Mercurial > dropbear
annotate libtommath/bn_mp_to_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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rev | line source |
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1692
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Update LibTomMath to 1.2.0 (#84)
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_TO_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 /* stores a bignum as a ASCII string in a given radix (2..64) |
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7 * |
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8 * Stores upto "size - 1" chars and always a NULL byte, puts the number of characters |
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9 * written, including the '\0', in "written". |
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10 */ |
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11 mp_err mp_to_radix(const mp_int *a, char *str, size_t maxlen, size_t *written, int radix) |
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12 { |
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13 size_t digs; |
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14 mp_err err; |
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15 mp_int t; |
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16 mp_digit d; |
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17 char *_s = str; |
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18 |
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19 /* check range of radix and size*/ |
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20 if (maxlen < 2u) { |
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21 return MP_BUF; |
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22 } |
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23 if ((radix < 2) || (radix > 64)) { |
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24 return MP_VAL; |
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25 } |
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26 |
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27 /* quick out if its zero */ |
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28 if (MP_IS_ZERO(a)) { |
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29 *str++ = '0'; |
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30 *str = '\0'; |
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31 if (written != NULL) { |
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32 *written = 2u; |
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33 } |
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34 return MP_OKAY; |
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35 } |
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36 |
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37 if ((err = mp_init_copy(&t, a)) != MP_OKAY) { |
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38 return err; |
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39 } |
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40 |
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41 /* if it is negative output a - */ |
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42 if (t.sign == MP_NEG) { |
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43 /* we have to reverse our digits later... but not the - sign!! */ |
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44 ++_s; |
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45 |
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46 /* store the flag and mark the number as positive */ |
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47 *str++ = '-'; |
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48 t.sign = MP_ZPOS; |
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49 |
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50 /* subtract a char */ |
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51 --maxlen; |
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52 } |
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53 digs = 0u; |
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54 while (!MP_IS_ZERO(&t)) { |
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55 if (--maxlen < 1u) { |
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56 /* no more room */ |
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57 err = MP_BUF; |
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58 goto LBL_ERR; |
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59 } |
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60 if ((err = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) { |
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61 goto LBL_ERR; |
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62 } |
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63 *str++ = mp_s_rmap[d]; |
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64 ++digs; |
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65 } |
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66 /* reverse the digits of the string. In this case _s points |
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67 * to the first digit [exluding the sign] of the number |
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68 */ |
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69 s_mp_reverse((unsigned char *)_s, digs); |
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70 |
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71 /* append a NULL so the string is properly terminated */ |
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72 *str = '\0'; |
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73 digs++; |
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74 |
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75 if (written != NULL) { |
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76 *written = (a->sign == MP_NEG) ? (digs + 1u): digs; |
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77 } |
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78 |
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79 LBL_ERR: |
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80 mp_clear(&t); |
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81 return err; |
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82 } |
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83 |
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84 #endif |