Add decryptMime and refactor package structure

models/models.go

@@ -0,0 +1,32 @@
+package models
+
+
+//EncryptedSplit when encrypt attachemt
+type EncryptedSplit struct {
+	DataPacket []byte
+	KeyPacket  []byte
+	Algo       string
+}
+
+//SessionSplit splited session
+type SessionSplit struct {
+	Session []byte
+	Algo    string
+}
+
+//EncryptedSigned encrypt_sign_package
+type EncryptedSigned struct {
+	Encrypted string
+	Signature string
+}
+
+//DecryptSignedVerify decrypt_sign_verify
+type DecryptSignedVerify struct {
+	//clear text
+	Plaintext string
+	//bitmask verify status : 0
+	Verify int
+	//error message if verify failed
+	Message string
+}
+