1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
6 * The library is free for all purposes without any express
9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
14 @file der_encode_utf8_string.c
15 ASN.1 DER, encode a UTF8 STRING, Tom St Denis
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
29 int der_encode_utf8_string(const wchar_t *in, unsigned long inlen,
30 unsigned char *out, unsigned long *outlen)
32 unsigned long x, y, len;
34 LTC_ARGCHK(in != NULL);
35 LTC_ARGCHK(out != NULL);
36 LTC_ARGCHK(outlen != NULL);
39 for (x = len = 0; x < inlen; x++) {
40 if (in[x] < 0 || in[x] > 0x1FFFF) {
41 return CRYPT_INVALID_ARG;
43 len += der_utf8_charsize(in[x]);
48 } else if (len < 256) {
50 } else if (len < 65536UL) {
52 } else if (len < 16777216UL) {
55 return CRYPT_INVALID_ARG;
61 return CRYPT_BUFFER_OVERFLOW;
64 /* encode the header+len */
69 } else if (len < 256) {
72 } else if (len < 65536UL) {
74 out[x++] = (len>>8)&255;
76 } else if (len < 16777216UL) {
78 out[x++] = (len>>16)&255;
79 out[x++] = (len>>8)&255;
82 return CRYPT_INVALID_ARG;
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;
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 $ */