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50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <fcntl.h>
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#include <unistd.h>
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#include "secerr.h"
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#include "secrng.h"
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#include "prprf.h"
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void
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RNG_SystemInfoForRNG(void)
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{
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PRUint8 bytes[SYSTEM_RNG_SEED_COUNT];
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size_t numBytes = RNG_SystemRNG(bytes, SYSTEM_RNG_SEED_COUNT);
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if (!numBytes) {
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/* error is set */
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return;
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}
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RNG_RandomUpdate(bytes, numBytes);
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}
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size_t
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RNG_SystemRNG(void *dest, size_t maxLen)
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{
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int fd;
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int bytes;
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size_t fileBytes = 0;
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unsigned char *buffer = dest;
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fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0) {
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PORT_SetError(SEC_ERROR_NEED_RANDOM);
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return 0;
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}
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while (fileBytes < maxLen) {
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bytes = read(fd, buffer, maxLen - fileBytes);
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if (bytes <= 0) {
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break;
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}
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fileBytes += bytes;
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buffer += bytes;
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}
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(void)close(fd);
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if (fileBytes != maxLen) {
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PORT_SetError(SEC_ERROR_NEED_RANDOM);
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return 0;
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}
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return fileBytes;
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}
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