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Implemented X25519 generateKeys and fromEd25519 functions

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Gu://em_ 2026-07-20 00:09:47 +02:00
parent 856f4f626b
commit 547a515952
1 changed files with 31 additions and 5 deletions
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36
src/crypto/x25519.zig
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@ -1,13 +1,39 @@
//TODO
// Errors
const CryptoError = @import("../crypto.zig").CryptoError;
// Constants and default implementation
const X25519 = @import("std").crypto.dh.X25519;
const Ed25519 = @import("std").crypto.sign.Ed25519;
// Random number generation
const rngProvider = @import("random.zig").Implementation;
const X25519 = @import("std").std.crypto.dh.X25519;
pub const secret_key_length: comptime_int = X25519.secret_length;
pub const public_key_length: comptime_int = X25519.public_length;
pub const seed_length: comptime_int = X25519.seed_length;
pub const Implementation = struct {
generateKeys: *const fn (pubkey_buffer: ?*[public_key_length]u8, privkey_buffer: *[secret_key_length]u8, rng: rngProvider) CryptoError!void,
fromEd25519: *const fn (ed25519_keypair: *Ed25519.Keypair, x25519_keypair: *X25519.KeyPair, rng: rngProvider) CryptoError!void,
// TODO
// maybe switch to a Keypair system based on the stdlib implementation
// generateKeys: *const fn (keypair: *X25519.KeyPair, rng: rngProvider) CryptoError!void,
};
fn generateKeys (pubkey_buffer: ?*[public_key_length]u8, privkey_buffer: *[secret_key_length]u8, rng: rngProvider) !void {
var seed_buffer: [seed_length]u8 = undefined;
rng.generate(&seed_buffer);
const keypair: X25519.KeyPair = X25519.KeyPair.generateDeterministic(seed_buffer) catch return CryptoError.FailedKeyGeneration;
if (pubkey_buffer != null) @memcpy(pubkey_buffer.?[0..public_key_length], &keypair.public_key.bytes);
@memcpy(privkey_buffer[0..secret_key_length], &keypair.secret_key.bytes);
}
fn fromEd25519 (ed25519_keypair: *Ed25519.Keypair, x25519_keypair: *X25519.KeyPair) CryptoError!void {
x25519_keypair.* = X25519.KeyPair.fromEd25519(ed25519_keypair);
}
pub const defaultImplementation: Implementation = .{
// One problem, it uses the zig's io module, which is not supported yet as it depends on the target OS
// It may need a custom implementation or some other library
.generateKeys = generateKeys,
.fromEd25519 = fromEd25519,
};