* Patch from Frédéric Moulins adding options to authorized_keys. Needs review.
author Matt Johnston Mon, 08 Sep 2008 15:14:02 +0000 5ff8218bcee9 60fc6476e044
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```#include <tommath.h>
/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
* LibTomMath is a library that provides multiple-precision
* integer arithmetic as well as number theoretic functionality.
*
* The library was designed directly after the MPI library by
* Michael Fromberger but has been written from scratch with
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, [email protected], http://math.libtomcrypt.com
*/

{
int     y, res, neg;
char    ch;

/* zero the digit bignum */
mp_zero(a);

/* make sure the radix is ok */
return MP_VAL;
}

/* if the leading digit is a
* minus set the sign to negative.
*/
if (*str == '-') {
++str;
neg = MP_NEG;
} else {
neg = MP_ZPOS;
}

/* set the integer to the default of zero */
mp_zero (a);

/* process each digit of the string */
while (*str) {
/* if the radix < 36 the conversion is case insensitive
* this allows numbers like 1AB and 1ab to represent the same  value
* [e.g. in hex]
*/
ch = (char) ((radix < 36) ? toupper (*str) : *str);
for (y = 0; y < 64; y++) {
if (ch == mp_s_rmap[y]) {
break;
}
}

/* if the char was found in the map
* to the number, otherwise exit the loop.
*/
if ((res = mp_mul_d (a, (mp_digit) radix, a)) != MP_OKAY) {
return res;
}
if ((res = mp_add_d (a, (mp_digit) y, a)) != MP_OKAY) {
return res;
}
} else {
break;
}
++str;
}

/* set the sign only if a != 0 */
if (mp_iszero(a) != 1) {
a->sign = neg;
}
return MP_OKAY;
}
#endif