start implementing crypto handling

crypto/crypto.go

@@ -0,0 +1,56 @@
+package crypto
+
+import (
+	"fmt"
+	"bytes"
+	"io"
+	"encoding/json"
+
+	"filippo.io/age"
+)
+
+type Password struct {
+	Service string `json:"Service"`
+	Url string `json:"Url"`
+	Username string `json:"Username"`
+	Password string `json:"Password"`
+	Tags []string `json:"Tags"`
+}
+
+func (p *Password) ToJson() ([]byte, error) {
+	return json.Marshal(p)
+}
+
+func GetPasswordFromJson(b []byte) (Password, error) {
+	var result Password
+	err := json.Unmarshal(b, result)
+
+	if err != nil {
+		return Password{}, err
+	}
+
+	return result, nil
+}
+
+func Encrypt() {
+	publicKey := "age1cy0su9fwf3gf9mw868g5yut09p6nytfmmnktexz2ya5uqg9vl9sss4euqm"
+	recipient, err := age.ParseX25519Recipient(publicKey)
+	if err != nil {
+		fmt.Printf("Failed to parse public key %q: %v", publicKey, err)
+	}
+
+	out := &bytes.Buffer{}
+
+	w, err := age.Encrypt(out, recipient)
+	if err != nil {
+		fmt.Printf("Failed to create encrypted file: %v\n", err)
+	}
+	if _, err := io.WriteString(w, "Black lives matter."); err != nil {
+		fmt.Printf("Failed to write to encrypted file: %v\n", err)
+	}
+	if err := w.Close(); err != nil {
+		fmt.Printf("Failed to close encrypted file: %v\n", err)
+	}
+
+	fmt.Printf("Encrypted file size: %d\n", out.Len())
+}