60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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#ifdef LTC_PKCS_12
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int pkcs12_utf8_to_utf16(const unsigned char *in, unsigned long inlen,
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unsigned char *out, unsigned long *outlen) {
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unsigned long len = 0;
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const unsigned char* in_end = in + inlen;
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const ulong32 offset[6] = {
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0x00000000UL, 0x00003080UL, 0x000E2080UL,
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0x03C82080UL, 0xFA082080UL, 0x82082080UL
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};
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int err = CRYPT_ERROR;
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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while (in < in_end) {
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ulong32 ch = 0;
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unsigned short extra = 0; /* 0 */
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if (*in >= 192) extra++; /* 1 */
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if (*in >= 224) extra++; /* 2 */
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if (*in >= 240) extra++; /* 3 */
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if (*in >= 248) extra++; /* 4 */
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if (*in >= 252) extra++; /* 5 */
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if (in + extra >= in_end) goto ERROR;
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switch (extra) {
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case 5: ch += *in++; ch <<= 6;
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/* FALLTHROUGH */
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case 4: ch += *in++; ch <<= 6;
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/* FALLTHROUGH */
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case 3: ch += *in++; ch <<= 6;
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/* FALLTHROUGH */
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case 2: ch += *in++; ch <<= 6;
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/* FALLTHROUGH */
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case 1: ch += *in++; ch <<= 6;
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/* FALLTHROUGH */
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case 0: ch += *in++;
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}
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ch -= offset[extra];
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if (ch > 0xFFFF) goto ERROR;
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if (*outlen >= len + 2) {
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out[len] = (unsigned short)((ch >> 8) & 0xFF);
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out[len + 1] = (unsigned char)(ch & 0xFF);
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}
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len += 2;
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}
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err = len > *outlen ? CRYPT_BUFFER_OVERFLOW : CRYPT_OK;
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*outlen = len;
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ERROR:
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return err;
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}
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#endif
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