| /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
| * |
| * LibTomCrypt is a library that provides various cryptographic |
| * algorithms in a highly modular and flexible manner. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| * |
| * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com |
| */ |
| #include "tomcrypt.h" |
| |
| /** |
| @file der_encode_utf8_string.c |
| ASN.1 DER, encode a UTF8 STRING, Tom St Denis |
| */ |
| |
| |
| #ifdef LTC_DER |
| |
| /** |
| Store an UTF8 STRING |
| @param in The array of UTF8 to store (one per wchar_t) |
| @param inlen The number of UTF8 to store |
| @param out [out] The destination for the DER encoded UTF8 STRING |
| @param outlen [in/out] The max size and resulting size of the DER UTF8 STRING |
| @return CRYPT_OK if successful |
| */ |
| int der_encode_utf8_string(const wchar_t *in, unsigned long inlen, |
| unsigned char *out, unsigned long *outlen) |
| { |
| unsigned long x, y, len; |
| |
| LTC_ARGCHK(in != NULL); |
| LTC_ARGCHK(out != NULL); |
| LTC_ARGCHK(outlen != NULL); |
| |
| /* get the size */ |
| for (x = len = 0; x < inlen; x++) { |
| if (in[x] < 0 || in[x] > 0x1FFFF) { |
| return CRYPT_INVALID_ARG; |
| } |
| len += der_utf8_charsize(in[x]); |
| } |
| |
| if (len < 128) { |
| y = 2 + len; |
| } else if (len < 256) { |
| y = 3 + len; |
| } else if (len < 65536UL) { |
| y = 4 + len; |
| } else if (len < 16777216UL) { |
| y = 5 + len; |
| } else { |
| return CRYPT_INVALID_ARG; |
| } |
| |
| /* too big? */ |
| if (y > *outlen) { |
| *outlen = len; |
| return CRYPT_BUFFER_OVERFLOW; |
| } |
| |
| /* encode the header+len */ |
| x = 0; |
| out[x++] = 0x0C; |
| if (len < 128) { |
| out[x++] = len; |
| } else if (len < 256) { |
| out[x++] = 0x81; |
| out[x++] = len; |
| } else if (len < 65536UL) { |
| out[x++] = 0x82; |
| out[x++] = (len>>8)&255; |
| out[x++] = len&255; |
| } else if (len < 16777216UL) { |
| out[x++] = 0x83; |
| out[x++] = (len>>16)&255; |
| out[x++] = (len>>8)&255; |
| out[x++] = len&255; |
| } else { |
| return CRYPT_INVALID_ARG; |
| } |
| |
| /* store UTF8 */ |
| for (y = 0; y < inlen; y++) { |
| switch (der_utf8_charsize(in[y])) { |
| case 1: out[x++] = in[y]; break; |
| case 2: out[x++] = 0xC0 | ((in[y] >> 6) & 0x1F); out[x++] = 0x80 | (in[y] & 0x3F); break; |
| case 3: out[x++] = 0xE0 | ((in[y] >> 12) & 0x0F); out[x++] = 0x80 | ((in[y] >> 6) & 0x3F); out[x++] = 0x80 | (in[y] & 0x3F); break; |
| 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; |
| } |
| } |
| |
| /* retun length */ |
| *outlen = x; |
| |
| return CRYPT_OK; |
| } |
| |
| #endif |
| |
| /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utf8/der_encode_utf8_string.c,v $ */ |
| /* $Revision: 1.7 $ */ |
| /* $Date: 2006/12/16 17:41:21 $ */ |