dropbear: bn_mp_fread.c comparison

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+:22d5cf7d4b1a
+/* 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
+* additional optimizations in place.
+*
+* The library is free for all purposes without any express
+* guarantee it works.
+*
+* Tom St Denis, [email protected], http://math.libtomcrypt.org
+*/
+#include <tommath.h>
+/* read a bigint from a file stream in ASCII */
+int mp_fread(mp_int *a, int radix, FILE *stream)
+{
+int err, ch, neg, y;
+/* clear a */
+mp_zero(a);
+/* if first digit is - then set negative */
+ch = fgetc(stream);
+if (ch == '-') {
+neg = MP_NEG;
+ch = fgetc(stream);
+} else {
+neg = MP_ZPOS;
+}
+for (;;) {
+/* find y in the radix map */
+for (y = 0; y < radix; y++) {
+if (mp_s_rmap[y] == ch) {
+break;
+}
+}
+if (y == radix) {
+break;
+}
+/* shift up and add */
+if ((err = mp_mul_d(a, radix, a)) != MP_OKAY) {
+return err;
+}
+if ((err = mp_add_d(a, y, a)) != MP_OKAY) {
+return err;
+}
+ch = fgetc(stream);
+}
+if (mp_cmp_d(a, 0) != MP_EQ) {
+a->sign = neg;
+}
+return MP_OKAY;
+}

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