Mercurial > dropbear

comparison libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c @ 382:0cbe8f6dbf9e

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 2af22fb4e878750b88f80f90d439b316d229796f) to branch 'au.asn.ucc.matt.dropbear' (head 02c413252c90e9de8e03d91e9939dde3029f5c0a)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:41:05 +0000
parents
children f849a5ca2efc
comparison
equal deleted inserted replaced
379:b66a00272a90 382:0cbe8f6dbf9e
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.com
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file der_encode_utf8_string.c
15 ASN.1 DER, encode a UTF8 STRING, Tom St Denis
16 */
17
18
19 #ifdef LTC_DER
20
21 /**
22 Store an UTF8 STRING
23 @param in The array of UTF8 to store (one per wchar_t)
24 @param inlen The number of UTF8 to store
25 @param out [out] The destination for the DER encoded UTF8 STRING
26 @param outlen [in/out] The max size and resulting size of the DER UTF8 STRING
27 @return CRYPT_OK if successful
28 */
29 int der_encode_utf8_string(const wchar_t *in, unsigned long inlen,
30 unsigned char *out, unsigned long *outlen)
31 {
32 unsigned long x, y, len;
33
34 LTC_ARGCHK(in != NULL);
35 LTC_ARGCHK(out != NULL);
36 LTC_ARGCHK(outlen != NULL);
37
38 /* get the size */
39 for (x = len = 0; x < inlen; x++) {
40 if (in[x] < 0 || in[x] > 0x1FFFF) {
41 return CRYPT_INVALID_ARG;
42 }
43 len += der_utf8_charsize(in[x]);
44 }
45
46 if (len < 128) {
47 y = 2 + len;
48 } else if (len < 256) {
49 y = 3 + len;
50 } else if (len < 65536UL) {
51 y = 4 + len;
52 } else if (len < 16777216UL) {
53 y = 5 + len;
54 } else {
55 return CRYPT_INVALID_ARG;
56 }
57
58 /* too big? */
59 if (y > *outlen) {
60 *outlen = len;
61 return CRYPT_BUFFER_OVERFLOW;
62 }
63
64 /* encode the header+len */
65 x = 0;
66 out[x++] = 0x0C;
67 if (len < 128) {
68 out[x++] = len;
69 } else if (len < 256) {
70 out[x++] = 0x81;
71 out[x++] = len;
72 } else if (len < 65536UL) {
73 out[x++] = 0x82;
74 out[x++] = (len>>8)&255;
75 out[x++] = len&255;
76 } else if (len < 16777216UL) {
77 out[x++] = 0x83;
78 out[x++] = (len>>16)&255;
79 out[x++] = (len>>8)&255;
80 out[x++] = len&255;
81 } else {
82 return CRYPT_INVALID_ARG;
83 }
84
85 /* store UTF8 */
86 for (y = 0; y < inlen; y++) {
87 switch (der_utf8_charsize(in[y])) {
88 case 1: out[x++] = in[y]; break;
89 case 2: out[x++] = 0xC0 | ((in[y] >> 6) & 0x1F); out[x++] = 0x80 | (in[y] & 0x3F); break;
90 case 3: out[x++] = 0xE0 | ((in[y] >> 12) & 0x0F); out[x++] = 0x80 | ((in[y] >> 6) & 0x3F); out[x++] = 0x80 | (in[y] & 0x3F); break;
91 case 4: out[x++] = 0xF0 | ((in[y] >> 18) & 0x07); out[x++] = 0x80 | ((in[y] >> 12) & 0x3F); out[x++] = 0x80 | ((in[y] >> 6) & 0x3F); out[x++] = 0x80 | (in[y] & 0x3F); break;
92 }
93 }
94
95 /* retun length */
96 *outlen = x;
97
98 return CRYPT_OK;
99 }
100
101 #endif
102
103 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c,v $ */
104 /* $Revision: 1.7 $ */
105 /* $Date: 2006/12/16 17:41:21 $ */