#include "tomcrypt.h"
#ifdef BASE64
static
const
unsigned
char
map[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, 254, 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 };
int
base64_decode(
const
unsigned
char
*in, unsigned
long
inlen,
unsigned
char
*out, unsigned
long
*outlen)
{
unsigned
long
t, x, y, z;
unsigned
char
c;
int
g;
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
g = 3;
for
(x = y = z = t = 0; x < inlen; x++) {
c = map[in[x]&0xFF];
if
(c == 255)
continue
;
if
(c == 254) {
c = 0;
if
(--g < 0) {
return
CRYPT_INVALID_PACKET;
}
}
else
if
(g != 3) {
return
CRYPT_INVALID_PACKET;
}
t = (t<<6)|c;
if
(++y == 4) {
if
(z + g > *outlen) {
return
CRYPT_BUFFER_OVERFLOW;
}
out[z++] = (unsigned
char
)((t>>16)&255);
if
(g > 1) out[z++] = (unsigned
char
)((t>>8)&255);
if
(g > 2) out[z++] = (unsigned
char
)(t&255);
y = t = 0;
}
}
if
(y != 0) {
return
CRYPT_INVALID_PACKET;
}
*outlen = z;
return
CRYPT_OK;
}
#endif