install go2rtc on bob

installs_on_host/go2rtc/pkg/hap/chacha20poly1305/chacha20poly1305.go

@@ -0,0 +1,51 @@
+package chacha20poly1305
+
+import (
+	"errors"
+
+	"golang.org/x/crypto/chacha20poly1305"
+)
+
+var ErrInvalidParams = errors.New("chacha20poly1305: invalid params")
+
+// Decrypt - decrypt without verify
+func Decrypt(key32 []byte, nonce8 string, ciphertext []byte) ([]byte, error) {
+	return DecryptAndVerify(key32, nil, []byte(nonce8), ciphertext, nil)
+}
+
+// Encrypt - encrypt without seal
+func Encrypt(key32 []byte, nonce8 string, plaintext []byte) ([]byte, error) {
+	return EncryptAndSeal(key32, nil, []byte(nonce8), plaintext, nil)
+}
+
+func DecryptAndVerify(key32, dst, nonce8, ciphertext, verify []byte) ([]byte, error) {
+	if len(key32) != chacha20poly1305.KeySize || len(nonce8) != 8 {
+		return nil, ErrInvalidParams
+	}
+
+	aead, err := chacha20poly1305.New(key32)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce := make([]byte, chacha20poly1305.NonceSize)
+	copy(nonce[4:], nonce8)
+
+	return aead.Open(dst, nonce, ciphertext, verify)
+}
+
+func EncryptAndSeal(key32, dst, nonce8, plaintext, verify []byte) ([]byte, error) {
+	if len(key32) != chacha20poly1305.KeySize || len(nonce8) != 8 {
+		return nil, ErrInvalidParams
+	}
+
+	aead, err := chacha20poly1305.New(key32)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce := make([]byte, chacha20poly1305.NonceSize)
+	copy(nonce[4:], nonce8)
+
+	return aead.Seal(dst, nonce, plaintext, verify), nil
+}