Update comments

1 files changed, 5 insertions, 4 deletions

diff --git a/chacha.cpp b/chacha.cpp
index 3676eaf7..2514aeb1 100644
--- a/chacha.cpp
+++ b/chacha.cpp
@@ -79,10 +79,11 @@ typedef word32 WordType;
 enum {BYTES_PER_ITERATION=64};

 

 // MultiBlockSafe detects a condition that can arise in the SIMD

-// implementations where we overflow one of the 32-bit state words

-// during addition in an intermediate result. Conditions to trigger

-// issue include a user seeks to around 2^32 blocks (256 GB of data).

-// https://github.com/weidai11/cryptopp/issues/732

+// implementations where we overflow one of the 32-bit state words during

+// addition in an intermediate result. Preconditions for the issue include

+// a user seeks to around 2^32 blocks (256 GB of data) for ChaCha; or a

+// user specifies an arbitrarily large initial counter block for ChaChaTLS.

+// Also see https://github.com/weidai11/cryptopp/issues/732.

 inline bool MultiBlockSafe(unsigned int ctrLow, unsigned int blocks)

 {

     return 0xffffffff - ctrLow > blocks;