path: root/crypto/o_str.c

/*
 * Copyright 2003-2024 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 "internal/e_os.h"
#include <string.h>
#include <limits.h>
#include <openssl/crypto.h>
#include "crypto/ctype.h"
#include "internal/cryptlib.h"
#include "internal/thread_once.h"

#define DEFAULT_SEPARATOR ':'
#define CH_ZERO '\0'

char *CRYPTO_strdup(const char *str, const char* file, int line)
{
    char *ret;

    if (str == NULL)
        return NULL;
    ret = CRYPTO_malloc(strlen(str) + 1, file, line);
    if (ret != NULL)
        strcpy(ret, str);
    return ret;
}

char *CRYPTO_strndup(const char *str, size_t s, const char* file, int line)
{
    size_t maxlen;
    char *ret;

    if (str == NULL)
        return NULL;

    maxlen = OPENSSL_strnlen(str, s);

    ret = CRYPTO_malloc(maxlen + 1, file, line);
    if (ret) {
        memcpy(ret, str, maxlen);
        ret[maxlen] = CH_ZERO;
    }
    return ret;
}

void *CRYPTO_memdup(const void *data, size_t siz, const char* file, int line)
{
    void *ret;

    if (data == NULL || siz >= INT_MAX)
        return NULL;

    ret = CRYPTO_malloc(siz, file, line);
    if (ret == NULL)
        return NULL;
    return memcpy(ret, data, siz);
}

size_t OPENSSL_strnlen(const char *str, size_t maxlen)
{
    const char *p;

    for (p = str; maxlen-- != 0 && *p != CH_ZERO; ++p) ;

    return p - str;
}

size_t OPENSSL_strlcpy(char *dst, const char *src, size_t size)
{
    size_t l = 0;
    for (; size > 1 && *src; size--) {
        *dst++ = *src++;
        l++;
    }
    if (size)
        *dst = CH_ZERO;
    return l + strlen(src);
}

size_t OPENSSL_strlcat(char *dst, const char *src, size_t size)
{
    size_t l = 0;
    for (; size > 0 && *dst; size--, dst++)
        l++;
    return l + OPENSSL_strlcpy(dst, src, size);
}

int OPENSSL_hexchar2int(unsigned char c)
{
#ifdef CHARSET_EBCDIC
    c = os_toebcdic[c];
#endif

    switch (c) {
    case '0':
        return 0;
    case '1':
        return 1;
    case '2':
        return 2;
    case '3':
        return 3;
    case '4':
          return 4;
    case '5':
          return 5;
    case '6':
          return 6;
    case '7':
          return 7;
    case '8':
          return 8;
    case '9':
          return 9;
    case 'a': case 'A':
          return 0x0A;
    case 'b': case 'B':
          return 0x0B;
    case 'c': case 'C':
          return 0x0C;
    case 'd': case 'D':
          return 0x0D;
    case 'e': case 'E':
          return 0x0E;
    case 'f': case 'F':
          return 0x0F;
    }
    return -1;
}

static int hexstr2buf_sep(unsigned char *buf, size_t buf_n, size_t *buflen,
                          const char *str, const char sep)
{
    unsigned char *q;
    unsigned char ch, cl;
    int chi, cli;
    const unsigned char *p;
    size_t cnt;

    for (p = (const unsigned char *)str, q = buf, cnt = 0; *p; ) {
        ch = *p++;
        /* A separator of CH_ZERO means there is no separator */
        if (ch == sep && sep != CH_ZERO)
            continue;
        cl = *p++;
        if (!cl) {
            ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ODD_NUMBER_OF_DIGITS);
            return 0;
        }
        cli = OPENSSL_hexchar2int(cl);
        chi = OPENSSL_hexchar2int(ch);
        if (cli < 0 || chi < 0) {
            ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ILLEGAL_HEX_DIGIT);
            return 0;
        }
        cnt++;
        if (q != NULL) {
            if (cnt > buf_n) {
                ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
                return 0;
            }
            *q++ = (unsigned char)((chi << 4) | cli);
        }
    }

    if (buflen != NULL)
        *buflen = cnt;
    return 1;
}

/*
 * Given a string of hex digits convert to a buffer
 */
int OPENSSL_hexstr2buf_ex(unsigned char *buf, size_t buf_n, size_t *buflen,
                          const char *str, const char sep)
{
    return hexstr2buf_sep(buf, buf_n, buflen, str, sep);
}

unsigned char *ossl_hexstr2buf_sep(const char *str, long *buflen,
                                   const char sep)
{
    unsigned char *buf;
    size_t buf_n, tmp_buflen;

    buf_n = strlen(str);
    if (buf_n <= 1) {
        ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_HEX_STRING_TOO_SHORT);
        return NULL;
    }
    buf_n /= 2;
    if ((buf = OPENSSL_malloc(buf_n)) == NULL)
        return NULL;

    if (buflen != NULL)
        *buflen = 0;
    tmp_buflen = 0;
    if (hexstr2buf_sep(buf, buf_n, &tmp_buflen, str, sep)) {
        if (buflen != NULL)
            *buflen = (long)tmp_buflen;
        return buf;
    }
    OPENSSL_free(buf);
    return NULL;
}

unsigned char *OPENSSL_hexstr2buf(const char *str, long *buflen)
{
    return ossl_hexstr2buf_sep(str, buflen, DEFAULT_SEPARATOR);
}

static int buf2hexstr_sep(char *str, size_t str_n, size_t *strlength,
                          const unsigned char *buf, size_t buflen,
                          const char sep)
{
    static const char hexdig[] = "0123456789ABCDEF";
    const unsigned char *p;
    char *q;
    size_t i;
    int has_sep = (sep != CH_ZERO);
    size_t len = has_sep ? buflen * 3 : 1 + buflen * 2;

    if (strlength != NULL)
        *strlength = len;
    if (str == NULL)
        return 1;

    if (str_n < (unsigned long)len) {
        ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
        return 0;
    }

    q =