Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/integer/der_length_integer.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 6dba84798cd5
children
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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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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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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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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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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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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: $Format:%ai$ */