Mercurial > dropbear

comparison libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c @ 285:1b9e69c058d2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
parents
children 0cbe8f6dbf9e
comparison
equal deleted inserted replaced
281:997e6f7dc01e 285:1b9e69c058d2
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file der_encode_octet_string.c
15 ASN.1 DER, encode a OCTET STRING, Tom St Denis
16 */
17
18
19 #ifdef LTC_DER
20
21 /**
22 Store an OCTET STRING
23 @param in The array of OCTETS to store (one per char)
24 @param inlen The number of OCTETS to store
25 @param out [out] The destination for the DER encoded OCTET STRING
26 @param outlen [in/out] The max size and resulting size of the DER OCTET STRING
27 @return CRYPT_OK if successful
28 */
29 int der_encode_octet_string(const unsigned char *in, unsigned long inlen,
30 unsigned char *out, unsigned long *outlen)
31 {
32 unsigned long x, y, len;
33 int err;
34
35 LTC_ARGCHK(in != NULL);
36 LTC_ARGCHK(out != NULL);
37 LTC_ARGCHK(outlen != NULL);
38
39 /* get the size */
40 if ((err = der_length_octet_string(inlen, &len)) != CRYPT_OK) {
41 return err;
42 }
43
44 /* too big? */
45 if (len > *outlen) {
46 return CRYPT_BUFFER_OVERFLOW;
47 }
48
49 /* encode the header+len */
50 x = 0;
51 out[x++] = 0x04;
52 if (inlen < 128) {
53 out[x++] = inlen;
54 } else if (inlen < 256) {
55 out[x++] = 0x81;
56 out[x++] = inlen;
57 } else if (inlen < 65536UL) {
58 out[x++] = 0x82;
59 out[x++] = (inlen>>8)&255;
60 out[x++] = inlen&255;
61 } else if (inlen < 16777216UL) {
62 out[x++] = 0x83;
63 out[x++] = (inlen>>16)&255;
64 out[x++] = (inlen>>8)&255;
65 out[x++] = inlen&255;
66 } else {
67 return CRYPT_INVALID_ARG;
68 }
69
70 /* store octets */
71 for (y = 0; y < inlen; y++) {
72 out[x++] = in[y];
73 }
74
75 /* retun length */
76 *outlen = x;
77
78 return CRYPT_OK;
79 }
80
81 #endif
82
83 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c,v $ */
84 /* $Revision: 1.1 $ */
85 /* $Date: 2005/05/16 15:08:11 $ */