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comparison libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
parents f849a5ca2efc
children
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1470:8bba51a55704 1471:6dba84798cd5
3 * LibTomCrypt is a library that provides various cryptographic 3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtom.org
10 */ 8 */
11 #include "tomcrypt.h" 9 #include "tomcrypt.h"
12 10
13 /** 11 /**
14 @file der_length_bit_string.c 12 @file der_length_bit_string.c
15 ASN.1 DER, get length of BIT STRING, Tom St Denis 13 ASN.1 DER, get length of BIT STRING, Tom St Denis
16 */ 14 */
17 15
18 #ifdef LTC_DER 16 #ifdef LTC_DER
19 /** 17 /**
20 Gets length of DER encoding of BIT STRING 18 Gets length of DER encoding of BIT STRING
21 @param nbits The number of bits in the string to encode 19 @param nbits The number of bits in the string to encode
22 @param outlen [out] The length of the DER encoding for the given string 20 @param outlen [out] The length of the DER encoding for the given string
23 @return CRYPT_OK if successful 21 @return CRYPT_OK if successful
24 */ 22 */
25 int der_length_bit_string(unsigned long nbits, unsigned long *outlen) 23 int der_length_bit_string(unsigned long nbits, unsigned long *outlen)
27 unsigned long nbytes; 25 unsigned long nbytes;
28 LTC_ARGCHK(outlen != NULL); 26 LTC_ARGCHK(outlen != NULL);
29 27
30 /* get the number of the bytes */ 28 /* get the number of the bytes */
31 nbytes = (nbits >> 3) + ((nbits & 7) ? 1 : 0) + 1; 29 nbytes = (nbits >> 3) + ((nbits & 7) ? 1 : 0) + 1;
32 30
33 if (nbytes < 128) { 31 if (nbytes < 128) {
34 /* 03 LL PP DD DD DD ... */ 32 /* 03 LL PP DD DD DD ... */
35 *outlen = 2 + nbytes; 33 *outlen = 2 + nbytes;
36 } else if (nbytes < 256) { 34 } else if (nbytes < 256) {
37 /* 03 81 LL PP DD DD DD ... */ 35 /* 03 81 LL PP DD DD DD ... */
47 } 45 }
48 46
49 #endif 47 #endif
50 48
51 49
52 /* $Source$ */ 50 /* ref: $Format:%D$ */
53 /* $Revision$ */ 51 /* git commit: $Format:%H$ */
54 /* $Date$ */ 52 /* commit time: $Format:%ai$ */