Fix params to reflect changes in XChaCha20-Blake2b-SIV.

Author: danielhavir

params.go

@@ -93,7 +93,7 @@ func GetParams(mode byte) (*Params, error) {
 			curve: ecdh.Generic(elliptic.P256()),
 			// bitSize: 256,
 			hashFn:      sha256.New,
-			nk:          64,
+			nk:          32,
 			nh:          32,
 			ciphersuite: 7,
 			mode:        mode_base,
@@ -129,7 +129,7 @@ func GetParams(mode byte) (*Params, error) {
 			curve: ecdh.Generic(elliptic.P256()),
 			// bitSize: 256,
 			hashFn:      sha256.New,
-			nk:          64,
+			nk:          32,
 			nh:          32,
 			ciphersuite: 7,
 			mode:        mode_psk,
@@ -165,7 +165,7 @@ func GetParams(mode byte) (*Params, error) {
 			curve: ecdh.Generic(elliptic.P256()),
 			// bitSize: 256,
 			hashFn:      sha256.New,
-			nk:          64,
+			nk:          32,
 			nh:          32,
 			ciphersuite: 7,
 			mode:        mode_auth,
@@ -201,7 +201,7 @@ func GetParams(mode byte) (*Params, error) {
 			curve: ecdh.X25519(),
 			// bitSize: 256,
 			hashFn:      sha256.New,
-			nk:          64,
+			nk:          32,
 			nh:          32,
 			ciphersuite: 8,
 			mode:        mode_base,
@@ -237,7 +237,7 @@ func GetParams(mode byte) (*Params, error) {
 			curve: ecdh.X25519(),
 			// bitSize: 256,
 			hashFn:      sha256.New,
-			nk:          64,
+			nk:          32,
 			nh:          32,
 			ciphersuite: 8,
 			mode:        mode_psk,
@@ -273,7 +273,7 @@ func GetParams(mode byte) (*Params, error) {
 			curve: ecdh.X25519(),
 			// bitSize: 256,
 			hashFn:      sha256.New,
-			nk:          64,
+			nk:          32,
 			nh:          32,
 			ciphersuite: 8,
 			mode:        mode_auth,
@@ -306,7 +306,7 @@ func GetParams(mode byte) (*Params, error) {
 		return &Params{
 			curve:       ecdh.Generic(elliptic.P521()),
 			hashFn:      sha256.New,
-			nk:          64,
+			nk:          32,
 			nh:          32,
 			ciphersuite: 9,
 			mode:        mode_base,
@@ -339,7 +339,7 @@ func GetParams(mode byte) (*Params, error) {
 		return &Params{
 			curve:       ecdh.Generic(elliptic.P521()),
 			hashFn:      sha256.New,
-			nk:          64,
+			nk:          32,
 			nh:          32,
 			ciphersuite: 9,
 			mode:        mode_psk,
@@ -372,7 +372,7 @@ func GetParams(mode byte) (*Params, error) {
 		return &Params{
 			curve:       ecdh.Generic(elliptic.P521()),
 			hashFn:      sha256.New,
-			nk:          64,
+			nk:          32,
 			nh:          32,
 			ciphersuite: 9,
 			mode:        mode_auth,