Added helpers with encrypted signatures and unarmored binary ciphertexts (#83)

* added signcryption for binary ciphertexts

* fixing merge issues

* removed newlines before error handling

Co-authored-by: marin thiercelin <marin.thiercelin@pm.me>

helper/mobile.go

@@ -84,10 +84,10 @@ func GetJsonSHA256Fingerprints(publicKey string) ([]byte, error) {
 }
 
 type EncryptSignArmoredDetachedMobileResult struct {
-	Ciphertext, EncryptedSignature string
+	CiphertextArmored, EncryptedSignatureArmored string
 }
 
-// EncryptSignArmoredDetachedMobile wraps the EncryptSignArmoredDetached method
+// EncryptSignArmoredDetachedMobile wraps the encryptSignArmoredDetached method
 // to have only one return argument for mobile.
 func EncryptSignArmoredDetachedMobile(
 	publicKey, privateKey string,
@@ -99,7 +99,28 @@ func EncryptSignArmoredDetachedMobile(
 	}
 
 	return &EncryptSignArmoredDetachedMobileResult{
-		Ciphertext:         ciphertext,
-		EncryptedSignature: encryptedSignature,
+		CiphertextArmored:         ciphertext,
+		EncryptedSignatureArmored: encryptedSignature,
+	}, nil
+}
+
+type EncryptSignBinaryDetachedMobileResult struct {
+	EncryptedData             []byte
+	EncryptedSignatureArmored string
+}
+
+// EncryptSignBinaryDetachedMobile wraps the encryptSignBinaryDetached method
+// to have only one return argument for mobile.
+func EncryptSignBinaryDetachedMobile(
+	publicKey, privateKey string,
+	passphrase, plainData []byte,
+) (wrappedTuple *EncryptSignBinaryDetachedMobileResult, err error) {
+	ciphertext, encryptedSignature, err := encryptSignBinaryDetached(publicKey, privateKey, passphrase, plainData)
+	if err != nil {
+		return nil, err
+	}
+	return &EncryptSignBinaryDetachedMobileResult{
+		EncryptedData:             ciphertext,
+		EncryptedSignatureArmored: encryptedSignature,
 	}, nil
 }