Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.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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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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13 /**
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14 @file der_length_bit_string.c
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15 ASN.1 DER, get length of BIT STRING, Tom St Denis
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16 */
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18 #ifdef LTC_DER
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19 /**
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20 Gets length of DER encoding of BIT STRING
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21 @param nbits The number of bits in the string to encode
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22 @param outlen [out] The length of the DER encoding for the given string
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23 @return CRYPT_OK if successful
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24 */
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25 int der_length_bit_string(unsigned long nbits, unsigned long *outlen)
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26 {
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27 unsigned long nbytes;
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28 LTC_ARGCHK(outlen != NULL);
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29
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30 /* get the number of the bytes */
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31 nbytes = (nbits >> 3) + ((nbits & 7) ? 1 : 0) + 1;
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33 if (nbytes < 128) {
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34 /* 03 LL PP DD DD DD ... */
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35 *outlen = 2 + nbytes;
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36 } else if (nbytes < 256) {
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37 /* 03 81 LL PP DD DD DD ... */
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38 *outlen = 3 + nbytes;
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39 } else if (nbytes < 65536) {
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40 /* 03 82 LL LL PP DD DD DD ... */
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41 *outlen = 4 + nbytes;
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42 } else {
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43 return CRYPT_INVALID_ARG;
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44 }
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45
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46 return CRYPT_OK;
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47 }
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49 #endif
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51
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52 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c,v $ */
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53 /* $Revision: 1.2 $ */
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54 /* $Date: 2006/03/31 14:15:35 $ */