryption(passwordIn: CharArray, saltIn: ByteArray) : Destroyable {
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17 private companion object {
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18 const val ITERATIONS = 390000
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19 const val IV_LENGTH = 16
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20 const val KEY_LENGTH = 256
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21 const val ENCRYPTION_ALGORITHM = "AES/CBC/PKCS5Padding"
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22 const val KEY_ALGORITHM = "AES"
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23 const val SECRET_KEY_FACTORY = "PBKDF2WithHmacSHA256"
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24 val CHARSET : Charset = StandardCharsets.UTF_8
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25 val ZERO_IV = ByteArray(IV_LENGTH).apply { clear() }
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26 }
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27
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28 private val secretKey = getSecretKey(passwordIn, saltIn)
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29 private val secureRandom = SecureRandom()
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30
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31 fun encrypt(plaintext: CharArray): ByteArray {
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32 val iv = ByteArray(IV_LENGTH).also { secureRandom.nextBytes(it) }
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33 return encrypt(plaintext, iv)
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34 }
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35
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36 private fun encrypt(plaintext: CharArray, iv: ByteArray): ByteArray {
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37 val cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM)
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38 cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivFactory(iv))
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39 val inBuffer = CHARSET.encode(CharBuffer.wrap(plaintext))
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40 val outBuffer = ByteBuffer.allocate(cipher.getOutputSize(inBuffer.limit()) + IV_LENGTH)
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41 outBuffer.put(iv)
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42 cipher.doFinal(inBuffer, outBuffer)
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43 return outBuffer.array()
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44 }
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45
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46 fun encryptFromString(plaintext: String): ByteArray = encrypt(plaintext.toCharArray())
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47
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48 fun encryptFromString0(plaintext: String): ByteArray =
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49 encrypt(plaintext.toCharArray(), ZERO_IV)
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50
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51 fun decrypt(ciphertext: ByteArray): CharArray {
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52 val cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM)
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53 cipher.init(Cipher.DECRYPT_MODE, secretKey, ivFactory(ciphertext))
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54 val bytes = cipher.doFinal(ciphertext, IV_LENGTH, ciphertext.size - IV_LENGTH)
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55 val charBuffer = CHARSET.decode(ByteBuffer.wrap(bytes))
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56 bytes.clear()
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57 val ret = CharArray(charBuffer.limit())
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58 charBuffer.run {
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59 rewind()
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60 get(ret)
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61 zero()
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62 }
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63 return ret
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64 }
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65
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66 fun decryptToString(ciphertext: ByteArray): String = String(decrypt(ciphertext))
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67
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68 override fun destroy() {
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69 secretKey.destroy()
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70 }
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71
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72 override fun isDestroyed(): Boolean {
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73 return secretKey.isDestroyed
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74 }
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75
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76 protected fun finalize() {
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77 destroy()
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78 }
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79
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80 private fun getSecretKey(password: CharArray, salt: ByteArray): SecretKey {
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81 val factory = SecretKeyFactory.getInstance(SECRET_KEY_FACTORY)
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82 val spec = PBEKeySpec(password, salt, ITERATIONS, KEY_LENGTH)
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83 return SecretKeySpec(factory.generateSecret(spec).encoded, KEY_ALGORITHM)
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84 }
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85
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86 private fun ivFactory(ciphertext: ByteArray) = IvParameterSpec(ciphertext, 0, IV_LENGTH)
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87 }
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88
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89 fun ByteArray.clear() = indices.forEach { this[it] = 0 }
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90
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91 fun CharArray.clear() = indices.forEach { this[it] = '\u0000' }
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92
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93 fun CharBuffer.zero() {
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94 clear()
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95 array().clear()
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96 }