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103 lines
2.4 KiB
103 lines
2.4 KiB
/**
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* \file
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*
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* This adds the generated random bytes (sha1 hash of request) to the
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* /dev/random
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*
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* \author Georg Hopp <georg@steffers.org
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*
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* \copyright
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* Copyright © 2012 Georg Hopp
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <fcntl.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <linux/random.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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int get_entropy_bits(const unsigned char *, size_t);
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/**
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* fill /dev/random with sha1 from current request
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*
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* \todo add error handling...
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*/
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void
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add_entropy(const unsigned char * data, size_t ndata)
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{
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int i;
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int fd;
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int entropy = get_entropy_bits(data, ndata);
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struct rand_pool_info * output;
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output = (struct rand_pool_info *)malloc(
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sizeof(struct rand_pool_info) + ndata);
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output->entropy_count = entropy;
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output->buf_size = ndata;
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memcpy(output->buf, data, ndata);
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fd = open("/dev/random", O_WRONLY|O_NONBLOCK);
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if (ioctl(fd, RNDADDENTROPY, output) == -1) {
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switch(errno) {
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case EBADF:
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fprintf(stderr,
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"ioctl failed: no valid file descriptor %d\n",
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fd);
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break;
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case EFAULT:
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fprintf(stderr,
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"ioctl failed: invalid argument: %p\n",
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output);
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break;
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case EINVAL:
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fprintf(stderr,
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"ioctl failed: invalid request\n",
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errno);
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break;
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case ENOTTY:
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fprintf(stderr,
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"ioctl failed: discriptor not associated to "
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"character device\n",
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errno);
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break;
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case EPERM:
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fprintf(stderr,
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"ioctl failed: invalid permissions\n",
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errno);
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break;
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default:
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fprintf(stderr,
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"ioctl(RNDADDENTROPY) failed: %d\n",
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errno);
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break;
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}
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}
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fflush(stderr);
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free(output);
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close(fd);
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}
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// vim: set ts=4 sw=4:
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