1 files changed, 15 insertions, 1 deletions
diff --git a/cipher/md5.c b/cipher/md5.c
index 9bba57641..cf8861d10 100644
--- a/cipher/md5.c
+++ b/cipher/md5.c
@@ -72,6 +72,18 @@ md5_init( MD5_CONTEXT *ctx )
 #define FH(b, c, d) (b ^ c ^ d)
 #define FI(b, c, d) (c ^ (b | ~d))
 
+static void
+burn_stack (int bytes)
+{
+    char buf[128];
+    
+    memset (buf, 0, sizeof buf);
+    bytes -= sizeof buf;
+    if (bytes > 0)
+        burn_stack (bytes);
+}
+
+
 
 /****************
  * transform n*64 bytes
@@ -217,6 +229,7 @@ md5_write( MD5_CONTEXT *hd, byte *inbuf, size_t inlen)
 {
     if( hd->count == 64 ) { /* flush the buffer */
 	transform( hd, hd->buf );
+        burn_stack (80+6*sizeof(void*));
 	hd->count = 0;
 	hd->nblocks++;
     }
@@ -237,9 +250,9 @@ md5_write( MD5_CONTEXT *hd, byte *inbuf, size_t inlen)
 	inlen -= 64;
 	inbuf += 64;
     }
+    burn_stack (80+6*sizeof(void*));
     for( ; inlen && hd->count < 64; inlen-- )
 	hd->buf[hd->count++] = *inbuf++;
-
 }
 
 
@@ -294,6 +307,7 @@ md5_final( MD5_CONTEXT *hd )
     hd->buf[62] = msb >> 16;
     hd->buf[63] = msb >> 24;
     transform( hd, hd->buf );
+    burn_stack (80+6*sizeof(void*));
 
     p = hd->buf;
   #ifdef BIG_ENDIAN_HOST