net/tls: add CHACHA20-POLY1305 specific defines and structures

To provide support for ChaCha-Poly cipher we need to define
specific constants and structures.
Signed-off-by: NVadim Fedorenko <vfedorenko@novek.ru>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>

include/net/tls.h

@@ -211,6 +211,7 @@ union tls_crypto_context {
 	union {
 		struct tls12_crypto_info_aes_gcm_128 aes_gcm_128;
 		struct tls12_crypto_info_aes_gcm_256 aes_gcm_256;
+		struct tls12_crypto_info_chacha20_poly1305 chacha20_poly1305;
 	};
 };
 

include/uapi/linux/tls.h

@@ -77,6 +77,13 @@
 #define TLS_CIPHER_AES_CCM_128_TAG_SIZE		16
 #define TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE		8
 
+#define TLS_CIPHER_CHACHA20_POLY1305			54
+#define TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE		12
+#define TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE	32
+#define TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE		0
+#define TLS_CIPHER_CHACHA20_POLY1305_TAG_SIZE	16
+#define TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE	8
+
 #define TLS_SET_RECORD_TYPE	1
 #define TLS_GET_RECORD_TYPE	2
 
@@ -109,6 +116,14 @@ struct tls12_crypto_info_aes_ccm_128 {
 	unsigned char rec_seq[TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE];
 };
 
+struct tls12_crypto_info_chacha20_poly1305 {
+	struct tls_crypto_info info;
+	unsigned char iv[TLS_CIPHER_CHACHA20_POLY1305_IV_SIZE];
+	unsigned char key[TLS_CIPHER_CHACHA20_POLY1305_KEY_SIZE];
+	unsigned char salt[TLS_CIPHER_CHACHA20_POLY1305_SALT_SIZE];
+	unsigned char rec_seq[TLS_CIPHER_CHACHA20_POLY1305_REC_SEQ_SIZE];
+};
+
 enum {
 	TLS_INFO_UNSPEC,
 	TLS_INFO_VERSION,