Add wrappers for iOS

helper/ios.go

@@ -0,0 +1,42 @@
+package helper
+
+import (
+	"github.com/ProtonMail/gopenpgp/crypto"
+)
+
+type ExplicitVerifyMessage struct {
+	Message *crypto.PlainMessage
+	SignatureVerificationError *crypto.SignatureVerificationError
+}
+
+// DecryptVerifyMessageArmored decrypts an armored PGP message given a private key and its passphrase
+// and verifies the embedded signature.
+// Returns the plain data or an error on signature verification failure.
+func DecryptExplicitVerify(
+	pgpMessage *crypto.PGPMessage,
+	privateKeyRing, publicKeyRing *crypto.KeyRing,
+	verifyTime int64,
+) (*ExplicitVerifyMessage, error) {
+	var explicitVerify *ExplicitVerifyMessage
+
+	message, err := privateKeyRing.Decrypt(pgpMessage, publicKeyRing, verifyTime);
+
+	if err != nil {
+		castedErr, isType := err.(crypto.SignatureVerificationError)
+		if !isType {
+			return nil, err
+		}
+
+		explicitVerify = &ExplicitVerifyMessage{
+			Message: message,
+			SignatureVerificationError: &castedErr,
+		}
+	} else {
+		explicitVerify = &ExplicitVerifyMessage{
+			Message: message,
+			SignatureVerificationError: nil,
+		}
+	}
+
+	return explicitVerify, nil
+}