Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/integer/der_length_integer.c @ 1870:0dcc5b0d93fa
Make re-exec work with "dropbearmulti dropbear"
The re-exec needs to know to use the dropbearmulti binary instead.
Add a test for this case.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 01 Feb 2022 22:18:23 +0800 |
parents | 6dba84798cd5 |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file der_length_integer.c |
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13 ASN.1 DER, get length of encoding, Tom St Denis |
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14 */ |
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15 |
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16 |
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17 #ifdef LTC_DER |
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18 /** |
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19 Gets length of DER encoding of num |
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20 @param num The int to get the size of |
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21 @param outlen [out] The length of the DER encoding for the given integer |
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22 @return CRYPT_OK if successful |
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23 */ |
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24 int der_length_integer(void *num, unsigned long *outlen) |
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25 { |
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26 unsigned long z, len; |
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27 int leading_zero; |
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28 |
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29 LTC_ARGCHK(num != NULL); |
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30 LTC_ARGCHK(outlen != NULL); |
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31 |
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32 if (mp_cmp_d(num, 0) != LTC_MP_LT) { |
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33 /* positive */ |
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34 |
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35 /* we only need a leading zero if the msb of the first byte is one */ |
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36 if ((mp_count_bits(num) & 7) == 0 || mp_iszero(num) == LTC_MP_YES) { |
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37 leading_zero = 1; |
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38 } else { |
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39 leading_zero = 0; |
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40 } |
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41 |
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42 /* size for bignum */ |
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43 z = len = leading_zero + mp_unsigned_bin_size(num); |
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44 } else { |
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45 /* it's negative */ |
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46 /* find power of 2 that is a multiple of eight and greater than count bits */ |
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47 z = mp_count_bits(num); |
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48 z = z + (8 - (z & 7)); |
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49 if (((mp_cnt_lsb(num)+1)==mp_count_bits(num)) && ((mp_count_bits(num)&7)==0)) --z; |
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50 len = z = z >> 3; |
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51 } |
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52 |
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53 /* now we need a length */ |
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54 if (z < 128) { |
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55 /* short form */ |
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56 ++len; |
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57 } else { |
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58 /* long form (relies on z != 0), assumes length bytes < 128 */ |
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59 ++len; |
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60 |
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61 while (z) { |
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62 ++len; |
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63 z >>= 8; |
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64 } |
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65 } |
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66 |
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67 /* we need a 0x02 to indicate it's INTEGER */ |
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68 ++len; |
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69 |
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70 /* return length */ |
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71 *outlen = len; |
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72 return CRYPT_OK; |
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73 } |
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74 |
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75 #endif |
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76 |
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77 /* ref: $Format:%D$ */ |
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78 /* git commit: $Format:%H$ */ |
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79 /* commit time: $Format:%ai$ */ |