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/* 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.
*/
#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: $Format:%ai$ */
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