fc55cd458a
- This avoids having multiple `init()` functions for every combination of optional parameters - The API is consistent across all hash functions - New options can be added later without breaking existing applications. For example, this is going to come in handy if we implement parallelization for BLAKE2 and BLAKE3. - We don't have a mix of snake_case and camelCase functions any more, at least in the public crypto API Support for BLAKE2 salt and personalization (more commonly called context) parameters have been implemented by the way to illustrate this.
114 lines
3.9 KiB
Zig
114 lines
3.9 KiB
Zig
// SPDX-License-Identifier: MIT
|
|
// Copyright (c) 2015-2020 Zig Contributors
|
|
// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
|
|
// The MIT license requires this copyright notice to be included in all copies
|
|
// and substantial portions of the software.
|
|
const std = @import("../std.zig");
|
|
const crypto = std.crypto;
|
|
const debug = std.debug;
|
|
const mem = std.mem;
|
|
|
|
pub const HmacMd5 = Hmac(crypto.hash.Md5);
|
|
pub const HmacSha1 = Hmac(crypto.hash.Sha1);
|
|
|
|
pub const sha2 = struct {
|
|
pub const HmacSha224 = Hmac(crypto.hash.sha2.Sha224);
|
|
pub const HmacSha256 = Hmac(crypto.hash.sha2.Sha256);
|
|
pub const HmacSha384 = Hmac(crypto.hash.sha2.Sha384);
|
|
pub const HmacSha512 = Hmac(crypto.hash.sha2.Sha512);
|
|
};
|
|
|
|
pub const blake2 = struct {
|
|
pub const HmacBlake2s256 = Hmac(crypto.hash.blake2.Blake2s256);
|
|
};
|
|
|
|
pub fn Hmac(comptime Hash: type) type {
|
|
return struct {
|
|
const Self = @This();
|
|
pub const mac_length = Hash.digest_length;
|
|
pub const minimum_key_length = 0;
|
|
|
|
o_key_pad: [Hash.block_length]u8,
|
|
i_key_pad: [Hash.block_length]u8,
|
|
scratch: [Hash.block_length]u8,
|
|
hash: Hash,
|
|
|
|
// HMAC(k, m) = H(o_key_pad | H(i_key_pad | msg)) where | is concatenation
|
|
pub fn create(out: []u8, msg: []const u8, key: []const u8) void {
|
|
var ctx = Self.init(key);
|
|
ctx.update(msg);
|
|
ctx.final(out[0..]);
|
|
}
|
|
|
|
pub fn init(key: []const u8) Self {
|
|
var ctx: Self = undefined;
|
|
|
|
// Normalize key length to block size of hash
|
|
if (key.len > Hash.block_length) {
|
|
Hash.hash(key, ctx.scratch[0..mac_length], .{});
|
|
mem.set(u8, ctx.scratch[mac_length..Hash.block_length], 0);
|
|
} else if (key.len < Hash.block_length) {
|
|
mem.copy(u8, ctx.scratch[0..key.len], key);
|
|
mem.set(u8, ctx.scratch[key.len..Hash.block_length], 0);
|
|
} else {
|
|
mem.copy(u8, ctx.scratch[0..], key);
|
|
}
|
|
|
|
for (ctx.o_key_pad) |*b, i| {
|
|
b.* = ctx.scratch[i] ^ 0x5c;
|
|
}
|
|
|
|
for (ctx.i_key_pad) |*b, i| {
|
|
b.* = ctx.scratch[i] ^ 0x36;
|
|
}
|
|
|
|
ctx.hash = Hash.init(.{});
|
|
ctx.hash.update(ctx.i_key_pad[0..]);
|
|
return ctx;
|
|
}
|
|
|
|
pub fn update(ctx: *Self, msg: []const u8) void {
|
|
ctx.hash.update(msg);
|
|
}
|
|
|
|
pub fn final(ctx: *Self, out: []u8) void {
|
|
debug.assert(Hash.block_length >= out.len and out.len >= mac_length);
|
|
|
|
ctx.hash.final(ctx.scratch[0..mac_length]);
|
|
var ohash = Hash.init(.{});
|
|
ohash.update(ctx.o_key_pad[0..]);
|
|
ohash.update(ctx.scratch[0..mac_length]);
|
|
ohash.final(out[0..mac_length]);
|
|
}
|
|
};
|
|
}
|
|
|
|
const htest = @import("test.zig");
|
|
|
|
test "hmac md5" {
|
|
var out: [HmacMd5.mac_length]u8 = undefined;
|
|
HmacMd5.create(out[0..], "", "");
|
|
htest.assertEqual("74e6f7298a9c2d168935f58c001bad88", out[0..]);
|
|
|
|
HmacMd5.create(out[0..], "The quick brown fox jumps over the lazy dog", "key");
|
|
htest.assertEqual("80070713463e7749b90c2dc24911e275", out[0..]);
|
|
}
|
|
|
|
test "hmac sha1" {
|
|
var out: [HmacSha1.mac_length]u8 = undefined;
|
|
HmacSha1.create(out[0..], "", "");
|
|
htest.assertEqual("fbdb1d1b18aa6c08324b7d64b71fb76370690e1d", out[0..]);
|
|
|
|
HmacSha1.create(out[0..], "The quick brown fox jumps over the lazy dog", "key");
|
|
htest.assertEqual("de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9", out[0..]);
|
|
}
|
|
|
|
test "hmac sha256" {
|
|
var out: [sha2.HmacSha256.mac_length]u8 = undefined;
|
|
sha2.HmacSha256.create(out[0..], "", "");
|
|
htest.assertEqual("b613679a0814d9ec772f95d778c35fc5ff1697c493715653c6c712144292c5ad", out[0..]);
|
|
|
|
sha2.HmacSha256.create(out[0..], "The quick brown fox jumps over the lazy dog", "key");
|
|
htest.assertEqual("f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8", out[0..]);
|
|
}
|