crypto: inside-secure - Add support for the Chacha20-Poly1305 AEAD

This patch adds support for the Chacha20-Poly1305 cipher suite.
It adds both the basic rfc7539(chacha20,poly1305) as well as the
rfc7539esp(chacha20,poly1305) variant for IPsec ESP acceleration.

changes since v1:
- rebased on top of DES library changes done on cryptodev/master
- fixed crypto/Kconfig so that generic fallback is compiled as well

changes since v2:
- nothing

changes since v3:
- Fixed a problem where the tcrypt performance test would run fully on the
  fallback cipher instead of the HW due to using an AAD length of 8 for
  rfc7539esp. While this is not actually legal ESP (which includes SPI and
  sequence number in the AAD as well), it is both inconvenient and not
  necessary to run these vectors on the fallback cipher.
- Due to above, also realised that for plain (non-ESP) rfc7539, you
  probably want to be able to run vectors with less than 8 bytes of AAD
  on the HW, and this is actually possible as long as cryptlen is large
  enough, so made that possible as well.
Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/inside-secure/safexcel.c

@@ -1174,6 +1174,8 @@ static struct safexcel_alg_template *safexcel_algs[] = {
 	&safexcel_alg_xcbcmac,
 	&safexcel_alg_cmac,
 	&safexcel_alg_chacha20,
+	&safexcel_alg_chachapoly,
+	&safexcel_alg_chachapoly_esp,
 };
 
 static int safexcel_register_algorithms(struct safexcel_crypto_priv *priv)

drivers/crypto/inside-secure/safexcel.h

@@ -373,6 +373,7 @@ struct safexcel_context_record {
 #define CONTEXT_CONTROL_CRYPTO_ALG_XCBC128	(0x1 << 23)
 #define CONTEXT_CONTROL_CRYPTO_ALG_XCBC192	(0x2 << 23)
 #define CONTEXT_CONTROL_CRYPTO_ALG_XCBC256	(0x3 << 23)
+#define CONTEXT_CONTROL_CRYPTO_ALG_POLY1305	(0xf << 23)
 #define CONTEXT_CONTROL_INV_FR			(0x5 << 24)
 #define CONTEXT_CONTROL_INV_TR			(0x6 << 24)
 
@@ -385,6 +386,7 @@ struct safexcel_context_record {
 #define CONTEXT_CONTROL_CRYPTO_MODE_CTR_LOAD	(6 << 0)
 #define CONTEXT_CONTROL_CRYPTO_MODE_XTS		(7 << 0)
 #define CONTEXT_CONTROL_CRYPTO_MODE_XCM		((6 << 0) | BIT(17))
+#define CONTEXT_CONTROL_CHACHA20_MODE_CALC_OTK	(12 << 0)
 #define CONTEXT_CONTROL_IV0			BIT(5)
 #define CONTEXT_CONTROL_IV1			BIT(6)
 #define CONTEXT_CONTROL_IV2			BIT(7)
@@ -397,6 +399,10 @@ struct safexcel_context_record {
 #define EIP197_XCM_MODE_GCM			1
 #define EIP197_XCM_MODE_CCM			2
 
+#define EIP197_AEAD_TYPE_IPSEC_ESP		2
+#define EIP197_AEAD_IPSEC_IV_SIZE		8
+#define EIP197_AEAD_IPSEC_NONCE_SIZE		4
+
 /* The hash counter given to the engine in the context has a granularity of
  * 64 bits.
  */
@@ -861,5 +867,7 @@ extern struct safexcel_alg_template safexcel_alg_cbcmac;
 extern struct safexcel_alg_template safexcel_alg_xcbcmac;
 extern struct safexcel_alg_template safexcel_alg_cmac;
 extern struct safexcel_alg_template safexcel_alg_chacha20;
+extern struct safexcel_alg_template safexcel_alg_chachapoly;
+extern struct safexcel_alg_template safexcel_alg_chachapoly_esp;
 
 #endif