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#include "randombytes.h"
#if defined(HAVE_GETRANDOM)
# ifdef HAVE_SYS_RANDOM_H
# include <sys/random.h>
# endif
void randombytes(uint8_t *buffer, uint64_t length) {
ssize_t gr_ret;
while (length > 0) {
gr_ret = getrandom(buffer, length, 0);
if (gr_ret <= 0) {
continue;
}
buffer += gr_ret;
length -= gr_ret;
}
return;
}
#elif defined(HAVE_GETENTROPY)
void randombytes(uint8_t *buffer, uint64_t length) {
int ge_ret;
int current_length;
while (length > 0) {
current_length = length;
if (current_length > 256) {
current_length = 256;
}
ge_ret = getentropy(buffer, current_length);
if (ge_ret != 0) {
continue;
}
buffer += current_length;
length -= current_length;
}
return;
}
#elif 1
#include <tcl.h>
void randombytes(uint8_t *buffer, uint64_t length) {
Tcl_Panic("Random data is not available");
#if 0
Tcl_Channel fd;
fd = Tcl_FSOpenFileChannel(NULL, Tcl_NewStringObj("/dev/urandom", -1), "rb", 0644);
if (!fd) {
Tcl_Panic("Unable to get random data");
while (length > 0) {
read_ret = Tcl_ReadChars(fd, buffer, length);
if (read_ret <= 0) {
continue;
}
buffer += read_ret;
length -= read_ret;
}
Tcl_Close(fd);
#endif
return;
/* NOTREACH */
buffer = buffer;
length = length;
}
void randombytes(uint8_t *buffer, uint64_t length) {
while (fd < 0) {
fd = open("/dev/urandom", O_RDONLY);
while (length > 0) {
read_ret = read(fd, buffer, length);
if (read_ret <= 0) {
continue;
}
buffer += read_ret;
length -= read_ret;
}
close(fd);
return;
}
#endif
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#include <limits.h>
#include <tcl.h>
#include "randombytes.h"
long long getrandom_impl(void *buf, unsigned int buflen);
void randombytes(unsigned char *buffer, unsigned long long length) {
long long gr_ret;
int errorCount = 0;
if (length > UINT_MAX || length > LONG_LONG_MAX) {
Tcl_Panic("Buffer length is too large");
}
while (length > 0) {
gr_ret = getrandom_impl(buffer, length);
if (gr_ret < 0) {
errorCount++;
if (errorCount > 10) {
Tcl_Panic("Unable to generate random numbers");
}
continue;
}
errorCount = 0;
if (gr_ret == 0) {
continue;
}
buffer += gr_ret;
length -= gr_ret;
}
return;
}
#if defined(HAVE_GETRANDOM)
# ifdef HAVE_SYS_RANDOM_H
# include <sys/random.h>
# endif
long long getrandom_impl(void *buf, unsigned int buflen) {
ssize_t gr_ret;
gr_ret = getrandom(buf, buflen, 0);
return(gr_ret);
}
#elif defined(HAVE_GETENTROPY)
#include <unistd.h>
long long getrandom_impl(void *buf, unsigned int buflen) {
int ge_ret;
if (buflen > 255) {
buflen = 255;
}
ge_ret = getentropy(buf, buflen);
if (ge_ret != 0) {
return(-1);
}
return(buflen);
}
#elif defined(HAVE_CRYPTGENRANDOM) && 0
#include <tcl.h>
long long getrandom_impl(void *buf, unsigned int buflen) {
Tcl_Panic("Incomplete CryptGenRandom");
}
#else
# ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
# endif
# ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
# endif
# ifdef HAVE_FCNTL_H
# include <fcntl.h>
# endif
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
long long getrandom_impl(void *buf, unsigned int buflen) {
ssize_t read_ret;
long long retval;
int fd = -1;
fd = open("/dev/urandom", O_RDONLY);
if (fd < 0) {
return(-1);
}
retval = 0;
while (buflen > 0) {
read_ret = read(fd, buf, buflen);
if (read_ret <= 0) {
continue;
}
buf += read_ret;
retval += read_ret;
buflen -= read_ret;
}
close(fd);
return(retval);
}
#endif
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