SDESCoderUtil.kt 4.2 KB

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  1. /*
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  20. * .&888888I Copyright (c) 2016-2020. 博锐尚格科技股份有限公司
  21. * ~8888'
  22. * .!88~ All rights reserved.
  23. *
  24. * *********************************************************************************************************************
  25. */
  26. package com.persagy.service.utils.crypt
  27. import javax.crypto.Cipher
  28. import javax.crypto.KeyGenerator
  29. import javax.crypto.SecretKeyFactory
  30. import javax.crypto.spec.DESKeySpec
  31. import java.io.IOException
  32. import java.security.Key
  33. import java.security.NoSuchAlgorithmException
  34. import java.security.SecureRandom
  35. import java.util.*
  36. /**
  37. * DES安全编码组件
  38. *
  39. * @author Andy
  40. */
  41. abstract class SDESCoderUtil : SCoderUtil() {
  42. companion object {
  43. const val ALGORITHM = "DES"
  44. /**
  45. * 转换密钥
  46. *
  47. * @param key
  48. * @return
  49. * @throws Exception
  50. */
  51. @Throws(Exception::class)
  52. private fun toKey(key: ByteArray?): Key {
  53. val dks = DESKeySpec(key!!)
  54. val keyFactory = SecretKeyFactory.getInstance(ALGORITHM)
  55. return keyFactory.generateSecret(dks)
  56. }
  57. /**
  58. * 解密
  59. *
  60. * @param data
  61. * @param key
  62. * @return
  63. * @throws Exception
  64. */
  65. @Throws(Exception::class)
  66. fun decrypt(data: ByteArray, key: String): ByteArray {
  67. val k = toKey(Base64.getDecoder().decode(key))
  68. val cipher = Cipher.getInstance(ALGORITHM)
  69. cipher.init(Cipher.DECRYPT_MODE, k)
  70. return cipher.doFinal(data)
  71. } // Fun decrypt()
  72. /**
  73. * 加密
  74. *
  75. * @param data
  76. * @param key
  77. * @return
  78. * @throws Exception
  79. */
  80. @Throws(Exception::class)
  81. fun encrypt(data: ByteArray, key: String): ByteArray {
  82. val k = toKey(Base64.getDecoder().decode(key))
  83. val cipher = Cipher.getInstance(ALGORITHM)
  84. cipher.init(Cipher.ENCRYPT_MODE, k)
  85. return cipher.doFinal(data)
  86. } // Fun encrypt()
  87. /**
  88. * 生成密钥
  89. *
  90. * @param seed
  91. * @return
  92. * @throws IOException
  93. * @throws NoSuchAlgorithmException
  94. */
  95. @Throws(IOException::class, NoSuchAlgorithmException::class)
  96. @JvmOverloads
  97. fun initKey(seed: String? = null): String? {
  98. val secureRandom = if (seed != null) {
  99. SecureRandom(Base64.getDecoder().decode(seed))
  100. } else {
  101. SecureRandom()
  102. }
  103. val kg = KeyGenerator.getInstance(ALGORITHM)
  104. kg.init(secureRandom)
  105. val secretKey = kg.generateKey()
  106. return Base64.getEncoder().encodeToString(secretKey.encoded)
  107. } // Fun initKey()
  108. } // companion object
  109. } // Class SDESCoderUtil