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comparison src/pk/asn1/der/utf8/der_encode_utf8_string.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16

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Update to LibTomCrypt 1.16
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:22:00 +0000
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280:59400faa4b44 380:d5faf4814ddb
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 $ */