Problem - Kevin Tafuro

*len = 0;
outbuf = 0;
}
return outbuf;
}
The public API to this code is:
unsigned char *spc_base64_decode(unsigned char *buf, size_t *len, int strict, int
*err);
The API assumes that buf is a NULL-terminated string. The len parameter is a pointer
that receives the length of the binary output. If there is an error, the memory pointed
to by len will be 0, and the value pointed to by err will be non-zero. The error will be
-1 if there is a padding error, -2 if strict checking was requested, but a character outside
the strict set is found, and -3 if malloc( ) fails.
See Also
Recipe 4.5
4.7 Representing Keys (or Other Binary Data)
as English Text
Problem
You want to use an easy-to-read format for displaying keys (or fingerprints or some
other interesting binary data). English would work better than a hexadecimal representation
because people’s ability to recognize the key as correct by sight will be better.
Solution
Map a particular number of bits to a dictionary of words. The dictionary should be
of such a size that an exact mapping to a number of bits is possible. That is, the dictionary
should have a number of entries that is a power of two.
Discussion
The spc_bin2words() function shown here converts a binary string of the specified
number of bytes into a string of English words. This function takes two arguments:
str is the binary string to convert, and len is the number of bytes to be converted.
#include
#include
#include "wordlist.h"
#define BITS_IN_LIST 11
128 | Chapter 4: Symmetric Cryptography Fundamentals
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