mirror of https://github.com/openssl/openssl.git
361 lines
8.7 KiB
C
361 lines
8.7 KiB
C
/*
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* Copyright 2003-2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "internal/e_os.h"
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#include <string.h>
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#include <limits.h>
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#include <openssl/crypto.h>
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#include "crypto/ctype.h"
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#include "internal/cryptlib.h"
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#include "internal/thread_once.h"
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#define DEFAULT_SEPARATOR ':'
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#define CH_ZERO '\0'
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char *CRYPTO_strdup(const char *str, const char* file, int line)
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{
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char *ret;
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if (str == NULL)
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return NULL;
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ret = CRYPTO_malloc(strlen(str) + 1, file, line);
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if (ret != NULL)
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strcpy(ret, str);
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return ret;
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}
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char *CRYPTO_strndup(const char *str, size_t s, const char* file, int line)
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{
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size_t maxlen;
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char *ret;
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if (str == NULL)
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return NULL;
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maxlen = OPENSSL_strnlen(str, s);
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ret = CRYPTO_malloc(maxlen + 1, file, line);
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if (ret) {
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memcpy(ret, str, maxlen);
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ret[maxlen] = CH_ZERO;
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}
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return ret;
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}
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void *CRYPTO_memdup(const void *data, size_t siz, const char* file, int line)
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{
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void *ret;
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if (data == NULL || siz >= INT_MAX)
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return NULL;
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ret = CRYPTO_malloc(siz, file, line);
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if (ret == NULL)
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return NULL;
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return memcpy(ret, data, siz);
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}
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size_t OPENSSL_strnlen(const char *str, size_t maxlen)
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{
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const char *p;
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for (p = str; maxlen-- != 0 && *p != CH_ZERO; ++p) ;
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return p - str;
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}
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size_t OPENSSL_strlcpy(char *dst, const char *src, size_t size)
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{
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size_t l = 0;
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for (; size > 1 && *src; size--) {
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*dst++ = *src++;
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l++;
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}
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if (size)
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*dst = CH_ZERO;
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return l + strlen(src);
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}
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size_t OPENSSL_strlcat(char *dst, const char *src, size_t size)
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{
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size_t l = 0;
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for (; size > 0 && *dst; size--, dst++)
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l++;
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return l + OPENSSL_strlcpy(dst, src, size);
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}
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int OPENSSL_hexchar2int(unsigned char c)
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{
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#ifdef CHARSET_EBCDIC
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c = os_toebcdic[c];
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#endif
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switch (c) {
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case '0':
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return 0;
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case '1':
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return 1;
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case '2':
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return 2;
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case '3':
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return 3;
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case '4':
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return 4;
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case '5':
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return 5;
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case '6':
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return 6;
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case '7':
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return 7;
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case '8':
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return 8;
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case '9':
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return 9;
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case 'a': case 'A':
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return 0x0A;
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case 'b': case 'B':
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return 0x0B;
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case 'c': case 'C':
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return 0x0C;
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case 'd': case 'D':
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return 0x0D;
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case 'e': case 'E':
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return 0x0E;
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case 'f': case 'F':
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return 0x0F;
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}
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return -1;
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}
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static int hexstr2buf_sep(unsigned char *buf, size_t buf_n, size_t *buflen,
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const char *str, const char sep)
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{
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unsigned char *q;
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unsigned char ch, cl;
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int chi, cli;
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const unsigned char *p;
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size_t cnt;
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for (p = (const unsigned char *)str, q = buf, cnt = 0; *p; ) {
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ch = *p++;
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/* A separator of CH_ZERO means there is no separator */
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if (ch == sep && sep != CH_ZERO)
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continue;
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cl = *p++;
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if (!cl) {
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ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ODD_NUMBER_OF_DIGITS);
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return 0;
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}
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cli = OPENSSL_hexchar2int(cl);
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chi = OPENSSL_hexchar2int(ch);
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if (cli < 0 || chi < 0) {
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ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ILLEGAL_HEX_DIGIT);
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return 0;
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}
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cnt++;
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if (q != NULL) {
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if (cnt > buf_n) {
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ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
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return 0;
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}
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*q++ = (unsigned char)((chi << 4) | cli);
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}
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}
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if (buflen != NULL)
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*buflen = cnt;
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return 1;
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}
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/*
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* Given a string of hex digits convert to a buffer
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*/
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int OPENSSL_hexstr2buf_ex(unsigned char *buf, size_t buf_n, size_t *buflen,
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const char *str, const char sep)
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{
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return hexstr2buf_sep(buf, buf_n, buflen, str, sep);
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}
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unsigned char *ossl_hexstr2buf_sep(const char *str, long *buflen,
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const char sep)
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{
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unsigned char *buf;
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size_t buf_n, tmp_buflen;
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buf_n = strlen(str);
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if (buf_n <= 1) {
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ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_HEX_STRING_TOO_SHORT);
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return NULL;
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}
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buf_n /= 2;
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if ((buf = OPENSSL_malloc(buf_n)) == NULL)
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return NULL;
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if (buflen != NULL)
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*buflen = 0;
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tmp_buflen = 0;
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if (hexstr2buf_sep(buf, buf_n, &tmp_buflen, str, sep)) {
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if (buflen != NULL)
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*buflen = (long)tmp_buflen;
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return buf;
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}
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OPENSSL_free(buf);
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return NULL;
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}
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unsigned char *OPENSSL_hexstr2buf(const char *str, long *buflen)
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{
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return ossl_hexstr2buf_sep(str, buflen, DEFAULT_SEPARATOR);
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}
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static int buf2hexstr_sep(char *str, size_t str_n, size_t *strlength,
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const unsigned char *buf, size_t buflen,
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const char sep)
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{
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static const char hexdig[] = "0123456789ABCDEF";
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const unsigned char *p;
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char *q;
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size_t i;
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int has_sep = (sep != CH_ZERO);
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size_t len = has_sep ? buflen * 3 : 1 + buflen * 2;
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if (strlength != NULL)
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*strlength = len;
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if (str == NULL)
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return 1;
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if (str_n < (unsigned long)len) {
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ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
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return 0;
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}
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q = str;
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for (i = 0, p = buf; i < buflen; i++, p++) {
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*q++ = hexdig[(*p >> 4) & 0xf];
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*q++ = hexdig[*p & 0xf];
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if (has_sep)
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*q++ = sep;
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}
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if (has_sep)
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--q;
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*q = CH_ZERO;
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#ifdef CHARSET_EBCDIC
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ebcdic2ascii(str, str, q - str - 1);
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#endif
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return 1;
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}
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int OPENSSL_buf2hexstr_ex(char *str, size_t str_n, size_t *strlength,
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const unsigned char *buf, size_t buflen,
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const char sep)
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{
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return buf2hexstr_sep(str, str_n, strlength, buf, buflen, sep);
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}
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char *ossl_buf2hexstr_sep(const unsigned char *buf, long buflen, char sep)
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{
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char *tmp;
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size_t tmp_n;
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if (buflen == 0)
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return OPENSSL_zalloc(1);
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tmp_n = (sep != CH_ZERO) ? buflen * 3 : 1 + buflen * 2;
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if ((tmp = OPENSSL_malloc(tmp_n)) == NULL)
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return NULL;
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if (buf2hexstr_sep(tmp, tmp_n, NULL, buf, buflen, sep))
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return tmp;
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OPENSSL_free(tmp);
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return NULL;
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}
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/*
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* Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
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* hex representation @@@ (Contents of buffer are always kept in ASCII, also
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* on EBCDIC machines)
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*/
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char *OPENSSL_buf2hexstr(const unsigned char *buf, long buflen)
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{
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return ossl_buf2hexstr_sep(buf, buflen, ':');
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}
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int openssl_strerror_r(int errnum, char *buf, size_t buflen)
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{
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#if defined(_MSC_VER) && _MSC_VER>=1400 && !defined(_WIN32_WCE)
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return !strerror_s(buf, buflen, errnum);
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#elif defined(_GNU_SOURCE)
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char *err;
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/*
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* GNU strerror_r may not actually set buf.
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* It can return a pointer to some (immutable) static string in which case
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* buf is left unused.
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*/
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err = strerror_r(errnum, buf, buflen);
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if (err == NULL || buflen == 0)
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return 0;
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/*
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* If err is statically allocated, err != buf and we need to copy the data.
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* If err points somewhere inside buf, OPENSSL_strlcpy can handle this,
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* since src and dest are not annotated with __restrict and the function
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* reads src byte for byte and writes to dest.
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* If err == buf we do not have to copy anything.
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*/
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if (err != buf)
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OPENSSL_strlcpy(buf, err, buflen);
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return 1;
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#elif (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \
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(defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
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/*
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* We can use "real" strerror_r. The OpenSSL version differs in that it
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* gives 1 on success and 0 on failure for consistency with other OpenSSL
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* functions. Real strerror_r does it the other way around
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*/
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return !strerror_r(errnum, buf, buflen);
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#else
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char *err;
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/* Fall back to non-thread safe strerror()...its all we can do */
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if (buflen < 2)
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return 0;
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err = strerror(errnum);
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/* Can this ever happen? */
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if (err == NULL)
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return 0;
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OPENSSL_strlcpy(buf, err, buflen);
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return 1;
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#endif
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}
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int OPENSSL_strcasecmp(const char *s1, const char *s2)
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{
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int t;
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while ((t = ossl_tolower(*s1) - ossl_tolower(*s2++)) == 0)
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if (*s1++ == '\0')
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return 0;
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return t;
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}
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int OPENSSL_strncasecmp(const char *s1, const char *s2, size_t n)
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{
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int t;
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size_t i;
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for (i = 0; i < n; i++)
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if ((t = ossl_tolower(*s1) - ossl_tolower(*s2++)) != 0)
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return t;
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else if (*s1++ == '\0')
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return 0;
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return 0;
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}
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