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Differential D16898 Diff 47297 sys/dev/random/randomdev.c

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sys/dev/random/randomdev.c

Show First 20 Lines • Show All 160 Lines • ▼ Show 20 Lines if (error == 0) {
read_rate_increment((uio->uio_resid + sizeof(uint32_t))/sizeof(uint32_t)); read_rate_increment((uio->uio_resid + sizeof(uint32_t))/sizeof(uint32_t));
total_read = 0; total_read = 0;
while (uio->uio_resid && !error) { while (uio->uio_resid && !error) {
read_len = uio->uio_resid; read_len = uio->uio_resid;
/* /*
* Belt-and-braces. * Belt-and-braces.
* Round up the read length to a crypto block size multiple, * Round up the read length to a crypto block size multiple,
* which is what the underlying generator is expecting. * which is what the underlying generator is expecting.
* See the random_buf size requirements in the Yarrow/Fortuna code. * See the random_buf size requirements in the Fortuna code.
*/ */
read_len = roundup(read_len, RANDOM_BLOCKSIZE); read_len = roundup(read_len, RANDOM_BLOCKSIZE);
/* Work in chunks page-sized or less */ /* Work in chunks page-sized or less */
read_len = MIN(read_len, PAGE_SIZE); read_len = MIN(read_len, PAGE_SIZE);
p_random_alg_context->ra_read(random_buf, read_len); p_random_alg_context->ra_read(random_buf, read_len);
c = MIN(uio->uio_resid, read_len); c = MIN(uio->uio_resid, read_len);
/* /*
* uiomove() may yield the CPU before each 'c' bytes * uiomove() may yield the CPU before each 'c' bytes
▲ Show 20 Lines • Show All 67 Lines • ▼ Show 20 Linesrandomdev_accumulate(uint8_t *buf, u_int count)
randomdev_hash_iterate(&hash, buf, count); randomdev_hash_iterate(&hash, buf, count);
timestamp = (uint32_t)get_cyclecount(); timestamp = (uint32_t)get_cyclecount();
randomdev_hash_iterate(&hash, &timestamp, sizeof(timestamp)); randomdev_hash_iterate(&hash, &timestamp, sizeof(timestamp));
randomdev_hash_finish(&hash, entropy_data); randomdev_hash_finish(&hash, entropy_data);
explicit_bzero(&hash, sizeof(hash)); explicit_bzero(&hash, sizeof(hash));
for (i = 0; i < RANDOM_KEYSIZE_WORDS; i += sizeof(event.he_entropy)/sizeof(event.he_entropy[0])) { for (i = 0; i < RANDOM_KEYSIZE_WORDS; i += sizeof(event.he_entropy)/sizeof(event.he_entropy[0])) {
event.he_somecounter = (uint32_t)get_cyclecount(); event.he_somecounter = (uint32_t)get_cyclecount();
event.he_size = sizeof(event.he_entropy); event.he_size = sizeof(event.he_entropy);
event.he_bits = event.he_size/8;
event.he_source = RANDOM_CACHED; event.he_source = RANDOM_CACHED;
event.he_destination = destination++; /* Harmless cheating */ event.he_destination = destination++; /* Harmless cheating */
memcpy(event.he_entropy, entropy_data + i, sizeof(event.he_entropy)); memcpy(event.he_entropy, entropy_data + i, sizeof(event.he_entropy));
p_random_alg_context->ra_event_processor(&event); p_random_alg_context->ra_event_processor(&event);
} }
explicit_bzero(entropy_data, sizeof(entropy_data)); explicit_bzero(entropy_data, sizeof(entropy_data));
} }
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