82 lines
2 KiB
Text
82 lines
2 KiB
Text
$NetBSD: patch-ab,v 1.7 2001/07/11 01:26:10 wiz Exp $
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--- crypto/rand/md_rand.c.orig Mon Sep 11 14:42:39 2000
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+++ crypto/rand/md_rand.c
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@@ -308,6 +308,7 @@
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{
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static volatile int stirred_pool = 0;
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int i,j,k,st_num,st_idx;
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+ int num_ceil;
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int ok;
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long md_c[2];
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unsigned char local_md[MD_DIGEST_LENGTH];
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@@ -328,6 +329,12 @@
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}
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#endif
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+ if (num <= 0)
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+ return 1;
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+
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+ /* round upwards to multiple of MD_DIGEST_LENGTH/2 */
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+ num_ceil = (1 + (num-1)/(MD_DIGEST_LENGTH/2)) * (MD_DIGEST_LENGTH/2);
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+
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/*
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* (Based on the rand(3) manpage:)
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*
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@@ -409,11 +416,11 @@
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md_c[1] = md_count[1];
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memcpy(local_md, md, sizeof md);
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- state_index+=num;
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+ state_index+=num_ceil;
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if (state_index > state_num)
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state_index %= state_num;
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- /* state[st_idx], ..., state[(st_idx + num - 1) % st_num]
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+ /* state[st_idx], ..., state[(st_idx + num_ceil - 1) % st_num]
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* are now ours (but other threads may use them too) */
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md_count[0] += 1;
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@@ -424,6 +431,7 @@
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while (num > 0)
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{
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+ /* num_ceil -= MD_DIGEST_LENGTH/2 */
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j=(num >= MD_DIGEST_LENGTH/2)?MD_DIGEST_LENGTH/2:num;
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num-=j;
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MD_Init(&m);
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@@ -434,27 +442,28 @@
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curr_pid = 0;
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}
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#endif
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- MD_Update(&m,&(local_md[MD_DIGEST_LENGTH/2]),MD_DIGEST_LENGTH/2);
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+ MD_Update(&m,local_md,MD_DIGEST_LENGTH);
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MD_Update(&m,(unsigned char *)&(md_c[0]),sizeof(md_c));
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#ifndef PURIFY
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MD_Update(&m,buf,j); /* purify complains */
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#endif
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- k=(st_idx+j)-st_num;
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+ k=(st_idx+MD_DIGEST_LENGTH/2)-st_num;
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if (k > 0)
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{
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- MD_Update(&m,&(state[st_idx]),j-k);
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+ MD_Update(&m,&(state[st_idx]),MD_DIGEST_LENGTH/2-k);
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MD_Update(&m,&(state[0]),k);
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}
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else
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- MD_Update(&m,&(state[st_idx]),j);
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+ MD_Update(&m,&(state[st_idx]),MD_DIGEST_LENGTH/2);
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MD_Final(local_md,&m);
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- for (i=0; i<j; i++)
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+ for (i=0; i<MD_DIGEST_LENGTH/2; i++)
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{
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state[st_idx++]^=local_md[i]; /* may compete with other threads */
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- *(buf++)=local_md[i+MD_DIGEST_LENGTH/2];
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if (st_idx >= st_num)
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st_idx=0;
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+ if (i < j)
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+ *(buf++)=local_md[i+MD_DIGEST_LENGTH/2];
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}
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}
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