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const std = @import("../std.zig");
const crypto = std.crypto;
const debug = std.debug;
const mem = std.mem;
pub const HmacMd5 = Hmac(crypto.Md5);
pub const HmacSha1 = Hmac(crypto.Sha1);
pub const HmacSha256 = Hmac(crypto.Sha256);
pub const HmacBlake2s256 = Hmac(crypto.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]);
ctx.hash.reset();
ctx.hash.update(ctx.o_key_pad[0..]);
ctx.hash.update(ctx.scratch[0..mac_length]);
ctx.hash.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: [HmacSha256.mac_length]u8 = undefined;
HmacSha256.create(out[0..], "", "");
htest.assertEqual("b613679a0814d9ec772f95d778c35fc5ff1697c493715653c6c712144292c5ad", out[0..]);
HmacSha256.create(out[0..], "The quick brown fox jumps over the lazy dog", "key");
htest.assertEqual("f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8", out[0..]);
}
|
