v4.19.13 snapshot.
diff --git a/include/crypto/chacha20.h b/include/crypto/chacha20.h
new file mode 100644
index 0000000..b83d660
--- /dev/null
+++ b/include/crypto/chacha20.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common values for the ChaCha20 algorithm
+ */
+
+#ifndef _CRYPTO_CHACHA20_H
+#define _CRYPTO_CHACHA20_H
+
+#include <crypto/skcipher.h>
+#include <linux/types.h>
+#include <linux/crypto.h>
+
+#define CHACHA20_IV_SIZE 16
+#define CHACHA20_KEY_SIZE 32
+#define CHACHA20_BLOCK_SIZE 64
+#define CHACHA20_BLOCK_WORDS (CHACHA20_BLOCK_SIZE / sizeof(u32))
+
+struct chacha20_ctx {
+ u32 key[8];
+};
+
+void chacha20_block(u32 *state, u32 *stream);
+void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv);
+int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int keysize);
+int crypto_chacha20_crypt(struct skcipher_request *req);
+
+#endif