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/* various methods to collect entropy */
#include "prng.h"
#include "fortuna.h"
#include "k5-int.h"
#ifndef min
#define min(a, b) ((a) < (b) ? (a) : (b))
#endif
krb5_error_code
k5_entropy_from_device(krb5_context context, const char *device, unsigned char* buf, int buflen)
{
struct stat sb;
int fd;
//unsigned char buf[ENTROPY_BUFSIZE], *bp;
unsigned char *bp;
size_t left;
fd = open(device, O_RDONLY);
if (fd == -1)
return 0;
set_cloexec_fd(fd);
if (fstat(fd, &sb) == -1 || S_ISREG(sb.st_mode)) {
close(fd);
return 0;
}
for (bp = buf, left = sizeof(buf); left > 0;) {
ssize_t count;
count = read(fd, bp, (unsigned) left);
if (count <= 0) {
close(fd);
return 0;
}
left -= count;
bp += count;
}
close(fd);
return 0;
}
krb5_error_code
k5_entropy_dev_random(krb5_context context, unsigned char* buf, int buflen)
{
return k5_entropy_from_device(context,"/dev/random", buf, buflen);
}
krb5_error_code
k5_entropy_dev_urandom(krb5_context context, unsigned char* buf, int buflen)
{
return k5_entropy_from_device(context,"/dev/urandom", buf, buflen);
}
krb5_error_code
k5_entropy_pid(krb5_context context, unsigned char* buf, int buflen)
{
pid_t pid = getpid();
int pidlen = min(buflen,(int)sizeof(&pid));
memcpy(buf, &pid, pidlen);
return 0;
}
krb5_error_code
k5_entropy_uid(krb5_context context, unsigned char* buf, int buflen)
{
pid_t uid = getuid();
int uidlen=min(buflen,(int)sizeof(&uid));
memcpy(buf, &uid, uidlen);
return 0;
}
#ifdef TEST_FORTUNA
int
test_entr(krb5_context context, unsigned char* buf, int buflen)
{
char buf1[4] = "abc";
memset(buf, 0, buflen);
memcpy(buf, buf1, min(buflen,4));
return 0;
}
#endif
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