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1 /* crypto/rand/rand_egd.c */
2 /* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */
3 /* ====================================================================
4 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. All advertising materials mentioning features or use of this
19 * software must display the following acknowledgment:
20 * "This product includes software developed by the OpenSSL Project
21 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
23 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
24 * endorse or promote products derived from this software without
25 * prior written permission. For written permission, please contact
26 * openssl-core@openssl.org.
28 * 5. Products derived from this software may not be called "OpenSSL"
29 * nor may "OpenSSL" appear in their names without prior written
30 * permission of the OpenSSL Project.
32 * 6. Redistributions of any form whatsoever must retain the following
34 * "This product includes software developed by the OpenSSL Project
35 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
37 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
38 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
40 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
46 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
48 * OF THE POSSIBILITY OF SUCH DAMAGE.
49 * ====================================================================
51 * This product includes cryptographic software written by Eric Young
52 * (eay@cryptsoft.com). This product includes software written by Tim
53 * Hudson (tjh@cryptsoft.com).
57 #include <openssl/rand.h>
60 * Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
62 * This module supplies three routines:
64 * RAND_query_egd_bytes(path, buf, bytes)
65 * will actually query "bytes" bytes of entropy form the egd-socket located
66 * at path and will write them to buf (if supplied) or will directly feed
67 * it to RAND_seed() if buf==NULL.
68 * The number of bytes is not limited by the maximum chunk size of EGD,
69 * which is 255 bytes. If more than 255 bytes are wanted, several chunks
70 * of entropy bytes are requested. The connection is left open until the
72 * RAND_query_egd_bytes() returns with
73 * -1 if an error occured during connection or communication.
74 * num the number of bytes read from the EGD socket. This number is either
75 * the number of bytes requested or smaller, if the EGD pool is
76 * drained and the daemon signals that the pool is empty.
77 * This routine does not touch any RAND_status(). This is necessary, since
78 * PRNG functions may call it during initialization.
80 * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
81 * used to seed the PRNG.
82 * RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
83 * Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
84 * seed status so that the return value can reflect the seed state:
85 * -1 if an error occured during connection or communication _or_
86 * if the PRNG has still not received the required seeding.
87 * num the number of bytes read from the EGD socket. This number is either
88 * the number of bytes requested or smaller, if the EGD pool is
89 * drained and the daemon signals that the pool is empty.
91 * RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
93 * RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
96 #if defined(OPENSSL_SYS_WIN32) || defined(VMS) || defined(__VMS)
97 int RAND_query_egd_bytes(const char *path
, unsigned char *buf
, int bytes
)
101 int RAND_egd(const char *path
)
106 int RAND_egd_bytes(const char *path
,int bytes
)
111 #include <openssl/opensslconf.h>
112 #include OPENSSL_UNISTD
113 #include <sys/types.h>
114 #include <sys/socket.h>
120 # define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
123 int RAND_query_egd_bytes(const char *path
, unsigned char *buf
, int bytes
)
126 struct sockaddr_un addr
;
127 int len
, num
, numbytes
;
130 unsigned char egdbuf
[2], tempbuf
[255], *retrievebuf
;
132 memset(&addr
, 0, sizeof(addr
));
133 addr
.sun_family
= AF_UNIX
;
134 if (strlen(path
) > sizeof(addr
.sun_path
))
136 strcpy(addr
.sun_path
,path
);
137 len
= offsetof(struct sockaddr_un
, sun_path
) + strlen(path
);
138 fd
= socket(AF_UNIX
, SOCK_STREAM
, 0);
139 if (fd
== -1) return (-1);
143 if (connect(fd
, (struct sockaddr
*)&addr
, len
) == 0)
161 /* No error, try again */
169 goto err
; /* failure */
177 egdbuf
[1] = bytes
< 255 ? bytes
: 255;
179 while (numbytes
!= 2)
181 num
= write(fd
, egdbuf
+ numbytes
, 2 - numbytes
);
194 /* No error, try again */
198 goto err
; /* failure */
203 while (numbytes
!= 1)
205 num
= read(fd
, egdbuf
, 1);
218 /* No error, try again */
222 goto err
; /* failure */
229 retrievebuf
= buf
+ ret
;
231 retrievebuf
= tempbuf
;
233 while (numbytes
!= egdbuf
[0])
235 num
= read(fd
, retrievebuf
+ numbytes
, egdbuf
[0] - numbytes
);
248 /* No error, try again */
252 goto err
; /* failure */
259 RAND_seed(tempbuf
, egdbuf
[0]);
262 if (fd
!= -1) close(fd
);
267 int RAND_egd_bytes(const char *path
, int bytes
)
271 num
= RAND_query_egd_bytes(path
, NULL
, bytes
);
272 if (num
< 1) goto err
;
273 if (RAND_status() == 1)
280 int RAND_egd(const char *path
)
282 return (RAND_egd_bytes(path
, 255));