1 files changed, 305 insertions, 0 deletions
diff --git a/lib/std/crypto/sha3.zig b/lib/std/crypto/sha3.zig
new file mode 100644
index 0000000000..659e7a254f
--- /dev/null
+++ b/lib/std/crypto/sha3.zig
@@ -0,0 +1,305 @@
+const mem = @import("../mem.zig");
+const math = @import("../math.zig");
+const endian = @import("../endian.zig");
+const debug = @import("../debug.zig");
+const builtin = @import("builtin");
+const htest = @import("test.zig");
+
+pub const Sha3_224 = Keccak(224, 0x06);
+pub const Sha3_256 = Keccak(256, 0x06);
+pub const Sha3_384 = Keccak(384, 0x06);
+pub const Sha3_512 = Keccak(512, 0x06);
+
+fn Keccak(comptime bits: usize, comptime delim: u8) type {
+    return struct {
+        const Self = @This();
+        pub const block_length = 200;
+        pub const digest_length = bits / 8;
+
+        s: [200]u8,
+        offset: usize,
+        rate: usize,
+
+        pub fn init() Self {
+            var d: Self = undefined;
+            d.reset();
+            return d;
+        }
+
+        pub fn reset(d: *Self) void {
+            mem.set(u8, d.s[0..], 0);
+            d.offset = 0;
+            d.rate = 200 - (bits / 4);
+        }
+
+        pub fn hash(b: []const u8, out: []u8) void {
+            var d = Self.init();
+            d.update(b);
+            d.final(out);
+        }
+
+        pub fn update(d: *Self, b: []const u8) void {
+            var ip: usize = 0;
+            var len = b.len;
+            var rate = d.rate - d.offset;
+            var offset = d.offset;
+
+            // absorb
+            while (len >= rate) {
+                for (d.s[offset .. offset + rate]) |*r, i|
+                    r.* ^= b[ip..][i];
+
+                keccak_f(1600, d.s[0..]);
+
+                ip += rate;
+                len -= rate;
+                rate = d.rate;
+                offset = 0;
+            }
+
+            for (d.s[offset .. offset + len]) |*r, i|
+                r.* ^= b[ip..][i];
+
+            d.offset = offset + len;
+        }
+
+        pub fn final(d: *Self, out: []u8) void {
+            // padding
+            d.s[d.offset] ^= delim;
+            d.s[d.rate - 1] ^= 0x80;
+
+            keccak_f(1600, d.s[0..]);
+
+            // squeeze
+            var op: usize = 0;
+            var len: usize = bits / 8;
+
+            while (len >= d.rate) {
+                mem.copy(u8, out[op..], d.s[0..d.rate]);
+                keccak_f(1600, d.s[0..]);
+                op += d.rate;
+                len -= d.rate;
+            }
+
+            mem.copy(u8, out[op..], d.s[0..len]);
+        }
+    };
+}
+
+const RC = [_]u64{
+    0x0000000000000001, 0x0000000000008082, 0x800000000000808a, 0x8000000080008000,
+    0x000000000000808b, 0x0000000080000001, 0x8000000080008081, 0x8000000000008009,
+    0x000000000000008a, 0x0000000000000088, 0x0000000080008009, 0x000000008000000a,
+    0x000000008000808b, 0x800000000000008b, 0x8000000000008089, 0x8000000000008003,
+    0x8000000000008002, 0x8000000000000080, 0x000000000000800a, 0x800000008000000a,
+    0x8000000080008081, 0x8000000000008080, 0x0000000080000001, 0x8000000080008008,
+};
+
+const ROTC = [_]usize{
+    1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44,
+};
+
+const PIL = [_]usize{
+    10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4, 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1,
+};
+
+const M5 = [_]usize{
+    0, 1, 2, 3, 4, 0, 1, 2, 3, 4,
+};
+
+fn keccak_f(comptime F: usize, d: []u8) void {
+    debug.assert(d.len == F / 8);
+
+    const B = F / 25;
+    const no_rounds = comptime x: {
+        break :x 12 + 2 * math.log2(B);
+    };
+
+    var s = [_]u64{0} ** 25;
+    var t = [_]u64{0} ** 1;
+    var c = [_]u64{0} ** 5;
+
+    for (s) |*r, i| {
+        r.* = mem.readIntSliceLittle(u64, d[8 * i .. 8 * i + 8]);
+    }
+
+    comptime var x: usize = 0;
+    comptime var y: usize = 0;
+    for (RC[0..no_rounds]) |round| {
+        // theta
+        x = 0;
+        inline while (x < 5) : (x += 1) {
+            c[x] = s[x] ^ s[x + 5] ^ s[x + 10] ^ s[x + 15] ^ s[x + 20];
+        }
+        x = 0;
+        inline while (x < 5) : (x += 1) {
+            t[0] = c[M5[x + 4]] ^ math.rotl(u64, c[M5[x + 1]], usize(1));
+            y = 0;
+            inline while (y < 5) : (y += 1) {
+                s[x + y * 5] ^= t[0];
+            }
+        }
+
+        // rho+pi
+        t[0] = s[1];
+        x = 0;
+        inline while (x < 24) : (x += 1) {
+            c[0] = s[PIL[x]];
+            s[PIL[x]] = math.rotl(u64, t[0], ROTC[x]);
+            t[0] = c[0];
+        }
+
+        // chi
+        y = 0;
+        inline while (y < 5) : (y += 1) {
+            x = 0;
+            inline while (x < 5) : (x += 1) {
+                c[x] = s[x + y * 5];
+            }
+            x = 0;
+            inline while (x < 5) : (x += 1) {
+                s[x + y * 5] = c[x] ^ (~c[M5[x + 1]] & c[M5[x + 2]]);
+            }
+        }
+
+        // iota
+        s[0] ^= round;
+    }
+
+    for (s) |r, i| {
+        // TODO https://github.com/ziglang/zig/issues/863
+        mem.writeIntSliceLittle(u64, d[8 * i .. 8 * i + 8], r);
+    }
+}
+
+test "sha3-224 single" {
+    htest.assertEqualHash(Sha3_224, "6b4e03423667dbb73b6e15454f0eb1abd4597f9a1b078e3f5b5a6bc7", "");
+    htest.assertEqualHash(Sha3_224, "e642824c3f8cf24ad09234ee7d3c766fc9a3a5168d0c94ad73b46fdf", "abc");
+    htest.assertEqualHash(Sha3_224, "543e6868e1666c1a643630df77367ae5a62a85070a51c14cbf665cbc", "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu");
+}
+
+test "sha3-224 streaming" {
+    var h = Sha3_224.init();
+    var out: [28]u8 = undefined;
+
+    h.final(out[0..]);
+    htest.assertEqual("6b4e03423667dbb73b6e15454f0eb1abd4597f9a1b078e3f5b5a6bc7", out[0..]);
+
+    h.reset();
+    h.update("abc");
+    h.final(out[0..]);
+    htest.assertEqual("e642824c3f8cf24ad09234ee7d3c766fc9a3a5168d0c94ad73b46fdf", out[0..]);
+
+    h.reset();
+    h.update("a");
+    h.update("b");
+    h.update("c");
+    h.final(out[0..]);
+    htest.assertEqual("e642824c3f8cf24ad09234ee7d3c766fc9a3a5168d0c94ad73b46fdf", out[0..]);
+}
+
+test "sha3-256 single" {
+    htest.assertEqualHash(Sha3_256, "a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a", "");
+    htest.assertEqualHash(Sha3_256, "3a985da74fe225b2045c172d6bd390bd855f086e3e9d525b46bfe24511431532", "abc");
+    htest.assertEqualHash(Sha3_256, "916f6061fe879741ca6469b43971dfdb28b1a32dc36cb3254e812be27aad1d18", "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu");
+}
+
+test "sha3-256 streaming" {
+    var h = Sha3_256.init();
+    var out: [32]u8 = undefined;
+
+    h.final(out[0..]);
+    htest.assertEqual("a7ffc6f8bf1ed76651c14756a061d662f580ff4de43b49fa82d80a4b80f8434a", out[0..]);
+
+    h.reset();
+    h.update("abc");
+    h.final(out[0..]);
+    htest.assertEqual("3a985da74fe225b2045c172d6bd390bd855f086e3e9d525b46bfe24511431532", out[0..]);
+
+    h.reset();
+    h.update("a");
+    h.update("b");
+    h.update("c");
+    h.final(out[0..]);
+    htest.assertEqual("3a985da74fe225b2045c172d6bd390bd855f086e3e9d525b46bfe24511431532", out[0..]);
+}
+
+test "sha3-256 aligned final" {
+    var block = [_]u8{0} ** Sha3_256.block_length;
+    var out: [Sha3_256.digest_length]u8 = undefined;
+
+    var h = Sha3_256.init();
+    h.update(block);
+    h.final(out[0..]);
+}
+
+test "sha3-384 single" {
+    const h1 = "0c63a75b845e4f7d01107d852e4c2485c51a50aaaa94fc61995e71bbee983a2ac3713831264adb47fb6bd1e058d5f004";
+    htest.assertEqualHash(Sha3_384, h1, "");
+    const h2 = "ec01498288516fc926459f58e2c6ad8df9b473cb0fc08c2596da7cf0e49be4b298d88cea927ac7f539f1edf228376d25";
+    htest.assertEqualHash(Sha3_384, h2, "abc");
+    const h3 = "79407d3b5916b59c3e30b09822974791c313fb9ecc849e406f23592d04f625dc8c709b98b43b3852b337216179aa7fc7";
+    htest.assertEqualHash(Sha3_384, h3, "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu");
+}
+
+test "sha3-384 streaming" {
+    var h = Sha3_384.init();
+    var out: [48]u8 = undefined;
+
+    const h1 = "0c63a75b845e4f7d01107d852e4c2485c51a50aaaa94fc61995e71bbee983a2ac3713831264adb47fb6bd1e058d5f004";
+    h.final(out[0..]);
+    htest.assertEqual(h1, out[0..]);
+
+    const h2 = "ec01498288516fc926459f58e2c6ad8df9b473cb0fc08c2596da7cf0e49be4b298d88cea927ac7f539f1edf228376d25";
+    h.reset();
+    h.update("abc");
+    h.final(out[0..]);
+    htest.assertEqual(h2, out[0..]);
+
+    h.reset();
+    h.update("a");
+    h.update("b");
+    h.update("c");
+    h.final(out[0..]);
+    htest.assertEqual(h2, out[0..]);
+}
+
+test "sha3-512 single" {
+    const h1 = "a69f73cca23a9ac5c8b567dc185a756e97c982164fe25859e0d1dcc1475c80a615b2123af1f5f94c11e3e9402c3ac558f500199d95b6d3e301758586281dcd26";
+    htest.assertEqualHash(Sha3_512, h1, "");
+    const h2 = "b751850b1a57168a5693cd924b6b096e08f621827444f70d884f5d0240d2712e10e116e9192af3c91a7ec57647e3934057340b4cf408d5a56592f8274eec53f0";
+    htest.assertEqualHash(Sha3_512, h2, "abc");
+    const h3 = "afebb2ef542e6579c50cad06d2e578f9f8dd6881d7dc824d26360feebf18a4fa73e3261122948efcfd492e74e82e2189ed0fb440d187f382270cb455f21dd185";
+    htest.assertEqualHash(Sha3_512, h3, "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu");
+}
+
+test "sha3-512 streaming" {
+    var h = Sha3_512.init();
+    var out: [64]u8 = undefined;
+
+    const h1 = "a69f73cca23a9ac5c8b567dc185a756e97c982164fe25859e0d1dcc1475c80a615b2123af1f5f94c11e3e9402c3ac558f500199d95b6d3e301758586281dcd26";
+    h.final(out[0..]);
+    htest.assertEqual(h1, out[0..]);
+
+    const h2 = "b751850b1a57168a5693cd924b6b096e08f621827444f70d884f5d0240d2712e10e116e9192af3c91a7ec57647e3934057340b4cf408d5a56592f8274eec53f0";
+    h.reset();
+    h.update("abc");
+    h.final(out[0..]);
+    htest.assertEqual(h2, out[0..]);
+
+    h.reset();
+    h.update("a");
+    h.update("b");
+    h.update("c");
+    h.final(out[0..]);
+    htest.assertEqual(h2, out[0..]);
+}
+
+test "sha3-512 aligned final" {
+    var block = [_]u8{0} ** Sha3_512.block_length;
+    var out: [Sha3_512.digest_length]u8 = undefined;
+
+    var h = Sha3_512.init();
+    h.update(block);
+    h.final(out[0..]);
+}