/src/wolfssl-sp-math/src/ssl_misc.c

Source
/* ssl_misc.c
 *
 * Copyright (C) 2006-2025 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
 */

#include <wolfssl/wolfcrypt/libwolfssl_sources.h>

#if !defined(WOLFSSL_SSL_MISC_INCLUDED)
    #ifndef WOLFSSL_IGNORE_FILE_WARN
        #warning ssl_misc.c does not need to be compiled separately from ssl.c
    #endif
#else

#if defined(OPENSSL_EXTRA) && !defined(WOLFCRYPT_ONLY)
#ifndef NO_BIO

/* Amount of memory to allocate/add. */
#define READ_BIO_FILE_CHUNK     128

/* Read a file in chunks.
 *
 * Allocates a chunk and reads into it until it is full.
 *
 * @param [in, out] bio   BIO object to read with.
 * @param [out]     data  Read data in a new buffer.
 * @return  Negative on error.
 * @return  Number of bytes read on success.
 */
static int wolfssl_read_bio_file(WOLFSSL_BIO* bio, char** data)
{
    int ret = 0;
    char* mem;
    char* p;

    /* Allocate buffer to hold a chunk of data. */
    mem = (char*)XMALLOC(READ_BIO_FILE_CHUNK, NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (mem == NULL) {
        WOLFSSL_ERROR_MSG("Memory allocation error");
        ret = MEMORY_E;
    }

    if (ret == 0) {
        int sz;

        /* ret is the number of bytes read and is zero. */

        /* p is where to read in next chunk. */
        p = mem;
        /* Memory available to read into is one chunk. */
        sz = READ_BIO_FILE_CHUNK;
        /* Keep reading in chunks until no more or an error. */
        while ((sz = wolfSSL_BIO_read(bio, p, sz)) > 0) {
            int remaining;

            /* Update total read. */
            ret += sz;
            /* Calculate remaining unused memory. */
            remaining = READ_BIO_FILE_CHUNK - (ret % READ_BIO_FILE_CHUNK);
            /* Check for space remaining. */
            if (remaining != READ_BIO_FILE_CHUNK) {
                /* Update where data is read into. */
                p += sz;
                /* Maximum possible size is the remaining buffer size. */
                sz = remaining;
            }
            else {
                /* No space left for more data to be read - add a chunk. */
            #ifdef WOLFSSL_NO_REALLOC
                p = (char*)XMALLOC(ret + READ_BIO_FILE_CHUNK, NULL,
                    DYNAMIC_TYPE_TMP_BUFFER);
                if (p != NULL) {
                    XMEMCPY(p, mem, ret);
                    XFREE(mem, NULL, DYNAMIC_TYPE_TMP_BUFFER);
                    mem = NULL;
                }
            #else
                p = (char*)XREALLOC(mem, ret + READ_BIO_FILE_CHUNK, NULL,
                    DYNAMIC_TYPE_TMP_BUFFER);
            #endif
                if (p == NULL) {
                    sz = MEMORY_E;
                    break;
                }

                /* Set mem to new pointer. */
                mem = p;
                /* Set p to where to read in next chunk. */
                p += ret;
                /* Read in a new chunk. */
                sz = READ_BIO_FILE_CHUNK;
            }
        }
        if ((sz < 0) || (ret == 0)) {
            /* Dispose of memory on error or no data read. */
            XFREE(mem, NULL, DYNAMIC_TYPE_TMP_BUFFER);
            mem = NULL;
            /* Return error. */
            ret = sz;
        }
    }

    *data = mem;
    return ret;
}

/* Read exactly the required amount into a newly allocated buffer.
 *
 * @param [in, out] bio   BIO object to read with.
 * @param [in       sz    Amount of data to read.
 * @param [out]     data  Read data in a new buffer.
 * @return  Negative on error.
 * @return  Number of bytes read on success.
 */
static int wolfssl_read_bio_len(WOLFSSL_BIO* bio, int sz, char** data)
{
    int ret = 0;
    char* mem;

    /* Allocate buffer to hold data. */
    mem = (char*)XMALLOC((size_t)sz, NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (mem == NULL) {
        WOLFSSL_ERROR_MSG("Memory allocation error");
        ret = MEMORY_E;
    }
    else if ((ret = wolfSSL_BIO_read(bio, mem, sz)) != sz) {
        /* Pending data not read. */
        XFREE(mem, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        mem = NULL;
        ret = MEMORY_E;
    }

    *data = mem;
    return ret;
}

/* Read all the data from a BIO.
 *
 * @param [in, out] bio         BIO object to read with.
 * @param [out]     data        Read data in a buffer.
 * @param [out]     dataSz      Amount of data read in bytes.
 * @param [out]     memAlloced  Indicates whether return buffer was allocated.
 * @return  Negative on error.
 * @return  0 on success.
 */
static int wolfssl_read_bio(WOLFSSL_BIO* bio, char** data, int* dataSz,
    int* memAlloced)
{
    int ret;
    int sz;

    if (bio->type == WOLFSSL_BIO_MEMORY) {
        ret = wolfSSL_BIO_get_mem_data(bio, data);
        if (ret > 0) {
            /* Advance the write index in the memory bio */
            WOLFSSL_BIO* mem_bio = bio;
            for (; mem_bio != NULL; mem_bio = mem_bio->next) {
                if (mem_bio->type == WOLFSSL_BIO_MEMORY)
                    break;
            }
            if (mem_bio == NULL)
                mem_bio = bio; /* Default to input */
            mem_bio->rdIdx += ret;
        }
        *memAlloced = 0;
    }
    /* Get pending or, when a file BIO, get length of file. */
    else if ((sz = wolfSSL_BIO_pending(bio)) > 0) {
        ret = wolfssl_read_bio_len(bio, sz, data);
        if (ret > 0) {
            *memAlloced = 1;
        }
    }
    else if (bio->type == WOLFSSL_BIO_FILE) {
        ret = wolfssl_read_bio_file(bio, data);
        if (ret > 0) {
            *memAlloced = 1;
        }
    }
    else {
        WOLFSSL_ERROR_MSG("No data read from bio");
        *memAlloced = 0;
        ret = NOT_COMPILED_IN;
    }

    if (ret >= 0) {
        *dataSz = ret;
        ret = 0;
    }

    return ret;
}
#endif /* !NO_BIO */
#endif /* OPENSSL_EXTRA && !WOLFCRYPT_ONLY */

#if (defined(OPENSSL_EXTRA) || defined(PERSIST_CERT_CACHE) || \
     !defined(NO_CERTS)) && !defined(WOLFCRYPT_ONLY) && !defined(NO_FILESYSTEM)
/* Read all the data from a file.
 *
 * @param [in]  fp          File pointer to read with.
 * @param [out] fileSz      Amount of data remaining in file in bytes.
 * @return  WOLFSSL_BAD_FILE on error.
 * @return  0 on success.
 */
static int wolfssl_file_len(XFILE fp, long* fileSz)
{
    int ret = 0;
    long sz = 0;
    long curr = 0;

    if (fp == XBADFILE) {
        ret = WOLFSSL_BAD_FILE;
    }
    if (ret == 0) {
        /* Get file offset at end of file. */
        curr = (long)XFTELL(fp);
        if (curr < 0) {
            ret = WOLFSSL_BAD_FILE;
        }
    }
    /* Move to end of file. */
    if ((ret == 0) && (XFSEEK(fp, 0, SEEK_END) != 0)) {
        ret = WOLFSSL_BAD_FILE;
    }
    if (ret == 0) {
        /* Get file offset at end of file and subtract current offset. */
        sz = (long)XFTELL(fp) - curr;
        if (sz < 0) {
            ret = WOLFSSL_BAD_FILE;
        }
    }
    /* Go back to original offset in file. */
    if ((ret == 0) && (XFSEEK(fp, curr, SEEK_SET) != 0)) {
        ret = WOLFSSL_BAD_FILE;
    }
    /* Validate size. */
    if ((ret == 0) && ((sz > MAX_WOLFSSL_FILE_SIZE) || (sz <= 0L))) {
        ret = WOLFSSL_BAD_FILE;
    }
    if (ret == 0) {
        *fileSz = sz;
    }

    return ret;
}
#endif

#if (defined(OPENSSL_EXTRA) || defined(PERSIST_CERT_CACHE)) && \
    !defined(WOLFCRYPT_ONLY) && !defined(NO_FILESYSTEM)
/* Read all the data from a file.
 *
 * @param [in]  fp          File pointer to read with.
 * @param [out] data        Read data in an allocated buffer.
 * @param [out] dataSz      Amount of data read in bytes.
 * @return  WOLFSSL_BAD_FILE when reading fails.
 * @return  MEMORY_E when memory allocation fails.
 * @return  0 on success.
 */
static int wolfssl_read_file(XFILE fp, char** data, int* dataSz)
{
    int ret = 0;
    long sz = 0;
    char* mem = NULL;

    ret = wolfssl_file_len(fp, &sz);
    if (ret == 0) {
        /* Allocate memory big enough to hold whole file. */
        mem = (char*)XMALLOC((size_t)sz, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        if (mem == NULL) {
            ret = MEMORY_E;
        }
    }
    /* Read whole file into new buffer. */
    if ((ret == 0) && ((int)XFREAD(mem, 1, (size_t)sz, fp) != sz)) {
        ret = WOLFSSL_BAD_FILE;
    }
    if (ret == 0) {
        *dataSz = (int)sz;
        *data = mem;
        mem = NULL;
    }

    XFREE(mem, NULL, DYNAMIC_TYPE_TMP_BUFFER);
    return ret;
}
#endif /* (OPENSSL_EXTRA || PERSIST_CERT_CACHE) && !WOLFCRYPT_ONLY &&
        * !NO_FILESYSTEM */

#if !defined(WOLFCRYPT_ONLY) && !defined(NO_CERTS)

#ifdef WOLFSSL_SMALL_STACK

/* Buffer and size with no stack buffer. */
typedef struct {
    /* Dynamically allocated buffer. */
    byte* buffer;
    /* Size of buffer in bytes. */
    word32 sz;
} StaticBuffer;

/* Initialize static buffer.
 *
 * @param [in, out] sb  Static buffer.
 */
static void static_buffer_init(StaticBuffer* sb)
{
    sb->buffer = NULL;
    sb->sz = 0;
}

/* Set the size of the buffer.
 *
 * Can only set size once.
 *
 * @param [in] sb    Static buffer.
 * @param [in] len   Length required.
 * @param [in] heap  Dynamic memory allocation hint.
 * @param [in] type  Type of dynamic memory.
 * @return  0 on success.
 * @return  MEMORY_E when dynamic memory allocation fails.
 */
static int static_buffer_set_size(StaticBuffer* sb, word32 len, void* heap,
    int type)
{
    int ret = 0;

    (void)heap;
    (void)type;

    sb->buffer = (byte*)XMALLOC(len, heap, type);
    if (sb->buffer == NULL) {
        ret = MEMORY_E;
    }
    else {
        sb->sz = len;
    }

    return ret;
}

/* Dispose of dynamically allocated buffer.
 *
 * @param [in] sb    Static buffer.
 * @param [in] heap  Dynamic memory allocation hint.
 * @param [in] type  Type of dynamic memory.
 */
static void static_buffer_free(StaticBuffer* sb, void* heap, int type)
{
    (void)heap;
    (void)type;
    XFREE(sb->buffer, heap, type);
}

#else

/* Buffer and size with stack buffer set and option to dynamically allocate. */
typedef struct {
    /* Stack or heap buffer. */
    byte* buffer;
    /* Size of buffer in bytes. */
    word32 sz;
    /* Indicates whether the buffer was dynamically allocated. */
    int dyn;
} StaticBuffer;

/* Initialize static buffer.
 *
 * @param [in, out] sb           Static buffer.
 * @param [in]      stackBuffer  Buffer allocated on the stack.
 * @param [in]      len          Length of stack buffer.
 */
static void static_buffer_init(StaticBuffer* sb, byte* stackBuffer, word32 len)
{
    sb->buffer = stackBuffer;
    sb->sz = len;
    sb->dyn = 0;
}

/* Set the size of the buffer.
 *
 * Pre: Buffer on the stack set with its size.
 * Can only set size once.
 *
 * @param [in] sb    Static buffer.
 * @param [in] len   Length required.
 * @param [in] heap  Dynamic memory allocation hint.
 * @param [in] type  Type of dynamic memory.
 * @return  0 on success.
 * @return  MEMORY_E when dynamic memory allocation fails.
 */
static int static_buffer_set_size(StaticBuffer* sb, word32 len, void* heap,
    int type)
{
    int ret = 0;

    (void)heap;
    (void)type;

    if (len > sb->sz) {
        byte* buff = (byte*)XMALLOC(len, heap, type);
        if (buff == NULL) {
            ret = MEMORY_E;
        }
        else {
            sb->buffer = buff;
            sb->sz = len;
            sb->dyn = 1;
        }
    }

    return ret;
}

/* Dispose of dynamically allocated buffer.
 *
 * @param [in] sb    Static buffer.
 * @param [in] heap  Dynamic memory allocation hint.
 * @param [in] type  Type of dynamic memory.
 */
static void static_buffer_free(StaticBuffer* sb, void* heap, int type)
{
    (void)heap;
    (void)type;

    if (sb->dyn) {
        XFREE(sb->buffer, heap, type);
    }
}

#endif /* WOLFSSL_SMALL_STACK */

#ifndef NO_FILESYSTEM

/* Read all the data from a file into content.
 *
 * @param [in]      fname    File pointer to read with.
 * @param [in, out] content  Read data in an allocated buffer.
 * @param [in]      heap     Dynamic memory allocation hint.
 * @param [in]      type     Type of dynamic memory.
 * @param [out]     size     Amount of data read in bytes.
 * @return  0 on success.
 * @return  WOLFSSL_BAD_FILE when reading fails.
 * @return  MEMORY_E when memory allocation fails.
 */
static int wolfssl_read_file_static(const char* fname, StaticBuffer* content,
    void* heap, int type, long* size)
{
    int ret = 0;
    XFILE file = XBADFILE;
    long sz = 0;

    /* Check filename is usable. */
    if (fname == NULL) {
        ret = WOLFSSL_BAD_FILE;
    }
    /* Open file for reading. */
    if ((ret == 0) && ((file = XFOPEN(fname, "rb")) == XBADFILE)) {
        ret = WOLFSSL_BAD_FILE;
    }
    if (ret == 0) {
        /* Get length of file. */
        ret = wolfssl_file_len(file, &sz);
    }
    if (ret == 0) {
        /* Set the buffer to be big enough to hold all data. */
        ret = static_buffer_set_size(content, (word32)sz, heap, type);
    }
    /* Read data from file. */
    if ((ret == 0) && ((size_t)XFREAD(content->buffer, 1, (size_t)sz, file) !=
            (size_t)sz)) {
        ret = WOLFSSL_BAD_FILE;
    }

    /* Close file if opened. */
    if (file != XBADFILE) {
        XFCLOSE(file);
    }
    /* Return size read. */
    *size = sz;
    return ret;
}

#endif /* !NO_FILESYSTEM */

#endif /* !WOLFCRYPT_ONLY && !NO_CERTS */

#endif /* !WOLFSSL_SSL_MISC_INCLUDED */


Coverage Report

Created: 2026-02-14 07:18

Line	Count	Source
1		/* ssl_misc.c
2		*
3		* Copyright (C) 2006-2025 wolfSSL Inc.
4		*
5		* This file is part of wolfSSL.
6		*
7		* wolfSSL is free software; you can redistribute it and/or modify
8		* it under the terms of the GNU General Public License as published by
9		* the Free Software Foundation; either version 3 of the License, or
10		* (at your option) any later version.
11		*
12		* wolfSSL is distributed in the hope that it will be useful,
13		* but WITHOUT ANY WARRANTY; without even the implied warranty of
14		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15		* GNU General Public License for more details.
16		*
17		* You should have received a copy of the GNU General Public License
18		* along with this program; if not, write to the Free Software
19		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
20		*/
21
22		#include <wolfssl/wolfcrypt/libwolfssl_sources.h>
23
24		#if !defined(WOLFSSL_SSL_MISC_INCLUDED)
25		#ifndef WOLFSSL_IGNORE_FILE_WARN
26		#warning ssl_misc.c does not need to be compiled separately from ssl.c
27		#endif
28		#else
29
30		#if defined(OPENSSL_EXTRA) && !defined(WOLFCRYPT_ONLY)
31		#ifndef NO_BIO
32
33		/* Amount of memory to allocate/add. */
34		#define READ_BIO_FILE_CHUNK 128
35
36		/* Read a file in chunks.
37		*
38		* Allocates a chunk and reads into it until it is full.
39		*
40		* @param [in, out] bio BIO object to read with.
41		* @param [out] data Read data in a new buffer.
42		* @return Negative on error.
43		* @return Number of bytes read on success.
44		*/
45		static int wolfssl_read_bio_file(WOLFSSL_BIO* bio, char** data)
46		{
47		int ret = 0;
48		char* mem;
49		char* p;
50
51		/* Allocate buffer to hold a chunk of data. */
52		mem = (char*)XMALLOC(READ_BIO_FILE_CHUNK, NULL, DYNAMIC_TYPE_TMP_BUFFER);
53		if (mem == NULL) {
54		WOLFSSL_ERROR_MSG("Memory allocation error");
55		ret = MEMORY_E;
56		}
57
58		if (ret == 0) {
59		int sz;
60
61		/* ret is the number of bytes read and is zero. */
62
63		/* p is where to read in next chunk. */
64		p = mem;
65		/* Memory available to read into is one chunk. */
66		sz = READ_BIO_FILE_CHUNK;
67		/* Keep reading in chunks until no more or an error. */
68		while ((sz = wolfSSL_BIO_read(bio, p, sz)) > 0) {
69		int remaining;
70
71		/* Update total read. */
72		ret += sz;
73		/* Calculate remaining unused memory. */
74		remaining = READ_BIO_FILE_CHUNK - (ret % READ_BIO_FILE_CHUNK);
75		/* Check for space remaining. */
76		if (remaining != READ_BIO_FILE_CHUNK) {
77		/* Update where data is read into. */
78		p += sz;
79		/* Maximum possible size is the remaining buffer size. */
80		sz = remaining;
81		}
82		else {
83		/* No space left for more data to be read - add a chunk. */
84		#ifdef WOLFSSL_NO_REALLOC
85		p = (char*)XMALLOC(ret + READ_BIO_FILE_CHUNK, NULL,
86		DYNAMIC_TYPE_TMP_BUFFER);
87		if (p != NULL) {
88		XMEMCPY(p, mem, ret);
89		XFREE(mem, NULL, DYNAMIC_TYPE_TMP_BUFFER);
90		mem = NULL;
91		}
92		#else
93		p = (char*)XREALLOC(mem, ret + READ_BIO_FILE_CHUNK, NULL,
94		DYNAMIC_TYPE_TMP_BUFFER);
95		#endif
96		if (p == NULL) {
97		sz = MEMORY_E;
98		break;
99		}
100
101		/* Set mem to new pointer. */
102		mem = p;
103		/* Set p to where to read in next chunk. */
104		p += ret;
105		/* Read in a new chunk. */
106		sz = READ_BIO_FILE_CHUNK;
107		}
108		}
109		if ((sz < 0) \|\| (ret == 0)) {
110		/* Dispose of memory on error or no data read. */
111		XFREE(mem, NULL, DYNAMIC_TYPE_TMP_BUFFER);
112		mem = NULL;
113		/* Return error. */
114		ret = sz;
115		}
116		}
117
118		*data = mem;
119		return ret;
120		}
121
122		/* Read exactly the required amount into a newly allocated buffer.
123		*
124		* @param [in, out] bio BIO object to read with.
125		* @param [in sz Amount of data to read.
126		* @param [out] data Read data in a new buffer.
127		* @return Negative on error.
128		* @return Number of bytes read on success.
129		*/
130		static int wolfssl_read_bio_len(WOLFSSL_BIO* bio, int sz, char** data)
131		{
132		int ret = 0;
133		char* mem;
134
135		/* Allocate buffer to hold data. */
136		mem = (char*)XMALLOC((size_t)sz, NULL, DYNAMIC_TYPE_TMP_BUFFER);
137		if (mem == NULL) {
138		WOLFSSL_ERROR_MSG("Memory allocation error");
139		ret = MEMORY_E;
140		}
141		else if ((ret = wolfSSL_BIO_read(bio, mem, sz)) != sz) {
142		/* Pending data not read. */
143		XFREE(mem, NULL, DYNAMIC_TYPE_TMP_BUFFER);
144		mem = NULL;
145		ret = MEMORY_E;
146		}
147
148		*data = mem;
149		return ret;
150		}
151
152		/* Read all the data from a BIO.
153		*
154		* @param [in, out] bio BIO object to read with.
155		* @param [out] data Read data in a buffer.
156		* @param [out] dataSz Amount of data read in bytes.
157		* @param [out] memAlloced Indicates whether return buffer was allocated.
158		* @return Negative on error.
159		* @return 0 on success.
160		*/
161		static int wolfssl_read_bio(WOLFSSL_BIO* bio, char** data, int* dataSz,
162		int* memAlloced)
163		{
164		int ret;
165		int sz;
166
167		if (bio->type == WOLFSSL_BIO_MEMORY) {
168		ret = wolfSSL_BIO_get_mem_data(bio, data);
169		if (ret > 0) {
170		/* Advance the write index in the memory bio */
171		WOLFSSL_BIO* mem_bio = bio;
172		for (; mem_bio != NULL; mem_bio = mem_bio->next) {
173		if (mem_bio->type == WOLFSSL_BIO_MEMORY)
174		break;
175		}
176		if (mem_bio == NULL)
177		mem_bio = bio; /* Default to input */
178		mem_bio->rdIdx += ret;
179		}
180		*memAlloced = 0;
181		}
182		/* Get pending or, when a file BIO, get length of file. */
183		else if ((sz = wolfSSL_BIO_pending(bio)) > 0) {
184		ret = wolfssl_read_bio_len(bio, sz, data);
185		if (ret > 0) {
186		*memAlloced = 1;
187		}
188		}
189		else if (bio->type == WOLFSSL_BIO_FILE) {
190		ret = wolfssl_read_bio_file(bio, data);
191		if (ret > 0) {
192		*memAlloced = 1;
193		}
194		}
195		else {
196		WOLFSSL_ERROR_MSG("No data read from bio");
197		*memAlloced = 0;
198		ret = NOT_COMPILED_IN;
199		}
200
201		if (ret >= 0) {
202		*dataSz = ret;
203		ret = 0;
204		}
205
206		return ret;
207		}
208		#endif /* !NO_BIO */
209		#endif /* OPENSSL_EXTRA && !WOLFCRYPT_ONLY */
210
211		#if (defined(OPENSSL_EXTRA) \|\| defined(PERSIST_CERT_CACHE) \|\| \
212		!defined(NO_CERTS)) && !defined(WOLFCRYPT_ONLY) && !defined(NO_FILESYSTEM)
213		/* Read all the data from a file.
214		*
215		* @param [in] fp File pointer to read with.
216		* @param [out] fileSz Amount of data remaining in file in bytes.
217		* @return WOLFSSL_BAD_FILE on error.
218		* @return 0 on success.
219		*/
220		static int wolfssl_file_len(XFILE fp, long* fileSz)
221	40	{
222	40	int ret = 0;
223	40	long sz = 0;
224	40	long curr = 0;
225
226	40	if (fp == XBADFILE) {
227	0	ret = WOLFSSL_BAD_FILE;
228	0	}
229	40	if (ret == 0) {
230		/* Get file offset at end of file. */
231	40	curr = (long)XFTELL(fp);
232	40	if (curr < 0) {
233	0	ret = WOLFSSL_BAD_FILE;
234	0	}
235	40	}
236		/* Move to end of file. */
237	40	if ((ret == 0) && (XFSEEK(fp, 0, SEEK_END) != 0)) {
238	0	ret = WOLFSSL_BAD_FILE;
239	0	}
240	40	if (ret == 0) {
241		/* Get file offset at end of file and subtract current offset. */
242	40	sz = (long)XFTELL(fp) - curr;
243	40	if (sz < 0) {
244	0	ret = WOLFSSL_BAD_FILE;
245	0	}
246	40	}
247		/* Go back to original offset in file. */
248	40	if ((ret == 0) && (XFSEEK(fp, curr, SEEK_SET) != 0)) {
249	0	ret = WOLFSSL_BAD_FILE;
250	0	}
251		/* Validate size. */
252	40	if ((ret == 0) && ((sz > MAX_WOLFSSL_FILE_SIZE) \|\| (sz <= 0L))) {
253	0	ret = WOLFSSL_BAD_FILE;
254	0	}
255	40	if (ret == 0) {
256	40	*fileSz = sz;
257	40	}
258
259	40	return ret;
260	40	}
261		#endif
262
263		#if (defined(OPENSSL_EXTRA) \|\| defined(PERSIST_CERT_CACHE)) && \
264		!defined(WOLFCRYPT_ONLY) && !defined(NO_FILESYSTEM)
265		/* Read all the data from a file.
266		*
267		* @param [in] fp File pointer to read with.
268		* @param [out] data Read data in an allocated buffer.
269		* @param [out] dataSz Amount of data read in bytes.
270		* @return WOLFSSL_BAD_FILE when reading fails.
271		* @return MEMORY_E when memory allocation fails.
272		* @return 0 on success.
273		*/
274		static int wolfssl_read_file(XFILE fp, char** data, int* dataSz)
275		{
276		int ret = 0;
277		long sz = 0;
278		char* mem = NULL;
279
280		ret = wolfssl_file_len(fp, &sz);
281		if (ret == 0) {
282		/* Allocate memory big enough to hold whole file. */
283		mem = (char*)XMALLOC((size_t)sz, NULL, DYNAMIC_TYPE_TMP_BUFFER);
284		if (mem == NULL) {
285		ret = MEMORY_E;
286		}
287		}
288		/* Read whole file into new buffer. */
289		if ((ret == 0) && ((int)XFREAD(mem, 1, (size_t)sz, fp) != sz)) {
290		ret = WOLFSSL_BAD_FILE;
291		}
292		if (ret == 0) {
293		*dataSz = (int)sz;
294		*data = mem;
295		mem = NULL;
296		}
297
298		XFREE(mem, NULL, DYNAMIC_TYPE_TMP_BUFFER);
299		return ret;
300		}
301		#endif /* (OPENSSL_EXTRA \|\| PERSIST_CERT_CACHE) && !WOLFCRYPT_ONLY &&
302		* !NO_FILESYSTEM */
303
304		#if !defined(WOLFCRYPT_ONLY) && !defined(NO_CERTS)
305
306		#ifdef WOLFSSL_SMALL_STACK
307
308		/* Buffer and size with no stack buffer. */
309		typedef struct {
310		/* Dynamically allocated buffer. */
311		byte* buffer;
312		/* Size of buffer in bytes. */
313		word32 sz;
314		} StaticBuffer;
315
316		/* Initialize static buffer.
317		*
318		* @param [in, out] sb Static buffer.
319		*/
320		static void static_buffer_init(StaticBuffer* sb)
321	40	{
322	40	sb->buffer = NULL;
323	40	sb->sz = 0;
324	40	}
325
326		/* Set the size of the buffer.
327		*
328		* Can only set size once.
329		*
330		* @param [in] sb Static buffer.
331		* @param [in] len Length required.
332		* @param [in] heap Dynamic memory allocation hint.
333		* @param [in] type Type of dynamic memory.
334		* @return 0 on success.
335		* @return MEMORY_E when dynamic memory allocation fails.
336		*/
337		static int static_buffer_set_size(StaticBuffer* sb, word32 len, void* heap,
338		int type)
339	40	{
340	40	int ret = 0;
341
342	40	(void)heap;
343	40	(void)type;
344
345	40	sb->buffer = (byte*)XMALLOC(len, heap, type);
346	40	if (sb->buffer == NULL) {
347	0	ret = MEMORY_E;
348	0	}
349	40	else {
350	40	sb->sz = len;
351	40	}
352
353	40	return ret;
354	40	}
355
356		/* Dispose of dynamically allocated buffer.
357		*
358		* @param [in] sb Static buffer.
359		* @param [in] heap Dynamic memory allocation hint.
360		* @param [in] type Type of dynamic memory.
361		*/
362		static void static_buffer_free(StaticBuffer* sb, void* heap, int type)
363	40	{
364	40	(void)heap;
365	40	(void)type;
366	40	XFREE(sb->buffer, heap, type);
367	40	}
368
369		#else
370
371		/* Buffer and size with stack buffer set and option to dynamically allocate. */
372		typedef struct {
373		/* Stack or heap buffer. */
374		byte* buffer;
375		/* Size of buffer in bytes. */
376		word32 sz;
377		/* Indicates whether the buffer was dynamically allocated. */
378		int dyn;
379		} StaticBuffer;
380
381		/* Initialize static buffer.
382		*
383		* @param [in, out] sb Static buffer.
384		* @param [in] stackBuffer Buffer allocated on the stack.
385		* @param [in] len Length of stack buffer.
386		*/
387		static void static_buffer_init(StaticBuffer* sb, byte* stackBuffer, word32 len)
388		{
389		sb->buffer = stackBuffer;
390		sb->sz = len;
391		sb->dyn = 0;
392		}
393
394		/* Set the size of the buffer.
395		*
396		* Pre: Buffer on the stack set with its size.
397		* Can only set size once.
398		*
399		* @param [in] sb Static buffer.
400		* @param [in] len Length required.
401		* @param [in] heap Dynamic memory allocation hint.
402		* @param [in] type Type of dynamic memory.
403		* @return 0 on success.
404		* @return MEMORY_E when dynamic memory allocation fails.
405		*/
406		static int static_buffer_set_size(StaticBuffer* sb, word32 len, void* heap,
407		int type)
408		{
409		int ret = 0;
410
411		(void)heap;
412		(void)type;
413
414		if (len > sb->sz) {
415		byte* buff = (byte*)XMALLOC(len, heap, type);
416		if (buff == NULL) {
417		ret = MEMORY_E;
418		}
419		else {
420		sb->buffer = buff;
421		sb->sz = len;
422		sb->dyn = 1;
423		}
424		}
425
426		return ret;
427		}
428
429		/* Dispose of dynamically allocated buffer.
430		*
431		* @param [in] sb Static buffer.
432		* @param [in] heap Dynamic memory allocation hint.
433		* @param [in] type Type of dynamic memory.
434		*/
435		static void static_buffer_free(StaticBuffer* sb, void* heap, int type)
436		{
437		(void)heap;
438		(void)type;
439
440		if (sb->dyn) {
441		XFREE(sb->buffer, heap, type);
442		}
443		}
444
445		#endif /* WOLFSSL_SMALL_STACK */
446
447		#ifndef NO_FILESYSTEM
448
449		/* Read all the data from a file into content.
450		*
451		* @param [in] fname File pointer to read with.
452		* @param [in, out] content Read data in an allocated buffer.
453		* @param [in] heap Dynamic memory allocation hint.
454		* @param [in] type Type of dynamic memory.
455		* @param [out] size Amount of data read in bytes.
456		* @return 0 on success.
457		* @return WOLFSSL_BAD_FILE when reading fails.
458		* @return MEMORY_E when memory allocation fails.
459		*/
460		static int wolfssl_read_file_static(const char* fname, StaticBuffer* content,
461		void* heap, int type, long* size)
462	40	{
463	40	int ret = 0;
464	40	XFILE file = XBADFILE;
465	40	long sz = 0;
466
467		/* Check filename is usable. */
468	40	if (fname == NULL) {
469	0	ret = WOLFSSL_BAD_FILE;
470	0	}
471		/* Open file for reading. */
472	40	if ((ret == 0) && ((file = XFOPEN(fname, "rb")) == XBADFILE)) {
473	0	ret = WOLFSSL_BAD_FILE;
474	0	}
475	40	if (ret == 0) {
476		/* Get length of file. */
477	40	ret = wolfssl_file_len(file, &sz);
478	40	}
479	40	if (ret == 0) {
480		/* Set the buffer to be big enough to hold all data. */
481	40	ret = static_buffer_set_size(content, (word32)sz, heap, type);
482	40	}
483		/* Read data from file. */
484	40	if ((ret == 0) && ((size_t)XFREAD(content->buffer, 1, (size_t)sz, file) !=
485	40	(size_t)sz)) {
486	0	ret = WOLFSSL_BAD_FILE;
487	0	}
488
489		/* Close file if opened. */
490	40	if (file != XBADFILE) {
491	40	XFCLOSE(file);
492	40	}
493		/* Return size read. */
494	40	*size = sz;
495	40	return ret;
496	40	}
497
498		#endif /* !NO_FILESYSTEM */
499
500		#endif /* !WOLFCRYPT_ONLY && !NO_CERTS */
501
502		#endif /* !WOLFSSL_SSL_MISC_INCLUDED */
503