Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00.05 --> 00:00:02.06 - [Instructor] We've looked at the MASM32 assembler 2 00:00:02.06 --> 00:00:06.04 but we'll be using the GoAsm64 assembler from here on in. 3 00:00:06.04 --> 00:00:08.02 The assembler instructions are the same 4 00:00:08.02 --> 00:00:10.09 and the syntax is largely similar. 5 00:00:10.09 --> 00:00:12.05 With the coding examples now, 6 00:00:12.05 --> 00:00:13.05 we'll start to build up 7 00:00:13.05 --> 00:00:16.09 our file encryptor demonstration program. 8 00:00:16.09 --> 00:00:20.04 I've got a new GoAsm64 classic console project opened 9 00:00:20.04 --> 00:00:22.04 called an enigmatic. 10 00:00:22.04 --> 00:00:23.08 I'll make a couple of changes to 11 00:00:23.08 --> 00:00:26.05 the skeleton Easy Code provides. 12 00:00:26.05 --> 00:00:30.07 I'll change the constant null to zero 13 00:00:30.07 --> 00:00:35.05 and check change the code to call, GetModuleHandleA. 14 00:00:35.05 --> 00:00:36.06 At the machine level, 15 00:00:36.06 --> 00:00:39.00 our smallest data type is a byte 16 00:00:39.00 --> 00:00:42.02 which we define with the declaration DB. 17 00:00:42.02 --> 00:00:45.06 So in the data section we can, write, for example 18 00:00:45.06 --> 00:00:52.04 slot1 db, and we'll set it to the value five, 19 00:00:52.04 --> 00:00:57.09 slot2 db, we'll set that to the value two, 20 00:00:57.09 --> 00:01:04.00 slot3 db, and we'll set that to the value three. 21 00:01:04.00 --> 00:01:06.08 Sometimes it's useful to declare a number of variables 22 00:01:06.08 --> 00:01:08.06 each with the same value. 23 00:01:08.06 --> 00:01:11.03 We can do this with the juke keyword. 24 00:01:11.03 --> 00:01:14.01 For example, making a three byte array, 25 00:01:14.01 --> 00:01:16.01 each with the value one 26 00:01:16.01 --> 00:01:22.02 we can say settings db three bytes 27 00:01:22.02 --> 00:01:25.00 with a duplicated value of one. 28 00:01:25.00 --> 00:01:26.09 We've used standard decimal values to 29 00:01:26.09 --> 00:01:28.09 initialize these variables 30 00:01:28.09 --> 00:01:32.03 but sometimes we want to use a hexadecimal value. 31 00:01:32.03 --> 00:01:35.07 You can optionally proceed a hexadecimal value with a zero 32 00:01:35.07 --> 00:01:38.08 but it's necessary to add a suffix of h. 33 00:01:38.08 --> 00:01:45.06 For example, plug1 db 2Fh, 34 00:01:45.06 --> 00:01:50.03 plug2 db 16h. 35 00:01:50.03 --> 00:01:55.02 In MASM, we have a dot data question mark section. 36 00:01:55.02 --> 00:01:57.05 However, in GoAsm, if we don't want to initialize 37 00:01:57.05 --> 00:02:02.00 the variable we just declare it with a question mark. 38 00:02:02.00 --> 00:02:06.05 Rotten db question mark. 39 00:02:06.05 --> 00:02:09.00 The assembler doesn't have a string data type 40 00:02:09.00 --> 00:02:11.02 but as we've seen it does recognize a string 41 00:02:11.02 --> 00:02:12.09 as a sequence of bytes 42 00:02:12.09 --> 00:02:25.02 so we can use the welcome db Enigma style file encryptor. 43 00:02:25.02 --> 00:02:29.09 And this declares an array of bytes, which has length 27. 44 00:02:29.09 --> 00:02:33.00 We can also combine data declarations on a line, 45 00:02:33.00 --> 00:02:34.05 so we'll add a carriage return 46 00:02:34.05 --> 00:02:42.07 and line feed to the welcome line with 0Dh, 0Ah. 47 00:02:42.07 --> 00:02:44.04 We can declare a double bytes, 48 00:02:44.04 --> 00:02:48.06 a word in assembler terminology with a DW declaration 49 00:02:48.06 --> 00:02:53.00 and a 32 bit value with a double word DD declaration. 50 00:02:53.00 --> 00:02:57.01 We declare a full 64 bit value as DQ. 51 00:02:57.01 --> 00:02:59.09 Let's declare five quad-word rotor variables 52 00:02:59.09 --> 00:03:04.07 and initialize them with hexadecimal values. 53 00:03:04.07 --> 00:03:09.06 Okay, I'll save this now. 54 00:03:09.06 --> 00:03:11.09 Well, we won't be using them in this course. 55 00:03:11.09 --> 00:03:14.06 GoAsm also allows us to declare a variable 56 00:03:14.06 --> 00:03:17.09 of 10 bytes using the mnemonic DT. 4489