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  1. /*
  2. * This code is based on an OpenSSL implementation of chacha20.
  3. * Hence, the copyright below applies.
  4. *
  5. */
  6. /* ====================================================================
  7. * Copyright (c) 2011-2013 The OpenSSL Project. All rights reserved.
  8. *
  9. * Redistribution and use in source and binary forms, with or without
  10. * modification, are permitted provided that the following conditions
  11. * are met:
  12. *
  13. * 1. Redistributions of source code must retain the above copyright
  14. * notice, this list of conditions and the following disclaimer.
  15. *
  16. * 2. Redistributions in binary form must reproduce the above copyright
  17. * notice, this list of conditions and the following disclaimer in
  18. * the documentation and/or other materials provided with the
  19. * distribution.
  20. *
  21. * 3. All advertising materials mentioning features or use of this
  22. * software must display the following acknowledgment:
  23. * "This product includes software developed by the OpenSSL Project
  24. * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25. *
  26. * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27. * endorse or promote products derived from this software without
  28. * prior written permission. For written permission, please contact
  29. * licensing@OpenSSL.org.
  30. *
  31. * 5. Products derived from this software may not be called "OpenSSL"
  32. * nor may "OpenSSL" appear in their names without prior written
  33. * permission of the OpenSSL Project.
  34. *
  35. * 6. Redistributions of any form whatsoever must retain the following
  36. * acknowledgment:
  37. * "This product includes software developed by the OpenSSL Project
  38. * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39. *
  40. * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41. * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43. * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46. * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49. * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50. * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51. * OF THE POSSIBILITY OF SUCH DAMAGE.
  52. * ====================================================================
  53. */
  54. #ifndef CHACHA_H
  55. #define CHACHA_H
  56. #include <stddef.h>
  57. typedef unsigned int uint32_t;
  58. /* CRYPTO_chacha_20 encrypts |in_len| bytes from |in| with the given key and
  59. * nonce and writes the result to |out|, which may be equal to |in|. The
  60. * initial block counter is specified by |counter|. */
  61. void CRYPTO_chacha_20(unsigned char *out,
  62. const unsigned char *in, size_t in_len,
  63. const unsigned char key[32],
  64. const unsigned char nonce[12],
  65. uint32_t counter);
  66. /* CRYPTO_chacha_20_keystream generates |out_len| bytes from the generated keystream with the given key and
  67. * nonce and writes the result to |out|. The
  68. * initial block counter is specified by |counter|. */
  69. void CRYPTO_chacha_20_keystream(unsigned char *out,
  70. size_t out_len,
  71. const unsigned char key[32],
  72. const unsigned char nonce[12],
  73. uint32_t counter);
  74. #endif