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r4657: This really should be made a structure, so we can't get it wrong, but

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in the meantime, get the declaration right...

Andrew Bartlett
(This used to be commit 1c65db94f0)
This commit is contained in:
Andrew Bartlett 2005-01-10 22:52:01 +00:00 committed by Gerald (Jerry) Carter
parent fd4831f1f0
commit 7b91c309b8
1 changed files with 9 additions and 51 deletions
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58
source4/lib/genrand.c
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@ -24,7 +24,7 @@
#include "system/iconv.h"
#include "lib/crypto/crypto.h"
static unsigned char hash[258];
static unsigned char s_box[258];
static uint32 counter;
static BOOL done_reseed = False;
@ -54,59 +54,15 @@ static void get_rand_reseed_data(int *reseed_data)
}
}
/****************************************************************
Setup the seed.
*****************************************************************/
static void seed_random_stream(unsigned char *seedval, size_t seedlen)
{
unsigned char j = 0;
size_t ind;
for (ind = 0; ind < 256; ind++)
hash[ind] = (unsigned char)ind;
for( ind = 0; ind < 256; ind++) {
unsigned char tc;
j += (hash[ind] + seedval[ind%seedlen]);
tc = hash[ind];
hash[ind] = hash[j];
hash[j] = tc;
}
hash[256] = 0;
hash[257] = 0;
}
/****************************************************************
Get datasize bytes worth of random data.
*****************************************************************/
static void get_random_stream(unsigned char *data, size_t datasize)
static void get_random_stream(uint8_t sbox[258], unsigned char *data, size_t datasize)
{
unsigned char index_i = hash[256];
unsigned char index_j = hash[257];
size_t ind;
memset(data, '\0', datasize);
for( ind = 0; ind < datasize; ind++) {
unsigned char tc;
unsigned char t;
index_i++;
index_j += hash[index_i];
tc = hash[index_i];
hash[index_i] = hash[index_j];
hash[index_j] = tc;
t = hash[index_i] + hash[index_j];
data[ind] = hash[t];
}
hash[256] = index_i;
hash[257] = index_j;
arcfour_crypt_sbox(s_box, data, datasize);
}
/****************************************************************
@ -147,6 +103,7 @@ static void do_filehash(const char *fname, unsigned char *the_hash)
static int do_reseed(BOOL use_fd, int fd)
{
unsigned char seed_inbuf[40];
DATA_BLOB seed_blob;
uint32 v1, v2; struct timeval tval; pid_t mypid;
int reseed_data = 0;
@ -187,7 +144,8 @@ static int do_reseed(BOOL use_fd, int fd)
seed_inbuf[i] ^= ((char *)(&reseed_data))[i % sizeof(reseed_data)];
}
seed_random_stream(seed_inbuf, sizeof(seed_inbuf));
seed_blob = data_blob_const(seed_inbuf, sizeof(seed_inbuf));
arcfour_init(s_box, &seed_blob);
return -1;
}
@ -231,7 +189,7 @@ void generate_random_buffer(uint8_t *out, int len)
while(len > 0) {
int copy_len = len > 16 ? 16 : len;
get_random_stream(md4_buf, sizeof(md4_buf));
get_random_stream(s_box, md4_buf, sizeof(md4_buf));
mdfour(tmp_buf, md4_buf, sizeof(md4_buf));
memcpy(p, tmp_buf, copy_len);
p += copy_len;