new: vendor godicttls package (#265)

For better maintainability we decided to vendor this package instead of importing it.

dicttls/signaturealgorithm.go

@@ -0,0 +1,41 @@
+package dicttls
+
+// Note: values in this file was used in TLS 1.2's signature_algorithms extension
+// in combination with the values in hashalgorithm.go.
+// signature_algorithms extension in TLS 1.3 uses values in signaturescheme.go
+
+// source: https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-16
+// last updated: March 2023
+
+const (
+	SigAlg_anonymous         uint8 = 0 // deprecated in TLS 1.3
+	SigAlg_rsa               uint8 = 1
+	SigAlg_dsa               uint8 = 2 // deprecated in TLS 1.3
+	SigAlg_ecdsa             uint8 = 3
+	SigAlg_ed25519           uint8 = 7
+	SigAlg_ed448             uint8 = 8
+	SigAlg_gostr34102012_256 uint8 = 64 // value changed in TLS 1.3, to 0x0709-0x070C
+	SigAlg_gostr34102012_512 uint8 = 65 // value changed in TLS 1.3, to 0x070D-0x070F
+)
+
+var DictSignatureAlgorithmValueIndexed = map[uint8]string{
+	0:  "anonymous",
+	1:  "rsa",
+	2:  "dsa",
+	3:  "ecdsa",
+	7:  "ed25519",
+	8:  "ed448",
+	64: "gostr34102012_256",
+	65: "gostr34102012_512",
+}
+
+var DictSignatureAlgorithmNameIndexed = map[string]uint8{
+	"anonymous":         0,
+	"rsa":               1,
+	"dsa":               2,
+	"ecdsa":             3,
+	"ed25519":           7,
+	"ed448":             8,
+	"gostr34102012_256": 64,
+	"gostr34102012_512": 65,
+}