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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,5 @@ | ||
| zig-out | ||
| zig-cache | ||
| .zig-cache | ||
| *.swp | ||
| venv |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| const std = @import("std"); | ||
| const builtin = @import("builtin"); | ||
| const crypto = std.crypto; | ||
| const math = std.math; | ||
| const mem = std.mem; | ||
| const assert = std.debug.assert; | ||
| const testing = std.testing; | ||
| const maxInt = math.maxInt; | ||
|
|
||
| pub const ChaCha20 = struct { | ||
| ctx: BlockVec, | ||
| x: BlockVec, | ||
| left: usize, | ||
| buffer: [64]u8, | ||
|
|
||
| const BlockVec = [16]u32; | ||
|
|
||
| /// Nonce length in bytes. | ||
| pub const nonce_length = 12; | ||
| /// Key length in bytes. | ||
| pub const key_length = 32; | ||
| /// Block length in bytes. | ||
| pub const block_length = 64; | ||
| pub const rounds_nb = 20; | ||
|
|
||
| pub fn init(counter: u32, key_: [key_length]u8, nonce: [nonce_length]u8) @This() { | ||
| var d: [4]u32 = undefined; | ||
| d[0] = counter; | ||
| d[1] = mem.readInt(u32, nonce[0..4], .little); | ||
| d[2] = mem.readInt(u32, nonce[4..8], .little); | ||
| d[3] = mem.readInt(u32, nonce[8..12], .little); | ||
|
|
||
| const key = keyToWords(key_); | ||
|
|
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| const c = "expand 32-byte k"; | ||
| const constant_le = comptime [4]u32{ | ||
| mem.readInt(u32, c[0..4], .little), | ||
| mem.readInt(u32, c[4..8], .little), | ||
| mem.readInt(u32, c[8..12], .little), | ||
| mem.readInt(u32, c[12..16], .little), | ||
| }; | ||
| return .{ | ||
| .ctx = .{ | ||
| constant_le[0], constant_le[1], constant_le[2], constant_le[3], | ||
| key[0], key[1], key[2], key[3], | ||
| key[4], key[5], key[6], key[7], | ||
| d[0], d[1], d[2], d[3], | ||
| }, | ||
| .x = .{0} ** 16, | ||
| .left = 0, | ||
| .buffer = undefined, | ||
| }; | ||
| } | ||
|
|
||
| pub fn xor(self: *@This(), out: []u8) void { | ||
| var k: usize = 0; | ||
|
|
||
| while (k < out.len) { | ||
| if (self.left == 0) { | ||
| chacha20Core(self.x[0..], self.ctx); | ||
| contextFeedback(&self.x, self.ctx); | ||
| hashToBytes(self.buffer[0..64], self.x); | ||
| self.left = 64; | ||
| self.ctx[12] +%= 1; | ||
| } | ||
|
|
||
| out[k] ^= self.buffer[64 - self.left]; | ||
| k += 1; | ||
| self.left -= 1; | ||
| } | ||
| } | ||
|
|
||
| const QuarterRound = struct { | ||
| a: usize, | ||
| b: usize, | ||
| c: usize, | ||
| d: usize, | ||
| }; | ||
|
|
||
| fn Rp(a: usize, b: usize, c: usize, d: usize) QuarterRound { | ||
| return QuarterRound{ | ||
| .a = a, | ||
| .b = b, | ||
| .c = c, | ||
| .d = d, | ||
| }; | ||
| } | ||
|
|
||
| inline fn chacha20Core(x: *BlockVec, input: BlockVec) void { | ||
| x.* = input; | ||
|
|
||
| const rounds = comptime [_]QuarterRound{ | ||
| Rp(0, 4, 8, 12), | ||
| Rp(1, 5, 9, 13), | ||
| Rp(2, 6, 10, 14), | ||
| Rp(3, 7, 11, 15), | ||
| Rp(0, 5, 10, 15), | ||
| Rp(1, 6, 11, 12), | ||
| Rp(2, 7, 8, 13), | ||
| Rp(3, 4, 9, 14), | ||
| }; | ||
|
|
||
| comptime var j: usize = 0; | ||
| inline while (j < rounds_nb) : (j += 2) { | ||
| inline for (rounds) |r| { | ||
| x[r.a] +%= x[r.b]; | ||
| x[r.d] = math.rotl(u32, x[r.d] ^ x[r.a], @as(u32, 16)); | ||
| x[r.c] +%= x[r.d]; | ||
| x[r.b] = math.rotl(u32, x[r.b] ^ x[r.c], @as(u32, 12)); | ||
| x[r.a] +%= x[r.b]; | ||
| x[r.d] = math.rotl(u32, x[r.d] ^ x[r.a], @as(u32, 8)); | ||
| x[r.c] +%= x[r.d]; | ||
| x[r.b] = math.rotl(u32, x[r.b] ^ x[r.c], @as(u32, 7)); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| inline fn hashToBytes(out: *[64]u8, x: BlockVec) void { | ||
| for (0..4) |i| { | ||
| mem.writeInt(u32, out[16 * i + 0 ..][0..4], x[i * 4 + 0], .little); | ||
| mem.writeInt(u32, out[16 * i + 4 ..][0..4], x[i * 4 + 1], .little); | ||
| mem.writeInt(u32, out[16 * i + 8 ..][0..4], x[i * 4 + 2], .little); | ||
| mem.writeInt(u32, out[16 * i + 12 ..][0..4], x[i * 4 + 3], .little); | ||
| } | ||
| } | ||
|
|
||
| inline fn contextFeedback(x: *BlockVec, ctx: BlockVec) void { | ||
| for (0..16) |i| { | ||
| x[i] +%= ctx[i]; | ||
| } | ||
| } | ||
| }; | ||
|
|
||
| fn keyToWords(key: [32]u8) [8]u32 { | ||
| var k: [8]u32 = undefined; | ||
| for (0..8) |i| { | ||
| k[i] = mem.readInt(u32, key[i * 4 ..][0..4], .little); | ||
| } | ||
| return k; | ||
| } |
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