feature. See also
. The project being documented here (as the example) is the Zig library itself.
Sha1.round
fn round(d: *Sha1, b: *const [64]u8) void
File
Code
fn round(d: *Sha1, b: *const [64]u8) void {
var s: [16]u32 = undefined;
var v: [5]u32 = [_]u32{
d.s[0],
d.s[1],
d.s[2],
d.s[3],
d.s[4],
};
const round0a = comptime [_]RoundParam{
.abcdei(0, 1, 2, 3, 4, 0),
.abcdei(4, 0, 1, 2, 3, 1),
.abcdei(3, 4, 0, 1, 2, 2),
.abcdei(2, 3, 4, 0, 1, 3),
.abcdei(1, 2, 3, 4, 0, 4),
.abcdei(0, 1, 2, 3, 4, 5),
.abcdei(4, 0, 1, 2, 3, 6),
.abcdei(3, 4, 0, 1, 2, 7),
.abcdei(2, 3, 4, 0, 1, 8),
.abcdei(1, 2, 3, 4, 0, 9),
.abcdei(0, 1, 2, 3, 4, 10),
.abcdei(4, 0, 1, 2, 3, 11),
.abcdei(3, 4, 0, 1, 2, 12),
.abcdei(2, 3, 4, 0, 1, 13),
.abcdei(1, 2, 3, 4, 0, 14),
.abcdei(0, 1, 2, 3, 4, 15),
};
inline for (round0a) |r| {
s[r.i] = mem.readInt(u32, b[r.i * 4 ..][0..4], .big);
v[r.e] = v[r.e] +% math.rotl(u32, v[r.a], @as(u32, 5)) +% 0x5A827999 +% s[r.i & 0xf] +% ((v[r.b] & v[r.c]) | (~v[r.b] & v[r.d]));
v[r.b] = math.rotl(u32, v[r.b], @as(u32, 30));
}
const round0b = comptime [_]RoundParam{
.abcdei(4, 0, 1, 2, 3, 16),
.abcdei(3, 4, 0, 1, 2, 17),
.abcdei(2, 3, 4, 0, 1, 18),
.abcdei(1, 2, 3, 4, 0, 19),
};
inline for (round0b) |r| {
const t = s[(r.i - 3) & 0xf] ^ s[(r.i - 8) & 0xf] ^ s[(r.i - 14) & 0xf] ^ s[(r.i - 16) & 0xf];
s[r.i & 0xf] = math.rotl(u32, t, @as(u32, 1));
v[r.e] = v[r.e] +% math.rotl(u32, v[r.a], @as(u32, 5)) +% 0x5A827999 +% s[r.i & 0xf] +% ((v[r.b] & v[r.c]) | (~v[r.b] & v[r.d]));
v[r.b] = math.rotl(u32, v[r.b], @as(u32, 30));
}
const round1 = comptime [_]RoundParam{
.abcdei(0, 1, 2, 3, 4, 20),
.abcdei(4, 0, 1, 2, 3, 21),
.abcdei(3, 4, 0, 1, 2, 22),
.abcdei(2, 3, 4, 0, 1, 23),
.abcdei(1, 2, 3, 4, 0, 24),
.abcdei(0, 1, 2, 3, 4, 25),
.abcdei(4, 0, 1, 2, 3, 26),
.abcdei(3, 4, 0, 1, 2, 27),
.abcdei(2, 3, 4, 0, 1, 28),
.abcdei(1, 2, 3, 4, 0, 29),
.abcdei(0, 1, 2, 3, 4, 30),
.abcdei(4, 0, 1, 2, 3, 31),
.abcdei(3, 4, 0, 1, 2, 32),
.abcdei(2, 3, 4, 0, 1, 33),
.abcdei(1, 2, 3, 4, 0, 34),
.abcdei(0, 1, 2, 3, 4, 35),
.abcdei(4, 0, 1, 2, 3, 36),
.abcdei(3, 4, 0, 1, 2, 37),
.abcdei(2, 3, 4, 0, 1, 38),
.abcdei(1, 2, 3, 4, 0, 39),
};
inline for (round1) |r| {
const t = s[(r.i - 3) & 0xf] ^ s[(r.i - 8) & 0xf] ^ s[(r.i - 14) & 0xf] ^ s[(r.i - 16) & 0xf];
s[r.i & 0xf] = math.rotl(u32, t, @as(u32, 1));
v[r.e] = v[r.e] +% math.rotl(u32, v[r.a], @as(u32, 5)) +% 0x6ED9EBA1 +% s[r.i & 0xf] +% (v[r.b] ^ v[r.c] ^ v[r.d]);
v[r.b] = math.rotl(u32, v[r.b], @as(u32, 30));
}
const round2 = comptime [_]RoundParam{
.abcdei(0, 1, 2, 3, 4, 40),
.abcdei(4, 0, 1, 2, 3, 41),
.abcdei(3, 4, 0, 1, 2, 42),
.abcdei(2, 3, 4, 0, 1, 43),
.abcdei(1, 2, 3, 4, 0, 44),
.abcdei(0, 1, 2, 3, 4, 45),
.abcdei(4, 0, 1, 2, 3, 46),
.abcdei(3, 4, 0, 1, 2, 47),
.abcdei(2, 3, 4, 0, 1, 48),
.abcdei(1, 2, 3, 4, 0, 49),
.abcdei(0, 1, 2, 3, 4, 50),
.abcdei(4, 0, 1, 2, 3, 51),
.abcdei(3, 4, 0, 1, 2, 52),
.abcdei(2, 3, 4, 0, 1, 53),
.abcdei(1, 2, 3, 4, 0, 54),
.abcdei(0, 1, 2, 3, 4, 55),
.abcdei(4, 0, 1, 2, 3, 56),
.abcdei(3, 4, 0, 1, 2, 57),
.abcdei(2, 3, 4, 0, 1, 58),
.abcdei(1, 2, 3, 4, 0, 59),
};
inline for (round2) |r| {
const t = s[(r.i - 3) & 0xf] ^ s[(r.i - 8) & 0xf] ^ s[(r.i - 14) & 0xf] ^ s[(r.i - 16) & 0xf];
s[r.i & 0xf] = math.rotl(u32, t, @as(u32, 1));
v[r.e] = v[r.e] +% math.rotl(u32, v[r.a], @as(u32, 5)) +% 0x8F1BBCDC +% s[r.i & 0xf] +% ((v[r.b] & v[r.c]) ^ (v[r.b] & v[r.d]) ^ (v[r.c] & v[r.d]));
v[r.b] = math.rotl(u32, v[r.b], @as(u32, 30));
}
const round3 = comptime [_]RoundParam{
.abcdei(0, 1, 2, 3, 4, 60),
.abcdei(4, 0, 1, 2, 3, 61),
.abcdei(3, 4, 0, 1, 2, 62),
.abcdei(2, 3, 4, 0, 1, 63),
.abcdei(1, 2, 3, 4, 0, 64),
.abcdei(0, 1, 2, 3, 4, 65),
.abcdei(4, 0, 1, 2, 3, 66),
.abcdei(3, 4, 0, 1, 2, 67),
.abcdei(2, 3, 4, 0, 1, 68),
.abcdei(1, 2, 3, 4, 0, 69),
.abcdei(0, 1, 2, 3, 4, 70),
.abcdei(4, 0, 1, 2, 3, 71),
.abcdei(3, 4, 0, 1, 2, 72),
.abcdei(2, 3, 4, 0, 1, 73),
.abcdei(1, 2, 3, 4, 0, 74),
.abcdei(0, 1, 2, 3, 4, 75),
.abcdei(4, 0, 1, 2, 3, 76),
.abcdei(3, 4, 0, 1, 2, 77),
.abcdei(2, 3, 4, 0, 1, 78),
.abcdei(1, 2, 3, 4, 0, 79),
};
inline for (round3) |r| {
const t = s[(r.i - 3) & 0xf] ^ s[(r.i - 8) & 0xf] ^ s[(r.i - 14) & 0xf] ^ s[(r.i - 16) & 0xf];
s[r.i & 0xf] = math.rotl(u32, t, @as(u32, 1));
v[r.e] = v[r.e] +% math.rotl(u32, v[r.a], @as(u32, 5)) +% 0xCA62C1D6 +% s[r.i & 0xf] +% (v[r.b] ^ v[r.c] ^ v[r.d]);
v[r.b] = math.rotl(u32, v[r.b], @as(u32, 30));
}
d.s[0] +%= v[0];
d.s[1] +%= v[1];
d.s[2] +%= v[2];
d.s[3] +%= v[3];
d.s[4] +%= v[4];
}
