Problem - Kevin Tafuro

}
return buf;
}
unsigned char *spc_entropy(unsigned char *buf, size_t l) {
ssize_t nb;
unsigned char *p;
static unsigned char cmd = 0x02;
if (spc_egd_fd = = -1) spc_rand_init( );
/* Send the request command to the EGD server */
do {
if ((nb = write(spc_egd_fd, &cmd, sizeof(cmd))) = = -1 && errno != EINTR) {
perror("Communcation with entropy server failed");
exit(-1);
}
} while (nb = = -1);
for (p = buf; l; p += nb, l -= nb) {
do {
if ((nb = read(spc_egd_fd, p, l)) = = -1) {
if (errno = = -1) continue;
perror("Communication with entropy server failed");
exit(-1);
}
} while (nb = = -1);
}
return buf;
}
void spc_egd_write_entropy(unsigned char *data, size_t l) {
ssize_t nb;
unsigned char *buf, nbytes, *p;
static unsigned char cmd[4] = { 0x03, 0, 0, 0 };
for (buf = data; l; l -= cmd[3]) {
cmd[3] = (l > 255 ? 255 : l);
for (nbytes = 0, p = cmd; nbytes < sizeof(cmd); nbytes += nb) {
do {
if ((nb = write(spc_egd_fd, cmd, sizeof(cmd) - nbytes)) = = -1) {
if (errno != EINTR) continue;
perror("Communication with entropy server failed");
exit(-1);
}
} while (nb = = -1);
}
for (nbytes = 0; nbytes < cmd[3]; nbytes += nb, buf += nb) {
do {
if ((nb = write(spc_egd_fd, data, cmd[3] - nbytes)) = = -1) {
if (errno != EINTR) continue;
perror("Communication with entropy server failed");
exit(-1);
598 | Chapter 11: Random Numbers
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