Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/integer/der_length_integer.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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rev   line source
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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 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file der_length_integer.c
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15 ASN.1 DER, get length of encoding, Tom St Denis
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16 */
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17
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18
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19 #ifdef LTC_DER
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20 /**
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21 Gets length of DER encoding of num
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22 @param num The int to get the size of
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23 @param outlen [out] The length of the DER encoding for the given integer
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24 @return CRYPT_OK if successful
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25 */
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26 int der_length_integer(void *num, unsigned long *outlen)
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27 {
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28 unsigned long z, len;
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29 int leading_zero;
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30
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31 LTC_ARGCHK(num != NULL);
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32 LTC_ARGCHK(outlen != NULL);
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33
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34 if (mp_cmp_d(num, 0) != LTC_MP_LT) {
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35 /* positive */
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36
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37 /* we only need a leading zero if the msb of the first byte is one */
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38 if ((mp_count_bits(num) & 7) == 0 || mp_iszero(num) == LTC_MP_YES) {
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39 leading_zero = 1;
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40 } else {
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41 leading_zero = 0;
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42 }
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44 /* size for bignum */
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45 z = len = leading_zero + mp_unsigned_bin_size(num);
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46 } else {
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47 /* it's negative */
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48 /* find power of 2 that is a multiple of eight and greater than count bits */
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49 leading_zero = 0;
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50 z = mp_count_bits(num);
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51 z = z + (8 - (z & 7));
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52 if (((mp_cnt_lsb(num)+1)==mp_count_bits(num)) && ((mp_count_bits(num)&7)==0)) --z;
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53 len = z = z >> 3;
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54 }
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55
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56 /* now we need a length */
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57 if (z < 128) {
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58 /* short form */
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59 ++len;
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60 } else {
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61 /* long form (relies on z != 0), assumes length bytes < 128 */
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62 ++len;
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63
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64 while (z) {
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65 ++len;
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66 z >>= 8;
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67 }
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68 }
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69
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70 /* we need a 0x02 to indicate it's INTEGER */
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71 ++len;
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72
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73 /* return length */
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74 *outlen = len;
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75 return CRYPT_OK;
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76 }
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78 #endif
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79
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80 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/integer/der_length_integer.c,v $ */
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81 /* $Revision: 1.4 $ */
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82 /* $Date: 2006/04/22 01:22:55 $ */