/*

 * Copyright 1999-2023 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/pkcs12.h>

#include "p12_local.h"

#include "crypto/pkcs7/pk7_local.h"

/* Cheap and nasty Unicode stuff */

unsigned char *OPENSSL_asc2uni(const char *asc, int asclen,

                               unsigned char **uni, int *unilen)

{

    int ulen, i;

    unsigned char *unitmp;

    if (asclen == -1)

        asclen = strlen(asc);

    if (asclen < 0)

        return NULL;

    ulen = asclen * 2 + 2;

    if ((unitmp = OPENSSL_malloc(ulen)) == NULL)

        return NULL;

    for (i = 0; i < ulen - 2; i += 2) {

        unitmp[i] = 0;

        unitmp[i + 1] = asc[i >> 1];

    }

    /* Make result double null terminated */

    unitmp[ulen - 2] = 0;

    unitmp[ulen - 1] = 0;

    if (unilen)

        *unilen = ulen;

    if (uni)

        *uni = unitmp;

    return unitmp;

}

char *OPENSSL_uni2asc(const unsigned char *uni, int unilen)

{

    int asclen, i;

    char *asctmp;

    /* string must contain an even number of bytes */

    if (unilen & 1)

        return NULL;

    if (unilen < 0)

        return NULL;

    asclen = unilen / 2;

    /* If no terminating zero allow for one */

    if (!unilen || uni[unilen - 1])

        asclen++;

    uni++;

    if ((asctmp = OPENSSL_malloc(asclen)) == NULL)

        return NULL;

    for (i = 0; i < unilen; i += 2)

        asctmp[i >> 1] = uni[i];

    asctmp[asclen - 1] = 0;

    return asctmp;

}

/*

 * OPENSSL_{utf82uni|uni2utf8} perform conversion between UTF-8 and

 * PKCS#12 BMPString format, which is specified as big-endian UTF-16.

 * One should keep in mind that even though BMPString is passed as

 * unsigned char *, it's not the kind of string you can exercise e.g.

 * strlen on. Caller also has to keep in mind that its length is

 * expressed not in number of UTF-16 characters, but in number of

 * bytes the string occupies, and treat it, the length, accordingly.

 */

unsigned char *OPENSSL_utf82uni(const char *asc, int asclen,

                                unsigned char **uni, int *unilen)

{

    int ulen, i, j;

    unsigned char *unitmp, *ret;

    unsigned long utf32chr = 0;

    if (asclen == -1)

        asclen = strlen(asc);

    for (ulen = 0, i = 0; i < asclen; i += j) {

        j = UTF8_getc((const unsigned char *)asc+i, asclen-i, &utf32chr);

        /*

         * Following condition is somewhat opportunistic is sense that

         * decoding failure is used as *indirect* indication that input

         * string might in fact be extended ASCII/ANSI/ISO-8859-X. The

         * fallback is taken in hope that it would allow to process

         * files created with previous OpenSSL version, which used the

         * naive OPENSSL_asc2uni all along. It might be worth noting

         * that probability of false positive depends on language. In

         * cases covered by ISO Latin 1 probability is very low, because

         * any printable non-ASCII alphabet letter followed by another

         * or any ASCII character will trigger failure and fallback.

         * In other cases situation can be intensified by the fact that

         * English letters are not part of alternative keyboard layout,

         * but even then there should be plenty of pairs that trigger

         * decoding failure...

         */

        if (j < 0)

            return OPENSSL_asc2uni(asc, asclen, uni, unilen);

        if (utf32chr > 0x10FFFF)        /* UTF-16 cap */

            return NULL;

        if (utf32chr >= 0x10000)        /* pair of UTF-16 characters */

            ulen += 2*2;

        else                            /* or just one */

            ulen += 2;

    }

    ulen += 2;  /* for trailing UTF16 zero */

    if ((ret = OPENSSL_malloc(ulen)) == NULL)

        return NULL;

    /* re-run the loop writing down UTF-16 characters in big-endian order */

    for (unitmp = ret, i = 0; i < asclen; i += j) {

        j = UTF8_getc((const unsigned char *)asc+i, asclen-i, &utf32chr);

        if (utf32chr >= 0x10000) {      /* pair if UTF-16 characters */

            unsigned int hi, lo;

            utf32chr -= 0x10000;

            hi = 0xD800 + (utf32chr>>10);

            lo = 0xDC00 + (utf32chr&0x3ff);

            *unitmp++ = (unsigned char)(hi>>8);

            *unitmp++ = (unsigned char)(hi);

            *unitmp++ = (unsigned char)(lo>>8);

            *unitmp++ = (unsigned char)(lo);

        } else {                        /* or just one */

            *unitmp++ = (unsigned char)(utf32chr>>8);

            *unitmp++ = (unsigned char)(utf32chr);

        }

    }

    /* Make result double null terminated */

    *unitmp++ = 0;

    *unitmp++ = 0;

    if (unilen)

        *unilen = ulen;

    if (uni)

        *uni = ret;

    return ret;

}

static int bmp_to_utf8(char *str, const unsigned char *utf16, int len)

{

    unsigned long utf32chr;

    if (len == 0) return 0;

    if (len < 2) return -1;

    /* pull UTF-16 character in big-endian order */

    utf32chr = (utf16[0]<<8) | utf16[1];

    if (utf32chr >= 0xD800 && utf32chr < 0xE000) {   /* two chars */

        unsigned int lo;

        if (len < 4) return -1;

        utf32chr -= 0xD800;

        utf32chr <<= 10;

        lo = (utf16[2]<<8) | utf16[3];

        if (lo < 0xDC00 || lo >= 0xE000) return -1;

        utf32chr |= lo-0xDC00;

        utf32chr += 0x10000;

    }

    return UTF8_putc((unsigned char *)str, len > 4 ? 4 : len, utf32chr);

}

char *OPENSSL_uni2utf8(const unsigned char *uni, int unilen)

{

    int asclen, i, j;

    char *asctmp;

    /* string must contain an even number of bytes */

    if (unilen & 1)

        return NULL;

    for (asclen = 0, i = 0; i < unilen; ) {

        j = bmp_to_utf8(NULL, uni+i, unilen-i);

        /*

         * falling back to OPENSSL_uni2asc makes lesser sense [than

         * falling back to OPENSSL_asc2uni in OPENSSL_utf82uni above],

         * it's done rather to maintain symmetry...

         */

        if (j < 0) return OPENSSL_uni2asc(uni, unilen);

        if (j == 4) i += 4;

        else        i += 2;

        asclen += j;

    }

    /* If no terminating zero allow for one */

    if (!unilen || (uni[unilen-2]||uni[unilen - 1]))

        asclen++;

    if ((asctmp = OPENSSL_malloc(asclen)) == NULL)

        return NULL;

    /* re-run the loop emitting UTF-8 string */

    for (asclen = 0, i = 0; i < unilen; ) {

        j = bmp_to_utf8(asctmp+asclen, uni+i, unilen-i);

        if (j == 4) i += 4;

        else        i += 2;

        asclen += j;

    }

    /* If no terminating zero write one */

    if (!unilen || (uni[unilen-2]||uni[unilen - 1]))

        asctmp[asclen] = '\0';

    return asctmp;

}

int i2d_PKCS12_bio(BIO *bp, const PKCS12 *p12)

{

    return ASN1_item_i2d_bio(ASN1_ITEM_rptr(PKCS12), bp, p12);

}

#ifndef OPENSSL_NO_STDIO

int i2d_PKCS12_fp(FILE *fp, const PKCS12 *p12)

{

    return ASN1_item_i2d_fp(ASN1_ITEM_rptr(PKCS12), fp, p12);

}

#endif

PKCS12 *d2i_PKCS12_bio(BIO *bp, PKCS12 **p12)

{

    OSSL_LIB_CTX *libctx = NULL;

    const char *propq = NULL;

    const PKCS7_CTX *p7ctx = NULL;

    if (p12 != NULL) {

        p7ctx = ossl_pkcs12_get0_pkcs7ctx(*p12);

        if (p7ctx != NULL) {

            libctx = ossl_pkcs7_ctx_get0_libctx(p7ctx);

            propq = ossl_pkcs7_ctx_get0_propq(p7ctx);

        }

    }

    return ASN1_item_d2i_bio_ex(ASN1_ITEM_rptr(PKCS12), bp, p12, libctx, propq);

}

#ifndef OPENSSL_NO_STDIO

PKCS12 *d2i_PKCS12_fp(FILE *fp, PKCS12 **p12)

{

    OSSL_LIB_CTX *libctx = NULL;

    const char *propq = NULL;

    const PKCS7_CTX *p7ctx = NULL;

    if (p12 != NULL) {

        p7ctx = ossl_pkcs12_get0_pkcs7ctx(*p12);

        if (p7ctx != NULL) {

            libctx = ossl_pkcs7_ctx_get0_libctx(p7ctx);

            propq = ossl_pkcs7_ctx_get0_propq(p7ctx);

        }

    }

    return ASN1_item_d2i_fp_ex(ASN1_ITEM_rptr(PKCS12), fp, p12, libctx, propq);

}

#endif