gistfile1.m

#import "IPBinaryEncrypter.h"

#define BUFFER_SIZE 1024

@implementation IPBinaryEncrypter

// Yes, let's try new curly brackets style :)
// and see if I can improve 7 years of coding
- (void) decryptFile:(NSString *)filePath
      withCompletion:(void (^)(void))completion
             failure:(void (^)(void))failure
{    
    NSString *outputPath = [filePath stringByAppendingString:@"_dec.zip"];
    
    __block NSOutputStream *outputStream = [[NSOutputStream alloc] initToFileAtPath:outputPath append:YES];
    __block NSError *decryptionError = nil;
    [outputStream open];
    
    __block NSUInteger totalBytesRead = 0;
    
    RNOpenSSLDecryptor *decryptor = [[RNOpenSSLDecryptor alloc] initWithSettings:kRNCryptorAES256Settings
                                                                        password:@"1234"
                                                                         handler:^(RNCryptor *cryptor, NSData *data)
    {
        totalBytesRead += data.length;
        [outputStream write:data.bytes maxLength:data.length];
        if (cryptor.isFinished)
        {
            //close the outputStream
            [outputStream close];
            decryptionError = cryptor.error;
            completion();
        }
    }];
    
    NSInputStream *inputStream = [NSInputStream inputStreamWithFileAtPath:filePath];
    [inputStream open];
    Byte buffer[BUFFER_SIZE];
    while ([inputStream hasBytesAvailable])
    {
        int bytesRead = [inputStream read:buffer maxLength:BUFFER_SIZE];
        NSData *data = [NSData dataWithBytes:buffer length:bytesRead];
        [decryptor addData:data];
    }
    [decryptor finish];
    [inputStream close];
}

- (void) encryptFile:(NSString *)filePath
      withCompletion:(void (^)(void))completion
             failure:(void (^)(void))failure
{
    NSString *outputPath = [filePath stringByAppendingString:@"_enc.zip"];
    
    __block NSOutputStream *outputStream = [[NSOutputStream alloc] initToFileAtPath:outputPath append:YES];
    __block NSError *decryptionError = nil;
    [outputStream open];
    
    __block NSUInteger totalBytesRead = 0;
    
    RNOpenSSLEncryptor *encryptor = [[RNOpenSSLEncryptor alloc] initWithSettings:kRNCryptorAES256Settings
                                                                        password:@"1234"
                                                                         handler:^(RNCryptor *cryptor, NSData *data)
                                     {
                                         totalBytesRead += data.length;
                                         [outputStream write:data.bytes maxLength:data.length];
                                         if (cryptor.isFinished)
                                         {
                                             //close the outputStream
                                             [outputStream close];
                                             decryptionError = cryptor.error;
                                             completion();
                                         }
                                     }];
    
    NSInputStream *inputStream = [NSInputStream inputStreamWithFileAtPath:filePath];
    [inputStream open];
    Byte buffer[BUFFER_SIZE];
    while ([inputStream hasBytesAvailable])
    {
        int bytesRead = [inputStream read:buffer maxLength:BUFFER_SIZE];
        NSData *data = [NSData dataWithBytes:buffer length:bytesRead];
        [encryptor addData:data];
    }
    [encryptor finish];
    [inputStream close];

}
@end