Make it clear that chacha20 is a stream cipher

by explicitly using the define EVP_CIPH_STREAM_CIPHER
instead of the value 0 for the mode parameter.

Reviewed-by: Jakub Zelenka <[email protected]>
Reviewed-by: Frederik Wedel-Heinen <[email protected]>
Merge-date: Mon Oct 19 06:04:43 2026
Merged-from: https://github.com/openssl/openssl/pull/32393

1 files changed, 2 insertions, 2 deletions

diff --git a/crypto/evp/e_chacha20_poly1305.c b/crypto/evp/e_chacha20_poly1305.c
index 78dbe45ce44..1a44e29b535 100644
--- a/crypto/evp/e_chacha20_poly1305.c
+++ b/crypto/evp/e_chacha20_poly1305.c
@@ -19,7 +19,7 @@ static const EVP_CIPHER chacha20 = {
     1, /* block_size */
     CHACHA_KEY_SIZE, /* key_len */
     CHACHA_CTR_SIZE, /* iv_len, 128-bit counter in the context */
-    EVP_CIPH_CUSTOM_IV | EVP_CIPH_ALWAYS_CALL_INIT,
+    EVP_CIPH_STREAM_CIPHER | EVP_CIPH_CUSTOM_IV | EVP_CIPH_ALWAYS_CALL_INIT,
     EVP_ORIG_GLOBAL
 };
 
@@ -35,7 +35,7 @@ static const EVP_CIPHER chacha20_poly1305 = {
     1, /* block_size */
     CHACHA_KEY_SIZE, /* key_len */
     12, /* iv_len, 96-bit nonce in the context */
-    EVP_CIPH_FLAG_AEAD_CIPHER | EVP_CIPH_CUSTOM_IV | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY | EVP_CIPH_FLAG_CUSTOM_CIPHER | EVP_CIPH_CUSTOM_IV_LENGTH,
+    EVP_CIPH_STREAM_CIPHER | EVP_CIPH_FLAG_AEAD_CIPHER | EVP_CIPH_CUSTOM_IV | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY | EVP_CIPH_FLAG_CUSTOM_CIPHER | EVP_CIPH_CUSTOM_IV_LENGTH,
     EVP_ORIG_GLOBAL
 };