Mercurial > dropbear
annotate libtommath/bn_mp_read_radix.c @ 1723:5386011b740d
Disable toom and karatsuba for new libtommath
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 18 Jun 2020 19:12:07 +0800 |
parents | 1051e4eea25a |
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_READ_RADIX_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 #define MP_TOUPPER(c) ((((c) >= 'a') && ((c) <= 'z')) ? (((c) + 'A') - 'a') : (c)) |
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7 |
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8 /* read a string [ASCII] in a given radix */ |
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9 mp_err mp_read_radix(mp_int *a, const char *str, int radix) |
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10 { |
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11 mp_err err; |
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12 int y; |
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13 mp_sign neg; |
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14 unsigned pos; |
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15 char ch; |
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16 |
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17 /* zero the digit bignum */ |
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18 mp_zero(a); |
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19 |
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20 /* make sure the radix is ok */ |
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21 if ((radix < 2) || (radix > 64)) { |
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22 return MP_VAL; |
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23 } |
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24 |
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25 /* if the leading digit is a |
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26 * minus set the sign to negative. |
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27 */ |
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28 if (*str == '-') { |
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29 ++str; |
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30 neg = MP_NEG; |
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31 } else { |
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32 neg = MP_ZPOS; |
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33 } |
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34 |
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35 /* set the integer to the default of zero */ |
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36 mp_zero(a); |
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37 |
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38 /* process each digit of the string */ |
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39 while (*str != '\0') { |
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40 /* if the radix <= 36 the conversion is case insensitive |
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41 * this allows numbers like 1AB and 1ab to represent the same value |
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42 * [e.g. in hex] |
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43 */ |
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44 ch = (radix <= 36) ? (char)MP_TOUPPER((int)*str) : *str; |
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45 pos = (unsigned)(ch - '('); |
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46 if (mp_s_rmap_reverse_sz < pos) { |
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47 break; |
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48 } |
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49 y = (int)mp_s_rmap_reverse[pos]; |
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50 |
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51 /* if the char was found in the map |
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52 * and is less than the given radix add it |
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53 * to the number, otherwise exit the loop. |
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54 */ |
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55 if ((y == 0xff) || (y >= radix)) { |
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56 break; |
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57 } |
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58 if ((err = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) { |
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59 return err; |
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60 } |
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61 if ((err = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) { |
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62 return err; |
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63 } |
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64 ++str; |
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65 } |
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66 |
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67 /* if an illegal character was found, fail. */ |
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68 if (!((*str == '\0') || (*str == '\r') || (*str == '\n'))) { |
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69 mp_zero(a); |
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70 return MP_VAL; |
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71 } |
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72 |
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73 /* set the sign only if a != 0 */ |
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74 if (!MP_IS_ZERO(a)) { |
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75 a->sign = neg; |
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76 } |
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77 return MP_OKAY; |
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78 } |
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79 #endif |