2 * Copyright (c) 2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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 the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/types.h>
53 static const char *egd_path
= "/var/run/egd-pool";
55 #define MAX_EGD_DATA 255
58 connect_egd(const char *path
)
60 struct sockaddr_un addr
;
63 memset(&addr
, 0, sizeof(addr
));
65 if (strlen(path
) > sizeof(addr
.sun_path
))
68 addr
.sun_family
= AF_UNIX
;
69 strlcpy(addr
.sun_path
, path
, sizeof(addr
.sun_path
));
71 fd
= socket(AF_UNIX
, SOCK_STREAM
, 0);
77 if (connect(fd
, (struct sockaddr
*)&addr
, sizeof(addr
)) != 0) {
86 get_entropy(int fd
, void *data
, size_t len
)
90 assert(len
<= MAX_EGD_DATA
);
92 msg
[0] = 0x02; /* read blocking data */
93 msg
[1] = len
; /* wanted length */
95 if (net_write(fd
, msg
, sizeof(msg
)) != sizeof(msg
))
98 if (net_read(fd
, data
, len
) != len
)
105 put_entropy(int fd
, const void *data
, size_t len
)
107 unsigned char msg
[4];
109 assert (len
<= MAX_EGD_DATA
);
111 msg
[0] = 0x03; /* write data */
112 msg
[1] = 0; /* dummy */
113 msg
[2] = 0; /* entropy */
114 msg
[3] = len
; /* length */
116 if (net_write(fd
, msg
, sizeof(msg
)) != sizeof(msg
))
118 if (net_write(fd
, data
, len
) != len
)
129 egd_seed(const void *indata
, int size
)
134 fd
= connect_egd(egd_path
);
140 if (len
> MAX_EGD_DATA
)
142 ret
= put_entropy(fd
, indata
, len
);
145 indata
= ((unsigned char *)indata
) + len
;
152 get_bytes(const char *path
, unsigned char *outdata
, int size
)
160 fd
= connect_egd(path
);
166 if (len
> MAX_EGD_DATA
)
168 ret
= get_entropy(fd
, outdata
, len
);
180 egd_bytes(unsigned char *outdata
, int size
)
182 return get_bytes(NULL
, outdata
, size
);
191 egd_add(const void *indata
, int size
, double entropi
)
193 egd_seed(indata
, size
);
197 egd_pseudorand(unsigned char *outdata
, int size
)
199 return get_bytes(NULL
, outdata
, size
);
206 fd
= connect_egd(egd_path
);
213 const RAND_METHOD hc_rand_egd_method
= {
223 RAND_egd_method(void)
225 return &hc_rand_egd_method
;
230 RAND_egd(const char *filename
)
232 return RAND_egd_bytes(filename
, 128);
236 RAND_egd_bytes(const char *filename
, int size
)
248 ret
= get_bytes(filename
, data
, size
);
254 RAND_seed(data
, size
);
256 memset(data
, 0, size
);