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50 lines
829 B
50 lines
829 B
#ifndef _MSC_VER
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifndef S_SPLINT_S /* Including this here triggers a known bug in splint */
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//#include <unistd.h>
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#endif
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#define RNGDEV "/dev/urandom"
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int libscrypt_salt_gen(uint8_t *salt, size_t len)
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{
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unsigned char buf[len];
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size_t data_read = 0;
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int urandom = open(RNGDEV, O_RDONLY);
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if (urandom < 0)
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{
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return -1;
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}
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while (data_read < len) {
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ssize_t result = read(urandom, buf + data_read, len - data_read);
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if (result < 0)
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{
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if (errno == EINTR || errno == EAGAIN) {
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continue;
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}
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else {
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(void)close(urandom);
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return -1;
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}
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}
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data_read += result;
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}
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/* Failures on close() shouldn't occur with O_RDONLY */
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(void)close(urandom);
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memcpy(salt, buf, len);
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return 0;
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}
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#endif
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