Document the hexadecimal casing thing in PORTING.md.
mab@ seems to be dealing with a fair number of these, so it's probably worth
adding to the list.
Change-Id: Ifaea3c96e7b089f28a87c7728ceb8c671786eb27
Reviewed-on: https://boringssl-review.googlesource.com/6030
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/PORTING.md b/PORTING.md
index 70b67cc..04b28fa 100644
--- a/PORTING.md
+++ b/PORTING.md
@@ -123,6 +123,12 @@
* If a HelloRequest is received while `SSL_write` has unsent application data,
the renegotiation is rejected.
+### Lowercase hexadecimal
+
+BoringSSL's `BN_bn2hex` function uses lowercase hexadecimal digits instead of
+uppercase. Some code may require changes to avoid being sensitive to this
+difference.
+
## Optional BoringSSL-specific simplifications
