It is a simple example of using RNCryptor for private usage. Just share as is.
NSError* error;
NSData* encryptedData = [NSData dataWithContentsOfFile:filePath];
NSData* decryptedData = [RNDecryptor decryptData:encryptedData
withPassword:@"SAMPLE-KEY"
error:&error];
UIImage* image = [UIImage imageWithData:decryptedData];