2 * Copyright (c) 2007 Kungliga Tekniska Högskolan
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38 RCSID("$Id: rand-egd.c 20093 2007-01-31 12:44:28Z lha $");
40 #include <sys/types.h>
57 static const char *egd_path = "/var/run/egd-pool";
59 #define MAX_EGD_DATA 255
62 connect_egd(const char *path)
64 struct sockaddr_un addr;
67 memset(&addr, 0, sizeof(addr));
69 if (strlen(path) > sizeof(addr.sun_path))
72 addr.sun_family = AF_UNIX;
73 strlcpy(addr.sun_path, path, sizeof(addr.sun_path));
75 fd = socket(AF_UNIX, SOCK_STREAM, 0);
79 if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) != 0) {
88 get_entropy(int fd, void *data, size_t len)
92 assert(len <= MAX_EGD_DATA);
94 msg[0] = 0x02; /* read blocking data */
95 msg[1] = len; /* wanted length */
97 if (net_write(fd, msg, sizeof(msg)) != sizeof(msg))
100 if (net_read(fd, data, len) != len)
107 put_entropy(int fd, const void *data, size_t len)
109 unsigned char msg[4];
111 assert (len <= MAX_EGD_DATA);
113 msg[0] = 0x03; /* write data */
114 msg[1] = 0; /* dummy */
115 msg[2] = 0; /* entropy */
116 msg[3] = len; /* length */
118 if (net_write(fd, msg, sizeof(msg)) != sizeof(msg))
120 if (net_write(fd, data, len) != len)
131 egd_seed(const void *indata, int size)
136 fd = connect_egd(egd_path);
142 if (len > MAX_EGD_DATA)
144 ret = put_entropy(fd, indata, len);
147 indata = ((unsigned char *)indata) + len;
154 get_bytes(const char *path, unsigned char *outdata, int size)
162 fd = connect_egd(path);
168 if (len > MAX_EGD_DATA)
170 ret = get_entropy(fd, outdata, len);
182 egd_bytes(unsigned char *outdata, int size)
184 return get_bytes(NULL, outdata, size);
193 egd_add(const void *indata, int size, double entropi)
195 egd_seed(indata, size);
199 egd_pseudorand(unsigned char *outdata, int size)
201 return get_bytes(NULL, outdata, size);
208 fd = connect_egd(egd_path);
215 const RAND_METHOD hc_rand_egd_method = {
225 RAND_egd_method(void)
227 return &hc_rand_egd_method;
232 RAND_egd(const char *filename)
234 return RAND_egd_bytes(filename, 128);
238 RAND_egd_bytes(const char *filename, int size)
250 ret = get_bytes(filename, data, size);
256 RAND_seed(data, size);
258 memset(data, 0, sizeof(data));