A local copy of OpenSSL from GitHub
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/*
* Copyright 2003-2020 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 "e_os.h"
#include <limits.h>
#include <openssl/crypto.h>
#include "internal/cryptlib.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) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
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 *openssl_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) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
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 openssl_hexstr2buf_sep(str, buflen, DEFAULT_SEPARATOR);
}
static int buf2hexstr_sep(char *str, size_t str_n, size_t *strlen,
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 (strlen != NULL)
*strlen = 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 = str;
for (i = 0, p = buf; i < buflen; i++, p++) {
*q++ = hexdig[(*p >> 4) & 0xf];
*q++ = hexdig[*p & 0xf];
if (has_sep)
*q++ = sep;
}
if (has_sep)
--q;
*q = CH_ZERO;
#ifdef CHARSET_EBCDIC
ebcdic2ascii(str, str, q - str - 1);
#endif
return 1;
}
int OPENSSL_buf2hexstr_ex(char *str, size_t str_n, size_t *strlen,
const unsigned char *buf, size_t buflen,
const char sep)
{
return buf2hexstr_sep(str, str_n, strlen, buf, buflen, sep);
}
char *openssl_buf2hexstr_sep(const unsigned char *buf, long buflen, char sep)
{
char *tmp;
size_t tmp_n;
if (buflen == 0)
return OPENSSL_zalloc(1);
tmp_n = (sep != CH_ZERO) ? buflen * 3 : 1 + buflen * 2;
if ((tmp = OPENSSL_malloc(tmp_n)) == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
return NULL;
}
if (buf2hexstr_sep(tmp, tmp_n, NULL, buf, buflen, sep))
return tmp;
OPENSSL_free(tmp);
return NULL;
}
/*
* Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
* hex representation @@@ (Contents of buffer are always kept in ASCII, also
* on EBCDIC machines)
*/
char *OPENSSL_buf2hexstr(const unsigned char *buf, long buflen)
{
return openssl_buf2hexstr_sep(buf, buflen, ':');
}
int openssl_strerror_r(int errnum, char *buf, size_t buflen)
{
#if defined(_MSC_VER) && _MSC_VER>=1400 && !defined(_WIN32_WCE)
return !strerror_s(buf, buflen, errnum);
#elif defined(_GNU_SOURCE)
char *err;
/*
* GNU strerror_r may not actually set buf.
* It can return a pointer to some (immutable) static string in which case
* buf is left unused.
*/
err = strerror_r(errnum, buf, buflen);
if (err == NULL || buflen == 0)
return 0;
/*
* If err is statically allocated, err != buf and we need to copy the data.
* If err points somewhere inside buf, OPENSSL_strlcpy can handle this,
* since src and dest are not annotated with __restrict and the function
* reads src byte for byte and writes to dest.
* If err == buf we do not have to copy anything.
*/
if (err != buf)
OPENSSL_strlcpy(buf, err, buflen);
return 1;
#elif (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \
(defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
/*
* We can use "real" strerror_r. The OpenSSL version differs in that it
* gives 1 on success and 0 on failure for consistency with other OpenSSL
* functions. Real strerror_r does it the other way around
*/
return !strerror_r(errnum, buf, buflen);
#else
char *err;
/* Fall back to non-thread safe strerror()...its all we can do */
if (buflen < 2)
return 0;
err = strerror(errnum);
/* Can this ever happen? */
if (err == NULL)
return 0;
OPENSSL_strlcpy(buf, err, buflen);
return 1;
#endif
}