#include <config.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include "sudoers.h"
static const unsigned char base64dec_tab[256]= {
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255,
255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255,
255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
};
size_t
base64_decode(const char *in, unsigned char *out, size_t out_size)
{
unsigned char *out_end = out + out_size;
const unsigned char *out0 = out;
unsigned int rem, v;
debug_decl(base64_decode, SUDOERS_DEBUG_MATCH)
for (v = 0, rem = 0; *in != '\0' && *in != '='; in++) {
unsigned char ch = base64dec_tab[(unsigned char)*in];
if (ch == 255)
debug_return_size_t((size_t)-1);
v = (v << 6) | ch;
rem += 6;
if (rem >= 8) {
rem -= 8;
if (out >= out_end)
debug_return_size_t((size_t)-1);
*out++ = (v >> rem) & 0xff;
}
}
if (rem >= 8) {
if (out >= out_end)
debug_return_size_t((size_t)-1);
*out++ = (v >> rem) & 0xff;
}
debug_return_size_t((size_t)(out - out0));
}
static const unsigned char base64enc_tab[64] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
size_t
base64_encode(const unsigned char *in, size_t in_len, char *out, size_t out_len)
{
size_t ii, io;
unsigned int rem, v;
debug_decl(base64_encode, SUDOERS_DEBUG_MATCH)
for (io = 0, ii = 0, v = 0, rem = 0; ii < in_len; ii++) {
unsigned char ch = in[ii];
v = (v << 8) | ch;
rem += 8;
while (rem >= 6) {
rem -= 6;
if (io >= out_len)
debug_return_size_t((size_t)-1);
out[io++] = base64enc_tab[(v >> rem) & 63];
}
}
if (rem != 0) {
v <<= (6 - rem);
if (io >= out_len)
debug_return_size_t((size_t)-1);
out[io++] = base64enc_tab[v&63];
}
while (io & 3) {
if (io >= out_len)
debug_return_size_t((size_t)-1);
out[io++] = '=';
}
if (io >= out_len)
debug_return_size_t((size_t)-1);
out[io] = '\0';
debug_return_size_t(io);
}