Add a changelog entry for the ChaCha20 default behavior change
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/ChangeLog.d/chacha20_invalid_iv_len_fix.txt b/ChangeLog.d/chacha20_invalid_iv_len_fix.txt
new file mode 100644
index 0000000..af35e2a
--- /dev/null
+++ b/ChangeLog.d/chacha20_invalid_iv_len_fix.txt
@@ -0,0 +1,4 @@
+Default behavior changes
+ * mbedtls_cipher_set_iv will now fail with ChaCha20 and ChaCha20+Poly1305
+ for IV lengths other than 12. The library was silently overwriting this
+ length with 12, but did not inform the caller about it. Fixes #4301.