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
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43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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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/e_os2.h>
58 #include <openssl/rand.h>
59 #include <openssl/buffer.h>
62 * Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
64 * This module supplies three routines:
66 * RAND_query_egd_bytes(path, buf, bytes)
67 * will actually query "bytes" bytes of entropy form the egd-socket located
68 * at path and will write them to buf (if supplied) or will directly feed
69 * it to RAND_seed() if buf==NULL.
70 * The number of bytes is not limited by the maximum chunk size of EGD,
71 * which is 255 bytes. If more than 255 bytes are wanted, several chunks
72 * of entropy bytes are requested. The connection is left open until the
74 * RAND_query_egd_bytes() returns with
75 * -1 if an error occured during connection or communication.
76 * num the number of bytes read from the EGD socket. This number is either
77 * the number of bytes requested or smaller, if the EGD pool is
78 * drained and the daemon signals that the pool is empty.
79 * This routine does not touch any RAND_status(). This is necessary, since
80 * PRNG functions may call it during initialization.
82 * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
83 * used to seed the PRNG.
84 * RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
85 * Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
86 * seed status so that the return value can reflect the seed state:
87 * -1 if an error occured during connection or communication _or_
88 * if the PRNG has still not received the required seeding.
89 * num the number of bytes read from the EGD socket. This number is either
90 * the number of bytes requested or smaller, if the EGD pool is
91 * drained and the daemon signals that the pool is empty.
93 * RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
95 * RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
98 #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)
99 int RAND_query_egd_bytes(const char *path
, unsigned char *buf
, int bytes
)
103 int RAND_egd(const char *path
)
108 int RAND_egd_bytes(const char *path
,int bytes
)
113 #include <openssl/opensslconf.h>
114 #include OPENSSL_UNISTD
115 #include <sys/types.h>
116 #include <sys/socket.h>
118 # ifdef OPENSSL_SYS_VXWORKS
119 # include <streams/un.h>
125 short sun_family
; /* AF_UNIX */
126 char sun_path
[108]; /* path name (gag) */
128 #endif /* NO_SYS_UN_H */
133 # define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
136 int RAND_query_egd_bytes(const char *path
, unsigned char *buf
, int bytes
)
139 struct sockaddr_un addr
;
140 int len
, num
, numbytes
;
143 unsigned char egdbuf
[2], tempbuf
[255], *retrievebuf
;
145 memset(&addr
, 0, sizeof(addr
));
146 addr
.sun_family
= AF_UNIX
;
147 if (strlen(path
) >= sizeof(addr
.sun_path
))
149 BUF_strlcpy(addr
.sun_path
,path
,sizeof addr
.sun_path
);
150 len
= offsetof(struct sockaddr_un
, sun_path
) + strlen(path
);
151 fd
= socket(AF_UNIX
, SOCK_STREAM
, 0);
152 if (fd
== -1) return (-1);
156 if (connect(fd
, (struct sockaddr
*)&addr
, len
) == 0)
174 /* No error, try again */
182 goto err
; /* failure */
190 egdbuf
[1] = bytes
< 255 ? bytes
: 255;
192 while (numbytes
!= 2)
194 num
= write(fd
, egdbuf
+ numbytes
, 2 - numbytes
);
207 /* No error, try again */
211 goto err
; /* failure */
216 while (numbytes
!= 1)
218 num
= read(fd
, egdbuf
, 1);
220 goto err
; /* descriptor closed */
233 /* No error, try again */
237 goto err
; /* failure */
244 retrievebuf
= buf
+ ret
;
246 retrievebuf
= tempbuf
;
248 while (numbytes
!= egdbuf
[0])
250 num
= read(fd
, retrievebuf
+ numbytes
, egdbuf
[0] - numbytes
);
252 goto err
; /* descriptor closed */
265 /* No error, try again */
269 goto err
; /* failure */
276 RAND_seed(tempbuf
, egdbuf
[0]);
279 if (fd
!= -1) close(fd
);
284 int RAND_egd_bytes(const char *path
, int bytes
)
288 num
= RAND_query_egd_bytes(path
, NULL
, bytes
);
289 if (num
< 1) goto err
;
290 if (RAND_status() == 1)
297 int RAND_egd(const char *path
)
299 return (RAND_egd_bytes(path
, 255));