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Implemented Hkdf and Hmac and added a digest length property to all of them to get closer to the zig stdlib implementation

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This commit is contained in:
Gu://em_ 2026-07-08 01:00:39 +02:00
parent 1b98394fe4
commit 150c5b2e38
3 changed files with 37 additions and 13 deletions
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22
src/crypto/hkdf.zig
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@ -1,9 +1,29 @@
pub const Implementation = struct {
prk_length: comptime_int,
expand: *const fn (out: []u8, ctx: []const u8, prk: *[Implementation.prk_length]u8) void,
extract: *const fn (out: *[Implementation.prk_length]u8, salt: []const u8, ikm: []const u8) void,
};
pub const defaultImplementation = struct {
const Hkdf = @import("std").crypto.kdf.hkdf.Hkdf;
const Sha256 = @import("std").crypto.hash.sha2.Sha256;
const HashImpl = Sha256;
const HmacImpl = @import("std").crypto.auth.hmac.Hmac(HashImpl);
const Hkdf = @import("std").crypto.kdf.hkdf.Hkdf(HmacImpl);
pub const prk_length = Hkdf.prk_length;
pub fn expand(out: []u8, ctx: []const u8, prk: *[prk_length]u8) void {
Hkdf.expand(out, ctx, prk);
}
pub fn extract(out: *[prk_length]u8, salt: []const u8, ikm: []const u8) void {
out *= Hkdf.extract(salt, ikm);
}
};

17
src/crypto/hmac.zig
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@ -1,15 +1,20 @@
pub const Implementation = struct {
mac_length: comptime_int,
create: *const fn (out: *[Implementation.mac_length]u8, msg: []const u8, key: []const u8) void,
};
pub const defaultImplementation = struct {
const Hmac = @import("std").crypto.auth.hmac.Hmac;
const Sha256 = @import("std").crypto.hash.sha2.Sha256;
pub fn create(out: []u8, msg: []const u8, key: []const u8) !void {
_ = out;
_ = msg;
_ = key;
return error.NotImplemented;
const HashImpl = Sha256;
const Hmac = @import("std").crypto.auth.hmac.Hmac(Sha256);
pub const mac_length = Hmac.mac_length;
pub fn create(out: *[mac_length]u8, msg: []const u8, key: []const u8) void {
Hmac.create(out, msg, key);
}
};

11
src/crypto/sha256.zig
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@ -1,18 +1,17 @@
pub const Implementation = struct {
hash: *const fn (buffer: []const u8, out: []u8) void,
hash_length: comptime_int,
hash: *const fn (buffer: []const u8, out: *[Implementation.hash_length]u8) void,
};
pub const defaultImplementation = struct {
const Sha256 = @import("std").crypto.hash.sha2.Sha256;
const HASH_LEN = 32; // In bytes
pub const hash_len = Sha256.digest_length;
pub fn hash(buffer: []const u8, out: []u8) !void {
if (out.len < HASH_LEN) {
return error.BufferTooShort;
}
pub fn hash(buffer: []const u8, out: *[hash_len]u8) !void {
Sha256.hash(buffer, out, .{});
}
};