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.
Reviewed-by: Adam Langley <firstname.lastname@example.org>
diff --git a/PORTING.md b/PORTING.md
index 70b67cc..04b28fa 100644
@@ -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
## Optional BoringSSL-specific simplifications