86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
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#include <errno.h>
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#include <fcntl.h>
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#ifdef __linux__
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#include <poll.h>
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#endif
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#include <sys/types.h>
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#include <unistd.h>
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#ifdef __linux__
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static int
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hydro_random_block_on_dev_random(void)
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{
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struct pollfd pfd;
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int fd;
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int pret;
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fd = open("/dev/random", O_RDONLY);
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if (fd == -1) {
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return 0;
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}
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pfd.fd = fd;
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pfd.events = POLLIN;
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pfd.revents = 0;
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do {
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pret = poll(&pfd, 1, -1);
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} while (pret < 0 && (errno == EINTR || errno == EAGAIN));
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if (pret != 1) {
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(void) close(fd);
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errno = EIO;
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return -1;
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}
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return close(fd);
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}
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#endif
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static ssize_t
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hydro_random_safe_read(const int fd, void *const buf_, size_t len)
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{
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unsigned char *buf = (unsigned char *) buf_;
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ssize_t readnb;
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do {
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while ((readnb = read(fd, buf, len)) < (ssize_t) 0 && (errno == EINTR || errno == EAGAIN)) {
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}
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if (readnb < (ssize_t) 0) {
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return readnb;
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}
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if (readnb == (ssize_t) 0) {
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break;
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}
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len -= (size_t) readnb;
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buf += readnb;
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} while (len > (ssize_t) 0);
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return (ssize_t) (buf - (unsigned char *) buf_);
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}
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static int
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hydro_random_init(void)
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{
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uint8_t tmp[gimli_BLOCKBYTES + 8];
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int fd;
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int ret = -1;
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#ifdef __linux__
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if (hydro_random_block_on_dev_random() != 0) {
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return -1;
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}
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#endif
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do {
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fd = open("/dev/urandom", O_RDONLY);
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if (fd == -1 && errno != EINTR) {
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return -1;
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}
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} while (fd == -1);
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if (hydro_random_safe_read(fd, tmp, sizeof tmp) == (ssize_t) sizeof tmp) {
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memcpy(hydro_random_context.state, tmp, gimli_BLOCKBYTES);
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memcpy(&hydro_random_context.counter, tmp + gimli_BLOCKBYTES, 8);
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hydro_memzero(tmp, sizeof tmp);
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ret = 0;
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}
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ret |= close(fd);
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return ret;
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}
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