SecureRandomSpi.java 2.9 KB

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  1. /* SecureRandomSpi.java --- Secure Random Service Provider Interface
  2. Copyright (C) 1999 Free Software Foundation, Inc.
  3. This file is part of GNU Classpath.
  4. GNU Classpath is free software; you can redistribute it and/or modify
  5. it under the terms of the GNU General Public License as published by
  6. the Free Software Foundation; either version 2, or (at your option)
  7. any later version.
  8. GNU Classpath is distributed in the hope that it will be useful, but
  9. WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. General Public License for more details.
  12. You should have received a copy of the GNU General Public License
  13. along with GNU Classpath; see the file COPYING. If not, write to the
  14. Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA.
  16. Linking this library statically or dynamically with other modules is
  17. making a combined work based on this library. Thus, the terms and
  18. conditions of the GNU General Public License cover the whole
  19. combination.
  20. As a special exception, the copyright holders of this library give you
  21. permission to link this library with independent modules to produce an
  22. executable, regardless of the license terms of these independent
  23. modules, and to copy and distribute the resulting executable under
  24. terms of your choice, provided that you also meet, for each linked
  25. independent module, the terms and conditions of the license of that
  26. module. An independent module is a module which is not derived from
  27. or based on this library. If you modify this library, you may extend
  28. this exception to your version of the library, but you are not
  29. obligated to do so. If you do not wish to do so, delete this
  30. exception statement from your version. */
  31. package java.security;
  32. import java.io.Serializable;
  33. /**
  34. SecureRandomSpi is the Service Provider Interface for SecureRandom
  35. providers. It provides an interface for providers to the
  36. SecureRandom engine to write their own pseudo-random number
  37. generator.
  38. @since JDK 1.2
  39. @author Mark Benvenuto <ivymccough@worldnet.att.net>
  40. */
  41. public abstract class SecureRandomSpi implements Serializable
  42. {
  43. static final long serialVersionUID = -2991854161009191830L;
  44. /**
  45. Default Constructor for SecureRandomSpi
  46. */
  47. public SecureRandomSpi()
  48. {
  49. }
  50. /**
  51. Updates the seed for SecureRandomSpi but does not reset seed.
  52. It does to this so repeated called never decrease randomness.
  53. */
  54. protected abstract void engineSetSeed(byte[] seed);
  55. /**
  56. Gets a user specified number of bytes depending on the length
  57. of the array?
  58. @param bytes array to fill with random bytes
  59. */
  60. protected abstract void engineNextBytes(byte[] bytes);
  61. /**
  62. Gets a user specified number of bytes specified by the
  63. parameter.
  64. @param numBytes number of random bytes to generate
  65. @return an array full of random bytes
  66. */
  67. protected abstract byte[] engineGenerateSeed(int numBytes);
  68. }