39 líneas
644 B
C
39 líneas
644 B
C
/*
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This code was taken from the SPHINCS reference implementation and is public domain.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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/* it's really stupid that there isn't a syscall for this */
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static int fd = -1;
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void randombytes(unsigned char *x,unsigned long long xlen)
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{
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int i;
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if (fd == -1) {
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for (;;) {
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fd = open("/dev/urandom",O_RDONLY);
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if (fd != -1) break;
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sleep(1);
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}
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}
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while (xlen > 0) {
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if (xlen < 1048576) i = xlen; else i = 1048576;
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i = read(fd,x,i);
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if (i < 1) {
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sleep(1);
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continue;
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}
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x += i;
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xlen -= i;
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}
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}
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