crypto/rand/rand_egd.c - third_party/openssl - Git at Google

 /* crypto/rand/rand_egd.c */
 /* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */
 /* ====================================================================
  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *
  * 3. All advertising materials mentioning features or use of this
  *    software must display the following acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    openssl-core@openssl.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com).
  *
  */

 #include <openssl/crypto.h>
 #include <openssl/e_os2.h>
 #include <openssl/rand.h>
 #include <openssl/buffer.h>

 /*
  * Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
  *
  * This module supplies three routines:
  *
  * RAND_query_egd_bytes(path, buf, bytes)
  *   will actually query "bytes" bytes of entropy form the egd-socket located
  *   at path and will write them to buf (if supplied) or will directly feed
  *   it to RAND_seed() if buf==NULL.
  *   The number of bytes is not limited by the maximum chunk size of EGD,
  *   which is 255 bytes. If more than 255 bytes are wanted, several chunks
  *   of entropy bytes are requested. The connection is left open until the
  *   query is competed.
  *   RAND_query_egd_bytes() returns with
  *     -1  if an error occured during connection or communication.
  *     num the number of bytes read from the EGD socket. This number is either
  *         the number of bytes requested or smaller, if the EGD pool is
  *         drained and the daemon signals that the pool is empty.
  *   This routine does not touch any RAND_status(). This is necessary, since
  *   PRNG functions may call it during initialization.
  *
  * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
  *   used to seed the PRNG.
  *   RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
  *   Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
  *   seed status so that the return value can reflect the seed state:
  *     -1  if an error occured during connection or communication _or_
  *         if the PRNG has still not received the required seeding.
  *     num the number of bytes read from the EGD socket. This number is either
  *         the number of bytes requested or smaller, if the EGD pool is
  *         drained and the daemon signals that the pool is empty.
  *
  * RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
  *   the PRNG.
  *   RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
  */

 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE) || defined(OPENSSL_SYS_VOS) || defined(OPENSSL_SYS_BEOS)
 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
 	{
 	return(-1);
 	}
 int RAND_egd(const char *path)
 	{
 	return(-1);
 	}

 int RAND_egd_bytes(const char *path,int bytes)
 	{
 	return(-1);
 	}
 #else
 #include <openssl/opensslconf.h>
 #include OPENSSL_UNISTD
 #include <sys/types.h>
 #include <sys/socket.h>
 #ifndef NO_SYS_UN_H
 # ifdef OPENSSL_SYS_VXWORKS
 #   include <streams/un.h>
 # else
 #   include <sys/un.h>
 # endif
 #else
 struct	sockaddr_un {
 	short	sun_family;		/* AF_UNIX */
 	char	sun_path[108];		/* path name (gag) */
 };
 #endif /* NO_SYS_UN_H */
 #include <string.h>
 #include <errno.h>

 #ifndef offsetof
 #  define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #endif

 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
 	{
 	int ret = 0;
 	struct sockaddr_un addr;
 	int len, num, numbytes;
 	int fd = -1;
 	int success;
 	unsigned char egdbuf[2], tempbuf[255], *retrievebuf;

 	memset(&addr, 0, sizeof(addr));
 	addr.sun_family = AF_UNIX;
 	if (strlen(path) >= sizeof(addr.sun_path))
 		return (-1);
 	BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path);
 	len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
 	fd = socket(AF_UNIX, SOCK_STREAM, 0);
 	if (fd == -1) return (-1);
 	success = 0;
 	while (!success)
 	    {
 	    if (connect(fd, (struct sockaddr *)&addr, len) == 0)
 	       success = 1;
 	    else
 		{
 		switch (errno)
 		    {
 #ifdef EINTR
 		    case EINTR:
 #endif
 #ifdef EAGAIN
 		    case EAGAIN:
 #endif
 #ifdef EINPROGRESS
 		    case EINPROGRESS:
 #endif
 #ifdef EALREADY
 		    case EALREADY:
 #endif
 			/* No error, try again */
 			break;
 #ifdef EISCONN
 		    case EISCONN:
 			success = 1;
 			break;
 #endif
 		    default:
 			goto err;	/* failure */
 		    }
 		}
 	    }

 	while(bytes > 0)
 	    {
 	    egdbuf[0] = 1;
 	    egdbuf[1] = bytes < 255 ? bytes : 255;
 	    numbytes = 0;
 	    while (numbytes != 2)
 		{
 	        num = write(fd, egdbuf + numbytes, 2 - numbytes);
 	        if (num >= 0)
 		    numbytes += num;
 	    	else
 		    {
 		    switch (errno)
 		    	{
 #ifdef EINTR
 		    	case EINTR:
 #endif
 #ifdef EAGAIN
 		    	case EAGAIN:
 #endif
 			    /* No error, try again */
 			    break;
 		    	default:
 			    ret = -1;
 			    goto err;	/* failure */
 			}
 		    }
 		}
 	    numbytes = 0;
 	    while (numbytes != 1)
 		{
 	        num = read(fd, egdbuf, 1);
 	        if (num == 0)
 			goto err;	/* descriptor closed */
 		else if (num > 0)
 		    numbytes += num;
 	    	else
 		    {
 		    switch (errno)
 		    	{
 #ifdef EINTR
 		    	case EINTR:
 #endif
 #ifdef EAGAIN
 		    	case EAGAIN:
 #endif
 			    /* No error, try again */
 			    break;
 		    	default:
 			    ret = -1;
 			    goto err;	/* failure */
 			}
 		    }
 		}
 	    if(egdbuf[0] == 0)
 		goto err;
 	    if (buf)
 		retrievebuf = buf + ret;
 	    else
 		retrievebuf = tempbuf;
 	    numbytes = 0;
 	    while (numbytes != egdbuf[0])
 		{
 	        num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
 		if (num == 0)
 			goto err;	/* descriptor closed */
 	        else if (num > 0)
 		    numbytes += num;
 	    	else
 		    {
 		    switch (errno)
 		    	{
 #ifdef EINTR
 		    	case EINTR:
 #endif
 #ifdef EAGAIN
 		    	case EAGAIN:
 #endif
 			    /* No error, try again */
 			    break;
 		    	default:
 			    ret = -1;
 			    goto err;	/* failure */
 			}
 		    }
 		}
 	    ret += egdbuf[0];
 	    bytes -= egdbuf[0];
 	    if (!buf)
 		RAND_seed(tempbuf, egdbuf[0]);
 	    }
  err:
 	if (fd != -1) close(fd);
 	return(ret);
 	}


 int RAND_egd_bytes(const char *path, int bytes)
 	{
 	int num, ret = 0;

 	num = RAND_query_egd_bytes(path, NULL, bytes);
 	if (num < 1) goto err;
 	if (RAND_status() == 1)
 	    ret = num;
  err:
 	return(ret);
 	}


 int RAND_egd(const char *path)
 	{
 	return (RAND_egd_bytes(path, 255));
 	}


 #endif
	/* crypto/rand/rand_egd.c */
	/* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */
	/* ====================================================================
	* Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* 3. All advertising materials mentioning features or use of this
	* software must display the following acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* openssl-core@openssl.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	* OF THE POSSIBILITY OF SUCH DAMAGE.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com).
	*
	*/

	#include <openssl/crypto.h>
	#include <openssl/e_os2.h>
	#include <openssl/rand.h>
	#include <openssl/buffer.h>

	/*
	* Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
	*
	* This module supplies three routines:
	*
	* RAND_query_egd_bytes(path, buf, bytes)
	* will actually query "bytes" bytes of entropy form the egd-socket located
	* at path and will write them to buf (if supplied) or will directly feed
	* it to RAND_seed() if buf==NULL.
	* The number of bytes is not limited by the maximum chunk size of EGD,
	* which is 255 bytes. If more than 255 bytes are wanted, several chunks
	* of entropy bytes are requested. The connection is left open until the
	* query is competed.
	* RAND_query_egd_bytes() returns with
	* -1 if an error occured during connection or communication.
	* num the number of bytes read from the EGD socket. This number is either
	* the number of bytes requested or smaller, if the EGD pool is
	* drained and the daemon signals that the pool is empty.
	* This routine does not touch any RAND_status(). This is necessary, since
	* PRNG functions may call it during initialization.
	*
	* RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
	* used to seed the PRNG.
	* RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
	* Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
	* seed status so that the return value can reflect the seed state:
	* -1 if an error occured during connection or communication _or_
	* if the PRNG has still not received the required seeding.
	* num the number of bytes read from the EGD socket. This number is either
	* the number of bytes requested or smaller, if the EGD pool is
	* drained and the daemon signals that the pool is empty.
	*
	* RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
	* the PRNG.
	* RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
	*/

	#if defined(OPENSSL_SYS_WIN32) \|\| defined(OPENSSL_SYS_VMS) \|\| defined(OPENSSL_SYS_MSDOS) \|\| defined(OPENSSL_SYS_VXWORKS) \|\| defined(OPENSSL_SYS_NETWARE) \|\| defined(OPENSSL_SYS_VOS) \|\| defined(OPENSSL_SYS_BEOS)
	int RAND_query_egd_bytes(const char path, unsigned char buf, int bytes)
	{
	return(-1);
	}
	int RAND_egd(const char *path)
	{
	return(-1);
	}

	int RAND_egd_bytes(const char *path,int bytes)
	{
	return(-1);
	}
	#else
	#include <openssl/opensslconf.h>
	#include OPENSSL_UNISTD
	#include <sys/types.h>
	#include <sys/socket.h>
	#ifndef NO_SYS_UN_H
	# ifdef OPENSSL_SYS_VXWORKS
	# include <streams/un.h>
	# else
	# include <sys/un.h>
	# endif
	#else
	struct sockaddr_un {
	short sun_family; /* AF_UNIX */
	char sun_path[108]; /* path name (gag) */
	};
	#endif /* NO_SYS_UN_H */
	#include <string.h>
	#include <errno.h>

	#ifndef offsetof
	# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
	#endif

	int RAND_query_egd_bytes(const char path, unsigned char buf, int bytes)
	{
	int ret = 0;
	struct sockaddr_un addr;
	int len, num, numbytes;
	int fd = -1;
	int success;
	unsigned char egdbuf[2], tempbuf[255], *retrievebuf;

	memset(&addr, 0, sizeof(addr));
	addr.sun_family = AF_UNIX;
	if (strlen(path) >= sizeof(addr.sun_path))
	return (-1);
	BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path);
	len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
	fd = socket(AF_UNIX, SOCK_STREAM, 0);
	if (fd == -1) return (-1);
	success = 0;
	while (!success)
	{
	if (connect(fd, (struct sockaddr *)&addr, len) == 0)
	success = 1;
	else
	{
	switch (errno)
	{
	#ifdef EINTR
	case EINTR:
	#endif
	#ifdef EAGAIN
	case EAGAIN:
	#endif
	#ifdef EINPROGRESS
	case EINPROGRESS:
	#endif
	#ifdef EALREADY
	case EALREADY:
	#endif
	/* No error, try again */
	break;
	#ifdef EISCONN
	case EISCONN:
	success = 1;
	break;
	#endif
	default:
	goto err; /* failure */
	}
	}
	}

	while(bytes > 0)
	{
	egdbuf[0] = 1;
	egdbuf[1] = bytes < 255 ? bytes : 255;
	numbytes = 0;
	while (numbytes != 2)
	{
	num = write(fd, egdbuf + numbytes, 2 - numbytes);
	if (num >= 0)
	numbytes += num;
	else
	{
	switch (errno)
	{
	#ifdef EINTR
	case EINTR:
	#endif
	#ifdef EAGAIN
	case EAGAIN:
	#endif
	/* No error, try again */
	break;
	default:
	ret = -1;
	goto err; /* failure */
	}
	}
	}
	numbytes = 0;
	while (numbytes != 1)
	{
	num = read(fd, egdbuf, 1);
	if (num == 0)
	goto err; /* descriptor closed */
	else if (num > 0)
	numbytes += num;
	else
	{
	switch (errno)
	{
	#ifdef EINTR
	case EINTR:
	#endif
	#ifdef EAGAIN
	case EAGAIN:
	#endif
	/* No error, try again */
	break;
	default:
	ret = -1;
	goto err; /* failure */
	}
	}
	}
	if(egdbuf[0] == 0)
	goto err;
	if (buf)
	retrievebuf = buf + ret;
	else
	retrievebuf = tempbuf;
	numbytes = 0;
	while (numbytes != egdbuf[0])
	{
	num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
	if (num == 0)
	goto err; /* descriptor closed */
	else if (num > 0)
	numbytes += num;
	else
	{
	switch (errno)
	{
	#ifdef EINTR
	case EINTR:
	#endif
	#ifdef EAGAIN
	case EAGAIN:
	#endif
	/* No error, try again */
	break;
	default:
	ret = -1;
	goto err; /* failure */
	}
	}
	}
	ret += egdbuf[0];
	bytes -= egdbuf[0];
	if (!buf)
	RAND_seed(tempbuf, egdbuf[0]);
	}
	err:
	if (fd != -1) close(fd);
	return(ret);
	}


	int RAND_egd_bytes(const char *path, int bytes)
	{
	int num, ret = 0;

	num = RAND_query_egd_bytes(path, NULL, bytes);
	if (num < 1) goto err;
	if (RAND_status() == 1)
	ret = num;
	err:
	return(ret);
	}


	int RAND_egd(const char *path)
	{
	return (RAND_egd_bytes(path, 255));
	}


	#endif