Optimize encrypt attachment

dist/iOS/Crypto.framework/Versions/A/Headers/Key.objc.h

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+// Objective-C API for talking to gitlab.com/ProtonMail/go-pm-crypto/key Go package.
+//   gobind -lang=objc gitlab.com/ProtonMail/go-pm-crypto/key
+//
+// File is generated by gobind. Do not edit.
+
+#ifndef __Key_H__
+#define __Key_H__
+
+@import Foundation;
+#include "Universe.objc.h"
+
+#include "Armor.objc.h"
+
+/**
+ * CheckPassphrase check is private key passphrase ok
+ */
+FOUNDATION_EXPORT BOOL KeyCheckPassphrase(NSString* privateKey, NSString* passphrase);
+
+/**
+ * GetFingerprint get a armored public key fingerprint
+ */
+FOUNDATION_EXPORT NSString* KeyGetFingerprint(NSString* publicKey, NSError** error);
+
+/**
+ * GetFingerprintBinKey get a unarmored public key fingerprint
+ */
+FOUNDATION_EXPORT NSString* KeyGetFingerprintBinKey(NSData* publicKey, NSError** error);
+
+/**
+ * PublicKey get a public key from a private key
+ */
+FOUNDATION_EXPORT NSString* KeyPublicKey(NSString* privateKey, NSError** error);
+
+/**
+ * PublicKeyBinOut get a public key from a private key
+ */
+FOUNDATION_EXPORT NSData* KeyPublicKeyBinOut(NSString* privateKey, NSError** error);
+
+#endif