384 lines
15 KiB
Zig
384 lines
15 KiB
Zig
// Siphash
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//
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// SipHash is a moderately fast, non-cryptographic keyed hash function designed for resistance
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// against hash flooding DoS attacks.
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//
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// https://131002.net/siphash/
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const std = @import("../std.zig");
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const assert = std.debug.assert;
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const testing = std.testing;
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const math = std.math;
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const mem = std.mem;
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const Endian = @import("builtin").Endian;
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pub fn SipHash64(comptime c_rounds: usize, comptime d_rounds: usize) type {
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return SipHash(u64, c_rounds, d_rounds);
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}
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pub fn SipHash128(comptime c_rounds: usize, comptime d_rounds: usize) type {
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return SipHash(u128, c_rounds, d_rounds);
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}
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fn SipHashStateless(comptime T: type, comptime c_rounds: usize, comptime d_rounds: usize) type {
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assert(T == u64 or T == u128);
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assert(c_rounds > 0 and d_rounds > 0);
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return struct {
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const Self = @This();
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const digest_size = 64;
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const block_size = 64;
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v0: u64,
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v1: u64,
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v2: u64,
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v3: u64,
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msg_len: u8,
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pub fn init(key: []const u8) Self {
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assert(key.len >= 16);
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const k0 = mem.readIntSliceLittle(u64, key[0..8]);
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const k1 = mem.readIntSliceLittle(u64, key[8..16]);
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var d = Self{
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.v0 = k0 ^ 0x736f6d6570736575,
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.v1 = k1 ^ 0x646f72616e646f6d,
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.v2 = k0 ^ 0x6c7967656e657261,
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.v3 = k1 ^ 0x7465646279746573,
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.msg_len = 0,
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};
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if (T == u128) {
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d.v1 ^= 0xee;
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}
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return d;
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}
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pub fn update(self: *Self, b: []const u8) void {
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std.debug.assert(b.len % 8 == 0);
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var off: usize = 0;
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while (off < b.len) : (off += 8) {
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@inlineCall(self.round, b[off .. off + 8]);
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}
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self.msg_len +%= @truncate(u8, b.len);
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}
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pub fn final(self: *Self, b: []const u8) T {
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std.debug.assert(b.len < 8);
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self.msg_len +%= @truncate(u8, b.len);
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var buf = [_]u8{0} ** 8;
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mem.copy(u8, buf[0..], b[0..]);
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buf[7] = self.msg_len;
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self.round(buf[0..]);
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if (T == u128) {
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self.v2 ^= 0xee;
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} else {
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self.v2 ^= 0xff;
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}
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comptime var i: usize = 0;
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inline while (i < d_rounds) : (i += 1) {
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@inlineCall(sipRound, self);
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}
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const b1 = self.v0 ^ self.v1 ^ self.v2 ^ self.v3;
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if (T == u64) {
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return b1;
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}
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self.v1 ^= 0xdd;
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comptime var j: usize = 0;
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inline while (j < d_rounds) : (j += 1) {
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@inlineCall(sipRound, self);
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}
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const b2 = self.v0 ^ self.v1 ^ self.v2 ^ self.v3;
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return (u128(b2) << 64) | b1;
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}
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fn round(self: *Self, b: []const u8) void {
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assert(b.len == 8);
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const m = mem.readIntSliceLittle(u64, b[0..]);
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self.v3 ^= m;
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comptime var i: usize = 0;
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inline while (i < c_rounds) : (i += 1) {
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@inlineCall(sipRound, self);
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}
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self.v0 ^= m;
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}
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fn sipRound(d: *Self) void {
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d.v0 +%= d.v1;
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d.v1 = math.rotl(u64, d.v1, u64(13));
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d.v1 ^= d.v0;
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d.v0 = math.rotl(u64, d.v0, u64(32));
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d.v2 +%= d.v3;
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d.v3 = math.rotl(u64, d.v3, u64(16));
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d.v3 ^= d.v2;
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d.v0 +%= d.v3;
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d.v3 = math.rotl(u64, d.v3, u64(21));
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d.v3 ^= d.v0;
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d.v2 +%= d.v1;
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d.v1 = math.rotl(u64, d.v1, u64(17));
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d.v1 ^= d.v2;
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d.v2 = math.rotl(u64, d.v2, u64(32));
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}
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pub fn hash(key: []const u8, input: []const u8) T {
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const aligned_len = input.len - (input.len % 8);
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var c = Self.init(key);
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@inlineCall(c.update, input[0..aligned_len]);
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return @inlineCall(c.final, input[aligned_len..]);
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}
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};
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}
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pub fn SipHash(comptime T: type, comptime c_rounds: usize, comptime d_rounds: usize) type {
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assert(T == u64 or T == u128);
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assert(c_rounds > 0 and d_rounds > 0);
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return struct {
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const State = SipHashStateless(T, c_rounds, d_rounds);
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const Self = @This();
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const digest_size = 64;
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const block_size = 64;
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state: State,
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buf: [8]u8,
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buf_len: usize,
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pub fn init(key: []const u8) Self {
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return Self{
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.state = State.init(key),
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.buf = undefined,
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.buf_len = 0,
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};
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}
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pub fn update(self: *Self, b: []const u8) void {
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var off: usize = 0;
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if (self.buf_len != 0 and self.buf_len + b.len >= 8) {
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off += 8 - self.buf_len;
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mem.copy(u8, self.buf[self.buf_len..], b[0..off]);
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self.state.update(self.buf[0..]);
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self.buf_len = 0;
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}
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const remain_len = b.len - off;
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const aligned_len = remain_len - (remain_len % 8);
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self.state.update(b[off .. off + aligned_len]);
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mem.copy(u8, self.buf[self.buf_len..], b[off + aligned_len ..]);
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self.buf_len += @intCast(u8, b[off + aligned_len ..].len);
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}
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pub fn final(self: *Self) T {
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return self.state.final(self.buf[0..self.buf_len]);
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}
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pub fn hash(key: []const u8, input: []const u8) T {
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return State.hash(key, input);
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}
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};
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}
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// Test vectors from reference implementation.
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// https://github.com/veorq/SipHash/blob/master/vectors.h
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const test_key = "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f";
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test "siphash64-2-4 sanity" {
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const vectors = [_][8]u8{
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"\x31\x0e\x0e\xdd\x47\xdb\x6f\x72", // ""
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"\xfd\x67\xdc\x93\xc5\x39\xf8\x74", // "\x00"
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"\x5a\x4f\xa9\xd9\x09\x80\x6c\x0d", // "\x00\x01" ... etc
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"\x2d\x7e\xfb\xd7\x96\x66\x67\x85",
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"\xb7\x87\x71\x27\xe0\x94\x27\xcf",
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"\x8d\xa6\x99\xcd\x64\x55\x76\x18",
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"\xce\xe3\xfe\x58\x6e\x46\xc9\xcb",
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"\x37\xd1\x01\x8b\xf5\x00\x02\xab",
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"\x62\x24\x93\x9a\x79\xf5\xf5\x93",
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"\xb0\xe4\xa9\x0b\xdf\x82\x00\x9e",
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"\xf3\xb9\xdd\x94\xc5\xbb\x5d\x7a",
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"\xa7\xad\x6b\x22\x46\x2f\xb3\xf4",
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"\xfb\xe5\x0e\x86\xbc\x8f\x1e\x75",
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"\x90\x3d\x84\xc0\x27\x56\xea\x14",
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"\xee\xf2\x7a\x8e\x90\xca\x23\xf7",
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"\xe5\x45\xbe\x49\x61\xca\x29\xa1",
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"\xdb\x9b\xc2\x57\x7f\xcc\x2a\x3f",
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"\x94\x47\xbe\x2c\xf5\xe9\x9a\x69",
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"\x9c\xd3\x8d\x96\xf0\xb3\xc1\x4b",
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"\xbd\x61\x79\xa7\x1d\xc9\x6d\xbb",
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"\x98\xee\xa2\x1a\xf2\x5c\xd6\xbe",
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"\xc7\x67\x3b\x2e\xb0\xcb\xf2\xd0",
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"\x88\x3e\xa3\xe3\x95\x67\x53\x93",
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"\xc8\xce\x5c\xcd\x8c\x03\x0c\xa8",
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"\x94\xaf\x49\xf6\xc6\x50\xad\xb8",
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"\xea\xb8\x85\x8a\xde\x92\xe1\xbc",
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"\xf3\x15\xbb\x5b\xb8\x35\xd8\x17",
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"\xad\xcf\x6b\x07\x63\x61\x2e\x2f",
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"\xa5\xc9\x1d\xa7\xac\xaa\x4d\xde",
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"\x71\x65\x95\x87\x66\x50\xa2\xa6",
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"\x28\xef\x49\x5c\x53\xa3\x87\xad",
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"\x42\xc3\x41\xd8\xfa\x92\xd8\x32",
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"\xce\x7c\xf2\x72\x2f\x51\x27\x71",
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"\xe3\x78\x59\xf9\x46\x23\xf3\xa7",
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"\x38\x12\x05\xbb\x1a\xb0\xe0\x12",
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"\xae\x97\xa1\x0f\xd4\x34\xe0\x15",
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"\xb4\xa3\x15\x08\xbe\xff\x4d\x31",
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"\x81\x39\x62\x29\xf0\x90\x79\x02",
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"\x4d\x0c\xf4\x9e\xe5\xd4\xdc\xca",
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"\x5c\x73\x33\x6a\x76\xd8\xbf\x9a",
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"\xd0\xa7\x04\x53\x6b\xa9\x3e\x0e",
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"\x92\x59\x58\xfc\xd6\x42\x0c\xad",
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"\xa9\x15\xc2\x9b\xc8\x06\x73\x18",
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"\x95\x2b\x79\xf3\xbc\x0a\xa6\xd4",
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"\xf2\x1d\xf2\xe4\x1d\x45\x35\xf9",
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"\x87\x57\x75\x19\x04\x8f\x53\xa9",
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"\x10\xa5\x6c\xf5\xdf\xcd\x9a\xdb",
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"\xeb\x75\x09\x5c\xcd\x98\x6c\xd0",
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"\x51\xa9\xcb\x9e\xcb\xa3\x12\xe6",
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"\x96\xaf\xad\xfc\x2c\xe6\x66\xc7",
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"\x72\xfe\x52\x97\x5a\x43\x64\xee",
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"\x5a\x16\x45\xb2\x76\xd5\x92\xa1",
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"\xb2\x74\xcb\x8e\xbf\x87\x87\x0a",
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"\x6f\x9b\xb4\x20\x3d\xe7\xb3\x81",
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"\xea\xec\xb2\xa3\x0b\x22\xa8\x7f",
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"\x99\x24\xa4\x3c\xc1\x31\x57\x24",
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"\xbd\x83\x8d\x3a\xaf\xbf\x8d\xb7",
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"\x0b\x1a\x2a\x32\x65\xd5\x1a\xea",
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"\x13\x50\x79\xa3\x23\x1c\xe6\x60",
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"\x93\x2b\x28\x46\xe4\xd7\x06\x66",
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"\xe1\x91\x5f\x5c\xb1\xec\xa4\x6c",
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"\xf3\x25\x96\x5c\xa1\x6d\x62\x9f",
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"\x57\x5f\xf2\x8e\x60\x38\x1b\xe5",
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"\x72\x45\x06\xeb\x4c\x32\x8a\x95",
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};
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const siphash = SipHash64(2, 4);
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var buffer: [64]u8 = undefined;
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for (vectors) |vector, i| {
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buffer[i] = @intCast(u8, i);
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const expected = mem.readIntLittle(u64, &vector);
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testing.expectEqual(siphash.hash(test_key, buffer[0..i]), expected);
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}
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}
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test "siphash128-2-4 sanity" {
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const vectors = [_][16]u8{
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"\xa3\x81\x7f\x04\xba\x25\xa8\xe6\x6d\xf6\x72\x14\xc7\x55\x02\x93",
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"\xda\x87\xc1\xd8\x6b\x99\xaf\x44\x34\x76\x59\x11\x9b\x22\xfc\x45",
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"\x81\x77\x22\x8d\xa4\xa4\x5d\xc7\xfc\xa3\x8b\xde\xf6\x0a\xff\xe4",
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"\x9c\x70\xb6\x0c\x52\x67\xa9\x4e\x5f\x33\xb6\xb0\x29\x85\xed\x51",
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"\xf8\x81\x64\xc1\x2d\x9c\x8f\xaf\x7d\x0f\x6e\x7c\x7b\xcd\x55\x79",
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"\x13\x68\x87\x59\x80\x77\x6f\x88\x54\x52\x7a\x07\x69\x0e\x96\x27",
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"\x14\xee\xca\x33\x8b\x20\x86\x13\x48\x5e\xa0\x30\x8f\xd7\xa1\x5e",
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"\xa1\xf1\xeb\xbe\xd8\xdb\xc1\x53\xc0\xb8\x4a\xa6\x1f\xf0\x82\x39",
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"\x3b\x62\xa9\xba\x62\x58\xf5\x61\x0f\x83\xe2\x64\xf3\x14\x97\xb4",
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"\x26\x44\x99\x06\x0a\xd9\xba\xab\xc4\x7f\x8b\x02\xbb\x6d\x71\xed",
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"\x00\x11\x0d\xc3\x78\x14\x69\x56\xc9\x54\x47\xd3\xf3\xd0\xfb\xba",
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"\x01\x51\xc5\x68\x38\x6b\x66\x77\xa2\xb4\xdc\x6f\x81\xe5\xdc\x18",
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"\xd6\x26\xb2\x66\x90\x5e\xf3\x58\x82\x63\x4d\xf6\x85\x32\xc1\x25",
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"\x98\x69\xe2\x47\xe9\xc0\x8b\x10\xd0\x29\x93\x4f\xc4\xb9\x52\xf7",
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"\x31\xfc\xef\xac\x66\xd7\xde\x9c\x7e\xc7\x48\x5f\xe4\x49\x49\x02",
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"\x54\x93\xe9\x99\x33\xb0\xa8\x11\x7e\x08\xec\x0f\x97\xcf\xc3\xd9",
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"\x6e\xe2\xa4\xca\x67\xb0\x54\xbb\xfd\x33\x15\xbf\x85\x23\x05\x77",
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"\x47\x3d\x06\xe8\x73\x8d\xb8\x98\x54\xc0\x66\xc4\x7a\xe4\x77\x40",
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"\xa4\x26\xe5\xe4\x23\xbf\x48\x85\x29\x4d\xa4\x81\xfe\xae\xf7\x23",
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"\x78\x01\x77\x31\xcf\x65\xfa\xb0\x74\xd5\x20\x89\x52\x51\x2e\xb1",
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"\x9e\x25\xfc\x83\x3f\x22\x90\x73\x3e\x93\x44\xa5\xe8\x38\x39\xeb",
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"\x56\x8e\x49\x5a\xbe\x52\x5a\x21\x8a\x22\x14\xcd\x3e\x07\x1d\x12",
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"\x4a\x29\xb5\x45\x52\xd1\x6b\x9a\x46\x9c\x10\x52\x8e\xff\x0a\xae",
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"\xc9\xd1\x84\xdd\xd5\xa9\xf5\xe0\xcf\x8c\xe2\x9a\x9a\xbf\x69\x1c",
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"\x2d\xb4\x79\xae\x78\xbd\x50\xd8\x88\x2a\x8a\x17\x8a\x61\x32\xad",
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"\x8e\xce\x5f\x04\x2d\x5e\x44\x7b\x50\x51\xb9\xea\xcb\x8d\x8f\x6f",
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"\x9c\x0b\x53\xb4\xb3\xc3\x07\xe8\x7e\xae\xe0\x86\x78\x14\x1f\x66",
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"\xab\xf2\x48\xaf\x69\xa6\xea\xe4\xbf\xd3\xeb\x2f\x12\x9e\xeb\x94",
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"\x06\x64\xda\x16\x68\x57\x4b\x88\xb9\x35\xf3\x02\x73\x58\xae\xf4",
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"\xaa\x4b\x9d\xc4\xbf\x33\x7d\xe9\x0c\xd4\xfd\x3c\x46\x7c\x6a\xb7",
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"\xea\x5c\x7f\x47\x1f\xaf\x6b\xde\x2b\x1a\xd7\xd4\x68\x6d\x22\x87",
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"\x29\x39\xb0\x18\x32\x23\xfa\xfc\x17\x23\xde\x4f\x52\xc4\x3d\x35",
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"\x7c\x39\x56\xca\x5e\xea\xfc\x3e\x36\x3e\x9d\x55\x65\x46\xeb\x68",
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"\x77\xc6\x07\x71\x46\xf0\x1c\x32\xb6\xb6\x9d\x5f\x4e\xa9\xff\xcf",
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"\x37\xa6\x98\x6c\xb8\x84\x7e\xdf\x09\x25\xf0\xf1\x30\x9b\x54\xde",
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"\xa7\x05\xf0\xe6\x9d\xa9\xa8\xf9\x07\x24\x1a\x2e\x92\x3c\x8c\xc8",
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"\x3d\xc4\x7d\x1f\x29\xc4\x48\x46\x1e\x9e\x76\xed\x90\x4f\x67\x11",
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"\x0d\x62\xbf\x01\xe6\xfc\x0e\x1a\x0d\x3c\x47\x51\xc5\xd3\x69\x2b",
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"\x8c\x03\x46\x8b\xca\x7c\x66\x9e\xe4\xfd\x5e\x08\x4b\xbe\xe7\xb5",
|
|
"\x52\x8a\x5b\xb9\x3b\xaf\x2c\x9c\x44\x73\xcc\xe5\xd0\xd2\x2b\xd9",
|
|
"\xdf\x6a\x30\x1e\x95\xc9\x5d\xad\x97\xae\x0c\xc8\xc6\x91\x3b\xd8",
|
|
"\x80\x11\x89\x90\x2c\x85\x7f\x39\xe7\x35\x91\x28\x5e\x70\xb6\xdb",
|
|
"\xe6\x17\x34\x6a\xc9\xc2\x31\xbb\x36\x50\xae\x34\xcc\xca\x0c\x5b",
|
|
"\x27\xd9\x34\x37\xef\xb7\x21\xaa\x40\x18\x21\xdc\xec\x5a\xdf\x89",
|
|
"\x89\x23\x7d\x9d\xed\x9c\x5e\x78\xd8\xb1\xc9\xb1\x66\xcc\x73\x42",
|
|
"\x4a\x6d\x80\x91\xbf\x5e\x7d\x65\x11\x89\xfa\x94\xa2\x50\xb1\x4c",
|
|
"\x0e\x33\xf9\x60\x55\xe7\xae\x89\x3f\xfc\x0e\x3d\xcf\x49\x29\x02",
|
|
"\xe6\x1c\x43\x2b\x72\x0b\x19\xd1\x8e\xc8\xd8\x4b\xdc\x63\x15\x1b",
|
|
"\xf7\xe5\xae\xf5\x49\xf7\x82\xcf\x37\x90\x55\xa6\x08\x26\x9b\x16",
|
|
"\x43\x8d\x03\x0f\xd0\xb7\xa5\x4f\xa8\x37\xf2\xad\x20\x1a\x64\x03",
|
|
"\xa5\x90\xd3\xee\x4f\xbf\x04\xe3\x24\x7e\x0d\x27\xf2\x86\x42\x3f",
|
|
"\x5f\xe2\xc1\xa1\x72\xfe\x93\xc4\xb1\x5c\xd3\x7c\xae\xf9\xf5\x38",
|
|
"\x2c\x97\x32\x5c\xbd\x06\xb3\x6e\xb2\x13\x3d\xd0\x8b\x3a\x01\x7c",
|
|
"\x92\xc8\x14\x22\x7a\x6b\xca\x94\x9f\xf0\x65\x9f\x00\x2a\xd3\x9e",
|
|
"\xdc\xe8\x50\x11\x0b\xd8\x32\x8c\xfb\xd5\x08\x41\xd6\x91\x1d\x87",
|
|
"\x67\xf1\x49\x84\xc7\xda\x79\x12\x48\xe3\x2b\xb5\x92\x25\x83\xda",
|
|
"\x19\x38\xf2\xcf\x72\xd5\x4e\xe9\x7e\x94\x16\x6f\xa9\x1d\x2a\x36",
|
|
"\x74\x48\x1e\x96\x46\xed\x49\xfe\x0f\x62\x24\x30\x16\x04\x69\x8e",
|
|
"\x57\xfc\xa5\xde\x98\xa9\xd6\xd8\x00\x64\x38\xd0\x58\x3d\x8a\x1d",
|
|
"\x9f\xec\xde\x1c\xef\xdc\x1c\xbe\xd4\x76\x36\x74\xd9\x57\x53\x59",
|
|
"\xe3\x04\x0c\x00\xeb\x28\xf1\x53\x66\xca\x73\xcb\xd8\x72\xe7\x40",
|
|
"\x76\x97\x00\x9a\x6a\x83\x1d\xfe\xcc\xa9\x1c\x59\x93\x67\x0f\x7a",
|
|
"\x58\x53\x54\x23\x21\xf5\x67\xa0\x05\xd5\x47\xa4\xf0\x47\x59\xbd",
|
|
"\x51\x50\xd1\x77\x2f\x50\x83\x4a\x50\x3e\x06\x9a\x97\x3f\xbd\x7c",
|
|
};
|
|
|
|
const siphash = SipHash128(2, 4);
|
|
|
|
var buffer: [64]u8 = undefined;
|
|
for (vectors) |vector, i| {
|
|
buffer[i] = @intCast(u8, i);
|
|
|
|
const expected = mem.readIntLittle(u128, &vector);
|
|
testing.expectEqual(siphash.hash(test_key, buffer[0..i]), expected);
|
|
}
|
|
}
|
|
|
|
test "iterative non-divisible update" {
|
|
var buf: [1024]u8 = undefined;
|
|
for (buf) |*e, i| {
|
|
e.* = @truncate(u8, i);
|
|
}
|
|
|
|
const key = "0x128dad08f12307";
|
|
const Siphash = SipHash64(2, 4);
|
|
|
|
var end: usize = 9;
|
|
while (end < buf.len) : (end += 9) {
|
|
const non_iterative_hash = Siphash.hash(key, buf[0..end]);
|
|
|
|
var wy = Siphash.init(key);
|
|
var i: usize = 0;
|
|
while (i < end) : (i += 7) {
|
|
wy.update(buf[i..std.math.min(i + 7, end)]);
|
|
}
|
|
const iterative_hash = wy.final();
|
|
|
|
std.testing.expectEqual(iterative_hash, non_iterative_hash);
|
|
}
|
|
}
|