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zig/lib/std/crypto/x25519.zig

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// Translated from monocypher which is licensed under CC-0/BSD-3.
//
// https://monocypher.org/
const std = @import("../std.zig");
const builtin = @import("builtin");
const fmt = std.fmt;
const Endian = builtin.Endian;
const readIntSliceLittle = std.mem.readIntSliceLittle;
const writeIntSliceLittle = std.mem.writeIntSliceLittle;
// Based on Supercop's ref10 implementation.
pub const X25519 = struct {
pub const secret_length = 32;
pub const minimum_key_length = 32;
fn trimScalar(s: []u8) void {
s[0] &= 248;
s[31] &= 127;
s[31] |= 64;
}
fn scalarBit(s: []const u8, i: usize) i32 {
return (s[i >> 3] >> @intCast(u3, i & 7)) & 1;
}
pub fn create(out: []u8, private_key: []const u8, public_key: []const u8) bool {
std.debug.assert(out.len >= secret_length);
std.debug.assert(private_key.len >= minimum_key_length);
std.debug.assert(public_key.len >= minimum_key_length);
var storage: [7]Fe = undefined;
var x1 = &storage[0];
var x2 = &storage[1];
var z2 = &storage[2];
var x3 = &storage[3];
var z3 = &storage[4];
var t0 = &storage[5];
var t1 = &storage[6];
// computes the scalar product
Fe.fromBytes(x1, public_key);
// restrict the possible scalar values
var e: [32]u8 = undefined;
for (e[0..]) |_, i| {
e[i] = private_key[i];
}
trimScalar(e[0..]);
// computes the actual scalar product (the result is in x2 and z2)
// Montgomery ladder
// In projective coordinates, to avoid divisions: x = X / Z
// We don't care about the y coordinate, it's only 1 bit of information
Fe.init1(x2);
Fe.init0(z2); // "zero" point
Fe.copy(x3, x1);
Fe.init1(z3);
var swap: i32 = 0;
var pos: isize = 254;
while (pos >= 0) : (pos -= 1) {
// constant time conditional swap before ladder step
const b = scalarBit(&e, @intCast(usize, pos));
swap ^= b; // xor trick avoids swapping at the end of the loop
Fe.cswap(x2, x3, swap);
Fe.cswap(z2, z3, swap);
swap = b; // anticipates one last swap after the loop
// Montgomery ladder step: replaces (P2, P3) by (P2*2, P2+P3)
// with differential addition
Fe.sub(t0, x3, z3);
Fe.sub(t1, x2, z2);
Fe.add(x2, x2, z2);
Fe.add(z2, x3, z3);
Fe.mul(z3, t0, x2);
Fe.mul(z2, z2, t1);
Fe.sq(t0, t1);
Fe.sq(t1, x2);
Fe.add(x3, z3, z2);
Fe.sub(z2, z3, z2);
Fe.mul(x2, t1, t0);
Fe.sub(t1, t1, t0);
Fe.sq(z2, z2);
Fe.mulSmall(z3, t1, 121666);
Fe.sq(x3, x3);
Fe.add(t0, t0, z3);
Fe.mul(z3, x1, z2);
Fe.mul(z2, t1, t0);
}
// last swap is necessary to compensate for the xor trick
// Note: after this swap, P3 == P2 + P1.
Fe.cswap(x2, x3, swap);
Fe.cswap(z2, z3, swap);
// normalises the coordinates: x == X / Z
Fe.invert(z2, z2);
Fe.mul(x2, x2, z2);
Fe.toBytes(out, x2);
x1.secureZero();
x2.secureZero();
x3.secureZero();
t0.secureZero();
t1.secureZero();
z2.secureZero();
z3.secureZero();
std.mem.secureZero(u8, e[0..]);
// Returns false if the output is all zero
// (happens with some malicious public keys)
return !zerocmp(u8, out);
}
pub fn createPublicKey(public_key: []u8, private_key: []const u8) bool {
var base_point = [_]u8{9} ++ [_]u8{0} ** 31;
return create(public_key, private_key, &base_point);
}
};
// Constant time compare to zero.
fn zerocmp(comptime T: type, a: []const T) bool {
var s: T = 0;
for (a) |b| {
s |= b;
}
return s == 0;
}
////////////////////////////////////
/// Arithmetic modulo 2^255 - 19 ///
////////////////////////////////////
// Taken from Supercop's ref10 implementation.
// A bit bigger than TweetNaCl, over 4 times faster.
// field element
const Fe = struct {
b: [10]i32,
fn secureZero(self: *Fe) void {
std.mem.secureZero(u8, @ptrCast([*]u8, self)[0..@sizeOf(Fe)]);
}
fn init0(h: *Fe) void {
for (h.b) |*e| {
e.* = 0;
}
}
fn init1(h: *Fe) void {
for (h.b[1..]) |*e| {
e.* = 0;
}
h.b[0] = 1;
}
fn copy(h: *Fe, f: *const Fe) void {
for (h.b) |_, i| {
h.b[i] = f.b[i];
}
}
fn neg(h: *Fe, f: *const Fe) void {
for (h.b) |_, i| {
h.b[i] = -f.b[i];
}
}
fn add(h: *Fe, f: *const Fe, g: *const Fe) void {
for (h.b) |_, i| {
h.b[i] = f.b[i] + g.b[i];
}
}
fn sub(h: *Fe, f: *const Fe, g: *const Fe) void {
for (h.b) |_, i| {
h.b[i] = f.b[i] - g.b[i];
}
}
fn cswap(f: *Fe, g: *Fe, b: i32) void {
for (f.b) |_, i| {
const x = (f.b[i] ^ g.b[i]) & -b;
f.b[i] ^= x;
g.b[i] ^= x;
}
}
fn ccopy(f: *Fe, g: *const Fe, b: i32) void {
for (f.b) |_, i| {
const x = (f.b[i] ^ g.b[i]) & -b;
f.b[i] ^= x;
}
}
inline fn carryRound(c: []i64, t: []i64, comptime i: comptime_int, comptime shift: comptime_int, comptime mult: comptime_int) void {
const j = (i + 1) % 10;
c[i] = (t[i] + (@as(i64, 1) << shift)) >> (shift + 1);
t[j] += c[i] * mult;
t[i] -= c[i] * (@as(i64, 1) << (shift + 1));
}
fn carry1(h: *Fe, t: []i64) void {
var c: [10]i64 = undefined;
var sc = c[0..];
var st = t[0..];
carryRound(sc, st, 9, 24, 19);
carryRound(sc, st, 1, 24, 1);
carryRound(sc, st, 3, 24, 1);
carryRound(sc, st, 5, 24, 1);
carryRound(sc, st, 7, 24, 1);
carryRound(sc, st, 0, 25, 1);
carryRound(sc, st, 2, 25, 1);
carryRound(sc, st, 4, 25, 1);
carryRound(sc, st, 6, 25, 1);
carryRound(sc, st, 8, 25, 1);
for (h.b) |_, i| {
h.b[i] = @intCast(i32, t[i]);
}
}
fn carry2(h: *Fe, t: []i64) void {
var c: [10]i64 = undefined;
var sc = c[0..];
var st = t[0..];
carryRound(sc, st, 0, 25, 1);
carryRound(sc, st, 4, 25, 1);
carryRound(sc, st, 1, 24, 1);
carryRound(sc, st, 5, 24, 1);
carryRound(sc, st, 2, 25, 1);
carryRound(sc, st, 6, 25, 1);
carryRound(sc, st, 3, 24, 1);
carryRound(sc, st, 7, 24, 1);
carryRound(sc, st, 4, 25, 1);
carryRound(sc, st, 8, 25, 1);
carryRound(sc, st, 9, 24, 19);
carryRound(sc, st, 0, 25, 1);
for (h.b) |_, i| {
h.b[i] = @intCast(i32, t[i]);
}
}
fn fromBytes(h: *Fe, s: []const u8) void {
std.debug.assert(s.len >= 32);
var t: [10]i64 = undefined;
t[0] = readIntSliceLittle(u32, s[0..4]);
t[1] = @as(u32, readIntSliceLittle(u24, s[4..7])) << 6;
t[2] = @as(u32, readIntSliceLittle(u24, s[7..10])) << 5;
t[3] = @as(u32, readIntSliceLittle(u24, s[10..13])) << 3;
t[4] = @as(u32, readIntSliceLittle(u24, s[13..16])) << 2;
t[5] = readIntSliceLittle(u32, s[16..20]);
t[6] = @as(u32, readIntSliceLittle(u24, s[20..23])) << 7;
t[7] = @as(u32, readIntSliceLittle(u24, s[23..26])) << 5;
t[8] = @as(u32, readIntSliceLittle(u24, s[26..29])) << 4;
t[9] = (@as(u32, readIntSliceLittle(u24, s[29..32])) & 0x7fffff) << 2;
carry1(h, t[0..]);
}
fn mulSmall(h: *Fe, f: *const Fe, comptime g: comptime_int) void {
var t: [10]i64 = undefined;
for (t[0..]) |_, i| {
t[i] = @as(i64, f.b[i]) * g;
}
carry1(h, t[0..]);
}
fn mul(h: *Fe, f1: *const Fe, g1: *const Fe) void {
const f = f1.b;
const g = g1.b;
var F: [10]i32 = undefined;
var G: [10]i32 = undefined;
F[1] = f[1] * 2;
F[3] = f[3] * 2;
F[5] = f[5] * 2;
F[7] = f[7] * 2;
F[9] = f[9] * 2;
G[1] = g[1] * 19;
G[2] = g[2] * 19;
G[3] = g[3] * 19;
G[4] = g[4] * 19;
G[5] = g[5] * 19;
G[6] = g[6] * 19;
G[7] = g[7] * 19;
G[8] = g[8] * 19;
G[9] = g[9] * 19;
// t's become h
var t: [10]i64 = undefined;
t[0] = f[0] * @as(i64, g[0]) + F[1] * @as(i64, G[9]) + f[2] * @as(i64, G[8]) + F[3] * @as(i64, G[7]) + f[4] * @as(i64, G[6]) + F[5] * @as(i64, G[5]) + f[6] * @as(i64, G[4]) + F[7] * @as(i64, G[3]) + f[8] * @as(i64, G[2]) + F[9] * @as(i64, G[1]);
t[1] = f[0] * @as(i64, g[1]) + f[1] * @as(i64, g[0]) + f[2] * @as(i64, G[9]) + f[3] * @as(i64, G[8]) + f[4] * @as(i64, G[7]) + f[5] * @as(i64, G[6]) + f[6] * @as(i64, G[5]) + f[7] * @as(i64, G[4]) + f[8] * @as(i64, G[3]) + f[9] * @as(i64, G[2]);
t[2] = f[0] * @as(i64, g[2]) + F[1] * @as(i64, g[1]) + f[2] * @as(i64, g[0]) + F[3] * @as(i64, G[9]) + f[4] * @as(i64, G[8]) + F[5] * @as(i64, G[7]) + f[6] * @as(i64, G[6]) + F[7] * @as(i64, G[5]) + f[8] * @as(i64, G[4]) + F[9] * @as(i64, G[3]);
t[3] = f[0] * @as(i64, g[3]) + f[1] * @as(i64, g[2]) + f[2] * @as(i64, g[1]) + f[3] * @as(i64, g[0]) + f[4] * @as(i64, G[9]) + f[5] * @as(i64, G[8]) + f[6] * @as(i64, G[7]) + f[7] * @as(i64, G[6]) + f[8] * @as(i64, G[5]) + f[9] * @as(i64, G[4]);
t[4] = f[0] * @as(i64, g[4]) + F[1] * @as(i64, g[3]) + f[2] * @as(i64, g[2]) + F[3] * @as(i64, g[1]) + f[4] * @as(i64, g[0]) + F[5] * @as(i64, G[9]) + f[6] * @as(i64, G[8]) + F[7] * @as(i64, G[7]) + f[8] * @as(i64, G[6]) + F[9] * @as(i64, G[5]);
t[5] = f[0] * @as(i64, g[5]) + f[1] * @as(i64, g[4]) + f[2] * @as(i64, g[3]) + f[3] * @as(i64, g[2]) + f[4] * @as(i64, g[1]) + f[5] * @as(i64, g[0]) + f[6] * @as(i64, G[9]) + f[7] * @as(i64, G[8]) + f[8] * @as(i64, G[7]) + f[9] * @as(i64, G[6]);
t[6] = f[0] * @as(i64, g[6]) + F[1] * @as(i64, g[5]) + f[2] * @as(i64, g[4]) + F[3] * @as(i64, g[3]) + f[4] * @as(i64, g[2]) + F[5] * @as(i64, g[1]) + f[6] * @as(i64, g[0]) + F[7] * @as(i64, G[9]) + f[8] * @as(i64, G[8]) + F[9] * @as(i64, G[7]);
t[7] = f[0] * @as(i64, g[7]) + f[1] * @as(i64, g[6]) + f[2] * @as(i64, g[5]) + f[3] * @as(i64, g[4]) + f[4] * @as(i64, g[3]) + f[5] * @as(i64, g[2]) + f[6] * @as(i64, g[1]) + f[7] * @as(i64, g[0]) + f[8] * @as(i64, G[9]) + f[9] * @as(i64, G[8]);
t[8] = f[0] * @as(i64, g[8]) + F[1] * @as(i64, g[7]) + f[2] * @as(i64, g[6]) + F[3] * @as(i64, g[5]) + f[4] * @as(i64, g[4]) + F[5] * @as(i64, g[3]) + f[6] * @as(i64, g[2]) + F[7] * @as(i64, g[1]) + f[8] * @as(i64, g[0]) + F[9] * @as(i64, G[9]);
t[9] = f[0] * @as(i64, g[9]) + f[1] * @as(i64, g[8]) + f[2] * @as(i64, g[7]) + f[3] * @as(i64, g[6]) + f[4] * @as(i64, g[5]) + f[5] * @as(i64, g[4]) + f[6] * @as(i64, g[3]) + f[7] * @as(i64, g[2]) + f[8] * @as(i64, g[1]) + f[9] * @as(i64, g[0]);
carry2(h, t[0..]);
}
// we could use Fe.mul() for this, but this is significantly faster
fn sq(h: *Fe, fz: *const Fe) void {
const f0 = fz.b[0];
const f1 = fz.b[1];
const f2 = fz.b[2];
const f3 = fz.b[3];
const f4 = fz.b[4];
const f5 = fz.b[5];
const f6 = fz.b[6];
const f7 = fz.b[7];
const f8 = fz.b[8];
const f9 = fz.b[9];
const f0_2 = f0 * 2;
const f1_2 = f1 * 2;
const f2_2 = f2 * 2;
const f3_2 = f3 * 2;
const f4_2 = f4 * 2;
const f5_2 = f5 * 2;
const f6_2 = f6 * 2;
const f7_2 = f7 * 2;
const f5_38 = f5 * 38;
const f6_19 = f6 * 19;
const f7_38 = f7 * 38;
const f8_19 = f8 * 19;
const f9_38 = f9 * 38;
var t: [10]i64 = undefined;
t[0] = f0 * @as(i64, f0) + f1_2 * @as(i64, f9_38) + f2_2 * @as(i64, f8_19) + f3_2 * @as(i64, f7_38) + f4_2 * @as(i64, f6_19) + f5 * @as(i64, f5_38);
t[1] = f0_2 * @as(i64, f1) + f2 * @as(i64, f9_38) + f3_2 * @as(i64, f8_19) + f4 * @as(i64, f7_38) + f5_2 * @as(i64, f6_19);
t[2] = f0_2 * @as(i64, f2) + f1_2 * @as(i64, f1) + f3_2 * @as(i64, f9_38) + f4_2 * @as(i64, f8_19) + f5_2 * @as(i64, f7_38) + f6 * @as(i64, f6_19);
t[3] = f0_2 * @as(i64, f3) + f1_2 * @as(i64, f2) + f4 * @as(i64, f9_38) + f5_2 * @as(i64, f8_19) + f6 * @as(i64, f7_38);
t[4] = f0_2 * @as(i64, f4) + f1_2 * @as(i64, f3_2) + f2 * @as(i64, f2) + f5_2 * @as(i64, f9_38) + f6_2 * @as(i64, f8_19) + f7 * @as(i64, f7_38);
t[5] = f0_2 * @as(i64, f5) + f1_2 * @as(i64, f4) + f2_2 * @as(i64, f3) + f6 * @as(i64, f9_38) + f7_2 * @as(i64, f8_19);
t[6] = f0_2 * @as(i64, f6) + f1_2 * @as(i64, f5_2) + f2_2 * @as(i64, f4) + f3_2 * @as(i64, f3) + f7_2 * @as(i64, f9_38) + f8 * @as(i64, f8_19);
t[7] = f0_2 * @as(i64, f7) + f1_2 * @as(i64, f6) + f2_2 * @as(i64, f5) + f3_2 * @as(i64, f4) + f8 * @as(i64, f9_38);
t[8] = f0_2 * @as(i64, f8) + f1_2 * @as(i64, f7_2) + f2_2 * @as(i64, f6) + f3_2 * @as(i64, f5_2) + f4 * @as(i64, f4) + f9 * @as(i64, f9_38);
t[9] = f0_2 * @as(i64, f9) + f1_2 * @as(i64, f8) + f2_2 * @as(i64, f7) + f3_2 * @as(i64, f6) + f4 * @as(i64, f5_2);
carry2(h, t[0..]);
}
fn sq2(h: *Fe, f: *const Fe) void {
Fe.sq(h, f);
Fe.mul_small(h, h, 2);
}
// This could be simplified, but it would be slower
fn invert(out: *Fe, z: *const Fe) void {
var i: usize = undefined;
var t: [4]Fe = undefined;
var t0 = &t[0];
var t1 = &t[1];
var t2 = &t[2];
var t3 = &t[3];
Fe.sq(t0, z);
Fe.sq(t1, t0);
Fe.sq(t1, t1);
Fe.mul(t1, z, t1);
Fe.mul(t0, t0, t1);
Fe.sq(t2, t0);
Fe.mul(t1, t1, t2);
Fe.sq(t2, t1);
i = 1;
while (i < 5) : (i += 1) Fe.sq(t2, t2);
Fe.mul(t1, t2, t1);
Fe.sq(t2, t1);
i = 1;
while (i < 10) : (i += 1) Fe.sq(t2, t2);
Fe.mul(t2, t2, t1);
Fe.sq(t3, t2);
i = 1;
while (i < 20) : (i += 1) Fe.sq(t3, t3);
Fe.mul(t2, t3, t2);
Fe.sq(t2, t2);
i = 1;
while (i < 10) : (i += 1) Fe.sq(t2, t2);
Fe.mul(t1, t2, t1);
Fe.sq(t2, t1);
i = 1;
while (i < 50) : (i += 1) Fe.sq(t2, t2);
Fe.mul(t2, t2, t1);
Fe.sq(t3, t2);
i = 1;
while (i < 100) : (i += 1) Fe.sq(t3, t3);
Fe.mul(t2, t3, t2);
Fe.sq(t2, t2);
i = 1;
while (i < 50) : (i += 1) Fe.sq(t2, t2);
Fe.mul(t1, t2, t1);
Fe.sq(t1, t1);
i = 1;
while (i < 5) : (i += 1) Fe.sq(t1, t1);
Fe.mul(out, t1, t0);
t0.secureZero();
t1.secureZero();
t2.secureZero();
t3.secureZero();
}
// This could be simplified, but it would be slower
fn pow22523(out: *Fe, z: *const Fe) void {
var i: usize = undefined;
var t: [3]Fe = undefined;
var t0 = &t[0];
var t1 = &t[1];
var t2 = &t[2];
Fe.sq(t0, z);
Fe.sq(t1, t0);
Fe.sq(t1, t1);
Fe.mul(t1, z, t1);
Fe.mul(t0, t0, t1);
Fe.sq(t0, t0);
Fe.mul(t0, t1, t0);
Fe.sq(t1, t0);
i = 1;
while (i < 5) : (i += 1) Fe.sq(t1, t1);
Fe.mul(t0, t1, t0);
Fe.sq(t1, t0);
i = 1;
while (i < 10) : (i += 1) Fe.sq(t1, t1);
Fe.mul(t1, t1, t0);
Fe.sq(t2, t1);
i = 1;
while (i < 20) : (i += 1) Fe.sq(t2, t2);
Fe.mul(t1, t2, t1);
Fe.sq(t1, t1);
i = 1;
while (i < 10) : (i += 1) Fe.sq(t1, t1);
Fe.mul(t0, t1, t0);
Fe.sq(t1, t0);
i = 1;
while (i < 50) : (i += 1) Fe.sq(t1, t1);
Fe.mul(t1, t1, t0);
Fe.sq(t2, t1);
i = 1;
while (i < 100) : (i += 1) Fe.sq(t2, t2);
Fe.mul(t1, t2, t1);
Fe.sq(t1, t1);
i = 1;
while (i < 50) : (i += 1) Fe.sq(t1, t1);
Fe.mul(t0, t1, t0);
Fe.sq(t0, t0);
i = 1;
while (i < 2) : (i += 1) Fe.sq(t0, t0);
Fe.mul(out, t0, z);
t0.secureZero();
t1.secureZero();
t2.secureZero();
}
inline fn toBytesRound(c: []i64, t: []i64, comptime i: comptime_int, comptime shift: comptime_int) void {
c[i] = t[i] >> shift;
if (i + 1 < 10) {
t[i + 1] += c[i];
}
t[i] -= c[i] * (@as(i32, 1) << shift);
}
fn toBytes(s: []u8, h: *const Fe) void {
std.debug.assert(s.len >= 32);
var t: [10]i64 = undefined;
for (h.b[0..]) |_, i| {
t[i] = h.b[i];
}
var q = (19 * t[9] + ((@as(i32, 1) << 24))) >> 25;
{
var i: usize = 0;
while (i < 5) : (i += 1) {
q += t[2 * i];
q >>= 26;
q += t[2 * i + 1];
q >>= 25;
}
}
t[0] += 19 * q;
var c: [10]i64 = undefined;
var st = t[0..];
var sc = c[0..];
toBytesRound(sc, st, 0, 26);
toBytesRound(sc, st, 1, 25);
toBytesRound(sc, st, 2, 26);
toBytesRound(sc, st, 3, 25);
toBytesRound(sc, st, 4, 26);
toBytesRound(sc, st, 5, 25);
toBytesRound(sc, st, 6, 26);
toBytesRound(sc, st, 7, 25);
toBytesRound(sc, st, 8, 26);
toBytesRound(sc, st, 9, 25);
var ut: [10]u32 = undefined;
for (ut[0..]) |_, i| {
ut[i] = @bitCast(u32, @intCast(i32, t[i]));
}
// TODO https://github.com/ziglang/zig/issues/863
writeIntSliceLittle(u32, s[0..4], (ut[0] >> 0) | (ut[1] << 26));
writeIntSliceLittle(u32, s[4..8], (ut[1] >> 6) | (ut[2] << 19));
writeIntSliceLittle(u32, s[8..12], (ut[2] >> 13) | (ut[3] << 13));
writeIntSliceLittle(u32, s[12..16], (ut[3] >> 19) | (ut[4] << 6));
writeIntSliceLittle(u32, s[16..20], (ut[5] >> 0) | (ut[6] << 25));
writeIntSliceLittle(u32, s[20..24], (ut[6] >> 7) | (ut[7] << 19));
writeIntSliceLittle(u32, s[24..28], (ut[7] >> 13) | (ut[8] << 12));
writeIntSliceLittle(u32, s[28..], (ut[8] >> 20) | (ut[9] << 6));
std.mem.secureZero(i64, t[0..]);
}
// Parity check. Returns 0 if even, 1 if odd
fn isNegative(f: *const Fe) bool {
var s: [32]u8 = undefined;
Fe.toBytes(s[0..], f);
const isneg = s[0] & 1;
s.secureZero();
return isneg;
}
fn isNonZero(f: *const Fe) bool {
var s: [32]u8 = undefined;
Fe.toBytes(s[0..], f);
const isnonzero = zerocmp(u8, s[0..]);
s.secureZero();
return isneg;
}
};
test "x25519 public key calculation from secret key" {
var sk: [32]u8 = undefined;
var pk_expected: [32]u8 = undefined;
var pk_calculated: [32]u8 = undefined;
try fmt.hexToBytes(sk[0..], "8052030376d47112be7f73ed7a019293dd12ad910b654455798b4667d73de166");
try fmt.hexToBytes(pk_expected[0..], "f1814f0e8ff1043d8a44d25babff3cedcae6c22c3edaa48f857ae70de2baae50");
std.testing.expect(X25519.createPublicKey(pk_calculated[0..], &sk));
std.testing.expect(std.mem.eql(u8, &pk_calculated, &pk_expected));
}
test "x25519 rfc7748 vector1" {
const secret_key = "\xa5\x46\xe3\x6b\xf0\x52\x7c\x9d\x3b\x16\x15\x4b\x82\x46\x5e\xdd\x62\x14\x4c\x0a\xc1\xfc\x5a\x18\x50\x6a\x22\x44\xba\x44\x9a\xc4";
const public_key = "\xe6\xdb\x68\x67\x58\x30\x30\xdb\x35\x94\xc1\xa4\x24\xb1\x5f\x7c\x72\x66\x24\xec\x26\xb3\x35\x3b\x10\xa9\x03\xa6\xd0\xab\x1c\x4c";
const expected_output = "\xc3\xda\x55\x37\x9d\xe9\xc6\x90\x8e\x94\xea\x4d\xf2\x8d\x08\x4f\x32\xec\xcf\x03\x49\x1c\x71\xf7\x54\xb4\x07\x55\x77\xa2\x85\x52";
var output: [32]u8 = undefined;
std.testing.expect(X25519.create(output[0..], secret_key, public_key));
std.testing.expect(std.mem.eql(u8, &output, expected_output));
}
test "x25519 rfc7748 vector2" {
const secret_key = "\x4b\x66\xe9\xd4\xd1\xb4\x67\x3c\x5a\xd2\x26\x91\x95\x7d\x6a\xf5\xc1\x1b\x64\x21\xe0\xea\x01\xd4\x2c\xa4\x16\x9e\x79\x18\xba\x0d";
const public_key = "\xe5\x21\x0f\x12\x78\x68\x11\xd3\xf4\xb7\x95\x9d\x05\x38\xae\x2c\x31\xdb\xe7\x10\x6f\xc0\x3c\x3e\xfc\x4c\xd5\x49\xc7\x15\xa4\x93";
const expected_output = "\x95\xcb\xde\x94\x76\xe8\x90\x7d\x7a\xad\xe4\x5c\xb4\xb8\x73\xf8\x8b\x59\x5a\x68\x79\x9f\xa1\x52\xe6\xf8\xf7\x64\x7a\xac\x79\x57";
var output: [32]u8 = undefined;
std.testing.expect(X25519.create(output[0..], secret_key, public_key));
std.testing.expect(std.mem.eql(u8, &output, expected_output));
}
test "x25519 rfc7748 one iteration" {
const initial_value = "\x09\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".*;
const expected_output = "\x42\x2c\x8e\x7a\x62\x27\xd7\xbc\xa1\x35\x0b\x3e\x2b\xb7\x27\x9f\x78\x97\xb8\x7b\xb6\x85\x4b\x78\x3c\x60\xe8\x03\x11\xae\x30\x79";
var k: [32]u8 = initial_value;
var u: [32]u8 = initial_value;
var i: usize = 0;
while (i < 1) : (i += 1) {
var output: [32]u8 = undefined;
std.testing.expect(X25519.create(output[0..], &k, &u));
std.mem.copy(u8, u[0..], k[0..]);
std.mem.copy(u8, k[0..], output[0..]);
}
std.testing.expect(std.mem.eql(u8, k[0..], expected_output));
}
test "x25519 rfc7748 1,000 iterations" {
// These iteration tests are slow so we always skip them. Results have been verified.
if (true) {
return error.SkipZigTest;
}
const initial_value = "\x09\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
const expected_output = "\x68\x4c\xf5\x9b\xa8\x33\x09\x55\x28\x00\xef\x56\x6f\x2f\x4d\x3c\x1c\x38\x87\xc4\x93\x60\xe3\x87\x5f\x2e\xb9\x4d\x99\x53\x2c\x51";
var k: [32]u8 = initial_value.*;
var u: [32]u8 = initial_value.*;
var i: usize = 0;
while (i < 1000) : (i += 1) {
var output: [32]u8 = undefined;
std.testing.expect(X25519.create(output[0..], &k, &u));
std.mem.copy(u8, u[0..], k[0..]);
std.mem.copy(u8, k[0..], output[0..]);
}
std.testing.expect(std.mem.eql(u8, k[0..], expected_output));
}
test "x25519 rfc7748 1,000,000 iterations" {
if (true) {
return error.SkipZigTest;
}
const initial_value = "\x09\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
const expected_output = "\x7c\x39\x11\xe0\xab\x25\x86\xfd\x86\x44\x97\x29\x7e\x57\x5e\x6f\x3b\xc6\x01\xc0\x88\x3c\x30\xdf\x5f\x4d\xd2\xd2\x4f\x66\x54\x24";
var k: [32]u8 = initial_value.*;
var u: [32]u8 = initial_value.*;
var i: usize = 0;
while (i < 1000000) : (i += 1) {
var output: [32]u8 = undefined;
std.testing.expect(X25519.create(output[0..], &k, &u));
std.mem.copy(u8, u[0..], k[0..]);
std.mem.copy(u8, k[0..], output[0..]);
}
std.testing.expect(std.mem.eql(u8, k[0..], expected_output));
}
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