Use sanity check timestamps as entropy

sipa · sipa · commit 2c0a6f157da3 · 2017-05-05T11:56:24.000-07:00
diff --git a/src/random.cpp b/src/random.cpp
@@ -298,6 +298,10 @@ bool Random_SanityCheck()
     uint64_t stop = GetPerformanceCounter();
     if (stop == start) return false;
 
+    // We called GetPerformanceCounter. Use it as entropy.
+    RAND_add((const unsigned char*)&start, sizeof(start), 1);
+    RAND_add((const unsigned char*)&stop, sizeof(stop), 1);
+
     return true;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -298,6 +298,10 @@ bool Random_SanityCheck()`
`298`	`298`	`uint64_t stop = GetPerformanceCounter();`
`299`	`299`	`if (stop == start) return false;`
`300`	`300`
	`301`	`+ // We called GetPerformanceCounter. Use it as entropy.`
	`302`	`+ RAND_add((const unsigned char*)&start, sizeof(start), 1);`
	`303`	`+ RAND_add((const unsigned char*)&stop, sizeof(stop), 1);`
	`304`	`+`
`301`	`305`	`return true;`
`302`	`306`	`}`
`303`	`307`