72 lines
1.8 KiB
Objective-C
72 lines
1.8 KiB
Objective-C
//
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// AESGcm.m
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// Monal
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//
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// Created by Anurodh Pokharel on 4/19/19.
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// Copyright © 2019 Monal.im. All rights reserved.
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//
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#import "MLConstants.h"
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#import "AESGcm.h"
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#import <monalxmpp/monalxmpp-Swift.h>
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@class MLCrypto;
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@implementation AESGcm
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+(MLEncryptedPayload*) encrypt:(NSData*) body keySize:(int) keySize
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{
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NSData* gcmKey = [self genKey:keySize];
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if(!gcmKey)
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{
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return nil;
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}
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return [self encrypt:body withKey:gcmKey];
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}
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+(MLEncryptedPayload*) encrypt:(NSData*) body withKey:(NSData*) gcmKey
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{
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MLCrypto* crypto = [MLCrypto new];
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EncryptedPayload* payload = [crypto encryptGCMWithKey:gcmKey decryptedContent:body];
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if(payload == nil)
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{
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return nil;
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}
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NSMutableData* combinedKey = [NSMutableData dataWithData:gcmKey];
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[combinedKey appendData:payload.tag];
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if(combinedKey == nil)
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{
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return nil;
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}
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return [[MLEncryptedPayload alloc] initWithBody:payload.body key:combinedKey iv:payload.iv authTag:payload.tag];
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}
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+(NSData*) genIV
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{
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MLCrypto* crypto = [MLCrypto new];
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return [crypto genIV];
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}
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+(NSData*) genKey:(int) keySize
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{
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uint8_t randomBytes[keySize];
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if(SecRandomCopyBytes(kSecRandomDefault, keySize, randomBytes) != 0)
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return nil;
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return [[NSData alloc] initWithBytes:randomBytes length:keySize];
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}
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+(NSData*) decrypt:(NSData*) body withKey:(NSData*) key andIv:(NSData*) iv withAuth:(NSData* _Nullable) auth
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{
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MLCrypto* crypto = [MLCrypto new];
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NSMutableData* combined = [NSMutableData new];
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[combined appendData:iv];
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[combined appendData:body];
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[combined appendData:auth]; //if auth is nil assume it already was apended to body
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NSData* toReturn = [crypto decryptGCMWithKey:key encryptedContent:combined];
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return toReturn;
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}
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@end
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