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  1. /*
  2. * Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
  3. *
  4. * This program is free software; you can redistribute it and/or
  5. * modify it under the terms of the GNU General Public License as
  6. * published by the Free Software Foundation; either version 2 of the
  7. * License, or any later version.
  8. *
  9. * This program is distributed in the hope that it will be useful, but
  10. * WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. * General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License
  15. * along with this program; if not, write to the Free Software
  16. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17. */
  18. FILE_LICENCE ( GPL2_OR_LATER );
  19. #include <stdint.h>
  20. #include <string.h>
  21. #include <assert.h>
  22. #include <gpxe/base64.h>
  23. /** @file
  24. *
  25. * Base64 encoding
  26. *
  27. */
  28. static const char base64[64] =
  29. "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  30. /**
  31. * Base64-encode a string
  32. *
  33. * @v raw Raw string
  34. * @v encoded Buffer for encoded string
  35. *
  36. * The buffer must be the correct length for the encoded string. Use
  37. * something like
  38. *
  39. * char buf[ base64_encoded_len ( strlen ( raw ) ) + 1 ];
  40. *
  41. * (the +1 is for the terminating NUL) to provide a buffer of the
  42. * correct size.
  43. */
  44. void base64_encode ( const char *raw, char *encoded ) {
  45. const uint8_t *raw_bytes = ( ( const uint8_t * ) raw );
  46. uint8_t *encoded_bytes = ( ( uint8_t * ) encoded );
  47. size_t raw_bit_len = ( 8 * strlen ( raw ) );
  48. unsigned int bit;
  49. unsigned int tmp;
  50. for ( bit = 0 ; bit < raw_bit_len ; bit += 6 ) {
  51. tmp = ( ( raw_bytes[ bit / 8 ] << ( bit % 8 ) ) |
  52. ( raw_bytes[ bit / 8 + 1 ] >> ( 8 - ( bit % 8 ) ) ) );
  53. tmp = ( ( tmp >> 2 ) & 0x3f );
  54. *(encoded_bytes++) = base64[tmp];
  55. }
  56. for ( ; ( bit % 8 ) != 0 ; bit += 6 )
  57. *(encoded_bytes++) = '=';
  58. *(encoded_bytes++) = '\0';
  59. DBG ( "Base64-encoded \"%s\" as \"%s\"\n", raw, encoded );
  60. assert ( strlen ( encoded ) == base64_encoded_len ( strlen ( raw ) ) );
  61. }