+
−/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+
− *
+
− * LibTomCrypt is a library that provides various cryptographic
+
− * algorithms in a highly modular and flexible manner.
+
− *
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− * The library is free for all purposes without any express
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− * guarantee it works.
+
− */
+
−#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 (!der_utf8_valid_char(in[x])) 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 = y;
+
−      return CRYPT_BUFFER_OVERFLOW;
+
−   }
+
−
+
−   /* encode the header+len */
+
−   x = 0;
+
−   out[x++] = 0x0C;
+
−   if (len < 128) {
+
−      out[x++] = (unsigned char)len;
+
−   } else if (len < 256) {
+
−      out[x++] = 0x81;
+
−      out[x++] = (unsigned char)len;
+
−   } else if (len < 65536UL) {
+
−      out[x++] = 0x82;
+
−      out[x++] = (unsigned char)((len>>8)&255);
+
−      out[x++] = (unsigned char)(len&255);
+
−   } else if (len < 16777216UL) {
+
−      out[x++] = 0x83;
+
−      out[x++] = (unsigned char)((len>>16)&255);
+
−      out[x++] = (unsigned char)((len>>8)&255);
+
−      out[x++] = (unsigned char)(len&255);
+
−   } else {
+
−       /* coverity[dead_error_line] */
+
−      return CRYPT_INVALID_ARG;
+
−   }
+
−
+
−   /* store UTF8 */
+
−   for (y = 0; y < inlen; y++) {
+
−       switch (der_utf8_charsize(in[y])) {
+
−          case 1: out[x++] = (unsigned char)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;
+
−#if !defined(LTC_WCHAR_MAX) || LTC_WCHAR_MAX > 0xFFFF
+
−          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;
+
−#endif
+
−       }
+
−   }
+
−
+
−   /* retun length */
+
−   *outlen = x;
+
−
+
−   return CRYPT_OK;
+
−}
+
−
+
−#endif
+
−
+
−/* ref:         $Format:%D$ */
+
−/* git commit:  $Format:%H$ */
+
−/* commit time: $Format:%ai$ */