Mercurial > dropbear

annotate libtommath/bn_mp_fread.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 1051e4eea25a
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_FREAD_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
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6 #ifndef MP_NO_FILE
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7 /* read a bigint from a file stream in ASCII */
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8 mp_err mp_fread(mp_int *a, int radix, FILE *stream)
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9 {
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10 mp_err err;
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11 mp_sign neg;
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12
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13 /* if first digit is - then set negative */
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14 int ch = fgetc(stream);
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15 if (ch == (int)'-') {
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16 neg = MP_NEG;
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17 ch = fgetc(stream);
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18 } else {
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19 neg = MP_ZPOS;
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20 }
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21
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22 /* no digits, return error */
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23 if (ch == EOF) {
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24 return MP_ERR;
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25 }
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26
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27 /* clear a */
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28 mp_zero(a);
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29
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30 do {
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31 int y;
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32 unsigned pos = (unsigned)(ch - (int)'(');
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33 if (mp_s_rmap_reverse_sz < pos) {
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34 break;
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35 }
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37 y = (int)mp_s_rmap_reverse[pos];
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38
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39 if ((y == 0xff) || (y >= radix)) {
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40 break;
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41 }
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42
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43 /* shift up and add */
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44 if ((err = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) {
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45 return err;
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46 }
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47 if ((err = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) {
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48 return err;
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49 }
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50 } while ((ch = fgetc(stream)) != EOF);
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51
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52 if (a->used != 0) {
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53 a->sign = neg;
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54 }
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55
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56 return MP_OKAY;
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57 }
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58 #endif
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60 #endif