1 /* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */
2 /* ====================================================================
3 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@openssl.org.
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com). This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
56 #include <openssl/opensslconf.h>
58 NON_EMPTY_TRANSLATION_UNIT
61 # include <openssl/crypto.h>
62 # include <openssl/e_os2.h>
63 # include <openssl/rand.h>
66 * Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
68 * This module supplies three routines:
70 * RAND_query_egd_bytes(path, buf, bytes)
71 * will actually query "bytes" bytes of entropy form the egd-socket located
72 * at path and will write them to buf (if supplied) or will directly feed
73 * it to RAND_seed() if buf==NULL.
74 * The number of bytes is not limited by the maximum chunk size of EGD,
75 * which is 255 bytes. If more than 255 bytes are wanted, several chunks
76 * of entropy bytes are requested. The connection is left open until the
78 * RAND_query_egd_bytes() returns with
79 * -1 if an error occurred during connection or communication.
80 * num the number of bytes read from the EGD socket. This number is either
81 * the number of bytes requested or smaller, if the EGD pool is
82 * drained and the daemon signals that the pool is empty.
83 * This routine does not touch any RAND_status(). This is necessary, since
84 * PRNG functions may call it during initialization.
86 * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
87 * used to seed the PRNG.
88 * RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
89 * Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
90 * seed status so that the return value can reflect the seed state:
91 * -1 if an error occurred during connection or communication _or_
92 * if the PRNG has still not received the required seeding.
93 * num the number of bytes read from the EGD socket. This number is either
94 * the number of bytes requested or smaller, if the EGD pool is
95 * drained and the daemon signals that the pool is empty.
97 * RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
99 * RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
102 # 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_UEFI)
103 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
108 int RAND_egd(const char *path)
113 int RAND_egd_bytes(const char *path, int bytes)
118 # include <openssl/opensslconf.h>
119 # include OPENSSL_UNISTD
121 # include <sys/types.h>
122 # include <sys/socket.h>
124 # ifdef OPENSSL_SYS_VXWORKS
125 # include <streams/un.h>
131 short sun_family; /* AF_UNIX */
132 char sun_path[108]; /* path name (gag) */
134 # endif /* NO_SYS_UN_H */
138 int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
141 struct sockaddr_un addr;
142 int len, num, numbytes;
145 unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
147 memset(&addr, 0, sizeof(addr));
148 addr.sun_family = AF_UNIX;
149 if (strlen(path) >= sizeof(addr.sun_path))
151 OPENSSL_strlcpy(addr.sun_path, path, sizeof addr.sun_path);
152 len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
153 fd = socket(AF_UNIX, SOCK_STREAM, 0);
158 if (connect(fd, (struct sockaddr *)&addr, len) == 0)
174 /* No error, try again */
182 goto err; /* failure */
189 egdbuf[1] = bytes < 255 ? bytes : 255;
191 while (numbytes != 2) {
192 num = write(fd, egdbuf + numbytes, 2 - numbytes);
203 /* No error, try again */
207 goto err; /* failure */
212 while (numbytes != 1) {
213 num = read(fd, egdbuf, 1);
215 goto err; /* descriptor closed */
226 /* No error, try again */
230 goto err; /* failure */
237 retrievebuf = buf + ret;
239 retrievebuf = tempbuf;
241 while (numbytes != egdbuf[0]) {
242 num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
244 goto err; /* descriptor closed */
255 /* No error, try again */
259 goto err; /* failure */
266 RAND_seed(tempbuf, egdbuf[0]);
274 int RAND_egd_bytes(const char *path, int bytes)
278 num = RAND_query_egd_bytes(path, NULL, bytes);
281 if (RAND_status() == 1)
287 int RAND_egd(const char *path)
289 return (RAND_egd_bytes(path, 255));